![Al Viro](/assets/img/avatar_default.png)
parallel to mutex_{lock,unlock,trylock,is_locked,lock_nested}, inode_foo(inode) being mutex_foo(&inode->i_mutex). Please, use those for access to ->i_mutex; over the coming cycle ->i_mutex will become rwsem, with ->lookup() done with it held only shared. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
3767 lines
101 KiB
C
3767 lines
101 KiB
C
#include <linux/ceph/ceph_debug.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
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#include <linux/writeback.h>
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#include "super.h"
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#include "mds_client.h"
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#include "cache.h"
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#include <linux/ceph/decode.h>
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#include <linux/ceph/messenger.h>
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/*
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* Capability management
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*
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* The Ceph metadata servers control client access to inode metadata
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* and file data by issuing capabilities, granting clients permission
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* to read and/or write both inode field and file data to OSDs
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* (storage nodes). Each capability consists of a set of bits
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* indicating which operations are allowed.
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*
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* If the client holds a *_SHARED cap, the client has a coherent value
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* that can be safely read from the cached inode.
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*
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* In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
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* client is allowed to change inode attributes (e.g., file size,
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* mtime), note its dirty state in the ceph_cap, and asynchronously
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* flush that metadata change to the MDS.
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*
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* In the event of a conflicting operation (perhaps by another
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* client), the MDS will revoke the conflicting client capabilities.
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*
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* In order for a client to cache an inode, it must hold a capability
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* with at least one MDS server. When inodes are released, release
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* notifications are batched and periodically sent en masse to the MDS
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* cluster to release server state.
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*/
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/*
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* Generate readable cap strings for debugging output.
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*/
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#define MAX_CAP_STR 20
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static char cap_str[MAX_CAP_STR][40];
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static DEFINE_SPINLOCK(cap_str_lock);
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static int last_cap_str;
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static char *gcap_string(char *s, int c)
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{
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if (c & CEPH_CAP_GSHARED)
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*s++ = 's';
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if (c & CEPH_CAP_GEXCL)
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*s++ = 'x';
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if (c & CEPH_CAP_GCACHE)
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*s++ = 'c';
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if (c & CEPH_CAP_GRD)
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*s++ = 'r';
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if (c & CEPH_CAP_GWR)
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*s++ = 'w';
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if (c & CEPH_CAP_GBUFFER)
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*s++ = 'b';
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if (c & CEPH_CAP_GLAZYIO)
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*s++ = 'l';
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return s;
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}
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const char *ceph_cap_string(int caps)
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{
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int i;
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char *s;
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int c;
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spin_lock(&cap_str_lock);
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i = last_cap_str++;
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if (last_cap_str == MAX_CAP_STR)
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last_cap_str = 0;
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spin_unlock(&cap_str_lock);
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s = cap_str[i];
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if (caps & CEPH_CAP_PIN)
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*s++ = 'p';
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c = (caps >> CEPH_CAP_SAUTH) & 3;
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if (c) {
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*s++ = 'A';
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s = gcap_string(s, c);
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}
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c = (caps >> CEPH_CAP_SLINK) & 3;
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if (c) {
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*s++ = 'L';
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s = gcap_string(s, c);
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}
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c = (caps >> CEPH_CAP_SXATTR) & 3;
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if (c) {
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*s++ = 'X';
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s = gcap_string(s, c);
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}
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c = caps >> CEPH_CAP_SFILE;
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if (c) {
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*s++ = 'F';
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s = gcap_string(s, c);
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}
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if (s == cap_str[i])
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*s++ = '-';
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*s = 0;
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return cap_str[i];
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}
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void ceph_caps_init(struct ceph_mds_client *mdsc)
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{
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INIT_LIST_HEAD(&mdsc->caps_list);
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spin_lock_init(&mdsc->caps_list_lock);
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}
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void ceph_caps_finalize(struct ceph_mds_client *mdsc)
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{
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struct ceph_cap *cap;
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spin_lock(&mdsc->caps_list_lock);
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while (!list_empty(&mdsc->caps_list)) {
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cap = list_first_entry(&mdsc->caps_list,
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struct ceph_cap, caps_item);
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list_del(&cap->caps_item);
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kmem_cache_free(ceph_cap_cachep, cap);
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}
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mdsc->caps_total_count = 0;
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mdsc->caps_avail_count = 0;
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mdsc->caps_use_count = 0;
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mdsc->caps_reserve_count = 0;
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mdsc->caps_min_count = 0;
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spin_unlock(&mdsc->caps_list_lock);
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}
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void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
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{
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spin_lock(&mdsc->caps_list_lock);
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mdsc->caps_min_count += delta;
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BUG_ON(mdsc->caps_min_count < 0);
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spin_unlock(&mdsc->caps_list_lock);
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}
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void ceph_reserve_caps(struct ceph_mds_client *mdsc,
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struct ceph_cap_reservation *ctx, int need)
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{
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int i;
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struct ceph_cap *cap;
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int have;
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int alloc = 0;
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LIST_HEAD(newcaps);
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dout("reserve caps ctx=%p need=%d\n", ctx, need);
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/* first reserve any caps that are already allocated */
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spin_lock(&mdsc->caps_list_lock);
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if (mdsc->caps_avail_count >= need)
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have = need;
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else
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have = mdsc->caps_avail_count;
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mdsc->caps_avail_count -= have;
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mdsc->caps_reserve_count += have;
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count +
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mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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for (i = have; i < need; i++) {
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cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
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if (!cap)
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break;
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list_add(&cap->caps_item, &newcaps);
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alloc++;
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}
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/* we didn't manage to reserve as much as we needed */
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if (have + alloc != need)
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pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
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ctx, need, have + alloc);
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spin_lock(&mdsc->caps_list_lock);
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mdsc->caps_total_count += alloc;
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mdsc->caps_reserve_count += alloc;
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list_splice(&newcaps, &mdsc->caps_list);
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count +
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mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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ctx->count = need;
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dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
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ctx, mdsc->caps_total_count, mdsc->caps_use_count,
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mdsc->caps_reserve_count, mdsc->caps_avail_count);
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}
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int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
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struct ceph_cap_reservation *ctx)
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{
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dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
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if (ctx->count) {
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spin_lock(&mdsc->caps_list_lock);
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BUG_ON(mdsc->caps_reserve_count < ctx->count);
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mdsc->caps_reserve_count -= ctx->count;
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mdsc->caps_avail_count += ctx->count;
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ctx->count = 0;
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dout("unreserve caps %d = %d used + %d resv + %d avail\n",
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mdsc->caps_total_count, mdsc->caps_use_count,
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mdsc->caps_reserve_count, mdsc->caps_avail_count);
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count +
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mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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}
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return 0;
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}
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struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
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struct ceph_cap_reservation *ctx)
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{
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struct ceph_cap *cap = NULL;
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/* temporary, until we do something about cap import/export */
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if (!ctx) {
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cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
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if (cap) {
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spin_lock(&mdsc->caps_list_lock);
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mdsc->caps_use_count++;
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mdsc->caps_total_count++;
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spin_unlock(&mdsc->caps_list_lock);
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}
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return cap;
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}
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spin_lock(&mdsc->caps_list_lock);
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dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
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ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
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mdsc->caps_reserve_count, mdsc->caps_avail_count);
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BUG_ON(!ctx->count);
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BUG_ON(ctx->count > mdsc->caps_reserve_count);
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BUG_ON(list_empty(&mdsc->caps_list));
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ctx->count--;
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mdsc->caps_reserve_count--;
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mdsc->caps_use_count++;
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cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
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list_del(&cap->caps_item);
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count + mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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return cap;
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}
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void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
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{
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spin_lock(&mdsc->caps_list_lock);
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dout("put_cap %p %d = %d used + %d resv + %d avail\n",
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cap, mdsc->caps_total_count, mdsc->caps_use_count,
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mdsc->caps_reserve_count, mdsc->caps_avail_count);
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mdsc->caps_use_count--;
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/*
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* Keep some preallocated caps around (ceph_min_count), to
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* avoid lots of free/alloc churn.
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*/
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if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
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mdsc->caps_min_count) {
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mdsc->caps_total_count--;
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kmem_cache_free(ceph_cap_cachep, cap);
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} else {
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mdsc->caps_avail_count++;
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list_add(&cap->caps_item, &mdsc->caps_list);
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}
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count + mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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}
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void ceph_reservation_status(struct ceph_fs_client *fsc,
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int *total, int *avail, int *used, int *reserved,
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int *min)
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{
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struct ceph_mds_client *mdsc = fsc->mdsc;
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if (total)
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*total = mdsc->caps_total_count;
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if (avail)
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*avail = mdsc->caps_avail_count;
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if (used)
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*used = mdsc->caps_use_count;
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if (reserved)
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*reserved = mdsc->caps_reserve_count;
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if (min)
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*min = mdsc->caps_min_count;
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}
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/*
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* Find ceph_cap for given mds, if any.
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*
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* Called with i_ceph_lock held.
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*/
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static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
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{
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struct ceph_cap *cap;
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struct rb_node *n = ci->i_caps.rb_node;
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while (n) {
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cap = rb_entry(n, struct ceph_cap, ci_node);
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if (mds < cap->mds)
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n = n->rb_left;
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else if (mds > cap->mds)
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n = n->rb_right;
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else
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return cap;
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}
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return NULL;
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}
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struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
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{
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struct ceph_cap *cap;
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spin_lock(&ci->i_ceph_lock);
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cap = __get_cap_for_mds(ci, mds);
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spin_unlock(&ci->i_ceph_lock);
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return cap;
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}
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/*
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* Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
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*/
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static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
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{
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struct ceph_cap *cap;
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int mds = -1;
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struct rb_node *p;
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/* prefer mds with WR|BUFFER|EXCL caps */
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for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
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cap = rb_entry(p, struct ceph_cap, ci_node);
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mds = cap->mds;
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if (cap->issued & (CEPH_CAP_FILE_WR |
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CEPH_CAP_FILE_BUFFER |
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CEPH_CAP_FILE_EXCL))
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break;
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}
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return mds;
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}
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int ceph_get_cap_mds(struct inode *inode)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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int mds;
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spin_lock(&ci->i_ceph_lock);
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mds = __ceph_get_cap_mds(ceph_inode(inode));
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spin_unlock(&ci->i_ceph_lock);
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return mds;
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}
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/*
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* Called under i_ceph_lock.
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*/
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static void __insert_cap_node(struct ceph_inode_info *ci,
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struct ceph_cap *new)
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{
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struct rb_node **p = &ci->i_caps.rb_node;
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struct rb_node *parent = NULL;
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struct ceph_cap *cap = NULL;
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while (*p) {
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parent = *p;
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cap = rb_entry(parent, struct ceph_cap, ci_node);
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if (new->mds < cap->mds)
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p = &(*p)->rb_left;
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else if (new->mds > cap->mds)
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p = &(*p)->rb_right;
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else
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BUG();
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}
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rb_link_node(&new->ci_node, parent, p);
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rb_insert_color(&new->ci_node, &ci->i_caps);
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}
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/*
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* (re)set cap hold timeouts, which control the delayed release
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* of unused caps back to the MDS. Should be called on cap use.
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*/
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static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
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struct ceph_inode_info *ci)
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{
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struct ceph_mount_options *ma = mdsc->fsc->mount_options;
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ci->i_hold_caps_min = round_jiffies(jiffies +
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ma->caps_wanted_delay_min * HZ);
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ci->i_hold_caps_max = round_jiffies(jiffies +
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ma->caps_wanted_delay_max * HZ);
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dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
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ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
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}
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/*
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* (Re)queue cap at the end of the delayed cap release list.
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*
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* If I_FLUSH is set, leave the inode at the front of the list.
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*
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* Caller holds i_ceph_lock
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* -> we take mdsc->cap_delay_lock
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*/
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static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
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struct ceph_inode_info *ci)
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{
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__cap_set_timeouts(mdsc, ci);
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dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
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ci->i_ceph_flags, ci->i_hold_caps_max);
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if (!mdsc->stopping) {
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spin_lock(&mdsc->cap_delay_lock);
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if (!list_empty(&ci->i_cap_delay_list)) {
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if (ci->i_ceph_flags & CEPH_I_FLUSH)
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goto no_change;
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list_del_init(&ci->i_cap_delay_list);
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}
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list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
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no_change:
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spin_unlock(&mdsc->cap_delay_lock);
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}
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}
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/*
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* Queue an inode for immediate writeback. Mark inode with I_FLUSH,
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* indicating we should send a cap message to flush dirty metadata
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* asap, and move to the front of the delayed cap list.
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*/
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static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
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struct ceph_inode_info *ci)
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{
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dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
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spin_lock(&mdsc->cap_delay_lock);
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ci->i_ceph_flags |= CEPH_I_FLUSH;
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if (!list_empty(&ci->i_cap_delay_list))
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list_del_init(&ci->i_cap_delay_list);
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list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
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spin_unlock(&mdsc->cap_delay_lock);
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}
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/*
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* Cancel delayed work on cap.
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*
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* Caller must hold i_ceph_lock.
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*/
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static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
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struct ceph_inode_info *ci)
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{
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dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
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if (list_empty(&ci->i_cap_delay_list))
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return;
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spin_lock(&mdsc->cap_delay_lock);
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list_del_init(&ci->i_cap_delay_list);
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spin_unlock(&mdsc->cap_delay_lock);
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}
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/*
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* Common issue checks for add_cap, handle_cap_grant.
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*/
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static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
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unsigned issued)
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{
|
|
unsigned had = __ceph_caps_issued(ci, NULL);
|
|
|
|
/*
|
|
* Each time we receive FILE_CACHE anew, we increment
|
|
* i_rdcache_gen.
|
|
*/
|
|
if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
|
|
(had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) {
|
|
ci->i_rdcache_gen++;
|
|
}
|
|
|
|
/*
|
|
* if we are newly issued FILE_SHARED, mark dir not complete; we
|
|
* don't know what happened to this directory while we didn't
|
|
* have the cap.
|
|
*/
|
|
if ((issued & CEPH_CAP_FILE_SHARED) &&
|
|
(had & CEPH_CAP_FILE_SHARED) == 0) {
|
|
ci->i_shared_gen++;
|
|
if (S_ISDIR(ci->vfs_inode.i_mode)) {
|
|
dout(" marking %p NOT complete\n", &ci->vfs_inode);
|
|
__ceph_dir_clear_complete(ci);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add a capability under the given MDS session.
|
|
*
|
|
* Caller should hold session snap_rwsem (read) and s_mutex.
|
|
*
|
|
* @fmode is the open file mode, if we are opening a file, otherwise
|
|
* it is < 0. (This is so we can atomically add the cap and add an
|
|
* open file reference to it.)
|
|
*/
|
|
void ceph_add_cap(struct inode *inode,
|
|
struct ceph_mds_session *session, u64 cap_id,
|
|
int fmode, unsigned issued, unsigned wanted,
|
|
unsigned seq, unsigned mseq, u64 realmino, int flags,
|
|
struct ceph_cap **new_cap)
|
|
{
|
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_cap *cap;
|
|
int mds = session->s_mds;
|
|
int actual_wanted;
|
|
|
|
dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
|
|
session->s_mds, cap_id, ceph_cap_string(issued), seq);
|
|
|
|
/*
|
|
* If we are opening the file, include file mode wanted bits
|
|
* in wanted.
|
|
*/
|
|
if (fmode >= 0)
|
|
wanted |= ceph_caps_for_mode(fmode);
|
|
|
|
cap = __get_cap_for_mds(ci, mds);
|
|
if (!cap) {
|
|
cap = *new_cap;
|
|
*new_cap = NULL;
|
|
|
|
cap->issued = 0;
|
|
cap->implemented = 0;
|
|
cap->mds = mds;
|
|
cap->mds_wanted = 0;
|
|
cap->mseq = 0;
|
|
|
|
cap->ci = ci;
|
|
__insert_cap_node(ci, cap);
|
|
|
|
/* add to session cap list */
|
|
cap->session = session;
|
|
spin_lock(&session->s_cap_lock);
|
|
list_add_tail(&cap->session_caps, &session->s_caps);
|
|
session->s_nr_caps++;
|
|
spin_unlock(&session->s_cap_lock);
|
|
} else {
|
|
/*
|
|
* auth mds of the inode changed. we received the cap export
|
|
* message, but still haven't received the cap import message.
|
|
* handle_cap_export() updated the new auth MDS' cap.
|
|
*
|
|
* "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing
|
|
* a message that was send before the cap import message. So
|
|
* don't remove caps.
|
|
*/
|
|
if (ceph_seq_cmp(seq, cap->seq) <= 0) {
|
|
WARN_ON(cap != ci->i_auth_cap);
|
|
WARN_ON(cap->cap_id != cap_id);
|
|
seq = cap->seq;
|
|
mseq = cap->mseq;
|
|
issued |= cap->issued;
|
|
flags |= CEPH_CAP_FLAG_AUTH;
|
|
}
|
|
}
|
|
|
|
if (!ci->i_snap_realm) {
|
|
/*
|
|
* add this inode to the appropriate snap realm
|
|
*/
|
|
struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
|
|
realmino);
|
|
if (realm) {
|
|
spin_lock(&realm->inodes_with_caps_lock);
|
|
ci->i_snap_realm = realm;
|
|
list_add(&ci->i_snap_realm_item,
|
|
&realm->inodes_with_caps);
|
|
spin_unlock(&realm->inodes_with_caps_lock);
|
|
} else {
|
|
pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
|
|
realmino);
|
|
WARN_ON(!realm);
|
|
}
|
|
}
|
|
|
|
__check_cap_issue(ci, cap, issued);
|
|
|
|
/*
|
|
* If we are issued caps we don't want, or the mds' wanted
|
|
* value appears to be off, queue a check so we'll release
|
|
* later and/or update the mds wanted value.
|
|
*/
|
|
actual_wanted = __ceph_caps_wanted(ci);
|
|
if ((wanted & ~actual_wanted) ||
|
|
(issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
|
|
dout(" issued %s, mds wanted %s, actual %s, queueing\n",
|
|
ceph_cap_string(issued), ceph_cap_string(wanted),
|
|
ceph_cap_string(actual_wanted));
|
|
__cap_delay_requeue(mdsc, ci);
|
|
}
|
|
|
|
if (flags & CEPH_CAP_FLAG_AUTH) {
|
|
if (ci->i_auth_cap == NULL ||
|
|
ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) {
|
|
ci->i_auth_cap = cap;
|
|
cap->mds_wanted = wanted;
|
|
}
|
|
} else {
|
|
WARN_ON(ci->i_auth_cap == cap);
|
|
}
|
|
|
|
dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
|
|
inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
|
|
ceph_cap_string(issued|cap->issued), seq, mds);
|
|
cap->cap_id = cap_id;
|
|
cap->issued = issued;
|
|
cap->implemented |= issued;
|
|
if (ceph_seq_cmp(mseq, cap->mseq) > 0)
|
|
cap->mds_wanted = wanted;
|
|
else
|
|
cap->mds_wanted |= wanted;
|
|
cap->seq = seq;
|
|
cap->issue_seq = seq;
|
|
cap->mseq = mseq;
|
|
cap->cap_gen = session->s_cap_gen;
|
|
|
|
if (fmode >= 0)
|
|
__ceph_get_fmode(ci, fmode);
|
|
}
|
|
|
|
/*
|
|
* Return true if cap has not timed out and belongs to the current
|
|
* generation of the MDS session (i.e. has not gone 'stale' due to
|
|
* us losing touch with the mds).
|
|
*/
|
|
static int __cap_is_valid(struct ceph_cap *cap)
|
|
{
|
|
unsigned long ttl;
|
|
u32 gen;
|
|
|
|
spin_lock(&cap->session->s_gen_ttl_lock);
|
|
gen = cap->session->s_cap_gen;
|
|
ttl = cap->session->s_cap_ttl;
|
|
spin_unlock(&cap->session->s_gen_ttl_lock);
|
|
|
|
if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
|
|
dout("__cap_is_valid %p cap %p issued %s "
|
|
"but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
|
|
cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Return set of valid cap bits issued to us. Note that caps time
|
|
* out, and may be invalidated in bulk if the client session times out
|
|
* and session->s_cap_gen is bumped.
|
|
*/
|
|
int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
|
|
{
|
|
int have = ci->i_snap_caps;
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
|
|
if (implemented)
|
|
*implemented = 0;
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
dout("__ceph_caps_issued %p cap %p issued %s\n",
|
|
&ci->vfs_inode, cap, ceph_cap_string(cap->issued));
|
|
have |= cap->issued;
|
|
if (implemented)
|
|
*implemented |= cap->implemented;
|
|
}
|
|
/*
|
|
* exclude caps issued by non-auth MDS, but are been revoking
|
|
* by the auth MDS. The non-auth MDS should be revoking/exporting
|
|
* these caps, but the message is delayed.
|
|
*/
|
|
if (ci->i_auth_cap) {
|
|
cap = ci->i_auth_cap;
|
|
have &= ~cap->implemented | cap->issued;
|
|
}
|
|
return have;
|
|
}
|
|
|
|
/*
|
|
* Get cap bits issued by caps other than @ocap
|
|
*/
|
|
int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
|
|
{
|
|
int have = ci->i_snap_caps;
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (cap == ocap)
|
|
continue;
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
have |= cap->issued;
|
|
}
|
|
return have;
|
|
}
|
|
|
|
/*
|
|
* Move a cap to the end of the LRU (oldest caps at list head, newest
|
|
* at list tail).
|
|
*/
|
|
static void __touch_cap(struct ceph_cap *cap)
|
|
{
|
|
struct ceph_mds_session *s = cap->session;
|
|
|
|
spin_lock(&s->s_cap_lock);
|
|
if (s->s_cap_iterator == NULL) {
|
|
dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
|
|
s->s_mds);
|
|
list_move_tail(&cap->session_caps, &s->s_caps);
|
|
} else {
|
|
dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
|
|
&cap->ci->vfs_inode, cap, s->s_mds);
|
|
}
|
|
spin_unlock(&s->s_cap_lock);
|
|
}
|
|
|
|
/*
|
|
* Check if we hold the given mask. If so, move the cap(s) to the
|
|
* front of their respective LRUs. (This is the preferred way for
|
|
* callers to check for caps they want.)
|
|
*/
|
|
int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
|
|
{
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
int have = ci->i_snap_caps;
|
|
|
|
if ((have & mask) == mask) {
|
|
dout("__ceph_caps_issued_mask %p snap issued %s"
|
|
" (mask %s)\n", &ci->vfs_inode,
|
|
ceph_cap_string(have),
|
|
ceph_cap_string(mask));
|
|
return 1;
|
|
}
|
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
if ((cap->issued & mask) == mask) {
|
|
dout("__ceph_caps_issued_mask %p cap %p issued %s"
|
|
" (mask %s)\n", &ci->vfs_inode, cap,
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(mask));
|
|
if (touch)
|
|
__touch_cap(cap);
|
|
return 1;
|
|
}
|
|
|
|
/* does a combination of caps satisfy mask? */
|
|
have |= cap->issued;
|
|
if ((have & mask) == mask) {
|
|
dout("__ceph_caps_issued_mask %p combo issued %s"
|
|
" (mask %s)\n", &ci->vfs_inode,
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(mask));
|
|
if (touch) {
|
|
struct rb_node *q;
|
|
|
|
/* touch this + preceding caps */
|
|
__touch_cap(cap);
|
|
for (q = rb_first(&ci->i_caps); q != p;
|
|
q = rb_next(q)) {
|
|
cap = rb_entry(q, struct ceph_cap,
|
|
ci_node);
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
__touch_cap(cap);
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return true if mask caps are currently being revoked by an MDS.
|
|
*/
|
|
int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
|
|
struct ceph_cap *ocap, int mask)
|
|
{
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (cap != ocap &&
|
|
(cap->implemented & ~cap->issued & mask))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int ret;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
ret = __ceph_caps_revoking_other(ci, NULL, mask);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
dout("ceph_caps_revoking %p %s = %d\n", inode,
|
|
ceph_cap_string(mask), ret);
|
|
return ret;
|
|
}
|
|
|
|
int __ceph_caps_used(struct ceph_inode_info *ci)
|
|
{
|
|
int used = 0;
|
|
if (ci->i_pin_ref)
|
|
used |= CEPH_CAP_PIN;
|
|
if (ci->i_rd_ref)
|
|
used |= CEPH_CAP_FILE_RD;
|
|
if (ci->i_rdcache_ref ||
|
|
(!S_ISDIR(ci->vfs_inode.i_mode) && /* ignore readdir cache */
|
|
ci->vfs_inode.i_data.nrpages))
|
|
used |= CEPH_CAP_FILE_CACHE;
|
|
if (ci->i_wr_ref)
|
|
used |= CEPH_CAP_FILE_WR;
|
|
if (ci->i_wb_ref || ci->i_wrbuffer_ref)
|
|
used |= CEPH_CAP_FILE_BUFFER;
|
|
return used;
|
|
}
|
|
|
|
/*
|
|
* wanted, by virtue of open file modes
|
|
*/
|
|
int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
|
|
{
|
|
int want = 0;
|
|
int mode;
|
|
for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
|
|
if (ci->i_nr_by_mode[mode])
|
|
want |= ceph_caps_for_mode(mode);
|
|
return want;
|
|
}
|
|
|
|
/*
|
|
* Return caps we have registered with the MDS(s) as 'wanted'.
|
|
*/
|
|
int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
|
|
{
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
int mds_wanted = 0;
|
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
if (cap == ci->i_auth_cap)
|
|
mds_wanted |= cap->mds_wanted;
|
|
else
|
|
mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
|
|
}
|
|
return mds_wanted;
|
|
}
|
|
|
|
/*
|
|
* called under i_ceph_lock
|
|
*/
|
|
static int __ceph_is_any_caps(struct ceph_inode_info *ci)
|
|
{
|
|
return !RB_EMPTY_ROOT(&ci->i_caps);
|
|
}
|
|
|
|
int ceph_is_any_caps(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int ret;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
ret = __ceph_is_any_caps(ci);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void drop_inode_snap_realm(struct ceph_inode_info *ci)
|
|
{
|
|
struct ceph_snap_realm *realm = ci->i_snap_realm;
|
|
spin_lock(&realm->inodes_with_caps_lock);
|
|
list_del_init(&ci->i_snap_realm_item);
|
|
ci->i_snap_realm_counter++;
|
|
ci->i_snap_realm = NULL;
|
|
spin_unlock(&realm->inodes_with_caps_lock);
|
|
ceph_put_snap_realm(ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc,
|
|
realm);
|
|
}
|
|
|
|
/*
|
|
* Remove a cap. Take steps to deal with a racing iterate_session_caps.
|
|
*
|
|
* caller should hold i_ceph_lock.
|
|
* caller will not hold session s_mutex if called from destroy_inode.
|
|
*/
|
|
void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release)
|
|
{
|
|
struct ceph_mds_session *session = cap->session;
|
|
struct ceph_inode_info *ci = cap->ci;
|
|
struct ceph_mds_client *mdsc =
|
|
ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
|
|
int removed = 0;
|
|
|
|
dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
|
|
|
|
/* remove from session list */
|
|
spin_lock(&session->s_cap_lock);
|
|
if (session->s_cap_iterator == cap) {
|
|
/* not yet, we are iterating over this very cap */
|
|
dout("__ceph_remove_cap delaying %p removal from session %p\n",
|
|
cap, cap->session);
|
|
} else {
|
|
list_del_init(&cap->session_caps);
|
|
session->s_nr_caps--;
|
|
cap->session = NULL;
|
|
removed = 1;
|
|
}
|
|
/* protect backpointer with s_cap_lock: see iterate_session_caps */
|
|
cap->ci = NULL;
|
|
|
|
/*
|
|
* s_cap_reconnect is protected by s_cap_lock. no one changes
|
|
* s_cap_gen while session is in the reconnect state.
|
|
*/
|
|
if (queue_release &&
|
|
(!session->s_cap_reconnect || cap->cap_gen == session->s_cap_gen)) {
|
|
cap->queue_release = 1;
|
|
if (removed) {
|
|
list_add_tail(&cap->session_caps,
|
|
&session->s_cap_releases);
|
|
session->s_num_cap_releases++;
|
|
removed = 0;
|
|
}
|
|
} else {
|
|
cap->queue_release = 0;
|
|
}
|
|
cap->cap_ino = ci->i_vino.ino;
|
|
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
/* remove from inode list */
|
|
rb_erase(&cap->ci_node, &ci->i_caps);
|
|
if (ci->i_auth_cap == cap)
|
|
ci->i_auth_cap = NULL;
|
|
|
|
if (removed)
|
|
ceph_put_cap(mdsc, cap);
|
|
|
|
/* when reconnect denied, we remove session caps forcibly,
|
|
* i_wr_ref can be non-zero. If there are ongoing write,
|
|
* keep i_snap_realm.
|
|
*/
|
|
if (!__ceph_is_any_caps(ci) && ci->i_wr_ref == 0 && ci->i_snap_realm)
|
|
drop_inode_snap_realm(ci);
|
|
|
|
if (!__ceph_is_any_real_caps(ci))
|
|
__cap_delay_cancel(mdsc, ci);
|
|
}
|
|
|
|
/*
|
|
* Build and send a cap message to the given MDS.
|
|
*
|
|
* Caller should be holding s_mutex.
|
|
*/
|
|
static int send_cap_msg(struct ceph_mds_session *session,
|
|
u64 ino, u64 cid, int op,
|
|
int caps, int wanted, int dirty,
|
|
u32 seq, u64 flush_tid, u64 oldest_flush_tid,
|
|
u32 issue_seq, u32 mseq, u64 size, u64 max_size,
|
|
struct timespec *mtime, struct timespec *atime,
|
|
u64 time_warp_seq,
|
|
kuid_t uid, kgid_t gid, umode_t mode,
|
|
u64 xattr_version,
|
|
struct ceph_buffer *xattrs_buf,
|
|
u64 follows, bool inline_data)
|
|
{
|
|
struct ceph_mds_caps *fc;
|
|
struct ceph_msg *msg;
|
|
void *p;
|
|
size_t extra_len;
|
|
|
|
dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
|
|
" seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu"
|
|
" xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
|
|
cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
|
|
ceph_cap_string(dirty),
|
|
seq, issue_seq, flush_tid, oldest_flush_tid,
|
|
mseq, follows, size, max_size,
|
|
xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
|
|
|
|
/* flock buffer size + inline version + inline data size +
|
|
* osd_epoch_barrier + oldest_flush_tid */
|
|
extra_len = 4 + 8 + 4 + 4 + 8;
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc) + extra_len,
|
|
GFP_NOFS, false);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
msg->hdr.version = cpu_to_le16(6);
|
|
msg->hdr.tid = cpu_to_le64(flush_tid);
|
|
|
|
fc = msg->front.iov_base;
|
|
memset(fc, 0, sizeof(*fc));
|
|
|
|
fc->cap_id = cpu_to_le64(cid);
|
|
fc->op = cpu_to_le32(op);
|
|
fc->seq = cpu_to_le32(seq);
|
|
fc->issue_seq = cpu_to_le32(issue_seq);
|
|
fc->migrate_seq = cpu_to_le32(mseq);
|
|
fc->caps = cpu_to_le32(caps);
|
|
fc->wanted = cpu_to_le32(wanted);
|
|
fc->dirty = cpu_to_le32(dirty);
|
|
fc->ino = cpu_to_le64(ino);
|
|
fc->snap_follows = cpu_to_le64(follows);
|
|
|
|
fc->size = cpu_to_le64(size);
|
|
fc->max_size = cpu_to_le64(max_size);
|
|
if (mtime)
|
|
ceph_encode_timespec(&fc->mtime, mtime);
|
|
if (atime)
|
|
ceph_encode_timespec(&fc->atime, atime);
|
|
fc->time_warp_seq = cpu_to_le32(time_warp_seq);
|
|
|
|
fc->uid = cpu_to_le32(from_kuid(&init_user_ns, uid));
|
|
fc->gid = cpu_to_le32(from_kgid(&init_user_ns, gid));
|
|
fc->mode = cpu_to_le32(mode);
|
|
|
|
p = fc + 1;
|
|
/* flock buffer size */
|
|
ceph_encode_32(&p, 0);
|
|
/* inline version */
|
|
ceph_encode_64(&p, inline_data ? 0 : CEPH_INLINE_NONE);
|
|
/* inline data size */
|
|
ceph_encode_32(&p, 0);
|
|
/* osd_epoch_barrier */
|
|
ceph_encode_32(&p, 0);
|
|
/* oldest_flush_tid */
|
|
ceph_encode_64(&p, oldest_flush_tid);
|
|
|
|
fc->xattr_version = cpu_to_le64(xattr_version);
|
|
if (xattrs_buf) {
|
|
msg->middle = ceph_buffer_get(xattrs_buf);
|
|
fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
|
|
msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
|
|
}
|
|
|
|
ceph_con_send(&session->s_con, msg);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Queue cap releases when an inode is dropped from our cache. Since
|
|
* inode is about to be destroyed, there is no need for i_ceph_lock.
|
|
*/
|
|
void ceph_queue_caps_release(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct rb_node *p;
|
|
|
|
p = rb_first(&ci->i_caps);
|
|
while (p) {
|
|
struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
p = rb_next(p);
|
|
__ceph_remove_cap(cap, true);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send a cap msg on the given inode. Update our caps state, then
|
|
* drop i_ceph_lock and send the message.
|
|
*
|
|
* Make note of max_size reported/requested from mds, revoked caps
|
|
* that have now been implemented.
|
|
*
|
|
* Make half-hearted attempt ot to invalidate page cache if we are
|
|
* dropping RDCACHE. Note that this will leave behind locked pages
|
|
* that we'll then need to deal with elsewhere.
|
|
*
|
|
* Return non-zero if delayed release, or we experienced an error
|
|
* such that the caller should requeue + retry later.
|
|
*
|
|
* called with i_ceph_lock, then drops it.
|
|
* caller should hold snap_rwsem (read), s_mutex.
|
|
*/
|
|
static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
|
|
int op, int used, int want, int retain, int flushing,
|
|
u64 flush_tid, u64 oldest_flush_tid)
|
|
__releases(cap->ci->i_ceph_lock)
|
|
{
|
|
struct ceph_inode_info *ci = cap->ci;
|
|
struct inode *inode = &ci->vfs_inode;
|
|
u64 cap_id = cap->cap_id;
|
|
int held, revoking, dropping, keep;
|
|
u64 seq, issue_seq, mseq, time_warp_seq, follows;
|
|
u64 size, max_size;
|
|
struct timespec mtime, atime;
|
|
int wake = 0;
|
|
umode_t mode;
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
struct ceph_mds_session *session;
|
|
u64 xattr_version = 0;
|
|
struct ceph_buffer *xattr_blob = NULL;
|
|
int delayed = 0;
|
|
int ret;
|
|
bool inline_data;
|
|
|
|
held = cap->issued | cap->implemented;
|
|
revoking = cap->implemented & ~cap->issued;
|
|
retain &= ~revoking;
|
|
dropping = cap->issued & ~retain;
|
|
|
|
dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
|
|
inode, cap, cap->session,
|
|
ceph_cap_string(held), ceph_cap_string(held & retain),
|
|
ceph_cap_string(revoking));
|
|
BUG_ON((retain & CEPH_CAP_PIN) == 0);
|
|
|
|
session = cap->session;
|
|
|
|
/* don't release wanted unless we've waited a bit. */
|
|
if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
|
|
time_before(jiffies, ci->i_hold_caps_min)) {
|
|
dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(cap->issued & retain),
|
|
ceph_cap_string(cap->mds_wanted),
|
|
ceph_cap_string(want));
|
|
want |= cap->mds_wanted;
|
|
retain |= cap->issued;
|
|
delayed = 1;
|
|
}
|
|
ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
|
|
|
|
cap->issued &= retain; /* drop bits we don't want */
|
|
if (cap->implemented & ~cap->issued) {
|
|
/*
|
|
* Wake up any waiters on wanted -> needed transition.
|
|
* This is due to the weird transition from buffered
|
|
* to sync IO... we need to flush dirty pages _before_
|
|
* allowing sync writes to avoid reordering.
|
|
*/
|
|
wake = 1;
|
|
}
|
|
cap->implemented &= cap->issued | used;
|
|
cap->mds_wanted = want;
|
|
|
|
follows = flushing ? ci->i_head_snapc->seq : 0;
|
|
|
|
keep = cap->implemented;
|
|
seq = cap->seq;
|
|
issue_seq = cap->issue_seq;
|
|
mseq = cap->mseq;
|
|
size = inode->i_size;
|
|
ci->i_reported_size = size;
|
|
max_size = ci->i_wanted_max_size;
|
|
ci->i_requested_max_size = max_size;
|
|
mtime = inode->i_mtime;
|
|
atime = inode->i_atime;
|
|
time_warp_seq = ci->i_time_warp_seq;
|
|
uid = inode->i_uid;
|
|
gid = inode->i_gid;
|
|
mode = inode->i_mode;
|
|
|
|
if (flushing & CEPH_CAP_XATTR_EXCL) {
|
|
__ceph_build_xattrs_blob(ci);
|
|
xattr_blob = ci->i_xattrs.blob;
|
|
xattr_version = ci->i_xattrs.version;
|
|
}
|
|
|
|
inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
|
|
op, keep, want, flushing, seq,
|
|
flush_tid, oldest_flush_tid, issue_seq, mseq,
|
|
size, max_size, &mtime, &atime, time_warp_seq,
|
|
uid, gid, mode, xattr_version, xattr_blob,
|
|
follows, inline_data);
|
|
if (ret < 0) {
|
|
dout("error sending cap msg, must requeue %p\n", inode);
|
|
delayed = 1;
|
|
}
|
|
|
|
if (wake)
|
|
wake_up_all(&ci->i_cap_wq);
|
|
|
|
return delayed;
|
|
}
|
|
|
|
/*
|
|
* When a snapshot is taken, clients accumulate dirty metadata on
|
|
* inodes with capabilities in ceph_cap_snaps to describe the file
|
|
* state at the time the snapshot was taken. This must be flushed
|
|
* asynchronously back to the MDS once sync writes complete and dirty
|
|
* data is written out.
|
|
*
|
|
* Unless @kick is true, skip cap_snaps that were already sent to
|
|
* the MDS (i.e., during this session).
|
|
*
|
|
* Called under i_ceph_lock. Takes s_mutex as needed.
|
|
*/
|
|
void __ceph_flush_snaps(struct ceph_inode_info *ci,
|
|
struct ceph_mds_session **psession,
|
|
int kick)
|
|
__releases(ci->i_ceph_lock)
|
|
__acquires(ci->i_ceph_lock)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int mds;
|
|
struct ceph_cap_snap *capsnap;
|
|
u32 mseq;
|
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
|
|
struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
|
|
session->s_mutex */
|
|
u64 next_follows = 0; /* keep track of how far we've gotten through the
|
|
i_cap_snaps list, and skip these entries next time
|
|
around to avoid an infinite loop */
|
|
|
|
if (psession)
|
|
session = *psession;
|
|
|
|
dout("__flush_snaps %p\n", inode);
|
|
retry:
|
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
|
|
/* avoid an infiniute loop after retry */
|
|
if (capsnap->follows < next_follows)
|
|
continue;
|
|
/*
|
|
* we need to wait for sync writes to complete and for dirty
|
|
* pages to be written out.
|
|
*/
|
|
if (capsnap->dirty_pages || capsnap->writing)
|
|
break;
|
|
|
|
/* should be removed by ceph_try_drop_cap_snap() */
|
|
BUG_ON(!capsnap->need_flush);
|
|
|
|
/* pick mds, take s_mutex */
|
|
if (ci->i_auth_cap == NULL) {
|
|
dout("no auth cap (migrating?), doing nothing\n");
|
|
goto out;
|
|
}
|
|
|
|
/* only flush each capsnap once */
|
|
if (!kick && !list_empty(&capsnap->flushing_item)) {
|
|
dout("already flushed %p, skipping\n", capsnap);
|
|
continue;
|
|
}
|
|
|
|
mds = ci->i_auth_cap->session->s_mds;
|
|
mseq = ci->i_auth_cap->mseq;
|
|
|
|
if (session && session->s_mds != mds) {
|
|
dout("oops, wrong session %p mutex\n", session);
|
|
if (kick)
|
|
goto out;
|
|
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
session = NULL;
|
|
}
|
|
if (!session) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
mutex_lock(&mdsc->mutex);
|
|
session = __ceph_lookup_mds_session(mdsc, mds);
|
|
mutex_unlock(&mdsc->mutex);
|
|
if (session) {
|
|
dout("inverting session/ino locks on %p\n",
|
|
session);
|
|
mutex_lock(&session->s_mutex);
|
|
}
|
|
/*
|
|
* if session == NULL, we raced against a cap
|
|
* deletion or migration. retry, and we'll
|
|
* get a better @mds value next time.
|
|
*/
|
|
spin_lock(&ci->i_ceph_lock);
|
|
goto retry;
|
|
}
|
|
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
capsnap->flush_tid = ++mdsc->last_cap_flush_tid;
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
|
|
atomic_inc(&capsnap->nref);
|
|
if (list_empty(&capsnap->flushing_item))
|
|
list_add_tail(&capsnap->flushing_item,
|
|
&session->s_cap_snaps_flushing);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
|
|
inode, capsnap, capsnap->follows, capsnap->flush_tid);
|
|
send_cap_msg(session, ceph_vino(inode).ino, 0,
|
|
CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
|
|
capsnap->dirty, 0, capsnap->flush_tid, 0,
|
|
0, mseq, capsnap->size, 0,
|
|
&capsnap->mtime, &capsnap->atime,
|
|
capsnap->time_warp_seq,
|
|
capsnap->uid, capsnap->gid, capsnap->mode,
|
|
capsnap->xattr_version, capsnap->xattr_blob,
|
|
capsnap->follows, capsnap->inline_data);
|
|
|
|
next_follows = capsnap->follows + 1;
|
|
ceph_put_cap_snap(capsnap);
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
goto retry;
|
|
}
|
|
|
|
/* we flushed them all; remove this inode from the queue */
|
|
spin_lock(&mdsc->snap_flush_lock);
|
|
list_del_init(&ci->i_snap_flush_item);
|
|
spin_unlock(&mdsc->snap_flush_lock);
|
|
|
|
out:
|
|
if (psession)
|
|
*psession = session;
|
|
else if (session) {
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
}
|
|
}
|
|
|
|
static void ceph_flush_snaps(struct ceph_inode_info *ci)
|
|
{
|
|
spin_lock(&ci->i_ceph_lock);
|
|
__ceph_flush_snaps(ci, NULL, 0);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
|
|
/*
|
|
* Mark caps dirty. If inode is newly dirty, return the dirty flags.
|
|
* Caller is then responsible for calling __mark_inode_dirty with the
|
|
* returned flags value.
|
|
*/
|
|
int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
|
|
struct ceph_cap_flush **pcf)
|
|
{
|
|
struct ceph_mds_client *mdsc =
|
|
ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int was = ci->i_dirty_caps;
|
|
int dirty = 0;
|
|
|
|
if (!ci->i_auth_cap) {
|
|
pr_warn("__mark_dirty_caps %p %llx mask %s, "
|
|
"but no auth cap (session was closed?)\n",
|
|
inode, ceph_ino(inode), ceph_cap_string(mask));
|
|
return 0;
|
|
}
|
|
|
|
dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
|
|
ceph_cap_string(mask), ceph_cap_string(was),
|
|
ceph_cap_string(was | mask));
|
|
ci->i_dirty_caps |= mask;
|
|
if (was == 0) {
|
|
WARN_ON_ONCE(ci->i_prealloc_cap_flush);
|
|
swap(ci->i_prealloc_cap_flush, *pcf);
|
|
|
|
if (!ci->i_head_snapc) {
|
|
WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem));
|
|
ci->i_head_snapc = ceph_get_snap_context(
|
|
ci->i_snap_realm->cached_context);
|
|
}
|
|
dout(" inode %p now dirty snapc %p auth cap %p\n",
|
|
&ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap);
|
|
BUG_ON(!list_empty(&ci->i_dirty_item));
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
if (ci->i_flushing_caps == 0) {
|
|
ihold(inode);
|
|
dirty |= I_DIRTY_SYNC;
|
|
}
|
|
} else {
|
|
WARN_ON_ONCE(!ci->i_prealloc_cap_flush);
|
|
}
|
|
BUG_ON(list_empty(&ci->i_dirty_item));
|
|
if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
|
|
(mask & CEPH_CAP_FILE_BUFFER))
|
|
dirty |= I_DIRTY_DATASYNC;
|
|
__cap_delay_requeue(mdsc, ci);
|
|
return dirty;
|
|
}
|
|
|
|
static void __add_cap_flushing_to_inode(struct ceph_inode_info *ci,
|
|
struct ceph_cap_flush *cf)
|
|
{
|
|
struct rb_node **p = &ci->i_cap_flush_tree.rb_node;
|
|
struct rb_node *parent = NULL;
|
|
struct ceph_cap_flush *other = NULL;
|
|
|
|
while (*p) {
|
|
parent = *p;
|
|
other = rb_entry(parent, struct ceph_cap_flush, i_node);
|
|
|
|
if (cf->tid < other->tid)
|
|
p = &(*p)->rb_left;
|
|
else if (cf->tid > other->tid)
|
|
p = &(*p)->rb_right;
|
|
else
|
|
BUG();
|
|
}
|
|
|
|
rb_link_node(&cf->i_node, parent, p);
|
|
rb_insert_color(&cf->i_node, &ci->i_cap_flush_tree);
|
|
}
|
|
|
|
static void __add_cap_flushing_to_mdsc(struct ceph_mds_client *mdsc,
|
|
struct ceph_cap_flush *cf)
|
|
{
|
|
struct rb_node **p = &mdsc->cap_flush_tree.rb_node;
|
|
struct rb_node *parent = NULL;
|
|
struct ceph_cap_flush *other = NULL;
|
|
|
|
while (*p) {
|
|
parent = *p;
|
|
other = rb_entry(parent, struct ceph_cap_flush, g_node);
|
|
|
|
if (cf->tid < other->tid)
|
|
p = &(*p)->rb_left;
|
|
else if (cf->tid > other->tid)
|
|
p = &(*p)->rb_right;
|
|
else
|
|
BUG();
|
|
}
|
|
|
|
rb_link_node(&cf->g_node, parent, p);
|
|
rb_insert_color(&cf->g_node, &mdsc->cap_flush_tree);
|
|
}
|
|
|
|
struct ceph_cap_flush *ceph_alloc_cap_flush(void)
|
|
{
|
|
return kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL);
|
|
}
|
|
|
|
void ceph_free_cap_flush(struct ceph_cap_flush *cf)
|
|
{
|
|
if (cf)
|
|
kmem_cache_free(ceph_cap_flush_cachep, cf);
|
|
}
|
|
|
|
static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct rb_node *n = rb_first(&mdsc->cap_flush_tree);
|
|
if (n) {
|
|
struct ceph_cap_flush *cf =
|
|
rb_entry(n, struct ceph_cap_flush, g_node);
|
|
return cf->tid;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Add dirty inode to the flushing list. Assigned a seq number so we
|
|
* can wait for caps to flush without starving.
|
|
*
|
|
* Called under i_ceph_lock.
|
|
*/
|
|
static int __mark_caps_flushing(struct inode *inode,
|
|
struct ceph_mds_session *session,
|
|
u64 *flush_tid, u64 *oldest_flush_tid)
|
|
{
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_cap_flush *cf = NULL;
|
|
int flushing;
|
|
|
|
BUG_ON(ci->i_dirty_caps == 0);
|
|
BUG_ON(list_empty(&ci->i_dirty_item));
|
|
BUG_ON(!ci->i_prealloc_cap_flush);
|
|
|
|
flushing = ci->i_dirty_caps;
|
|
dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
|
|
ceph_cap_string(flushing),
|
|
ceph_cap_string(ci->i_flushing_caps),
|
|
ceph_cap_string(ci->i_flushing_caps | flushing));
|
|
ci->i_flushing_caps |= flushing;
|
|
ci->i_dirty_caps = 0;
|
|
dout(" inode %p now !dirty\n", inode);
|
|
|
|
swap(cf, ci->i_prealloc_cap_flush);
|
|
cf->caps = flushing;
|
|
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
list_del_init(&ci->i_dirty_item);
|
|
|
|
cf->tid = ++mdsc->last_cap_flush_tid;
|
|
__add_cap_flushing_to_mdsc(mdsc, cf);
|
|
*oldest_flush_tid = __get_oldest_flush_tid(mdsc);
|
|
|
|
if (list_empty(&ci->i_flushing_item)) {
|
|
list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
|
|
mdsc->num_cap_flushing++;
|
|
dout(" inode %p now flushing tid %llu\n", inode, cf->tid);
|
|
} else {
|
|
list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
|
|
dout(" inode %p now flushing (more) tid %llu\n",
|
|
inode, cf->tid);
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
|
|
__add_cap_flushing_to_inode(ci, cf);
|
|
|
|
*flush_tid = cf->tid;
|
|
return flushing;
|
|
}
|
|
|
|
/*
|
|
* try to invalidate mapping pages without blocking.
|
|
*/
|
|
static int try_nonblocking_invalidate(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
u32 invalidating_gen = ci->i_rdcache_gen;
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
invalidate_mapping_pages(&inode->i_data, 0, -1);
|
|
spin_lock(&ci->i_ceph_lock);
|
|
|
|
if (inode->i_data.nrpages == 0 &&
|
|
invalidating_gen == ci->i_rdcache_gen) {
|
|
/* success. */
|
|
dout("try_nonblocking_invalidate %p success\n", inode);
|
|
/* save any racing async invalidate some trouble */
|
|
ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
|
|
return 0;
|
|
}
|
|
dout("try_nonblocking_invalidate %p failed\n", inode);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Swiss army knife function to examine currently used and wanted
|
|
* versus held caps. Release, flush, ack revoked caps to mds as
|
|
* appropriate.
|
|
*
|
|
* CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
|
|
* cap release further.
|
|
* CHECK_CAPS_AUTHONLY - we should only check the auth cap
|
|
* CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
|
|
* further delay.
|
|
*/
|
|
void ceph_check_caps(struct ceph_inode_info *ci, int flags,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct inode *inode = &ci->vfs_inode;
|
|
struct ceph_cap *cap;
|
|
u64 flush_tid, oldest_flush_tid;
|
|
int file_wanted, used, cap_used;
|
|
int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
|
|
int issued, implemented, want, retain, revoking, flushing = 0;
|
|
int mds = -1; /* keep track of how far we've gone through i_caps list
|
|
to avoid an infinite loop on retry */
|
|
struct rb_node *p;
|
|
int tried_invalidate = 0;
|
|
int delayed = 0, sent = 0, force_requeue = 0, num;
|
|
int queue_invalidate = 0;
|
|
int is_delayed = flags & CHECK_CAPS_NODELAY;
|
|
|
|
/* if we are unmounting, flush any unused caps immediately. */
|
|
if (mdsc->stopping)
|
|
is_delayed = 1;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
|
|
if (ci->i_ceph_flags & CEPH_I_FLUSH)
|
|
flags |= CHECK_CAPS_FLUSH;
|
|
|
|
/* flush snaps first time around only */
|
|
if (!list_empty(&ci->i_cap_snaps))
|
|
__ceph_flush_snaps(ci, &session, 0);
|
|
goto retry_locked;
|
|
retry:
|
|
spin_lock(&ci->i_ceph_lock);
|
|
retry_locked:
|
|
file_wanted = __ceph_caps_file_wanted(ci);
|
|
used = __ceph_caps_used(ci);
|
|
issued = __ceph_caps_issued(ci, &implemented);
|
|
revoking = implemented & ~issued;
|
|
|
|
want = file_wanted;
|
|
retain = file_wanted | used | CEPH_CAP_PIN;
|
|
if (!mdsc->stopping && inode->i_nlink > 0) {
|
|
if (file_wanted) {
|
|
retain |= CEPH_CAP_ANY; /* be greedy */
|
|
} else if (S_ISDIR(inode->i_mode) &&
|
|
(issued & CEPH_CAP_FILE_SHARED) &&
|
|
__ceph_dir_is_complete(ci)) {
|
|
/*
|
|
* If a directory is complete, we want to keep
|
|
* the exclusive cap. So that MDS does not end up
|
|
* revoking the shared cap on every create/unlink
|
|
* operation.
|
|
*/
|
|
want = CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
|
|
retain |= want;
|
|
} else {
|
|
|
|
retain |= CEPH_CAP_ANY_SHARED;
|
|
/*
|
|
* keep RD only if we didn't have the file open RW,
|
|
* because then the mds would revoke it anyway to
|
|
* journal max_size=0.
|
|
*/
|
|
if (ci->i_max_size == 0)
|
|
retain |= CEPH_CAP_ANY_RD;
|
|
}
|
|
}
|
|
|
|
dout("check_caps %p file_want %s used %s dirty %s flushing %s"
|
|
" issued %s revoking %s retain %s %s%s%s\n", inode,
|
|
ceph_cap_string(file_wanted),
|
|
ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
|
|
ceph_cap_string(ci->i_flushing_caps),
|
|
ceph_cap_string(issued), ceph_cap_string(revoking),
|
|
ceph_cap_string(retain),
|
|
(flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
|
|
(flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
|
|
(flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
|
|
|
|
/*
|
|
* If we no longer need to hold onto old our caps, and we may
|
|
* have cached pages, but don't want them, then try to invalidate.
|
|
* If we fail, it's because pages are locked.... try again later.
|
|
*/
|
|
if ((!is_delayed || mdsc->stopping) &&
|
|
!S_ISDIR(inode->i_mode) && /* ignore readdir cache */
|
|
ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
|
|
inode->i_data.nrpages && /* have cached pages */
|
|
(revoking & (CEPH_CAP_FILE_CACHE|
|
|
CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */
|
|
!tried_invalidate) {
|
|
dout("check_caps trying to invalidate on %p\n", inode);
|
|
if (try_nonblocking_invalidate(inode) < 0) {
|
|
if (revoking & (CEPH_CAP_FILE_CACHE|
|
|
CEPH_CAP_FILE_LAZYIO)) {
|
|
dout("check_caps queuing invalidate\n");
|
|
queue_invalidate = 1;
|
|
ci->i_rdcache_revoking = ci->i_rdcache_gen;
|
|
} else {
|
|
dout("check_caps failed to invalidate pages\n");
|
|
/* we failed to invalidate pages. check these
|
|
caps again later. */
|
|
force_requeue = 1;
|
|
__cap_set_timeouts(mdsc, ci);
|
|
}
|
|
}
|
|
tried_invalidate = 1;
|
|
goto retry_locked;
|
|
}
|
|
|
|
num = 0;
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
num++;
|
|
|
|
/* avoid looping forever */
|
|
if (mds >= cap->mds ||
|
|
((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
|
|
continue;
|
|
|
|
/* NOTE: no side-effects allowed, until we take s_mutex */
|
|
|
|
cap_used = used;
|
|
if (ci->i_auth_cap && cap != ci->i_auth_cap)
|
|
cap_used &= ~ci->i_auth_cap->issued;
|
|
|
|
revoking = cap->implemented & ~cap->issued;
|
|
dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
|
|
cap->mds, cap, ceph_cap_string(cap->issued),
|
|
ceph_cap_string(cap_used),
|
|
ceph_cap_string(cap->implemented),
|
|
ceph_cap_string(revoking));
|
|
|
|
if (cap == ci->i_auth_cap &&
|
|
(cap->issued & CEPH_CAP_FILE_WR)) {
|
|
/* request larger max_size from MDS? */
|
|
if (ci->i_wanted_max_size > ci->i_max_size &&
|
|
ci->i_wanted_max_size > ci->i_requested_max_size) {
|
|
dout("requesting new max_size\n");
|
|
goto ack;
|
|
}
|
|
|
|
/* approaching file_max? */
|
|
if ((inode->i_size << 1) >= ci->i_max_size &&
|
|
(ci->i_reported_size << 1) < ci->i_max_size) {
|
|
dout("i_size approaching max_size\n");
|
|
goto ack;
|
|
}
|
|
}
|
|
/* flush anything dirty? */
|
|
if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
|
|
ci->i_dirty_caps) {
|
|
dout("flushing dirty caps\n");
|
|
goto ack;
|
|
}
|
|
|
|
/* completed revocation? going down and there are no caps? */
|
|
if (revoking && (revoking & cap_used) == 0) {
|
|
dout("completed revocation of %s\n",
|
|
ceph_cap_string(cap->implemented & ~cap->issued));
|
|
goto ack;
|
|
}
|
|
|
|
/* want more caps from mds? */
|
|
if (want & ~(cap->mds_wanted | cap->issued))
|
|
goto ack;
|
|
|
|
/* things we might delay */
|
|
if ((cap->issued & ~retain) == 0 &&
|
|
cap->mds_wanted == want)
|
|
continue; /* nope, all good */
|
|
|
|
if (is_delayed)
|
|
goto ack;
|
|
|
|
/* delay? */
|
|
if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
|
|
time_before(jiffies, ci->i_hold_caps_max)) {
|
|
dout(" delaying issued %s -> %s, wanted %s -> %s\n",
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(cap->issued & retain),
|
|
ceph_cap_string(cap->mds_wanted),
|
|
ceph_cap_string(want));
|
|
delayed++;
|
|
continue;
|
|
}
|
|
|
|
ack:
|
|
if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
|
|
dout(" skipping %p I_NOFLUSH set\n", inode);
|
|
continue;
|
|
}
|
|
|
|
if (session && session != cap->session) {
|
|
dout("oops, wrong session %p mutex\n", session);
|
|
mutex_unlock(&session->s_mutex);
|
|
session = NULL;
|
|
}
|
|
if (!session) {
|
|
session = cap->session;
|
|
if (mutex_trylock(&session->s_mutex) == 0) {
|
|
dout("inverting session/ino locks on %p\n",
|
|
session);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (took_snap_rwsem) {
|
|
up_read(&mdsc->snap_rwsem);
|
|
took_snap_rwsem = 0;
|
|
}
|
|
mutex_lock(&session->s_mutex);
|
|
goto retry;
|
|
}
|
|
}
|
|
/* take snap_rwsem after session mutex */
|
|
if (!took_snap_rwsem) {
|
|
if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
|
|
dout("inverting snap/in locks on %p\n",
|
|
inode);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
down_read(&mdsc->snap_rwsem);
|
|
took_snap_rwsem = 1;
|
|
goto retry;
|
|
}
|
|
took_snap_rwsem = 1;
|
|
}
|
|
|
|
if (cap == ci->i_auth_cap && ci->i_dirty_caps) {
|
|
flushing = __mark_caps_flushing(inode, session,
|
|
&flush_tid,
|
|
&oldest_flush_tid);
|
|
} else {
|
|
flushing = 0;
|
|
flush_tid = 0;
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
}
|
|
|
|
mds = cap->mds; /* remember mds, so we don't repeat */
|
|
sent++;
|
|
|
|
/* __send_cap drops i_ceph_lock */
|
|
delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
|
|
want, retain, flushing,
|
|
flush_tid, oldest_flush_tid);
|
|
goto retry; /* retake i_ceph_lock and restart our cap scan. */
|
|
}
|
|
|
|
/*
|
|
* Reschedule delayed caps release if we delayed anything,
|
|
* otherwise cancel.
|
|
*/
|
|
if (delayed && is_delayed)
|
|
force_requeue = 1; /* __send_cap delayed release; requeue */
|
|
if (!delayed && !is_delayed)
|
|
__cap_delay_cancel(mdsc, ci);
|
|
else if (!is_delayed || force_requeue)
|
|
__cap_delay_requeue(mdsc, ci);
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (queue_invalidate)
|
|
ceph_queue_invalidate(inode);
|
|
|
|
if (session)
|
|
mutex_unlock(&session->s_mutex);
|
|
if (took_snap_rwsem)
|
|
up_read(&mdsc->snap_rwsem);
|
|
}
|
|
|
|
/*
|
|
* Try to flush dirty caps back to the auth mds.
|
|
*/
|
|
static int try_flush_caps(struct inode *inode, u64 *ptid)
|
|
{
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_mds_session *session = NULL;
|
|
int flushing = 0;
|
|
u64 flush_tid = 0, oldest_flush_tid = 0;
|
|
|
|
retry:
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
|
|
dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
|
|
goto out;
|
|
}
|
|
if (ci->i_dirty_caps && ci->i_auth_cap) {
|
|
struct ceph_cap *cap = ci->i_auth_cap;
|
|
int used = __ceph_caps_used(ci);
|
|
int want = __ceph_caps_wanted(ci);
|
|
int delayed;
|
|
|
|
if (!session || session != cap->session) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (session)
|
|
mutex_unlock(&session->s_mutex);
|
|
session = cap->session;
|
|
mutex_lock(&session->s_mutex);
|
|
goto retry;
|
|
}
|
|
if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
|
|
goto out;
|
|
|
|
flushing = __mark_caps_flushing(inode, session, &flush_tid,
|
|
&oldest_flush_tid);
|
|
|
|
/* __send_cap drops i_ceph_lock */
|
|
delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
|
|
(cap->issued | cap->implemented),
|
|
flushing, flush_tid, oldest_flush_tid);
|
|
|
|
if (delayed) {
|
|
spin_lock(&ci->i_ceph_lock);
|
|
__cap_delay_requeue(mdsc, ci);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
} else {
|
|
struct rb_node *n = rb_last(&ci->i_cap_flush_tree);
|
|
if (n) {
|
|
struct ceph_cap_flush *cf =
|
|
rb_entry(n, struct ceph_cap_flush, i_node);
|
|
flush_tid = cf->tid;
|
|
}
|
|
flushing = ci->i_flushing_caps;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
out:
|
|
if (session)
|
|
mutex_unlock(&session->s_mutex);
|
|
|
|
*ptid = flush_tid;
|
|
return flushing;
|
|
}
|
|
|
|
/*
|
|
* Return true if we've flushed caps through the given flush_tid.
|
|
*/
|
|
static int caps_are_flushed(struct inode *inode, u64 flush_tid)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_cap_flush *cf;
|
|
struct rb_node *n;
|
|
int ret = 1;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
n = rb_first(&ci->i_cap_flush_tree);
|
|
if (n) {
|
|
cf = rb_entry(n, struct ceph_cap_flush, i_node);
|
|
if (cf->tid <= flush_tid)
|
|
ret = 0;
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Wait on any unsafe replies for the given inode. First wait on the
|
|
* newest request, and make that the upper bound. Then, if there are
|
|
* more requests, keep waiting on the oldest as long as it is still older
|
|
* than the original request.
|
|
*/
|
|
static void sync_write_wait(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct list_head *head = &ci->i_unsafe_writes;
|
|
struct ceph_osd_request *req;
|
|
u64 last_tid;
|
|
|
|
if (!S_ISREG(inode->i_mode))
|
|
return;
|
|
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
if (list_empty(head))
|
|
goto out;
|
|
|
|
/* set upper bound as _last_ entry in chain */
|
|
req = list_last_entry(head, struct ceph_osd_request,
|
|
r_unsafe_item);
|
|
last_tid = req->r_tid;
|
|
|
|
do {
|
|
ceph_osdc_get_request(req);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
dout("sync_write_wait on tid %llu (until %llu)\n",
|
|
req->r_tid, last_tid);
|
|
wait_for_completion(&req->r_safe_completion);
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
ceph_osdc_put_request(req);
|
|
|
|
/*
|
|
* from here on look at first entry in chain, since we
|
|
* only want to wait for anything older than last_tid
|
|
*/
|
|
if (list_empty(head))
|
|
break;
|
|
req = list_first_entry(head, struct ceph_osd_request,
|
|
r_unsafe_item);
|
|
} while (req->r_tid < last_tid);
|
|
out:
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
}
|
|
|
|
/*
|
|
* wait for any unsafe requests to complete.
|
|
*/
|
|
static int unsafe_request_wait(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_mds_request *req1 = NULL, *req2 = NULL;
|
|
int ret, err = 0;
|
|
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) {
|
|
req1 = list_last_entry(&ci->i_unsafe_dirops,
|
|
struct ceph_mds_request,
|
|
r_unsafe_dir_item);
|
|
ceph_mdsc_get_request(req1);
|
|
}
|
|
if (!list_empty(&ci->i_unsafe_iops)) {
|
|
req2 = list_last_entry(&ci->i_unsafe_iops,
|
|
struct ceph_mds_request,
|
|
r_unsafe_target_item);
|
|
ceph_mdsc_get_request(req2);
|
|
}
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
|
|
dout("unsafe_requeset_wait %p wait on tid %llu %llu\n",
|
|
inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL);
|
|
if (req1) {
|
|
ret = !wait_for_completion_timeout(&req1->r_safe_completion,
|
|
ceph_timeout_jiffies(req1->r_timeout));
|
|
if (ret)
|
|
err = -EIO;
|
|
ceph_mdsc_put_request(req1);
|
|
}
|
|
if (req2) {
|
|
ret = !wait_for_completion_timeout(&req2->r_safe_completion,
|
|
ceph_timeout_jiffies(req2->r_timeout));
|
|
if (ret)
|
|
err = -EIO;
|
|
ceph_mdsc_put_request(req2);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
u64 flush_tid;
|
|
int ret;
|
|
int dirty;
|
|
|
|
dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
|
|
sync_write_wait(inode);
|
|
|
|
ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (datasync)
|
|
goto out;
|
|
|
|
inode_lock(inode);
|
|
|
|
dirty = try_flush_caps(inode, &flush_tid);
|
|
dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
|
|
|
|
ret = unsafe_request_wait(inode);
|
|
|
|
/*
|
|
* only wait on non-file metadata writeback (the mds
|
|
* can recover size and mtime, so we don't need to
|
|
* wait for that)
|
|
*/
|
|
if (!ret && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
|
|
ret = wait_event_interruptible(ci->i_cap_wq,
|
|
caps_are_flushed(inode, flush_tid));
|
|
}
|
|
inode_unlock(inode);
|
|
out:
|
|
dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Flush any dirty caps back to the mds. If we aren't asked to wait,
|
|
* queue inode for flush but don't do so immediately, because we can
|
|
* get by with fewer MDS messages if we wait for data writeback to
|
|
* complete first.
|
|
*/
|
|
int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
u64 flush_tid;
|
|
int err = 0;
|
|
int dirty;
|
|
int wait = wbc->sync_mode == WB_SYNC_ALL;
|
|
|
|
dout("write_inode %p wait=%d\n", inode, wait);
|
|
if (wait) {
|
|
dirty = try_flush_caps(inode, &flush_tid);
|
|
if (dirty)
|
|
err = wait_event_interruptible(ci->i_cap_wq,
|
|
caps_are_flushed(inode, flush_tid));
|
|
} else {
|
|
struct ceph_mds_client *mdsc =
|
|
ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (__ceph_caps_dirty(ci))
|
|
__cap_delay_requeue_front(mdsc, ci);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* After a recovering MDS goes active, we need to resend any caps
|
|
* we were flushing.
|
|
*
|
|
* Caller holds session->s_mutex.
|
|
*/
|
|
static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_cap_snap *capsnap;
|
|
|
|
dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
|
|
list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
|
|
flushing_item) {
|
|
struct ceph_inode_info *ci = capsnap->ci;
|
|
struct inode *inode = &ci->vfs_inode;
|
|
struct ceph_cap *cap;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
cap = ci->i_auth_cap;
|
|
if (cap && cap->session == session) {
|
|
dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
|
|
cap, capsnap);
|
|
__ceph_flush_snaps(ci, &session, 1);
|
|
} else {
|
|
pr_err("%p auth cap %p not mds%d ???\n", inode,
|
|
cap, session->s_mds);
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
}
|
|
|
|
static int __kick_flushing_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_inode_info *ci)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
struct ceph_cap *cap;
|
|
struct ceph_cap_flush *cf;
|
|
struct rb_node *n;
|
|
int delayed = 0;
|
|
u64 first_tid = 0;
|
|
u64 oldest_flush_tid;
|
|
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
oldest_flush_tid = __get_oldest_flush_tid(mdsc);
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
|
|
while (true) {
|
|
spin_lock(&ci->i_ceph_lock);
|
|
cap = ci->i_auth_cap;
|
|
if (!(cap && cap->session == session)) {
|
|
pr_err("%p auth cap %p not mds%d ???\n", inode,
|
|
cap, session->s_mds);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
break;
|
|
}
|
|
|
|
for (n = rb_first(&ci->i_cap_flush_tree); n; n = rb_next(n)) {
|
|
cf = rb_entry(n, struct ceph_cap_flush, i_node);
|
|
if (cf->tid >= first_tid)
|
|
break;
|
|
}
|
|
if (!n) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
break;
|
|
}
|
|
|
|
cf = rb_entry(n, struct ceph_cap_flush, i_node);
|
|
|
|
first_tid = cf->tid + 1;
|
|
|
|
dout("kick_flushing_caps %p cap %p tid %llu %s\n", inode,
|
|
cap, cf->tid, ceph_cap_string(cf->caps));
|
|
delayed |= __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
|
|
__ceph_caps_used(ci),
|
|
__ceph_caps_wanted(ci),
|
|
cap->issued | cap->implemented,
|
|
cf->caps, cf->tid, oldest_flush_tid);
|
|
}
|
|
return delayed;
|
|
}
|
|
|
|
void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_inode_info *ci;
|
|
struct ceph_cap *cap;
|
|
|
|
dout("early_kick_flushing_caps mds%d\n", session->s_mds);
|
|
list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
|
|
spin_lock(&ci->i_ceph_lock);
|
|
cap = ci->i_auth_cap;
|
|
if (!(cap && cap->session == session)) {
|
|
pr_err("%p auth cap %p not mds%d ???\n",
|
|
&ci->vfs_inode, cap, session->s_mds);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
continue;
|
|
}
|
|
|
|
|
|
/*
|
|
* if flushing caps were revoked, we re-send the cap flush
|
|
* in client reconnect stage. This guarantees MDS * processes
|
|
* the cap flush message before issuing the flushing caps to
|
|
* other client.
|
|
*/
|
|
if ((cap->issued & ci->i_flushing_caps) !=
|
|
ci->i_flushing_caps) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (!__kick_flushing_caps(mdsc, session, ci))
|
|
continue;
|
|
spin_lock(&ci->i_ceph_lock);
|
|
}
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
}
|
|
|
|
void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_inode_info *ci;
|
|
|
|
kick_flushing_capsnaps(mdsc, session);
|
|
|
|
dout("kick_flushing_caps mds%d\n", session->s_mds);
|
|
list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
|
|
int delayed = __kick_flushing_caps(mdsc, session, ci);
|
|
if (delayed) {
|
|
spin_lock(&ci->i_ceph_lock);
|
|
__cap_delay_requeue(mdsc, ci);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_cap *cap;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
cap = ci->i_auth_cap;
|
|
dout("kick_flushing_inode_caps %p flushing %s\n", inode,
|
|
ceph_cap_string(ci->i_flushing_caps));
|
|
|
|
__ceph_flush_snaps(ci, &session, 1);
|
|
|
|
if (ci->i_flushing_caps) {
|
|
int delayed;
|
|
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
list_move_tail(&ci->i_flushing_item,
|
|
&cap->session->s_cap_flushing);
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
delayed = __kick_flushing_caps(mdsc, session, ci);
|
|
if (delayed) {
|
|
spin_lock(&ci->i_ceph_lock);
|
|
__cap_delay_requeue(mdsc, ci);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
} else {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Take references to capabilities we hold, so that we don't release
|
|
* them to the MDS prematurely.
|
|
*
|
|
* Protected by i_ceph_lock.
|
|
*/
|
|
static void __take_cap_refs(struct ceph_inode_info *ci, int got,
|
|
bool snap_rwsem_locked)
|
|
{
|
|
if (got & CEPH_CAP_PIN)
|
|
ci->i_pin_ref++;
|
|
if (got & CEPH_CAP_FILE_RD)
|
|
ci->i_rd_ref++;
|
|
if (got & CEPH_CAP_FILE_CACHE)
|
|
ci->i_rdcache_ref++;
|
|
if (got & CEPH_CAP_FILE_WR) {
|
|
if (ci->i_wr_ref == 0 && !ci->i_head_snapc) {
|
|
BUG_ON(!snap_rwsem_locked);
|
|
ci->i_head_snapc = ceph_get_snap_context(
|
|
ci->i_snap_realm->cached_context);
|
|
}
|
|
ci->i_wr_ref++;
|
|
}
|
|
if (got & CEPH_CAP_FILE_BUFFER) {
|
|
if (ci->i_wb_ref == 0)
|
|
ihold(&ci->vfs_inode);
|
|
ci->i_wb_ref++;
|
|
dout("__take_cap_refs %p wb %d -> %d (?)\n",
|
|
&ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Try to grab cap references. Specify those refs we @want, and the
|
|
* minimal set we @need. Also include the larger offset we are writing
|
|
* to (when applicable), and check against max_size here as well.
|
|
* Note that caller is responsible for ensuring max_size increases are
|
|
* requested from the MDS.
|
|
*/
|
|
static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
|
|
loff_t endoff, bool nonblock, int *got, int *err)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
|
|
int ret = 0;
|
|
int have, implemented;
|
|
int file_wanted;
|
|
bool snap_rwsem_locked = false;
|
|
|
|
dout("get_cap_refs %p need %s want %s\n", inode,
|
|
ceph_cap_string(need), ceph_cap_string(want));
|
|
|
|
again:
|
|
spin_lock(&ci->i_ceph_lock);
|
|
|
|
/* make sure file is actually open */
|
|
file_wanted = __ceph_caps_file_wanted(ci);
|
|
if ((file_wanted & need) == 0) {
|
|
dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
|
|
ceph_cap_string(need), ceph_cap_string(file_wanted));
|
|
*err = -EBADF;
|
|
ret = 1;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* finish pending truncate */
|
|
while (ci->i_truncate_pending) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (snap_rwsem_locked) {
|
|
up_read(&mdsc->snap_rwsem);
|
|
snap_rwsem_locked = false;
|
|
}
|
|
__ceph_do_pending_vmtruncate(inode);
|
|
spin_lock(&ci->i_ceph_lock);
|
|
}
|
|
|
|
have = __ceph_caps_issued(ci, &implemented);
|
|
|
|
if (have & need & CEPH_CAP_FILE_WR) {
|
|
if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
|
|
dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
|
|
inode, endoff, ci->i_max_size);
|
|
if (endoff > ci->i_requested_max_size) {
|
|
*err = -EAGAIN;
|
|
ret = 1;
|
|
}
|
|
goto out_unlock;
|
|
}
|
|
/*
|
|
* If a sync write is in progress, we must wait, so that we
|
|
* can get a final snapshot value for size+mtime.
|
|
*/
|
|
if (__ceph_have_pending_cap_snap(ci)) {
|
|
dout("get_cap_refs %p cap_snap_pending\n", inode);
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
if ((have & need) == need) {
|
|
/*
|
|
* Look at (implemented & ~have & not) so that we keep waiting
|
|
* on transition from wanted -> needed caps. This is needed
|
|
* for WRBUFFER|WR -> WR to avoid a new WR sync write from
|
|
* going before a prior buffered writeback happens.
|
|
*/
|
|
int not = want & ~(have & need);
|
|
int revoking = implemented & ~have;
|
|
dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
|
|
inode, ceph_cap_string(have), ceph_cap_string(not),
|
|
ceph_cap_string(revoking));
|
|
if ((revoking & not) == 0) {
|
|
if (!snap_rwsem_locked &&
|
|
!ci->i_head_snapc &&
|
|
(need & CEPH_CAP_FILE_WR)) {
|
|
if (!down_read_trylock(&mdsc->snap_rwsem)) {
|
|
/*
|
|
* we can not call down_read() when
|
|
* task isn't in TASK_RUNNING state
|
|
*/
|
|
if (nonblock) {
|
|
*err = -EAGAIN;
|
|
ret = 1;
|
|
goto out_unlock;
|
|
}
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
down_read(&mdsc->snap_rwsem);
|
|
snap_rwsem_locked = true;
|
|
goto again;
|
|
}
|
|
snap_rwsem_locked = true;
|
|
}
|
|
*got = need | (have & want);
|
|
__take_cap_refs(ci, *got, true);
|
|
ret = 1;
|
|
}
|
|
} else {
|
|
int session_readonly = false;
|
|
if ((need & CEPH_CAP_FILE_WR) && ci->i_auth_cap) {
|
|
struct ceph_mds_session *s = ci->i_auth_cap->session;
|
|
spin_lock(&s->s_cap_lock);
|
|
session_readonly = s->s_readonly;
|
|
spin_unlock(&s->s_cap_lock);
|
|
}
|
|
if (session_readonly) {
|
|
dout("get_cap_refs %p needed %s but mds%d readonly\n",
|
|
inode, ceph_cap_string(need), ci->i_auth_cap->mds);
|
|
*err = -EROFS;
|
|
ret = 1;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (!__ceph_is_any_caps(ci) &&
|
|
ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
|
|
dout("get_cap_refs %p forced umount\n", inode);
|
|
*err = -EIO;
|
|
ret = 1;
|
|
goto out_unlock;
|
|
}
|
|
|
|
dout("get_cap_refs %p have %s needed %s\n", inode,
|
|
ceph_cap_string(have), ceph_cap_string(need));
|
|
}
|
|
out_unlock:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (snap_rwsem_locked)
|
|
up_read(&mdsc->snap_rwsem);
|
|
|
|
dout("get_cap_refs %p ret %d got %s\n", inode,
|
|
ret, ceph_cap_string(*got));
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check the offset we are writing up to against our current
|
|
* max_size. If necessary, tell the MDS we want to write to
|
|
* a larger offset.
|
|
*/
|
|
static void check_max_size(struct inode *inode, loff_t endoff)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int check = 0;
|
|
|
|
/* do we need to explicitly request a larger max_size? */
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) {
|
|
dout("write %p at large endoff %llu, req max_size\n",
|
|
inode, endoff);
|
|
ci->i_wanted_max_size = endoff;
|
|
}
|
|
/* duplicate ceph_check_caps()'s logic */
|
|
if (ci->i_auth_cap &&
|
|
(ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
|
|
ci->i_wanted_max_size > ci->i_max_size &&
|
|
ci->i_wanted_max_size > ci->i_requested_max_size)
|
|
check = 1;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (check)
|
|
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
|
|
}
|
|
|
|
/*
|
|
* Wait for caps, and take cap references. If we can't get a WR cap
|
|
* due to a small max_size, make sure we check_max_size (and possibly
|
|
* ask the mds) so we don't get hung up indefinitely.
|
|
*/
|
|
int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
|
|
loff_t endoff, int *got, struct page **pinned_page)
|
|
{
|
|
int _got, ret, err = 0;
|
|
|
|
ret = ceph_pool_perm_check(ci, need);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
while (true) {
|
|
if (endoff > 0)
|
|
check_max_size(&ci->vfs_inode, endoff);
|
|
|
|
err = 0;
|
|
_got = 0;
|
|
ret = try_get_cap_refs(ci, need, want, endoff,
|
|
false, &_got, &err);
|
|
if (ret) {
|
|
if (err == -EAGAIN)
|
|
continue;
|
|
if (err < 0)
|
|
return err;
|
|
} else {
|
|
ret = wait_event_interruptible(ci->i_cap_wq,
|
|
try_get_cap_refs(ci, need, want, endoff,
|
|
true, &_got, &err));
|
|
if (err == -EAGAIN)
|
|
continue;
|
|
if (err < 0)
|
|
ret = err;
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (ci->i_inline_version != CEPH_INLINE_NONE &&
|
|
(_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
|
|
i_size_read(&ci->vfs_inode) > 0) {
|
|
struct page *page =
|
|
find_get_page(ci->vfs_inode.i_mapping, 0);
|
|
if (page) {
|
|
if (PageUptodate(page)) {
|
|
*pinned_page = page;
|
|
break;
|
|
}
|
|
page_cache_release(page);
|
|
}
|
|
/*
|
|
* drop cap refs first because getattr while
|
|
* holding * caps refs can cause deadlock.
|
|
*/
|
|
ceph_put_cap_refs(ci, _got);
|
|
_got = 0;
|
|
|
|
/*
|
|
* getattr request will bring inline data into
|
|
* page cache
|
|
*/
|
|
ret = __ceph_do_getattr(&ci->vfs_inode, NULL,
|
|
CEPH_STAT_CAP_INLINE_DATA,
|
|
true);
|
|
if (ret < 0)
|
|
return ret;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
*got = _got;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Take cap refs. Caller must already know we hold at least one ref
|
|
* on the caps in question or we don't know this is safe.
|
|
*/
|
|
void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
|
|
{
|
|
spin_lock(&ci->i_ceph_lock);
|
|
__take_cap_refs(ci, caps, false);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
|
|
|
|
/*
|
|
* drop cap_snap that is not associated with any snapshot.
|
|
* we don't need to send FLUSHSNAP message for it.
|
|
*/
|
|
static int ceph_try_drop_cap_snap(struct ceph_cap_snap *capsnap)
|
|
{
|
|
if (!capsnap->need_flush &&
|
|
!capsnap->writing && !capsnap->dirty_pages) {
|
|
|
|
dout("dropping cap_snap %p follows %llu\n",
|
|
capsnap, capsnap->follows);
|
|
ceph_put_snap_context(capsnap->context);
|
|
list_del(&capsnap->ci_item);
|
|
list_del(&capsnap->flushing_item);
|
|
ceph_put_cap_snap(capsnap);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Release cap refs.
|
|
*
|
|
* If we released the last ref on any given cap, call ceph_check_caps
|
|
* to release (or schedule a release).
|
|
*
|
|
* If we are releasing a WR cap (from a sync write), finalize any affected
|
|
* cap_snap, and wake up any waiters.
|
|
*/
|
|
void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int last = 0, put = 0, flushsnaps = 0, wake = 0;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (had & CEPH_CAP_PIN)
|
|
--ci->i_pin_ref;
|
|
if (had & CEPH_CAP_FILE_RD)
|
|
if (--ci->i_rd_ref == 0)
|
|
last++;
|
|
if (had & CEPH_CAP_FILE_CACHE)
|
|
if (--ci->i_rdcache_ref == 0)
|
|
last++;
|
|
if (had & CEPH_CAP_FILE_BUFFER) {
|
|
if (--ci->i_wb_ref == 0) {
|
|
last++;
|
|
put++;
|
|
}
|
|
dout("put_cap_refs %p wb %d -> %d (?)\n",
|
|
inode, ci->i_wb_ref+1, ci->i_wb_ref);
|
|
}
|
|
if (had & CEPH_CAP_FILE_WR)
|
|
if (--ci->i_wr_ref == 0) {
|
|
last++;
|
|
if (__ceph_have_pending_cap_snap(ci)) {
|
|
struct ceph_cap_snap *capsnap =
|
|
list_last_entry(&ci->i_cap_snaps,
|
|
struct ceph_cap_snap,
|
|
ci_item);
|
|
capsnap->writing = 0;
|
|
if (ceph_try_drop_cap_snap(capsnap))
|
|
put++;
|
|
else if (__ceph_finish_cap_snap(ci, capsnap))
|
|
flushsnaps = 1;
|
|
wake = 1;
|
|
}
|
|
if (ci->i_wrbuffer_ref_head == 0 &&
|
|
ci->i_dirty_caps == 0 &&
|
|
ci->i_flushing_caps == 0) {
|
|
BUG_ON(!ci->i_head_snapc);
|
|
ceph_put_snap_context(ci->i_head_snapc);
|
|
ci->i_head_snapc = NULL;
|
|
}
|
|
/* see comment in __ceph_remove_cap() */
|
|
if (!__ceph_is_any_caps(ci) && ci->i_snap_realm)
|
|
drop_inode_snap_realm(ci);
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
|
|
last ? " last" : "", put ? " put" : "");
|
|
|
|
if (last && !flushsnaps)
|
|
ceph_check_caps(ci, 0, NULL);
|
|
else if (flushsnaps)
|
|
ceph_flush_snaps(ci);
|
|
if (wake)
|
|
wake_up_all(&ci->i_cap_wq);
|
|
while (put-- > 0)
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
|
|
* context. Adjust per-snap dirty page accounting as appropriate.
|
|
* Once all dirty data for a cap_snap is flushed, flush snapped file
|
|
* metadata back to the MDS. If we dropped the last ref, call
|
|
* ceph_check_caps.
|
|
*/
|
|
void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
|
|
struct ceph_snap_context *snapc)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int last = 0;
|
|
int complete_capsnap = 0;
|
|
int drop_capsnap = 0;
|
|
int found = 0;
|
|
struct ceph_cap_snap *capsnap = NULL;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
ci->i_wrbuffer_ref -= nr;
|
|
last = !ci->i_wrbuffer_ref;
|
|
|
|
if (ci->i_head_snapc == snapc) {
|
|
ci->i_wrbuffer_ref_head -= nr;
|
|
if (ci->i_wrbuffer_ref_head == 0 &&
|
|
ci->i_wr_ref == 0 &&
|
|
ci->i_dirty_caps == 0 &&
|
|
ci->i_flushing_caps == 0) {
|
|
BUG_ON(!ci->i_head_snapc);
|
|
ceph_put_snap_context(ci->i_head_snapc);
|
|
ci->i_head_snapc = NULL;
|
|
}
|
|
dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
|
|
inode,
|
|
ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
|
|
ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
|
|
last ? " LAST" : "");
|
|
} else {
|
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
|
|
if (capsnap->context == snapc) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
BUG_ON(!found);
|
|
capsnap->dirty_pages -= nr;
|
|
if (capsnap->dirty_pages == 0) {
|
|
complete_capsnap = 1;
|
|
drop_capsnap = ceph_try_drop_cap_snap(capsnap);
|
|
}
|
|
dout("put_wrbuffer_cap_refs on %p cap_snap %p "
|
|
" snap %lld %d/%d -> %d/%d %s%s\n",
|
|
inode, capsnap, capsnap->context->seq,
|
|
ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
|
|
ci->i_wrbuffer_ref, capsnap->dirty_pages,
|
|
last ? " (wrbuffer last)" : "",
|
|
complete_capsnap ? " (complete capsnap)" : "");
|
|
}
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (last) {
|
|
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
|
|
iput(inode);
|
|
} else if (complete_capsnap) {
|
|
ceph_flush_snaps(ci);
|
|
wake_up_all(&ci->i_cap_wq);
|
|
}
|
|
if (drop_capsnap)
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
|
|
*/
|
|
static void invalidate_aliases(struct inode *inode)
|
|
{
|
|
struct dentry *dn, *prev = NULL;
|
|
|
|
dout("invalidate_aliases inode %p\n", inode);
|
|
d_prune_aliases(inode);
|
|
/*
|
|
* For non-directory inode, d_find_alias() only returns
|
|
* hashed dentry. After calling d_invalidate(), the
|
|
* dentry becomes unhashed.
|
|
*
|
|
* For directory inode, d_find_alias() can return
|
|
* unhashed dentry. But directory inode should have
|
|
* one alias at most.
|
|
*/
|
|
while ((dn = d_find_alias(inode))) {
|
|
if (dn == prev) {
|
|
dput(dn);
|
|
break;
|
|
}
|
|
d_invalidate(dn);
|
|
if (prev)
|
|
dput(prev);
|
|
prev = dn;
|
|
}
|
|
if (prev)
|
|
dput(prev);
|
|
}
|
|
|
|
/*
|
|
* Handle a cap GRANT message from the MDS. (Note that a GRANT may
|
|
* actually be a revocation if it specifies a smaller cap set.)
|
|
*
|
|
* caller holds s_mutex and i_ceph_lock, we drop both.
|
|
*/
|
|
static void handle_cap_grant(struct ceph_mds_client *mdsc,
|
|
struct inode *inode, struct ceph_mds_caps *grant,
|
|
u64 inline_version,
|
|
void *inline_data, int inline_len,
|
|
struct ceph_buffer *xattr_buf,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_cap *cap, int issued)
|
|
__releases(ci->i_ceph_lock)
|
|
__releases(mdsc->snap_rwsem)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int mds = session->s_mds;
|
|
int seq = le32_to_cpu(grant->seq);
|
|
int newcaps = le32_to_cpu(grant->caps);
|
|
int used, wanted, dirty;
|
|
u64 size = le64_to_cpu(grant->size);
|
|
u64 max_size = le64_to_cpu(grant->max_size);
|
|
struct timespec mtime, atime, ctime;
|
|
int check_caps = 0;
|
|
bool wake = false;
|
|
bool writeback = false;
|
|
bool queue_trunc = false;
|
|
bool queue_invalidate = false;
|
|
bool queue_revalidate = false;
|
|
bool deleted_inode = false;
|
|
bool fill_inline = false;
|
|
|
|
dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
|
|
inode, cap, mds, seq, ceph_cap_string(newcaps));
|
|
dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
|
|
inode->i_size);
|
|
|
|
|
|
/*
|
|
* auth mds of the inode changed. we received the cap export message,
|
|
* but still haven't received the cap import message. handle_cap_export
|
|
* updated the new auth MDS' cap.
|
|
*
|
|
* "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message
|
|
* that was sent before the cap import message. So don't remove caps.
|
|
*/
|
|
if (ceph_seq_cmp(seq, cap->seq) <= 0) {
|
|
WARN_ON(cap != ci->i_auth_cap);
|
|
WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id));
|
|
seq = cap->seq;
|
|
newcaps |= cap->issued;
|
|
}
|
|
|
|
/*
|
|
* If CACHE is being revoked, and we have no dirty buffers,
|
|
* try to invalidate (once). (If there are dirty buffers, we
|
|
* will invalidate _after_ writeback.)
|
|
*/
|
|
if (!S_ISDIR(inode->i_mode) && /* don't invalidate readdir cache */
|
|
((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
|
|
(newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
|
|
!ci->i_wrbuffer_ref) {
|
|
if (try_nonblocking_invalidate(inode)) {
|
|
/* there were locked pages.. invalidate later
|
|
in a separate thread. */
|
|
if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
|
|
queue_invalidate = true;
|
|
ci->i_rdcache_revoking = ci->i_rdcache_gen;
|
|
}
|
|
}
|
|
|
|
ceph_fscache_invalidate(inode);
|
|
}
|
|
|
|
/* side effects now are allowed */
|
|
cap->cap_gen = session->s_cap_gen;
|
|
cap->seq = seq;
|
|
|
|
__check_cap_issue(ci, cap, newcaps);
|
|
|
|
if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
|
|
(issued & CEPH_CAP_AUTH_EXCL) == 0) {
|
|
inode->i_mode = le32_to_cpu(grant->mode);
|
|
inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid));
|
|
inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid));
|
|
dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
|
|
from_kuid(&init_user_ns, inode->i_uid),
|
|
from_kgid(&init_user_ns, inode->i_gid));
|
|
}
|
|
|
|
if ((newcaps & CEPH_CAP_AUTH_SHARED) &&
|
|
(issued & CEPH_CAP_LINK_EXCL) == 0) {
|
|
set_nlink(inode, le32_to_cpu(grant->nlink));
|
|
if (inode->i_nlink == 0 &&
|
|
(newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
|
|
deleted_inode = true;
|
|
}
|
|
|
|
if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
|
|
int len = le32_to_cpu(grant->xattr_len);
|
|
u64 version = le64_to_cpu(grant->xattr_version);
|
|
|
|
if (version > ci->i_xattrs.version) {
|
|
dout(" got new xattrs v%llu on %p len %d\n",
|
|
version, inode, len);
|
|
if (ci->i_xattrs.blob)
|
|
ceph_buffer_put(ci->i_xattrs.blob);
|
|
ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
|
|
ci->i_xattrs.version = version;
|
|
ceph_forget_all_cached_acls(inode);
|
|
}
|
|
}
|
|
|
|
/* Do we need to revalidate our fscache cookie. Don't bother on the
|
|
* first cache cap as we already validate at cookie creation time. */
|
|
if ((issued & CEPH_CAP_FILE_CACHE) && ci->i_rdcache_gen > 1)
|
|
queue_revalidate = true;
|
|
|
|
if (newcaps & CEPH_CAP_ANY_RD) {
|
|
/* ctime/mtime/atime? */
|
|
ceph_decode_timespec(&mtime, &grant->mtime);
|
|
ceph_decode_timespec(&atime, &grant->atime);
|
|
ceph_decode_timespec(&ctime, &grant->ctime);
|
|
ceph_fill_file_time(inode, issued,
|
|
le32_to_cpu(grant->time_warp_seq),
|
|
&ctime, &mtime, &atime);
|
|
}
|
|
|
|
if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) {
|
|
/* file layout may have changed */
|
|
ci->i_layout = grant->layout;
|
|
/* size/truncate_seq? */
|
|
queue_trunc = ceph_fill_file_size(inode, issued,
|
|
le32_to_cpu(grant->truncate_seq),
|
|
le64_to_cpu(grant->truncate_size),
|
|
size);
|
|
/* max size increase? */
|
|
if (ci->i_auth_cap == cap && max_size != ci->i_max_size) {
|
|
dout("max_size %lld -> %llu\n",
|
|
ci->i_max_size, max_size);
|
|
ci->i_max_size = max_size;
|
|
if (max_size >= ci->i_wanted_max_size) {
|
|
ci->i_wanted_max_size = 0; /* reset */
|
|
ci->i_requested_max_size = 0;
|
|
}
|
|
wake = true;
|
|
}
|
|
}
|
|
|
|
/* check cap bits */
|
|
wanted = __ceph_caps_wanted(ci);
|
|
used = __ceph_caps_used(ci);
|
|
dirty = __ceph_caps_dirty(ci);
|
|
dout(" my wanted = %s, used = %s, dirty %s\n",
|
|
ceph_cap_string(wanted),
|
|
ceph_cap_string(used),
|
|
ceph_cap_string(dirty));
|
|
if (wanted != le32_to_cpu(grant->wanted)) {
|
|
dout("mds wanted %s -> %s\n",
|
|
ceph_cap_string(le32_to_cpu(grant->wanted)),
|
|
ceph_cap_string(wanted));
|
|
/* imported cap may not have correct mds_wanted */
|
|
if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
|
|
check_caps = 1;
|
|
}
|
|
|
|
/* revocation, grant, or no-op? */
|
|
if (cap->issued & ~newcaps) {
|
|
int revoking = cap->issued & ~newcaps;
|
|
|
|
dout("revocation: %s -> %s (revoking %s)\n",
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(newcaps),
|
|
ceph_cap_string(revoking));
|
|
if (revoking & used & CEPH_CAP_FILE_BUFFER)
|
|
writeback = true; /* initiate writeback; will delay ack */
|
|
else if (revoking == CEPH_CAP_FILE_CACHE &&
|
|
(newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
|
|
queue_invalidate)
|
|
; /* do nothing yet, invalidation will be queued */
|
|
else if (cap == ci->i_auth_cap)
|
|
check_caps = 1; /* check auth cap only */
|
|
else
|
|
check_caps = 2; /* check all caps */
|
|
cap->issued = newcaps;
|
|
cap->implemented |= newcaps;
|
|
} else if (cap->issued == newcaps) {
|
|
dout("caps unchanged: %s -> %s\n",
|
|
ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
|
|
} else {
|
|
dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
|
|
ceph_cap_string(newcaps));
|
|
/* non-auth MDS is revoking the newly grant caps ? */
|
|
if (cap == ci->i_auth_cap &&
|
|
__ceph_caps_revoking_other(ci, cap, newcaps))
|
|
check_caps = 2;
|
|
|
|
cap->issued = newcaps;
|
|
cap->implemented |= newcaps; /* add bits only, to
|
|
* avoid stepping on a
|
|
* pending revocation */
|
|
wake = true;
|
|
}
|
|
BUG_ON(cap->issued & ~cap->implemented);
|
|
|
|
if (inline_version > 0 && inline_version >= ci->i_inline_version) {
|
|
ci->i_inline_version = inline_version;
|
|
if (ci->i_inline_version != CEPH_INLINE_NONE &&
|
|
(newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)))
|
|
fill_inline = true;
|
|
}
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) {
|
|
kick_flushing_inode_caps(mdsc, session, inode);
|
|
up_read(&mdsc->snap_rwsem);
|
|
if (newcaps & ~issued)
|
|
wake = true;
|
|
}
|
|
|
|
if (fill_inline)
|
|
ceph_fill_inline_data(inode, NULL, inline_data, inline_len);
|
|
|
|
if (queue_trunc) {
|
|
ceph_queue_vmtruncate(inode);
|
|
ceph_queue_revalidate(inode);
|
|
} else if (queue_revalidate)
|
|
ceph_queue_revalidate(inode);
|
|
|
|
if (writeback)
|
|
/*
|
|
* queue inode for writeback: we can't actually call
|
|
* filemap_write_and_wait, etc. from message handler
|
|
* context.
|
|
*/
|
|
ceph_queue_writeback(inode);
|
|
if (queue_invalidate)
|
|
ceph_queue_invalidate(inode);
|
|
if (deleted_inode)
|
|
invalidate_aliases(inode);
|
|
if (wake)
|
|
wake_up_all(&ci->i_cap_wq);
|
|
|
|
if (check_caps == 1)
|
|
ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
|
|
session);
|
|
else if (check_caps == 2)
|
|
ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
|
|
else
|
|
mutex_unlock(&session->s_mutex);
|
|
}
|
|
|
|
/*
|
|
* Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
|
|
* MDS has been safely committed.
|
|
*/
|
|
static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
|
|
struct ceph_mds_caps *m,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_cap *cap)
|
|
__releases(ci->i_ceph_lock)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
struct ceph_cap_flush *cf;
|
|
struct rb_node *n;
|
|
LIST_HEAD(to_remove);
|
|
unsigned seq = le32_to_cpu(m->seq);
|
|
int dirty = le32_to_cpu(m->dirty);
|
|
int cleaned = 0;
|
|
int drop = 0;
|
|
|
|
n = rb_first(&ci->i_cap_flush_tree);
|
|
while (n) {
|
|
cf = rb_entry(n, struct ceph_cap_flush, i_node);
|
|
n = rb_next(&cf->i_node);
|
|
if (cf->tid == flush_tid)
|
|
cleaned = cf->caps;
|
|
if (cf->tid <= flush_tid) {
|
|
rb_erase(&cf->i_node, &ci->i_cap_flush_tree);
|
|
list_add_tail(&cf->list, &to_remove);
|
|
} else {
|
|
cleaned &= ~cf->caps;
|
|
if (!cleaned)
|
|
break;
|
|
}
|
|
}
|
|
|
|
dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
|
|
" flushing %s -> %s\n",
|
|
inode, session->s_mds, seq, ceph_cap_string(dirty),
|
|
ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
|
|
ceph_cap_string(ci->i_flushing_caps & ~cleaned));
|
|
|
|
if (list_empty(&to_remove) && !cleaned)
|
|
goto out;
|
|
|
|
ci->i_flushing_caps &= ~cleaned;
|
|
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
|
|
if (!list_empty(&to_remove)) {
|
|
list_for_each_entry(cf, &to_remove, list)
|
|
rb_erase(&cf->g_node, &mdsc->cap_flush_tree);
|
|
|
|
n = rb_first(&mdsc->cap_flush_tree);
|
|
cf = n ? rb_entry(n, struct ceph_cap_flush, g_node) : NULL;
|
|
if (!cf || cf->tid > flush_tid)
|
|
wake_up_all(&mdsc->cap_flushing_wq);
|
|
}
|
|
|
|
if (ci->i_flushing_caps == 0) {
|
|
list_del_init(&ci->i_flushing_item);
|
|
if (!list_empty(&session->s_cap_flushing))
|
|
dout(" mds%d still flushing cap on %p\n",
|
|
session->s_mds,
|
|
&list_entry(session->s_cap_flushing.next,
|
|
struct ceph_inode_info,
|
|
i_flushing_item)->vfs_inode);
|
|
mdsc->num_cap_flushing--;
|
|
dout(" inode %p now !flushing\n", inode);
|
|
|
|
if (ci->i_dirty_caps == 0) {
|
|
dout(" inode %p now clean\n", inode);
|
|
BUG_ON(!list_empty(&ci->i_dirty_item));
|
|
drop = 1;
|
|
if (ci->i_wr_ref == 0 &&
|
|
ci->i_wrbuffer_ref_head == 0) {
|
|
BUG_ON(!ci->i_head_snapc);
|
|
ceph_put_snap_context(ci->i_head_snapc);
|
|
ci->i_head_snapc = NULL;
|
|
}
|
|
} else {
|
|
BUG_ON(list_empty(&ci->i_dirty_item));
|
|
}
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
wake_up_all(&ci->i_cap_wq);
|
|
|
|
out:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
while (!list_empty(&to_remove)) {
|
|
cf = list_first_entry(&to_remove,
|
|
struct ceph_cap_flush, list);
|
|
list_del(&cf->list);
|
|
ceph_free_cap_flush(cf);
|
|
}
|
|
if (drop)
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
|
|
* throw away our cap_snap.
|
|
*
|
|
* Caller hold s_mutex.
|
|
*/
|
|
static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
|
|
struct ceph_mds_caps *m,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
u64 follows = le64_to_cpu(m->snap_follows);
|
|
struct ceph_cap_snap *capsnap;
|
|
int drop = 0;
|
|
|
|
dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
|
|
inode, ci, session->s_mds, follows);
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
|
|
if (capsnap->follows == follows) {
|
|
if (capsnap->flush_tid != flush_tid) {
|
|
dout(" cap_snap %p follows %lld tid %lld !="
|
|
" %lld\n", capsnap, follows,
|
|
flush_tid, capsnap->flush_tid);
|
|
break;
|
|
}
|
|
WARN_ON(capsnap->dirty_pages || capsnap->writing);
|
|
dout(" removing %p cap_snap %p follows %lld\n",
|
|
inode, capsnap, follows);
|
|
ceph_put_snap_context(capsnap->context);
|
|
list_del(&capsnap->ci_item);
|
|
list_del(&capsnap->flushing_item);
|
|
ceph_put_cap_snap(capsnap);
|
|
wake_up_all(&mdsc->cap_flushing_wq);
|
|
drop = 1;
|
|
break;
|
|
} else {
|
|
dout(" skipping cap_snap %p follows %lld\n",
|
|
capsnap, capsnap->follows);
|
|
}
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (drop)
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* Handle TRUNC from MDS, indicating file truncation.
|
|
*
|
|
* caller hold s_mutex.
|
|
*/
|
|
static void handle_cap_trunc(struct inode *inode,
|
|
struct ceph_mds_caps *trunc,
|
|
struct ceph_mds_session *session)
|
|
__releases(ci->i_ceph_lock)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int mds = session->s_mds;
|
|
int seq = le32_to_cpu(trunc->seq);
|
|
u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
|
|
u64 truncate_size = le64_to_cpu(trunc->truncate_size);
|
|
u64 size = le64_to_cpu(trunc->size);
|
|
int implemented = 0;
|
|
int dirty = __ceph_caps_dirty(ci);
|
|
int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
|
|
int queue_trunc = 0;
|
|
|
|
issued |= implemented | dirty;
|
|
|
|
dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
|
|
inode, mds, seq, truncate_size, truncate_seq);
|
|
queue_trunc = ceph_fill_file_size(inode, issued,
|
|
truncate_seq, truncate_size, size);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (queue_trunc) {
|
|
ceph_queue_vmtruncate(inode);
|
|
ceph_fscache_invalidate(inode);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
|
|
* different one. If we are the most recent migration we've seen (as
|
|
* indicated by mseq), make note of the migrating cap bits for the
|
|
* duration (until we see the corresponding IMPORT).
|
|
*
|
|
* caller holds s_mutex
|
|
*/
|
|
static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
|
|
struct ceph_mds_cap_peer *ph,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
|
|
struct ceph_mds_session *tsession = NULL;
|
|
struct ceph_cap *cap, *tcap, *new_cap = NULL;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
u64 t_cap_id;
|
|
unsigned mseq = le32_to_cpu(ex->migrate_seq);
|
|
unsigned t_seq, t_mseq;
|
|
int target, issued;
|
|
int mds = session->s_mds;
|
|
|
|
if (ph) {
|
|
t_cap_id = le64_to_cpu(ph->cap_id);
|
|
t_seq = le32_to_cpu(ph->seq);
|
|
t_mseq = le32_to_cpu(ph->mseq);
|
|
target = le32_to_cpu(ph->mds);
|
|
} else {
|
|
t_cap_id = t_seq = t_mseq = 0;
|
|
target = -1;
|
|
}
|
|
|
|
dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n",
|
|
inode, ci, mds, mseq, target);
|
|
retry:
|
|
spin_lock(&ci->i_ceph_lock);
|
|
cap = __get_cap_for_mds(ci, mds);
|
|
if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id))
|
|
goto out_unlock;
|
|
|
|
if (target < 0) {
|
|
__ceph_remove_cap(cap, false);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* now we know we haven't received the cap import message yet
|
|
* because the exported cap still exist.
|
|
*/
|
|
|
|
issued = cap->issued;
|
|
WARN_ON(issued != cap->implemented);
|
|
|
|
tcap = __get_cap_for_mds(ci, target);
|
|
if (tcap) {
|
|
/* already have caps from the target */
|
|
if (tcap->cap_id != t_cap_id ||
|
|
ceph_seq_cmp(tcap->seq, t_seq) < 0) {
|
|
dout(" updating import cap %p mds%d\n", tcap, target);
|
|
tcap->cap_id = t_cap_id;
|
|
tcap->seq = t_seq - 1;
|
|
tcap->issue_seq = t_seq - 1;
|
|
tcap->mseq = t_mseq;
|
|
tcap->issued |= issued;
|
|
tcap->implemented |= issued;
|
|
if (cap == ci->i_auth_cap)
|
|
ci->i_auth_cap = tcap;
|
|
if (ci->i_flushing_caps && ci->i_auth_cap == tcap) {
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
list_move_tail(&ci->i_flushing_item,
|
|
&tcap->session->s_cap_flushing);
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
}
|
|
}
|
|
__ceph_remove_cap(cap, false);
|
|
goto out_unlock;
|
|
} else if (tsession) {
|
|
/* add placeholder for the export tagert */
|
|
int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;
|
|
ceph_add_cap(inode, tsession, t_cap_id, -1, issued, 0,
|
|
t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);
|
|
|
|
__ceph_remove_cap(cap, false);
|
|
goto out_unlock;
|
|
}
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
mutex_unlock(&session->s_mutex);
|
|
|
|
/* open target session */
|
|
tsession = ceph_mdsc_open_export_target_session(mdsc, target);
|
|
if (!IS_ERR(tsession)) {
|
|
if (mds > target) {
|
|
mutex_lock(&session->s_mutex);
|
|
mutex_lock_nested(&tsession->s_mutex,
|
|
SINGLE_DEPTH_NESTING);
|
|
} else {
|
|
mutex_lock(&tsession->s_mutex);
|
|
mutex_lock_nested(&session->s_mutex,
|
|
SINGLE_DEPTH_NESTING);
|
|
}
|
|
new_cap = ceph_get_cap(mdsc, NULL);
|
|
} else {
|
|
WARN_ON(1);
|
|
tsession = NULL;
|
|
target = -1;
|
|
}
|
|
goto retry;
|
|
|
|
out_unlock:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
mutex_unlock(&session->s_mutex);
|
|
if (tsession) {
|
|
mutex_unlock(&tsession->s_mutex);
|
|
ceph_put_mds_session(tsession);
|
|
}
|
|
if (new_cap)
|
|
ceph_put_cap(mdsc, new_cap);
|
|
}
|
|
|
|
/*
|
|
* Handle cap IMPORT.
|
|
*
|
|
* caller holds s_mutex. acquires i_ceph_lock
|
|
*/
|
|
static void handle_cap_import(struct ceph_mds_client *mdsc,
|
|
struct inode *inode, struct ceph_mds_caps *im,
|
|
struct ceph_mds_cap_peer *ph,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_cap **target_cap, int *old_issued)
|
|
__acquires(ci->i_ceph_lock)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_cap *cap, *ocap, *new_cap = NULL;
|
|
int mds = session->s_mds;
|
|
int issued;
|
|
unsigned caps = le32_to_cpu(im->caps);
|
|
unsigned wanted = le32_to_cpu(im->wanted);
|
|
unsigned seq = le32_to_cpu(im->seq);
|
|
unsigned mseq = le32_to_cpu(im->migrate_seq);
|
|
u64 realmino = le64_to_cpu(im->realm);
|
|
u64 cap_id = le64_to_cpu(im->cap_id);
|
|
u64 p_cap_id;
|
|
int peer;
|
|
|
|
if (ph) {
|
|
p_cap_id = le64_to_cpu(ph->cap_id);
|
|
peer = le32_to_cpu(ph->mds);
|
|
} else {
|
|
p_cap_id = 0;
|
|
peer = -1;
|
|
}
|
|
|
|
dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",
|
|
inode, ci, mds, mseq, peer);
|
|
|
|
retry:
|
|
spin_lock(&ci->i_ceph_lock);
|
|
cap = __get_cap_for_mds(ci, mds);
|
|
if (!cap) {
|
|
if (!new_cap) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
new_cap = ceph_get_cap(mdsc, NULL);
|
|
goto retry;
|
|
}
|
|
cap = new_cap;
|
|
} else {
|
|
if (new_cap) {
|
|
ceph_put_cap(mdsc, new_cap);
|
|
new_cap = NULL;
|
|
}
|
|
}
|
|
|
|
__ceph_caps_issued(ci, &issued);
|
|
issued |= __ceph_caps_dirty(ci);
|
|
|
|
ceph_add_cap(inode, session, cap_id, -1, caps, wanted, seq, mseq,
|
|
realmino, CEPH_CAP_FLAG_AUTH, &new_cap);
|
|
|
|
ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;
|
|
if (ocap && ocap->cap_id == p_cap_id) {
|
|
dout(" remove export cap %p mds%d flags %d\n",
|
|
ocap, peer, ph->flags);
|
|
if ((ph->flags & CEPH_CAP_FLAG_AUTH) &&
|
|
(ocap->seq != le32_to_cpu(ph->seq) ||
|
|
ocap->mseq != le32_to_cpu(ph->mseq))) {
|
|
pr_err("handle_cap_import: mismatched seq/mseq: "
|
|
"ino (%llx.%llx) mds%d seq %d mseq %d "
|
|
"importer mds%d has peer seq %d mseq %d\n",
|
|
ceph_vinop(inode), peer, ocap->seq,
|
|
ocap->mseq, mds, le32_to_cpu(ph->seq),
|
|
le32_to_cpu(ph->mseq));
|
|
}
|
|
__ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE));
|
|
}
|
|
|
|
/* make sure we re-request max_size, if necessary */
|
|
ci->i_wanted_max_size = 0;
|
|
ci->i_requested_max_size = 0;
|
|
|
|
*old_issued = issued;
|
|
*target_cap = cap;
|
|
}
|
|
|
|
/*
|
|
* Handle a caps message from the MDS.
|
|
*
|
|
* Identify the appropriate session, inode, and call the right handler
|
|
* based on the cap op.
|
|
*/
|
|
void ceph_handle_caps(struct ceph_mds_session *session,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_client *mdsc = session->s_mdsc;
|
|
struct super_block *sb = mdsc->fsc->sb;
|
|
struct inode *inode;
|
|
struct ceph_inode_info *ci;
|
|
struct ceph_cap *cap;
|
|
struct ceph_mds_caps *h;
|
|
struct ceph_mds_cap_peer *peer = NULL;
|
|
struct ceph_snap_realm *realm;
|
|
int mds = session->s_mds;
|
|
int op, issued;
|
|
u32 seq, mseq;
|
|
struct ceph_vino vino;
|
|
u64 cap_id;
|
|
u64 size, max_size;
|
|
u64 tid;
|
|
u64 inline_version = 0;
|
|
void *inline_data = NULL;
|
|
u32 inline_len = 0;
|
|
void *snaptrace;
|
|
size_t snaptrace_len;
|
|
void *p, *end;
|
|
|
|
dout("handle_caps from mds%d\n", mds);
|
|
|
|
/* decode */
|
|
end = msg->front.iov_base + msg->front.iov_len;
|
|
tid = le64_to_cpu(msg->hdr.tid);
|
|
if (msg->front.iov_len < sizeof(*h))
|
|
goto bad;
|
|
h = msg->front.iov_base;
|
|
op = le32_to_cpu(h->op);
|
|
vino.ino = le64_to_cpu(h->ino);
|
|
vino.snap = CEPH_NOSNAP;
|
|
cap_id = le64_to_cpu(h->cap_id);
|
|
seq = le32_to_cpu(h->seq);
|
|
mseq = le32_to_cpu(h->migrate_seq);
|
|
size = le64_to_cpu(h->size);
|
|
max_size = le64_to_cpu(h->max_size);
|
|
|
|
snaptrace = h + 1;
|
|
snaptrace_len = le32_to_cpu(h->snap_trace_len);
|
|
p = snaptrace + snaptrace_len;
|
|
|
|
if (le16_to_cpu(msg->hdr.version) >= 2) {
|
|
u32 flock_len;
|
|
ceph_decode_32_safe(&p, end, flock_len, bad);
|
|
if (p + flock_len > end)
|
|
goto bad;
|
|
p += flock_len;
|
|
}
|
|
|
|
if (le16_to_cpu(msg->hdr.version) >= 3) {
|
|
if (op == CEPH_CAP_OP_IMPORT) {
|
|
if (p + sizeof(*peer) > end)
|
|
goto bad;
|
|
peer = p;
|
|
p += sizeof(*peer);
|
|
} else if (op == CEPH_CAP_OP_EXPORT) {
|
|
/* recorded in unused fields */
|
|
peer = (void *)&h->size;
|
|
}
|
|
}
|
|
|
|
if (le16_to_cpu(msg->hdr.version) >= 4) {
|
|
ceph_decode_64_safe(&p, end, inline_version, bad);
|
|
ceph_decode_32_safe(&p, end, inline_len, bad);
|
|
if (p + inline_len > end)
|
|
goto bad;
|
|
inline_data = p;
|
|
p += inline_len;
|
|
}
|
|
|
|
/* lookup ino */
|
|
inode = ceph_find_inode(sb, vino);
|
|
ci = ceph_inode(inode);
|
|
dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
|
|
vino.snap, inode);
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
session->s_seq++;
|
|
dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
|
|
(unsigned)seq);
|
|
|
|
if (!inode) {
|
|
dout(" i don't have ino %llx\n", vino.ino);
|
|
|
|
if (op == CEPH_CAP_OP_IMPORT) {
|
|
cap = ceph_get_cap(mdsc, NULL);
|
|
cap->cap_ino = vino.ino;
|
|
cap->queue_release = 1;
|
|
cap->cap_id = cap_id;
|
|
cap->mseq = mseq;
|
|
cap->seq = seq;
|
|
spin_lock(&session->s_cap_lock);
|
|
list_add_tail(&cap->session_caps,
|
|
&session->s_cap_releases);
|
|
session->s_num_cap_releases++;
|
|
spin_unlock(&session->s_cap_lock);
|
|
}
|
|
goto flush_cap_releases;
|
|
}
|
|
|
|
/* these will work even if we don't have a cap yet */
|
|
switch (op) {
|
|
case CEPH_CAP_OP_FLUSHSNAP_ACK:
|
|
handle_cap_flushsnap_ack(inode, tid, h, session);
|
|
goto done;
|
|
|
|
case CEPH_CAP_OP_EXPORT:
|
|
handle_cap_export(inode, h, peer, session);
|
|
goto done_unlocked;
|
|
|
|
case CEPH_CAP_OP_IMPORT:
|
|
realm = NULL;
|
|
if (snaptrace_len) {
|
|
down_write(&mdsc->snap_rwsem);
|
|
ceph_update_snap_trace(mdsc, snaptrace,
|
|
snaptrace + snaptrace_len,
|
|
false, &realm);
|
|
downgrade_write(&mdsc->snap_rwsem);
|
|
} else {
|
|
down_read(&mdsc->snap_rwsem);
|
|
}
|
|
handle_cap_import(mdsc, inode, h, peer, session,
|
|
&cap, &issued);
|
|
handle_cap_grant(mdsc, inode, h,
|
|
inline_version, inline_data, inline_len,
|
|
msg->middle, session, cap, issued);
|
|
if (realm)
|
|
ceph_put_snap_realm(mdsc, realm);
|
|
goto done_unlocked;
|
|
}
|
|
|
|
/* the rest require a cap */
|
|
spin_lock(&ci->i_ceph_lock);
|
|
cap = __get_cap_for_mds(ceph_inode(inode), mds);
|
|
if (!cap) {
|
|
dout(" no cap on %p ino %llx.%llx from mds%d\n",
|
|
inode, ceph_ino(inode), ceph_snap(inode), mds);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
goto flush_cap_releases;
|
|
}
|
|
|
|
/* note that each of these drops i_ceph_lock for us */
|
|
switch (op) {
|
|
case CEPH_CAP_OP_REVOKE:
|
|
case CEPH_CAP_OP_GRANT:
|
|
__ceph_caps_issued(ci, &issued);
|
|
issued |= __ceph_caps_dirty(ci);
|
|
handle_cap_grant(mdsc, inode, h,
|
|
inline_version, inline_data, inline_len,
|
|
msg->middle, session, cap, issued);
|
|
goto done_unlocked;
|
|
|
|
case CEPH_CAP_OP_FLUSH_ACK:
|
|
handle_cap_flush_ack(inode, tid, h, session, cap);
|
|
break;
|
|
|
|
case CEPH_CAP_OP_TRUNC:
|
|
handle_cap_trunc(inode, h, session);
|
|
break;
|
|
|
|
default:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
|
|
ceph_cap_op_name(op));
|
|
}
|
|
|
|
goto done;
|
|
|
|
flush_cap_releases:
|
|
/*
|
|
* send any cap release message to try to move things
|
|
* along for the mds (who clearly thinks we still have this
|
|
* cap).
|
|
*/
|
|
ceph_send_cap_releases(mdsc, session);
|
|
|
|
done:
|
|
mutex_unlock(&session->s_mutex);
|
|
done_unlocked:
|
|
iput(inode);
|
|
return;
|
|
|
|
bad:
|
|
pr_err("ceph_handle_caps: corrupt message\n");
|
|
ceph_msg_dump(msg);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Delayed work handler to process end of delayed cap release LRU list.
|
|
*/
|
|
void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_inode_info *ci;
|
|
int flags = CHECK_CAPS_NODELAY;
|
|
|
|
dout("check_delayed_caps\n");
|
|
while (1) {
|
|
spin_lock(&mdsc->cap_delay_lock);
|
|
if (list_empty(&mdsc->cap_delay_list))
|
|
break;
|
|
ci = list_first_entry(&mdsc->cap_delay_list,
|
|
struct ceph_inode_info,
|
|
i_cap_delay_list);
|
|
if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
|
|
time_before(jiffies, ci->i_hold_caps_max))
|
|
break;
|
|
list_del_init(&ci->i_cap_delay_list);
|
|
spin_unlock(&mdsc->cap_delay_lock);
|
|
dout("check_delayed_caps on %p\n", &ci->vfs_inode);
|
|
ceph_check_caps(ci, flags, NULL);
|
|
}
|
|
spin_unlock(&mdsc->cap_delay_lock);
|
|
}
|
|
|
|
/*
|
|
* Flush all dirty caps to the mds
|
|
*/
|
|
void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_inode_info *ci;
|
|
struct inode *inode;
|
|
|
|
dout("flush_dirty_caps\n");
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
while (!list_empty(&mdsc->cap_dirty)) {
|
|
ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info,
|
|
i_dirty_item);
|
|
inode = &ci->vfs_inode;
|
|
ihold(inode);
|
|
dout("flush_dirty_caps %p\n", inode);
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL);
|
|
iput(inode);
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
dout("flush_dirty_caps done\n");
|
|
}
|
|
|
|
/*
|
|
* Drop open file reference. If we were the last open file,
|
|
* we may need to release capabilities to the MDS (or schedule
|
|
* their delayed release).
|
|
*/
|
|
void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int last = 0;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
|
|
ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
|
|
BUG_ON(ci->i_nr_by_mode[fmode] == 0);
|
|
if (--ci->i_nr_by_mode[fmode] == 0)
|
|
last++;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (last && ci->i_vino.snap == CEPH_NOSNAP)
|
|
ceph_check_caps(ci, 0, NULL);
|
|
}
|
|
|
|
/*
|
|
* Helpers for embedding cap and dentry lease releases into mds
|
|
* requests.
|
|
*
|
|
* @force is used by dentry_release (below) to force inclusion of a
|
|
* record for the directory inode, even when there aren't any caps to
|
|
* drop.
|
|
*/
|
|
int ceph_encode_inode_release(void **p, struct inode *inode,
|
|
int mds, int drop, int unless, int force)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_cap *cap;
|
|
struct ceph_mds_request_release *rel = *p;
|
|
int used, dirty;
|
|
int ret = 0;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
used = __ceph_caps_used(ci);
|
|
dirty = __ceph_caps_dirty(ci);
|
|
|
|
dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
|
|
inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
|
|
ceph_cap_string(unless));
|
|
|
|
/* only drop unused, clean caps */
|
|
drop &= ~(used | dirty);
|
|
|
|
cap = __get_cap_for_mds(ci, mds);
|
|
if (cap && __cap_is_valid(cap)) {
|
|
if (force ||
|
|
((cap->issued & drop) &&
|
|
(cap->issued & unless) == 0)) {
|
|
if ((cap->issued & drop) &&
|
|
(cap->issued & unless) == 0) {
|
|
int wanted = __ceph_caps_wanted(ci);
|
|
if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0)
|
|
wanted |= cap->mds_wanted;
|
|
dout("encode_inode_release %p cap %p "
|
|
"%s -> %s, wanted %s -> %s\n", inode, cap,
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(cap->issued & ~drop),
|
|
ceph_cap_string(cap->mds_wanted),
|
|
ceph_cap_string(wanted));
|
|
|
|
cap->issued &= ~drop;
|
|
cap->implemented &= ~drop;
|
|
cap->mds_wanted = wanted;
|
|
} else {
|
|
dout("encode_inode_release %p cap %p %s"
|
|
" (force)\n", inode, cap,
|
|
ceph_cap_string(cap->issued));
|
|
}
|
|
|
|
rel->ino = cpu_to_le64(ceph_ino(inode));
|
|
rel->cap_id = cpu_to_le64(cap->cap_id);
|
|
rel->seq = cpu_to_le32(cap->seq);
|
|
rel->issue_seq = cpu_to_le32(cap->issue_seq);
|
|
rel->mseq = cpu_to_le32(cap->mseq);
|
|
rel->caps = cpu_to_le32(cap->implemented);
|
|
rel->wanted = cpu_to_le32(cap->mds_wanted);
|
|
rel->dname_len = 0;
|
|
rel->dname_seq = 0;
|
|
*p += sizeof(*rel);
|
|
ret = 1;
|
|
} else {
|
|
dout("encode_inode_release %p cap %p %s\n",
|
|
inode, cap, ceph_cap_string(cap->issued));
|
|
}
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return ret;
|
|
}
|
|
|
|
int ceph_encode_dentry_release(void **p, struct dentry *dentry,
|
|
int mds, int drop, int unless)
|
|
{
|
|
struct inode *dir = d_inode(dentry->d_parent);
|
|
struct ceph_mds_request_release *rel = *p;
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
int force = 0;
|
|
int ret;
|
|
|
|
/*
|
|
* force an record for the directory caps if we have a dentry lease.
|
|
* this is racy (can't take i_ceph_lock and d_lock together), but it
|
|
* doesn't have to be perfect; the mds will revoke anything we don't
|
|
* release.
|
|
*/
|
|
spin_lock(&dentry->d_lock);
|
|
if (di->lease_session && di->lease_session->s_mds == mds)
|
|
force = 1;
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
if (ret && di->lease_session && di->lease_session->s_mds == mds) {
|
|
dout("encode_dentry_release %p mds%d seq %d\n",
|
|
dentry, mds, (int)di->lease_seq);
|
|
rel->dname_len = cpu_to_le32(dentry->d_name.len);
|
|
memcpy(*p, dentry->d_name.name, dentry->d_name.len);
|
|
*p += dentry->d_name.len;
|
|
rel->dname_seq = cpu_to_le32(di->lease_seq);
|
|
__ceph_mdsc_drop_dentry_lease(dentry);
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
return ret;
|
|
}
|