![Sage Weil](/assets/img/avatar_default.png)
The iterate_session_caps helper traverses the session caps list and tries to grab an inode reference. However, the __ceph_remove_cap was clearing the inode backpointer _before_ removing itself from the session list, causing a null pointer dereference. Clear cap->ci under protection of s_cap_lock to avoid the race, and to tightly couple the list and backpointer state. Use a local flag to indicate whether we are releasing the cap, as cap->session may be modified by a racing thread in iterate_session_caps. Signed-off-by: Sage Weil <sage@newdream.net>
3048 lines
76 KiB
C
3048 lines
76 KiB
C
#include "ceph_debug.h"
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#include <linux/wait.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include "mds_client.h"
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#include "mon_client.h"
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#include "super.h"
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#include "messenger.h"
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#include "decode.h"
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#include "auth.h"
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#include "pagelist.h"
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/*
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* A cluster of MDS (metadata server) daemons is responsible for
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* managing the file system namespace (the directory hierarchy and
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* inodes) and for coordinating shared access to storage. Metadata is
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* partitioning hierarchically across a number of servers, and that
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* partition varies over time as the cluster adjusts the distribution
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* in order to balance load.
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*
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* The MDS client is primarily responsible to managing synchronous
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* metadata requests for operations like open, unlink, and so forth.
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* If there is a MDS failure, we find out about it when we (possibly
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* request and) receive a new MDS map, and can resubmit affected
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* requests.
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*
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* For the most part, though, we take advantage of a lossless
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* communications channel to the MDS, and do not need to worry about
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* timing out or resubmitting requests.
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*
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* We maintain a stateful "session" with each MDS we interact with.
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* Within each session, we sent periodic heartbeat messages to ensure
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* any capabilities or leases we have been issues remain valid. If
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* the session times out and goes stale, our leases and capabilities
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* are no longer valid.
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*/
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static void __wake_requests(struct ceph_mds_client *mdsc,
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struct list_head *head);
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const static struct ceph_connection_operations mds_con_ops;
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/*
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* mds reply parsing
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*/
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/*
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* parse individual inode info
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*/
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static int parse_reply_info_in(void **p, void *end,
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struct ceph_mds_reply_info_in *info)
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{
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int err = -EIO;
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info->in = *p;
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*p += sizeof(struct ceph_mds_reply_inode) +
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sizeof(*info->in->fragtree.splits) *
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le32_to_cpu(info->in->fragtree.nsplits);
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ceph_decode_32_safe(p, end, info->symlink_len, bad);
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ceph_decode_need(p, end, info->symlink_len, bad);
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info->symlink = *p;
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*p += info->symlink_len;
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ceph_decode_32_safe(p, end, info->xattr_len, bad);
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ceph_decode_need(p, end, info->xattr_len, bad);
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info->xattr_data = *p;
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*p += info->xattr_len;
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return 0;
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bad:
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return err;
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}
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/*
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* parse a normal reply, which may contain a (dir+)dentry and/or a
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* target inode.
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*/
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static int parse_reply_info_trace(void **p, void *end,
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struct ceph_mds_reply_info_parsed *info)
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{
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int err;
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if (info->head->is_dentry) {
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err = parse_reply_info_in(p, end, &info->diri);
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if (err < 0)
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goto out_bad;
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if (unlikely(*p + sizeof(*info->dirfrag) > end))
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goto bad;
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info->dirfrag = *p;
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*p += sizeof(*info->dirfrag) +
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sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
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if (unlikely(*p > end))
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goto bad;
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ceph_decode_32_safe(p, end, info->dname_len, bad);
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ceph_decode_need(p, end, info->dname_len, bad);
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info->dname = *p;
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*p += info->dname_len;
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info->dlease = *p;
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*p += sizeof(*info->dlease);
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}
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if (info->head->is_target) {
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err = parse_reply_info_in(p, end, &info->targeti);
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if (err < 0)
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goto out_bad;
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}
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if (unlikely(*p != end))
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goto bad;
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return 0;
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bad:
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err = -EIO;
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out_bad:
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pr_err("problem parsing mds trace %d\n", err);
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return err;
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}
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/*
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* parse readdir results
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*/
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static int parse_reply_info_dir(void **p, void *end,
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struct ceph_mds_reply_info_parsed *info)
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{
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u32 num, i = 0;
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int err;
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info->dir_dir = *p;
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if (*p + sizeof(*info->dir_dir) > end)
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goto bad;
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*p += sizeof(*info->dir_dir) +
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sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
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if (*p > end)
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goto bad;
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ceph_decode_need(p, end, sizeof(num) + 2, bad);
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num = ceph_decode_32(p);
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info->dir_end = ceph_decode_8(p);
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info->dir_complete = ceph_decode_8(p);
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if (num == 0)
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goto done;
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/* alloc large array */
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info->dir_nr = num;
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info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
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sizeof(*info->dir_dname) +
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sizeof(*info->dir_dname_len) +
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sizeof(*info->dir_dlease),
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GFP_NOFS);
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if (info->dir_in == NULL) {
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err = -ENOMEM;
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goto out_bad;
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}
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info->dir_dname = (void *)(info->dir_in + num);
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info->dir_dname_len = (void *)(info->dir_dname + num);
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info->dir_dlease = (void *)(info->dir_dname_len + num);
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while (num) {
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/* dentry */
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ceph_decode_need(p, end, sizeof(u32)*2, bad);
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info->dir_dname_len[i] = ceph_decode_32(p);
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ceph_decode_need(p, end, info->dir_dname_len[i], bad);
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info->dir_dname[i] = *p;
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*p += info->dir_dname_len[i];
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dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
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info->dir_dname[i]);
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info->dir_dlease[i] = *p;
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*p += sizeof(struct ceph_mds_reply_lease);
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/* inode */
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err = parse_reply_info_in(p, end, &info->dir_in[i]);
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if (err < 0)
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goto out_bad;
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i++;
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num--;
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}
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done:
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if (*p != end)
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goto bad;
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return 0;
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bad:
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err = -EIO;
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out_bad:
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pr_err("problem parsing dir contents %d\n", err);
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return err;
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}
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/*
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* parse entire mds reply
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*/
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static int parse_reply_info(struct ceph_msg *msg,
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struct ceph_mds_reply_info_parsed *info)
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{
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void *p, *end;
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u32 len;
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int err;
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info->head = msg->front.iov_base;
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p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
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end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
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/* trace */
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ceph_decode_32_safe(&p, end, len, bad);
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if (len > 0) {
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err = parse_reply_info_trace(&p, p+len, info);
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if (err < 0)
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goto out_bad;
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}
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/* dir content */
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ceph_decode_32_safe(&p, end, len, bad);
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if (len > 0) {
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err = parse_reply_info_dir(&p, p+len, info);
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if (err < 0)
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goto out_bad;
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}
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/* snap blob */
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ceph_decode_32_safe(&p, end, len, bad);
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info->snapblob_len = len;
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info->snapblob = p;
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p += len;
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if (p != end)
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goto bad;
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return 0;
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bad:
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err = -EIO;
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out_bad:
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pr_err("mds parse_reply err %d\n", err);
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return err;
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}
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static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
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{
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kfree(info->dir_in);
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}
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/*
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* sessions
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*/
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static const char *session_state_name(int s)
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{
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switch (s) {
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case CEPH_MDS_SESSION_NEW: return "new";
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case CEPH_MDS_SESSION_OPENING: return "opening";
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case CEPH_MDS_SESSION_OPEN: return "open";
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case CEPH_MDS_SESSION_HUNG: return "hung";
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case CEPH_MDS_SESSION_CLOSING: return "closing";
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case CEPH_MDS_SESSION_RESTARTING: return "restarting";
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case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
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default: return "???";
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}
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}
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static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
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{
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if (atomic_inc_not_zero(&s->s_ref)) {
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dout("mdsc get_session %p %d -> %d\n", s,
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atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
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return s;
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} else {
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dout("mdsc get_session %p 0 -- FAIL", s);
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return NULL;
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}
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}
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void ceph_put_mds_session(struct ceph_mds_session *s)
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{
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dout("mdsc put_session %p %d -> %d\n", s,
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atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
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if (atomic_dec_and_test(&s->s_ref)) {
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if (s->s_authorizer)
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s->s_mdsc->client->monc.auth->ops->destroy_authorizer(
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s->s_mdsc->client->monc.auth, s->s_authorizer);
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kfree(s);
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}
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}
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/*
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* called under mdsc->mutex
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*/
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struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
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int mds)
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{
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struct ceph_mds_session *session;
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if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
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return NULL;
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session = mdsc->sessions[mds];
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dout("lookup_mds_session %p %d\n", session,
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atomic_read(&session->s_ref));
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get_session(session);
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return session;
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}
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static bool __have_session(struct ceph_mds_client *mdsc, int mds)
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{
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if (mds >= mdsc->max_sessions)
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return false;
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return mdsc->sessions[mds];
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}
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static int __verify_registered_session(struct ceph_mds_client *mdsc,
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struct ceph_mds_session *s)
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{
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if (s->s_mds >= mdsc->max_sessions ||
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mdsc->sessions[s->s_mds] != s)
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return -ENOENT;
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return 0;
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}
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/*
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* create+register a new session for given mds.
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* called under mdsc->mutex.
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*/
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static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
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int mds)
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{
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struct ceph_mds_session *s;
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s = kzalloc(sizeof(*s), GFP_NOFS);
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if (!s)
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return ERR_PTR(-ENOMEM);
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s->s_mdsc = mdsc;
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s->s_mds = mds;
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s->s_state = CEPH_MDS_SESSION_NEW;
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s->s_ttl = 0;
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s->s_seq = 0;
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mutex_init(&s->s_mutex);
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ceph_con_init(mdsc->client->msgr, &s->s_con);
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s->s_con.private = s;
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s->s_con.ops = &mds_con_ops;
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s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS;
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s->s_con.peer_name.num = cpu_to_le64(mds);
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spin_lock_init(&s->s_cap_lock);
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s->s_cap_gen = 0;
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s->s_cap_ttl = 0;
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s->s_renew_requested = 0;
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s->s_renew_seq = 0;
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INIT_LIST_HEAD(&s->s_caps);
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s->s_nr_caps = 0;
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s->s_trim_caps = 0;
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atomic_set(&s->s_ref, 1);
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INIT_LIST_HEAD(&s->s_waiting);
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INIT_LIST_HEAD(&s->s_unsafe);
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s->s_num_cap_releases = 0;
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s->s_cap_iterator = NULL;
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INIT_LIST_HEAD(&s->s_cap_releases);
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INIT_LIST_HEAD(&s->s_cap_releases_done);
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INIT_LIST_HEAD(&s->s_cap_flushing);
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INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
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dout("register_session mds%d\n", mds);
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if (mds >= mdsc->max_sessions) {
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int newmax = 1 << get_count_order(mds+1);
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struct ceph_mds_session **sa;
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dout("register_session realloc to %d\n", newmax);
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sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
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if (sa == NULL)
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goto fail_realloc;
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if (mdsc->sessions) {
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memcpy(sa, mdsc->sessions,
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mdsc->max_sessions * sizeof(void *));
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kfree(mdsc->sessions);
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}
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mdsc->sessions = sa;
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mdsc->max_sessions = newmax;
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}
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mdsc->sessions[mds] = s;
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atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
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ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
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return s;
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fail_realloc:
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kfree(s);
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return ERR_PTR(-ENOMEM);
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}
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/*
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* called under mdsc->mutex
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*/
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static void __unregister_session(struct ceph_mds_client *mdsc,
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struct ceph_mds_session *s)
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{
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dout("__unregister_session mds%d %p\n", s->s_mds, s);
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BUG_ON(mdsc->sessions[s->s_mds] != s);
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mdsc->sessions[s->s_mds] = NULL;
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ceph_con_close(&s->s_con);
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ceph_put_mds_session(s);
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}
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/*
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* drop session refs in request.
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*
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* should be last request ref, or hold mdsc->mutex
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*/
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static void put_request_session(struct ceph_mds_request *req)
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{
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if (req->r_session) {
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ceph_put_mds_session(req->r_session);
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req->r_session = NULL;
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}
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}
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void ceph_mdsc_release_request(struct kref *kref)
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{
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struct ceph_mds_request *req = container_of(kref,
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struct ceph_mds_request,
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r_kref);
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if (req->r_request)
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ceph_msg_put(req->r_request);
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if (req->r_reply) {
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ceph_msg_put(req->r_reply);
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destroy_reply_info(&req->r_reply_info);
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}
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if (req->r_inode) {
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ceph_put_cap_refs(ceph_inode(req->r_inode),
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CEPH_CAP_PIN);
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iput(req->r_inode);
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}
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if (req->r_locked_dir)
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ceph_put_cap_refs(ceph_inode(req->r_locked_dir),
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CEPH_CAP_PIN);
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if (req->r_target_inode)
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iput(req->r_target_inode);
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if (req->r_dentry)
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dput(req->r_dentry);
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if (req->r_old_dentry) {
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ceph_put_cap_refs(
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ceph_inode(req->r_old_dentry->d_parent->d_inode),
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CEPH_CAP_PIN);
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dput(req->r_old_dentry);
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}
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kfree(req->r_path1);
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kfree(req->r_path2);
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put_request_session(req);
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ceph_unreserve_caps(&req->r_caps_reservation);
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kfree(req);
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}
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|
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/*
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* lookup session, bump ref if found.
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*
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* called under mdsc->mutex.
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*/
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static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
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u64 tid)
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{
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struct ceph_mds_request *req;
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struct rb_node *n = mdsc->request_tree.rb_node;
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while (n) {
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req = rb_entry(n, struct ceph_mds_request, r_node);
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if (tid < req->r_tid)
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n = n->rb_left;
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else if (tid > req->r_tid)
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n = n->rb_right;
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else {
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ceph_mdsc_get_request(req);
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return req;
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}
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}
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return NULL;
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}
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static void __insert_request(struct ceph_mds_client *mdsc,
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struct ceph_mds_request *new)
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{
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struct rb_node **p = &mdsc->request_tree.rb_node;
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struct rb_node *parent = NULL;
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struct ceph_mds_request *req = NULL;
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while (*p) {
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parent = *p;
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req = rb_entry(parent, struct ceph_mds_request, r_node);
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if (new->r_tid < req->r_tid)
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p = &(*p)->rb_left;
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else if (new->r_tid > req->r_tid)
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p = &(*p)->rb_right;
|
|
else
|
|
BUG();
|
|
}
|
|
|
|
rb_link_node(&new->r_node, parent, p);
|
|
rb_insert_color(&new->r_node, &mdsc->request_tree);
|
|
}
|
|
|
|
/*
|
|
* Register an in-flight request, and assign a tid. Link to directory
|
|
* are modifying (if any).
|
|
*
|
|
* Called under mdsc->mutex.
|
|
*/
|
|
static void __register_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req,
|
|
struct inode *dir)
|
|
{
|
|
req->r_tid = ++mdsc->last_tid;
|
|
if (req->r_num_caps)
|
|
ceph_reserve_caps(&req->r_caps_reservation, req->r_num_caps);
|
|
dout("__register_request %p tid %lld\n", req, req->r_tid);
|
|
ceph_mdsc_get_request(req);
|
|
__insert_request(mdsc, req);
|
|
|
|
if (dir) {
|
|
struct ceph_inode_info *ci = ceph_inode(dir);
|
|
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
req->r_unsafe_dir = dir;
|
|
list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
}
|
|
}
|
|
|
|
static void __unregister_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
dout("__unregister_request %p tid %lld\n", req, req->r_tid);
|
|
rb_erase(&req->r_node, &mdsc->request_tree);
|
|
RB_CLEAR_NODE(&req->r_node);
|
|
|
|
if (req->r_unsafe_dir) {
|
|
struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
|
|
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
list_del_init(&req->r_unsafe_dir_item);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
}
|
|
|
|
ceph_mdsc_put_request(req);
|
|
}
|
|
|
|
/*
|
|
* Choose mds to send request to next. If there is a hint set in the
|
|
* request (e.g., due to a prior forward hint from the mds), use that.
|
|
* Otherwise, consult frag tree and/or caps to identify the
|
|
* appropriate mds. If all else fails, choose randomly.
|
|
*
|
|
* Called under mdsc->mutex.
|
|
*/
|
|
static int __choose_mds(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
struct inode *inode;
|
|
struct ceph_inode_info *ci;
|
|
struct ceph_cap *cap;
|
|
int mode = req->r_direct_mode;
|
|
int mds = -1;
|
|
u32 hash = req->r_direct_hash;
|
|
bool is_hash = req->r_direct_is_hash;
|
|
|
|
/*
|
|
* is there a specific mds we should try? ignore hint if we have
|
|
* no session and the mds is not up (active or recovering).
|
|
*/
|
|
if (req->r_resend_mds >= 0 &&
|
|
(__have_session(mdsc, req->r_resend_mds) ||
|
|
ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
|
|
dout("choose_mds using resend_mds mds%d\n",
|
|
req->r_resend_mds);
|
|
return req->r_resend_mds;
|
|
}
|
|
|
|
if (mode == USE_RANDOM_MDS)
|
|
goto random;
|
|
|
|
inode = NULL;
|
|
if (req->r_inode) {
|
|
inode = req->r_inode;
|
|
} else if (req->r_dentry) {
|
|
if (req->r_dentry->d_inode) {
|
|
inode = req->r_dentry->d_inode;
|
|
} else {
|
|
inode = req->r_dentry->d_parent->d_inode;
|
|
hash = req->r_dentry->d_name.hash;
|
|
is_hash = true;
|
|
}
|
|
}
|
|
dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
|
|
(int)hash, mode);
|
|
if (!inode)
|
|
goto random;
|
|
ci = ceph_inode(inode);
|
|
|
|
if (is_hash && S_ISDIR(inode->i_mode)) {
|
|
struct ceph_inode_frag frag;
|
|
int found;
|
|
|
|
ceph_choose_frag(ci, hash, &frag, &found);
|
|
if (found) {
|
|
if (mode == USE_ANY_MDS && frag.ndist > 0) {
|
|
u8 r;
|
|
|
|
/* choose a random replica */
|
|
get_random_bytes(&r, 1);
|
|
r %= frag.ndist;
|
|
mds = frag.dist[r];
|
|
dout("choose_mds %p %llx.%llx "
|
|
"frag %u mds%d (%d/%d)\n",
|
|
inode, ceph_vinop(inode),
|
|
frag.frag, frag.mds,
|
|
(int)r, frag.ndist);
|
|
return mds;
|
|
}
|
|
|
|
/* since this file/dir wasn't known to be
|
|
* replicated, then we want to look for the
|
|
* authoritative mds. */
|
|
mode = USE_AUTH_MDS;
|
|
if (frag.mds >= 0) {
|
|
/* choose auth mds */
|
|
mds = frag.mds;
|
|
dout("choose_mds %p %llx.%llx "
|
|
"frag %u mds%d (auth)\n",
|
|
inode, ceph_vinop(inode), frag.frag, mds);
|
|
return mds;
|
|
}
|
|
}
|
|
}
|
|
|
|
spin_lock(&inode->i_lock);
|
|
cap = NULL;
|
|
if (mode == USE_AUTH_MDS)
|
|
cap = ci->i_auth_cap;
|
|
if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
|
|
cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
|
|
if (!cap) {
|
|
spin_unlock(&inode->i_lock);
|
|
goto random;
|
|
}
|
|
mds = cap->session->s_mds;
|
|
dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
|
|
inode, ceph_vinop(inode), mds,
|
|
cap == ci->i_auth_cap ? "auth " : "", cap);
|
|
spin_unlock(&inode->i_lock);
|
|
return mds;
|
|
|
|
random:
|
|
mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
|
|
dout("choose_mds chose random mds%d\n", mds);
|
|
return mds;
|
|
}
|
|
|
|
|
|
/*
|
|
* session messages
|
|
*/
|
|
static struct ceph_msg *create_session_msg(u32 op, u64 seq)
|
|
{
|
|
struct ceph_msg *msg;
|
|
struct ceph_mds_session_head *h;
|
|
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), 0, 0, NULL);
|
|
if (IS_ERR(msg)) {
|
|
pr_err("create_session_msg ENOMEM creating msg\n");
|
|
return ERR_PTR(PTR_ERR(msg));
|
|
}
|
|
h = msg->front.iov_base;
|
|
h->op = cpu_to_le32(op);
|
|
h->seq = cpu_to_le64(seq);
|
|
return msg;
|
|
}
|
|
|
|
/*
|
|
* send session open request.
|
|
*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static int __open_session(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *msg;
|
|
int mstate;
|
|
int mds = session->s_mds;
|
|
int err = 0;
|
|
|
|
/* wait for mds to go active? */
|
|
mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
|
|
dout("open_session to mds%d (%s)\n", mds,
|
|
ceph_mds_state_name(mstate));
|
|
session->s_state = CEPH_MDS_SESSION_OPENING;
|
|
session->s_renew_requested = jiffies;
|
|
|
|
/* send connect message */
|
|
msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
|
|
if (IS_ERR(msg)) {
|
|
err = PTR_ERR(msg);
|
|
goto out;
|
|
}
|
|
ceph_con_send(&session->s_con, msg);
|
|
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* session caps
|
|
*/
|
|
|
|
/*
|
|
* Free preallocated cap messages assigned to this session
|
|
*/
|
|
static void cleanup_cap_releases(struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *msg;
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
while (!list_empty(&session->s_cap_releases)) {
|
|
msg = list_first_entry(&session->s_cap_releases,
|
|
struct ceph_msg, list_head);
|
|
list_del_init(&msg->list_head);
|
|
ceph_msg_put(msg);
|
|
}
|
|
while (!list_empty(&session->s_cap_releases_done)) {
|
|
msg = list_first_entry(&session->s_cap_releases_done,
|
|
struct ceph_msg, list_head);
|
|
list_del_init(&msg->list_head);
|
|
ceph_msg_put(msg);
|
|
}
|
|
spin_unlock(&session->s_cap_lock);
|
|
}
|
|
|
|
/*
|
|
* Helper to safely iterate over all caps associated with a session, with
|
|
* special care taken to handle a racing __ceph_remove_cap().
|
|
*
|
|
* Caller must hold session s_mutex.
|
|
*/
|
|
static int iterate_session_caps(struct ceph_mds_session *session,
|
|
int (*cb)(struct inode *, struct ceph_cap *,
|
|
void *), void *arg)
|
|
{
|
|
struct list_head *p;
|
|
struct ceph_cap *cap;
|
|
struct inode *inode, *last_inode = NULL;
|
|
struct ceph_cap *old_cap = NULL;
|
|
int ret;
|
|
|
|
dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
|
|
spin_lock(&session->s_cap_lock);
|
|
p = session->s_caps.next;
|
|
while (p != &session->s_caps) {
|
|
cap = list_entry(p, struct ceph_cap, session_caps);
|
|
inode = igrab(&cap->ci->vfs_inode);
|
|
if (!inode) {
|
|
p = p->next;
|
|
continue;
|
|
}
|
|
session->s_cap_iterator = cap;
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
if (last_inode) {
|
|
iput(last_inode);
|
|
last_inode = NULL;
|
|
}
|
|
if (old_cap) {
|
|
ceph_put_cap(old_cap);
|
|
old_cap = NULL;
|
|
}
|
|
|
|
ret = cb(inode, cap, arg);
|
|
last_inode = inode;
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
p = p->next;
|
|
if (cap->ci == NULL) {
|
|
dout("iterate_session_caps finishing cap %p removal\n",
|
|
cap);
|
|
BUG_ON(cap->session != session);
|
|
list_del_init(&cap->session_caps);
|
|
session->s_nr_caps--;
|
|
cap->session = NULL;
|
|
old_cap = cap; /* put_cap it w/o locks held */
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
session->s_cap_iterator = NULL;
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
if (last_inode)
|
|
iput(last_inode);
|
|
if (old_cap)
|
|
ceph_put_cap(old_cap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
|
|
void *arg)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
dout("removing cap %p, ci is %p, inode is %p\n",
|
|
cap, ci, &ci->vfs_inode);
|
|
ceph_remove_cap(cap);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* caller must hold session s_mutex
|
|
*/
|
|
static void remove_session_caps(struct ceph_mds_session *session)
|
|
{
|
|
dout("remove_session_caps on %p\n", session);
|
|
iterate_session_caps(session, remove_session_caps_cb, NULL);
|
|
BUG_ON(session->s_nr_caps > 0);
|
|
cleanup_cap_releases(session);
|
|
}
|
|
|
|
/*
|
|
* wake up any threads waiting on this session's caps. if the cap is
|
|
* old (didn't get renewed on the client reconnect), remove it now.
|
|
*
|
|
* caller must hold s_mutex.
|
|
*/
|
|
static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
|
|
void *arg)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
|
|
wake_up(&ci->i_cap_wq);
|
|
if (arg) {
|
|
spin_lock(&inode->i_lock);
|
|
ci->i_wanted_max_size = 0;
|
|
ci->i_requested_max_size = 0;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void wake_up_session_caps(struct ceph_mds_session *session,
|
|
int reconnect)
|
|
{
|
|
dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
|
|
iterate_session_caps(session, wake_up_session_cb,
|
|
(void *)(unsigned long)reconnect);
|
|
}
|
|
|
|
/*
|
|
* Send periodic message to MDS renewing all currently held caps. The
|
|
* ack will reset the expiration for all caps from this session.
|
|
*
|
|
* caller holds s_mutex
|
|
*/
|
|
static int send_renew_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *msg;
|
|
int state;
|
|
|
|
if (time_after_eq(jiffies, session->s_cap_ttl) &&
|
|
time_after_eq(session->s_cap_ttl, session->s_renew_requested))
|
|
pr_info("mds%d caps stale\n", session->s_mds);
|
|
session->s_renew_requested = jiffies;
|
|
|
|
/* do not try to renew caps until a recovering mds has reconnected
|
|
* with its clients. */
|
|
state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
|
|
if (state < CEPH_MDS_STATE_RECONNECT) {
|
|
dout("send_renew_caps ignoring mds%d (%s)\n",
|
|
session->s_mds, ceph_mds_state_name(state));
|
|
return 0;
|
|
}
|
|
|
|
dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
|
|
ceph_mds_state_name(state));
|
|
msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
|
|
++session->s_renew_seq);
|
|
if (IS_ERR(msg))
|
|
return PTR_ERR(msg);
|
|
ceph_con_send(&session->s_con, msg);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Note new cap ttl, and any transition from stale -> not stale (fresh?).
|
|
*
|
|
* Called under session->s_mutex
|
|
*/
|
|
static void renewed_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session, int is_renew)
|
|
{
|
|
int was_stale;
|
|
int wake = 0;
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
was_stale = is_renew && (session->s_cap_ttl == 0 ||
|
|
time_after_eq(jiffies, session->s_cap_ttl));
|
|
|
|
session->s_cap_ttl = session->s_renew_requested +
|
|
mdsc->mdsmap->m_session_timeout*HZ;
|
|
|
|
if (was_stale) {
|
|
if (time_before(jiffies, session->s_cap_ttl)) {
|
|
pr_info("mds%d caps renewed\n", session->s_mds);
|
|
wake = 1;
|
|
} else {
|
|
pr_info("mds%d caps still stale\n", session->s_mds);
|
|
}
|
|
}
|
|
dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
|
|
session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
|
|
time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
if (wake)
|
|
wake_up_session_caps(session, 0);
|
|
}
|
|
|
|
/*
|
|
* send a session close request
|
|
*/
|
|
static int request_close_session(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *msg;
|
|
int err = 0;
|
|
|
|
dout("request_close_session mds%d state %s seq %lld\n",
|
|
session->s_mds, session_state_name(session->s_state),
|
|
session->s_seq);
|
|
msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
|
|
if (IS_ERR(msg))
|
|
err = PTR_ERR(msg);
|
|
else
|
|
ceph_con_send(&session->s_con, msg);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Called with s_mutex held.
|
|
*/
|
|
static int __close_session(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
|
|
return 0;
|
|
session->s_state = CEPH_MDS_SESSION_CLOSING;
|
|
return request_close_session(mdsc, session);
|
|
}
|
|
|
|
/*
|
|
* Trim old(er) caps.
|
|
*
|
|
* Because we can't cache an inode without one or more caps, we do
|
|
* this indirectly: if a cap is unused, we prune its aliases, at which
|
|
* point the inode will hopefully get dropped to.
|
|
*
|
|
* Yes, this is a bit sloppy. Our only real goal here is to respond to
|
|
* memory pressure from the MDS, though, so it needn't be perfect.
|
|
*/
|
|
static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
|
|
{
|
|
struct ceph_mds_session *session = arg;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int used, oissued, mine;
|
|
|
|
if (session->s_trim_caps <= 0)
|
|
return -1;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
mine = cap->issued | cap->implemented;
|
|
used = __ceph_caps_used(ci);
|
|
oissued = __ceph_caps_issued_other(ci, cap);
|
|
|
|
dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
|
|
inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
|
|
ceph_cap_string(used));
|
|
if (ci->i_dirty_caps)
|
|
goto out; /* dirty caps */
|
|
if ((used & ~oissued) & mine)
|
|
goto out; /* we need these caps */
|
|
|
|
session->s_trim_caps--;
|
|
if (oissued) {
|
|
/* we aren't the only cap.. just remove us */
|
|
__ceph_remove_cap(cap);
|
|
} else {
|
|
/* try to drop referring dentries */
|
|
spin_unlock(&inode->i_lock);
|
|
d_prune_aliases(inode);
|
|
dout("trim_caps_cb %p cap %p pruned, count now %d\n",
|
|
inode, cap, atomic_read(&inode->i_count));
|
|
return 0;
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&inode->i_lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Trim session cap count down to some max number.
|
|
*/
|
|
static int trim_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
int max_caps)
|
|
{
|
|
int trim_caps = session->s_nr_caps - max_caps;
|
|
|
|
dout("trim_caps mds%d start: %d / %d, trim %d\n",
|
|
session->s_mds, session->s_nr_caps, max_caps, trim_caps);
|
|
if (trim_caps > 0) {
|
|
session->s_trim_caps = trim_caps;
|
|
iterate_session_caps(session, trim_caps_cb, session);
|
|
dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
|
|
session->s_mds, session->s_nr_caps, max_caps,
|
|
trim_caps - session->s_trim_caps);
|
|
session->s_trim_caps = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate cap_release messages. If there is a partially full message
|
|
* in the queue, try to allocate enough to cover it's remainder, so that
|
|
* we can send it immediately.
|
|
*
|
|
* Called under s_mutex.
|
|
*/
|
|
static int add_cap_releases(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
int extra)
|
|
{
|
|
struct ceph_msg *msg;
|
|
struct ceph_mds_cap_release *head;
|
|
int err = -ENOMEM;
|
|
|
|
if (extra < 0)
|
|
extra = mdsc->client->mount_args->cap_release_safety;
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
|
|
if (!list_empty(&session->s_cap_releases)) {
|
|
msg = list_first_entry(&session->s_cap_releases,
|
|
struct ceph_msg,
|
|
list_head);
|
|
head = msg->front.iov_base;
|
|
extra += CEPH_CAPS_PER_RELEASE - le32_to_cpu(head->num);
|
|
}
|
|
|
|
while (session->s_num_cap_releases < session->s_nr_caps + extra) {
|
|
spin_unlock(&session->s_cap_lock);
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
|
|
0, 0, NULL);
|
|
if (!msg)
|
|
goto out_unlocked;
|
|
dout("add_cap_releases %p msg %p now %d\n", session, msg,
|
|
(int)msg->front.iov_len);
|
|
head = msg->front.iov_base;
|
|
head->num = cpu_to_le32(0);
|
|
msg->front.iov_len = sizeof(*head);
|
|
spin_lock(&session->s_cap_lock);
|
|
list_add(&msg->list_head, &session->s_cap_releases);
|
|
session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
|
|
}
|
|
|
|
if (!list_empty(&session->s_cap_releases)) {
|
|
msg = list_first_entry(&session->s_cap_releases,
|
|
struct ceph_msg,
|
|
list_head);
|
|
head = msg->front.iov_base;
|
|
if (head->num) {
|
|
dout(" queueing non-full %p (%d)\n", msg,
|
|
le32_to_cpu(head->num));
|
|
list_move_tail(&msg->list_head,
|
|
&session->s_cap_releases_done);
|
|
session->s_num_cap_releases -=
|
|
CEPH_CAPS_PER_RELEASE - le32_to_cpu(head->num);
|
|
}
|
|
}
|
|
err = 0;
|
|
spin_unlock(&session->s_cap_lock);
|
|
out_unlocked:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* flush all dirty inode data to disk.
|
|
*
|
|
* returns true if we've flushed through want_flush_seq
|
|
*/
|
|
static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
|
|
{
|
|
int mds, ret = 1;
|
|
|
|
dout("check_cap_flush want %lld\n", want_flush_seq);
|
|
mutex_lock(&mdsc->mutex);
|
|
for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
|
|
struct ceph_mds_session *session = mdsc->sessions[mds];
|
|
|
|
if (!session)
|
|
continue;
|
|
get_session(session);
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
if (!list_empty(&session->s_cap_flushing)) {
|
|
struct ceph_inode_info *ci =
|
|
list_entry(session->s_cap_flushing.next,
|
|
struct ceph_inode_info,
|
|
i_flushing_item);
|
|
struct inode *inode = &ci->vfs_inode;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (ci->i_cap_flush_seq <= want_flush_seq) {
|
|
dout("check_cap_flush still flushing %p "
|
|
"seq %lld <= %lld to mds%d\n", inode,
|
|
ci->i_cap_flush_seq, want_flush_seq,
|
|
session->s_mds);
|
|
ret = 0;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
|
|
if (!ret)
|
|
return ret;
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* called under s_mutex
|
|
*/
|
|
static void send_cap_releases(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *msg;
|
|
|
|
dout("send_cap_releases mds%d\n", session->s_mds);
|
|
while (1) {
|
|
spin_lock(&session->s_cap_lock);
|
|
if (list_empty(&session->s_cap_releases_done))
|
|
break;
|
|
msg = list_first_entry(&session->s_cap_releases_done,
|
|
struct ceph_msg, list_head);
|
|
list_del_init(&msg->list_head);
|
|
spin_unlock(&session->s_cap_lock);
|
|
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
|
|
dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
|
|
ceph_con_send(&session->s_con, msg);
|
|
}
|
|
spin_unlock(&session->s_cap_lock);
|
|
}
|
|
|
|
/*
|
|
* requests
|
|
*/
|
|
|
|
/*
|
|
* Create an mds request.
|
|
*/
|
|
struct ceph_mds_request *
|
|
ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
|
|
{
|
|
struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
|
|
|
|
if (!req)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
req->r_started = jiffies;
|
|
req->r_resend_mds = -1;
|
|
INIT_LIST_HEAD(&req->r_unsafe_dir_item);
|
|
req->r_fmode = -1;
|
|
kref_init(&req->r_kref);
|
|
INIT_LIST_HEAD(&req->r_wait);
|
|
init_completion(&req->r_completion);
|
|
init_completion(&req->r_safe_completion);
|
|
INIT_LIST_HEAD(&req->r_unsafe_item);
|
|
|
|
req->r_op = op;
|
|
req->r_direct_mode = mode;
|
|
return req;
|
|
}
|
|
|
|
/*
|
|
* return oldest (lowest) request, tid in request tree, 0 if none.
|
|
*
|
|
* called under mdsc->mutex.
|
|
*/
|
|
static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
|
|
{
|
|
if (RB_EMPTY_ROOT(&mdsc->request_tree))
|
|
return NULL;
|
|
return rb_entry(rb_first(&mdsc->request_tree),
|
|
struct ceph_mds_request, r_node);
|
|
}
|
|
|
|
static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_mds_request *req = __get_oldest_req(mdsc);
|
|
|
|
if (req)
|
|
return req->r_tid;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Build a dentry's path. Allocate on heap; caller must kfree. Based
|
|
* on build_path_from_dentry in fs/cifs/dir.c.
|
|
*
|
|
* If @stop_on_nosnap, generate path relative to the first non-snapped
|
|
* inode.
|
|
*
|
|
* Encode hidden .snap dirs as a double /, i.e.
|
|
* foo/.snap/bar -> foo//bar
|
|
*/
|
|
char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
|
|
int stop_on_nosnap)
|
|
{
|
|
struct dentry *temp;
|
|
char *path;
|
|
int len, pos;
|
|
|
|
if (dentry == NULL)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
retry:
|
|
len = 0;
|
|
for (temp = dentry; !IS_ROOT(temp);) {
|
|
struct inode *inode = temp->d_inode;
|
|
if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
|
|
len++; /* slash only */
|
|
else if (stop_on_nosnap && inode &&
|
|
ceph_snap(inode) == CEPH_NOSNAP)
|
|
break;
|
|
else
|
|
len += 1 + temp->d_name.len;
|
|
temp = temp->d_parent;
|
|
if (temp == NULL) {
|
|
pr_err("build_path_dentry corrupt dentry %p\n", dentry);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
}
|
|
if (len)
|
|
len--; /* no leading '/' */
|
|
|
|
path = kmalloc(len+1, GFP_NOFS);
|
|
if (path == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
pos = len;
|
|
path[pos] = 0; /* trailing null */
|
|
for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
|
|
struct inode *inode = temp->d_inode;
|
|
|
|
if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
|
|
dout("build_path_dentry path+%d: %p SNAPDIR\n",
|
|
pos, temp);
|
|
} else if (stop_on_nosnap && inode &&
|
|
ceph_snap(inode) == CEPH_NOSNAP) {
|
|
break;
|
|
} else {
|
|
pos -= temp->d_name.len;
|
|
if (pos < 0)
|
|
break;
|
|
strncpy(path + pos, temp->d_name.name,
|
|
temp->d_name.len);
|
|
dout("build_path_dentry path+%d: %p '%.*s'\n",
|
|
pos, temp, temp->d_name.len, path + pos);
|
|
}
|
|
if (pos)
|
|
path[--pos] = '/';
|
|
temp = temp->d_parent;
|
|
if (temp == NULL) {
|
|
pr_err("build_path_dentry corrupt dentry\n");
|
|
kfree(path);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
}
|
|
if (pos != 0) {
|
|
pr_err("build_path_dentry did not end path lookup where "
|
|
"expected, namelen is %d, pos is %d\n", len, pos);
|
|
/* presumably this is only possible if racing with a
|
|
rename of one of the parent directories (we can not
|
|
lock the dentries above us to prevent this, but
|
|
retrying should be harmless) */
|
|
kfree(path);
|
|
goto retry;
|
|
}
|
|
|
|
*base = ceph_ino(temp->d_inode);
|
|
*plen = len;
|
|
dout("build_path_dentry on %p %d built %llx '%.*s'\n",
|
|
dentry, atomic_read(&dentry->d_count), *base, len, path);
|
|
return path;
|
|
}
|
|
|
|
static int build_dentry_path(struct dentry *dentry,
|
|
const char **ppath, int *ppathlen, u64 *pino,
|
|
int *pfreepath)
|
|
{
|
|
char *path;
|
|
|
|
if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
|
|
*pino = ceph_ino(dentry->d_parent->d_inode);
|
|
*ppath = dentry->d_name.name;
|
|
*ppathlen = dentry->d_name.len;
|
|
return 0;
|
|
}
|
|
path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
|
|
if (IS_ERR(path))
|
|
return PTR_ERR(path);
|
|
*ppath = path;
|
|
*pfreepath = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int build_inode_path(struct inode *inode,
|
|
const char **ppath, int *ppathlen, u64 *pino,
|
|
int *pfreepath)
|
|
{
|
|
struct dentry *dentry;
|
|
char *path;
|
|
|
|
if (ceph_snap(inode) == CEPH_NOSNAP) {
|
|
*pino = ceph_ino(inode);
|
|
*ppathlen = 0;
|
|
return 0;
|
|
}
|
|
dentry = d_find_alias(inode);
|
|
path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
|
|
dput(dentry);
|
|
if (IS_ERR(path))
|
|
return PTR_ERR(path);
|
|
*ppath = path;
|
|
*pfreepath = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* request arguments may be specified via an inode *, a dentry *, or
|
|
* an explicit ino+path.
|
|
*/
|
|
static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
|
|
const char *rpath, u64 rino,
|
|
const char **ppath, int *pathlen,
|
|
u64 *ino, int *freepath)
|
|
{
|
|
int r = 0;
|
|
|
|
if (rinode) {
|
|
r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
|
|
dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
|
|
ceph_snap(rinode));
|
|
} else if (rdentry) {
|
|
r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
|
|
dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
|
|
*ppath);
|
|
} else if (rpath) {
|
|
*ino = rino;
|
|
*ppath = rpath;
|
|
*pathlen = strlen(rpath);
|
|
dout(" path %.*s\n", *pathlen, rpath);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req,
|
|
int mds)
|
|
{
|
|
struct ceph_msg *msg;
|
|
struct ceph_mds_request_head *head;
|
|
const char *path1 = NULL;
|
|
const char *path2 = NULL;
|
|
u64 ino1 = 0, ino2 = 0;
|
|
int pathlen1 = 0, pathlen2 = 0;
|
|
int freepath1 = 0, freepath2 = 0;
|
|
int len;
|
|
u16 releases;
|
|
void *p, *end;
|
|
int ret;
|
|
|
|
ret = set_request_path_attr(req->r_inode, req->r_dentry,
|
|
req->r_path1, req->r_ino1.ino,
|
|
&path1, &pathlen1, &ino1, &freepath1);
|
|
if (ret < 0) {
|
|
msg = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = set_request_path_attr(NULL, req->r_old_dentry,
|
|
req->r_path2, req->r_ino2.ino,
|
|
&path2, &pathlen2, &ino2, &freepath2);
|
|
if (ret < 0) {
|
|
msg = ERR_PTR(ret);
|
|
goto out_free1;
|
|
}
|
|
|
|
len = sizeof(*head) +
|
|
pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
|
|
|
|
/* calculate (max) length for cap releases */
|
|
len += sizeof(struct ceph_mds_request_release) *
|
|
(!!req->r_inode_drop + !!req->r_dentry_drop +
|
|
!!req->r_old_inode_drop + !!req->r_old_dentry_drop);
|
|
if (req->r_dentry_drop)
|
|
len += req->r_dentry->d_name.len;
|
|
if (req->r_old_dentry_drop)
|
|
len += req->r_old_dentry->d_name.len;
|
|
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, 0, 0, NULL);
|
|
if (IS_ERR(msg))
|
|
goto out_free2;
|
|
|
|
msg->hdr.tid = cpu_to_le64(req->r_tid);
|
|
|
|
head = msg->front.iov_base;
|
|
p = msg->front.iov_base + sizeof(*head);
|
|
end = msg->front.iov_base + msg->front.iov_len;
|
|
|
|
head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
|
|
head->op = cpu_to_le32(req->r_op);
|
|
head->caller_uid = cpu_to_le32(current_fsuid());
|
|
head->caller_gid = cpu_to_le32(current_fsgid());
|
|
head->args = req->r_args;
|
|
|
|
ceph_encode_filepath(&p, end, ino1, path1);
|
|
ceph_encode_filepath(&p, end, ino2, path2);
|
|
|
|
/* cap releases */
|
|
releases = 0;
|
|
if (req->r_inode_drop)
|
|
releases += ceph_encode_inode_release(&p,
|
|
req->r_inode ? req->r_inode : req->r_dentry->d_inode,
|
|
mds, req->r_inode_drop, req->r_inode_unless, 0);
|
|
if (req->r_dentry_drop)
|
|
releases += ceph_encode_dentry_release(&p, req->r_dentry,
|
|
mds, req->r_dentry_drop, req->r_dentry_unless);
|
|
if (req->r_old_dentry_drop)
|
|
releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
|
|
mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
|
|
if (req->r_old_inode_drop)
|
|
releases += ceph_encode_inode_release(&p,
|
|
req->r_old_dentry->d_inode,
|
|
mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
|
|
head->num_releases = cpu_to_le16(releases);
|
|
|
|
BUG_ON(p > end);
|
|
msg->front.iov_len = p - msg->front.iov_base;
|
|
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
|
|
|
|
msg->pages = req->r_pages;
|
|
msg->nr_pages = req->r_num_pages;
|
|
msg->hdr.data_len = cpu_to_le32(req->r_data_len);
|
|
msg->hdr.data_off = cpu_to_le16(0);
|
|
|
|
out_free2:
|
|
if (freepath2)
|
|
kfree((char *)path2);
|
|
out_free1:
|
|
if (freepath1)
|
|
kfree((char *)path1);
|
|
out:
|
|
return msg;
|
|
}
|
|
|
|
/*
|
|
* called under mdsc->mutex if error, under no mutex if
|
|
* success.
|
|
*/
|
|
static void complete_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
if (req->r_callback)
|
|
req->r_callback(mdsc, req);
|
|
else
|
|
complete(&req->r_completion);
|
|
}
|
|
|
|
/*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static int __prepare_send_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req,
|
|
int mds)
|
|
{
|
|
struct ceph_mds_request_head *rhead;
|
|
struct ceph_msg *msg;
|
|
int flags = 0;
|
|
|
|
req->r_mds = mds;
|
|
req->r_attempts++;
|
|
dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
|
|
req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
|
|
|
|
if (req->r_request) {
|
|
ceph_msg_put(req->r_request);
|
|
req->r_request = NULL;
|
|
}
|
|
msg = create_request_message(mdsc, req, mds);
|
|
if (IS_ERR(msg)) {
|
|
req->r_reply = ERR_PTR(PTR_ERR(msg));
|
|
complete_request(mdsc, req);
|
|
return -PTR_ERR(msg);
|
|
}
|
|
req->r_request = msg;
|
|
|
|
rhead = msg->front.iov_base;
|
|
rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
|
|
if (req->r_got_unsafe)
|
|
flags |= CEPH_MDS_FLAG_REPLAY;
|
|
if (req->r_locked_dir)
|
|
flags |= CEPH_MDS_FLAG_WANT_DENTRY;
|
|
rhead->flags = cpu_to_le32(flags);
|
|
rhead->num_fwd = req->r_num_fwd;
|
|
rhead->num_retry = req->r_attempts - 1;
|
|
|
|
dout(" r_locked_dir = %p\n", req->r_locked_dir);
|
|
|
|
if (req->r_target_inode && req->r_got_unsafe)
|
|
rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
|
|
else
|
|
rhead->ino = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* send request, or put it on the appropriate wait list.
|
|
*/
|
|
static int __do_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
struct ceph_mds_session *session = NULL;
|
|
int mds = -1;
|
|
int err = -EAGAIN;
|
|
|
|
if (req->r_reply)
|
|
goto out;
|
|
|
|
if (req->r_timeout &&
|
|
time_after_eq(jiffies, req->r_started + req->r_timeout)) {
|
|
dout("do_request timed out\n");
|
|
err = -EIO;
|
|
goto finish;
|
|
}
|
|
|
|
mds = __choose_mds(mdsc, req);
|
|
if (mds < 0 ||
|
|
ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
|
|
dout("do_request no mds or not active, waiting for map\n");
|
|
list_add(&req->r_wait, &mdsc->waiting_for_map);
|
|
goto out;
|
|
}
|
|
|
|
/* get, open session */
|
|
session = __ceph_lookup_mds_session(mdsc, mds);
|
|
if (!session) {
|
|
session = register_session(mdsc, mds);
|
|
if (IS_ERR(session)) {
|
|
err = PTR_ERR(session);
|
|
goto finish;
|
|
}
|
|
}
|
|
dout("do_request mds%d session %p state %s\n", mds, session,
|
|
session_state_name(session->s_state));
|
|
if (session->s_state != CEPH_MDS_SESSION_OPEN &&
|
|
session->s_state != CEPH_MDS_SESSION_HUNG) {
|
|
if (session->s_state == CEPH_MDS_SESSION_NEW ||
|
|
session->s_state == CEPH_MDS_SESSION_CLOSING)
|
|
__open_session(mdsc, session);
|
|
list_add(&req->r_wait, &session->s_waiting);
|
|
goto out_session;
|
|
}
|
|
|
|
/* send request */
|
|
req->r_session = get_session(session);
|
|
req->r_resend_mds = -1; /* forget any previous mds hint */
|
|
|
|
if (req->r_request_started == 0) /* note request start time */
|
|
req->r_request_started = jiffies;
|
|
|
|
err = __prepare_send_request(mdsc, req, mds);
|
|
if (!err) {
|
|
ceph_msg_get(req->r_request);
|
|
ceph_con_send(&session->s_con, req->r_request);
|
|
}
|
|
|
|
out_session:
|
|
ceph_put_mds_session(session);
|
|
out:
|
|
return err;
|
|
|
|
finish:
|
|
req->r_reply = ERR_PTR(err);
|
|
complete_request(mdsc, req);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static void __wake_requests(struct ceph_mds_client *mdsc,
|
|
struct list_head *head)
|
|
{
|
|
struct ceph_mds_request *req, *nreq;
|
|
|
|
list_for_each_entry_safe(req, nreq, head, r_wait) {
|
|
list_del_init(&req->r_wait);
|
|
__do_request(mdsc, req);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wake up threads with requests pending for @mds, so that they can
|
|
* resubmit their requests to a possibly different mds. If @all is set,
|
|
* wake up if their requests has been forwarded to @mds, too.
|
|
*/
|
|
static void kick_requests(struct ceph_mds_client *mdsc, int mds, int all)
|
|
{
|
|
struct ceph_mds_request *req;
|
|
struct rb_node *p;
|
|
|
|
dout("kick_requests mds%d\n", mds);
|
|
for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
|
|
req = rb_entry(p, struct ceph_mds_request, r_node);
|
|
if (req->r_got_unsafe)
|
|
continue;
|
|
if (req->r_session &&
|
|
req->r_session->s_mds == mds) {
|
|
dout(" kicking tid %llu\n", req->r_tid);
|
|
put_request_session(req);
|
|
__do_request(mdsc, req);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
dout("submit_request on %p\n", req);
|
|
mutex_lock(&mdsc->mutex);
|
|
__register_request(mdsc, req, NULL);
|
|
__do_request(mdsc, req);
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
/*
|
|
* Synchrously perform an mds request. Take care of all of the
|
|
* session setup, forwarding, retry details.
|
|
*/
|
|
int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
|
|
struct inode *dir,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
int err;
|
|
|
|
dout("do_request on %p\n", req);
|
|
|
|
/* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
|
|
if (req->r_inode)
|
|
ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
|
|
if (req->r_locked_dir)
|
|
ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
|
|
if (req->r_old_dentry)
|
|
ceph_get_cap_refs(
|
|
ceph_inode(req->r_old_dentry->d_parent->d_inode),
|
|
CEPH_CAP_PIN);
|
|
|
|
/* issue */
|
|
mutex_lock(&mdsc->mutex);
|
|
__register_request(mdsc, req, dir);
|
|
__do_request(mdsc, req);
|
|
|
|
/* wait */
|
|
if (!req->r_reply) {
|
|
mutex_unlock(&mdsc->mutex);
|
|
if (req->r_timeout) {
|
|
err = (long)wait_for_completion_interruptible_timeout(
|
|
&req->r_completion, req->r_timeout);
|
|
if (err == 0)
|
|
req->r_reply = ERR_PTR(-EIO);
|
|
else if (err < 0)
|
|
req->r_reply = ERR_PTR(err);
|
|
} else {
|
|
err = wait_for_completion_interruptible(
|
|
&req->r_completion);
|
|
if (err)
|
|
req->r_reply = ERR_PTR(err);
|
|
}
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
|
|
if (IS_ERR(req->r_reply)) {
|
|
err = PTR_ERR(req->r_reply);
|
|
req->r_reply = NULL;
|
|
|
|
if (err == -ERESTARTSYS) {
|
|
/* aborted */
|
|
req->r_aborted = true;
|
|
|
|
if (req->r_locked_dir &&
|
|
(req->r_op & CEPH_MDS_OP_WRITE)) {
|
|
struct ceph_inode_info *ci =
|
|
ceph_inode(req->r_locked_dir);
|
|
|
|
dout("aborted, clearing I_COMPLETE on %p\n",
|
|
req->r_locked_dir);
|
|
spin_lock(&req->r_locked_dir->i_lock);
|
|
ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
|
|
ci->i_release_count++;
|
|
spin_unlock(&req->r_locked_dir->i_lock);
|
|
}
|
|
} else {
|
|
/* clean up this request */
|
|
__unregister_request(mdsc, req);
|
|
if (!list_empty(&req->r_unsafe_item))
|
|
list_del_init(&req->r_unsafe_item);
|
|
complete(&req->r_safe_completion);
|
|
}
|
|
} else if (req->r_err) {
|
|
err = req->r_err;
|
|
} else {
|
|
err = le32_to_cpu(req->r_reply_info.head->result);
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
dout("do_request %p done, result %d\n", req, err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Handle mds reply.
|
|
*
|
|
* We take the session mutex and parse and process the reply immediately.
|
|
* This preserves the logical ordering of replies, capabilities, etc., sent
|
|
* by the MDS as they are applied to our local cache.
|
|
*/
|
|
static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_client *mdsc = session->s_mdsc;
|
|
struct ceph_mds_request *req;
|
|
struct ceph_mds_reply_head *head = msg->front.iov_base;
|
|
struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
|
|
u64 tid;
|
|
int err, result;
|
|
int mds = session->s_mds;
|
|
|
|
if (msg->front.iov_len < sizeof(*head)) {
|
|
pr_err("mdsc_handle_reply got corrupt (short) reply\n");
|
|
ceph_msg_dump(msg);
|
|
return;
|
|
}
|
|
|
|
/* get request, session */
|
|
tid = le64_to_cpu(msg->hdr.tid);
|
|
mutex_lock(&mdsc->mutex);
|
|
req = __lookup_request(mdsc, tid);
|
|
if (!req) {
|
|
dout("handle_reply on unknown tid %llu\n", tid);
|
|
mutex_unlock(&mdsc->mutex);
|
|
return;
|
|
}
|
|
dout("handle_reply %p\n", req);
|
|
|
|
/* correct session? */
|
|
if (req->r_session != session) {
|
|
pr_err("mdsc_handle_reply got %llu on session mds%d"
|
|
" not mds%d\n", tid, session->s_mds,
|
|
req->r_session ? req->r_session->s_mds : -1);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
|
|
/* dup? */
|
|
if ((req->r_got_unsafe && !head->safe) ||
|
|
(req->r_got_safe && head->safe)) {
|
|
pr_warning("got a dup %s reply on %llu from mds%d\n",
|
|
head->safe ? "safe" : "unsafe", tid, mds);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
|
|
result = le32_to_cpu(head->result);
|
|
|
|
/*
|
|
* Tolerate 2 consecutive ESTALEs from the same mds.
|
|
* FIXME: we should be looking at the cap migrate_seq.
|
|
*/
|
|
if (result == -ESTALE) {
|
|
req->r_direct_mode = USE_AUTH_MDS;
|
|
req->r_num_stale++;
|
|
if (req->r_num_stale <= 2) {
|
|
__do_request(mdsc, req);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
} else {
|
|
req->r_num_stale = 0;
|
|
}
|
|
|
|
if (head->safe) {
|
|
req->r_got_safe = true;
|
|
__unregister_request(mdsc, req);
|
|
complete(&req->r_safe_completion);
|
|
|
|
if (req->r_got_unsafe) {
|
|
/*
|
|
* We already handled the unsafe response, now do the
|
|
* cleanup. No need to examine the response; the MDS
|
|
* doesn't include any result info in the safe
|
|
* response. And even if it did, there is nothing
|
|
* useful we could do with a revised return value.
|
|
*/
|
|
dout("got safe reply %llu, mds%d\n", tid, mds);
|
|
list_del_init(&req->r_unsafe_item);
|
|
|
|
/* last unsafe request during umount? */
|
|
if (mdsc->stopping && !__get_oldest_req(mdsc))
|
|
complete(&mdsc->safe_umount_waiters);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
BUG_ON(req->r_reply);
|
|
|
|
if (!head->safe) {
|
|
req->r_got_unsafe = true;
|
|
list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
|
|
}
|
|
|
|
dout("handle_reply tid %lld result %d\n", tid, result);
|
|
rinfo = &req->r_reply_info;
|
|
err = parse_reply_info(msg, rinfo);
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
if (err < 0) {
|
|
pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds);
|
|
ceph_msg_dump(msg);
|
|
goto out_err;
|
|
}
|
|
|
|
/* snap trace */
|
|
if (rinfo->snapblob_len) {
|
|
down_write(&mdsc->snap_rwsem);
|
|
ceph_update_snap_trace(mdsc, rinfo->snapblob,
|
|
rinfo->snapblob + rinfo->snapblob_len,
|
|
le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
|
|
downgrade_write(&mdsc->snap_rwsem);
|
|
} else {
|
|
down_read(&mdsc->snap_rwsem);
|
|
}
|
|
|
|
/* insert trace into our cache */
|
|
err = ceph_fill_trace(mdsc->client->sb, req, req->r_session);
|
|
if (err == 0) {
|
|
if (result == 0 && rinfo->dir_nr)
|
|
ceph_readdir_prepopulate(req, req->r_session);
|
|
ceph_unreserve_caps(&req->r_caps_reservation);
|
|
}
|
|
|
|
up_read(&mdsc->snap_rwsem);
|
|
out_err:
|
|
if (err) {
|
|
req->r_err = err;
|
|
} else {
|
|
req->r_reply = msg;
|
|
ceph_msg_get(msg);
|
|
}
|
|
|
|
add_cap_releases(mdsc, req->r_session, -1);
|
|
mutex_unlock(&session->s_mutex);
|
|
|
|
/* kick calling process */
|
|
complete_request(mdsc, req);
|
|
out:
|
|
ceph_mdsc_put_request(req);
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* handle mds notification that our request has been forwarded.
|
|
*/
|
|
static void handle_forward(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_request *req;
|
|
u64 tid = le64_to_cpu(msg->hdr.tid);
|
|
u32 next_mds;
|
|
u32 fwd_seq;
|
|
int err = -EINVAL;
|
|
void *p = msg->front.iov_base;
|
|
void *end = p + msg->front.iov_len;
|
|
|
|
ceph_decode_need(&p, end, 2*sizeof(u32), bad);
|
|
next_mds = ceph_decode_32(&p);
|
|
fwd_seq = ceph_decode_32(&p);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
req = __lookup_request(mdsc, tid);
|
|
if (!req) {
|
|
dout("forward %llu to mds%d - req dne\n", tid, next_mds);
|
|
goto out; /* dup reply? */
|
|
}
|
|
|
|
if (fwd_seq <= req->r_num_fwd) {
|
|
dout("forward %llu to mds%d - old seq %d <= %d\n",
|
|
tid, next_mds, req->r_num_fwd, fwd_seq);
|
|
} else {
|
|
/* resend. forward race not possible; mds would drop */
|
|
dout("forward %llu to mds%d (we resend)\n", tid, next_mds);
|
|
req->r_num_fwd = fwd_seq;
|
|
req->r_resend_mds = next_mds;
|
|
put_request_session(req);
|
|
__do_request(mdsc, req);
|
|
}
|
|
ceph_mdsc_put_request(req);
|
|
out:
|
|
mutex_unlock(&mdsc->mutex);
|
|
return;
|
|
|
|
bad:
|
|
pr_err("mdsc_handle_forward decode error err=%d\n", err);
|
|
}
|
|
|
|
/*
|
|
* handle a mds session control message
|
|
*/
|
|
static void handle_session(struct ceph_mds_session *session,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_client *mdsc = session->s_mdsc;
|
|
u32 op;
|
|
u64 seq;
|
|
int mds = session->s_mds;
|
|
struct ceph_mds_session_head *h = msg->front.iov_base;
|
|
int wake = 0;
|
|
|
|
/* decode */
|
|
if (msg->front.iov_len != sizeof(*h))
|
|
goto bad;
|
|
op = le32_to_cpu(h->op);
|
|
seq = le64_to_cpu(h->seq);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
if (op == CEPH_SESSION_CLOSE)
|
|
__unregister_session(mdsc, session);
|
|
/* FIXME: this ttl calculation is generous */
|
|
session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
|
|
dout("handle_session mds%d %s %p state %s seq %llu\n",
|
|
mds, ceph_session_op_name(op), session,
|
|
session_state_name(session->s_state), seq);
|
|
|
|
if (session->s_state == CEPH_MDS_SESSION_HUNG) {
|
|
session->s_state = CEPH_MDS_SESSION_OPEN;
|
|
pr_info("mds%d came back\n", session->s_mds);
|
|
}
|
|
|
|
switch (op) {
|
|
case CEPH_SESSION_OPEN:
|
|
session->s_state = CEPH_MDS_SESSION_OPEN;
|
|
renewed_caps(mdsc, session, 0);
|
|
wake = 1;
|
|
if (mdsc->stopping)
|
|
__close_session(mdsc, session);
|
|
break;
|
|
|
|
case CEPH_SESSION_RENEWCAPS:
|
|
if (session->s_renew_seq == seq)
|
|
renewed_caps(mdsc, session, 1);
|
|
break;
|
|
|
|
case CEPH_SESSION_CLOSE:
|
|
remove_session_caps(session);
|
|
wake = 1; /* for good measure */
|
|
complete(&mdsc->session_close_waiters);
|
|
kick_requests(mdsc, mds, 0); /* cur only */
|
|
break;
|
|
|
|
case CEPH_SESSION_STALE:
|
|
pr_info("mds%d caps went stale, renewing\n",
|
|
session->s_mds);
|
|
spin_lock(&session->s_cap_lock);
|
|
session->s_cap_gen++;
|
|
session->s_cap_ttl = 0;
|
|
spin_unlock(&session->s_cap_lock);
|
|
send_renew_caps(mdsc, session);
|
|
break;
|
|
|
|
case CEPH_SESSION_RECALL_STATE:
|
|
trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
|
|
break;
|
|
|
|
default:
|
|
pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
|
|
WARN_ON(1);
|
|
}
|
|
|
|
mutex_unlock(&session->s_mutex);
|
|
if (wake) {
|
|
mutex_lock(&mdsc->mutex);
|
|
__wake_requests(mdsc, &session->s_waiting);
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
return;
|
|
|
|
bad:
|
|
pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
|
|
(int)msg->front.iov_len);
|
|
ceph_msg_dump(msg);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* called under session->mutex.
|
|
*/
|
|
static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_mds_request *req, *nreq;
|
|
int err;
|
|
|
|
dout("replay_unsafe_requests mds%d\n", session->s_mds);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
|
|
err = __prepare_send_request(mdsc, req, session->s_mds);
|
|
if (!err) {
|
|
ceph_msg_get(req->r_request);
|
|
ceph_con_send(&session->s_con, req->r_request);
|
|
}
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
/*
|
|
* Encode information about a cap for a reconnect with the MDS.
|
|
*/
|
|
static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
|
|
void *arg)
|
|
{
|
|
struct ceph_mds_cap_reconnect rec;
|
|
struct ceph_inode_info *ci;
|
|
struct ceph_pagelist *pagelist = arg;
|
|
char *path;
|
|
int pathlen, err;
|
|
u64 pathbase;
|
|
struct dentry *dentry;
|
|
|
|
ci = cap->ci;
|
|
|
|
dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
|
|
inode, ceph_vinop(inode), cap, cap->cap_id,
|
|
ceph_cap_string(cap->issued));
|
|
err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
|
|
if (err)
|
|
return err;
|
|
|
|
dentry = d_find_alias(inode);
|
|
if (dentry) {
|
|
path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
|
|
if (IS_ERR(path)) {
|
|
err = PTR_ERR(path);
|
|
BUG_ON(err);
|
|
}
|
|
} else {
|
|
path = NULL;
|
|
pathlen = 0;
|
|
}
|
|
err = ceph_pagelist_encode_string(pagelist, path, pathlen);
|
|
if (err)
|
|
goto out;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
cap->seq = 0; /* reset cap seq */
|
|
cap->issue_seq = 0; /* and issue_seq */
|
|
rec.cap_id = cpu_to_le64(cap->cap_id);
|
|
rec.pathbase = cpu_to_le64(pathbase);
|
|
rec.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
|
|
rec.issued = cpu_to_le32(cap->issued);
|
|
rec.size = cpu_to_le64(inode->i_size);
|
|
ceph_encode_timespec(&rec.mtime, &inode->i_mtime);
|
|
ceph_encode_timespec(&rec.atime, &inode->i_atime);
|
|
rec.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
err = ceph_pagelist_append(pagelist, &rec, sizeof(rec));
|
|
|
|
out:
|
|
kfree(path);
|
|
dput(dentry);
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* If an MDS fails and recovers, clients need to reconnect in order to
|
|
* reestablish shared state. This includes all caps issued through
|
|
* this session _and_ the snap_realm hierarchy. Because it's not
|
|
* clear which snap realms the mds cares about, we send everything we
|
|
* know about.. that ensures we'll then get any new info the
|
|
* recovering MDS might have.
|
|
*
|
|
* This is a relatively heavyweight operation, but it's rare.
|
|
*
|
|
* called with mdsc->mutex held.
|
|
*/
|
|
static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds)
|
|
{
|
|
struct ceph_mds_session *session = NULL;
|
|
struct ceph_msg *reply;
|
|
struct rb_node *p;
|
|
int err = -ENOMEM;
|
|
struct ceph_pagelist *pagelist;
|
|
|
|
pr_info("reconnect to recovering mds%d\n", mds);
|
|
|
|
pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
|
|
if (!pagelist)
|
|
goto fail_nopagelist;
|
|
ceph_pagelist_init(pagelist);
|
|
|
|
reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, 0, 0, NULL);
|
|
if (IS_ERR(reply)) {
|
|
err = PTR_ERR(reply);
|
|
goto fail_nomsg;
|
|
}
|
|
|
|
/* find session */
|
|
session = __ceph_lookup_mds_session(mdsc, mds);
|
|
mutex_unlock(&mdsc->mutex); /* drop lock for duration */
|
|
|
|
if (session) {
|
|
mutex_lock(&session->s_mutex);
|
|
|
|
session->s_state = CEPH_MDS_SESSION_RECONNECTING;
|
|
session->s_seq = 0;
|
|
|
|
ceph_con_open(&session->s_con,
|
|
ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
|
|
|
|
/* replay unsafe requests */
|
|
replay_unsafe_requests(mdsc, session);
|
|
} else {
|
|
dout("no session for mds%d, will send short reconnect\n",
|
|
mds);
|
|
}
|
|
|
|
down_read(&mdsc->snap_rwsem);
|
|
|
|
if (!session)
|
|
goto send;
|
|
dout("session %p state %s\n", session,
|
|
session_state_name(session->s_state));
|
|
|
|
/* traverse this session's caps */
|
|
err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
|
|
if (err)
|
|
goto fail;
|
|
err = iterate_session_caps(session, encode_caps_cb, pagelist);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
/*
|
|
* snaprealms. we provide mds with the ino, seq (version), and
|
|
* parent for all of our realms. If the mds has any newer info,
|
|
* it will tell us.
|
|
*/
|
|
for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
|
|
struct ceph_snap_realm *realm =
|
|
rb_entry(p, struct ceph_snap_realm, node);
|
|
struct ceph_mds_snaprealm_reconnect sr_rec;
|
|
|
|
dout(" adding snap realm %llx seq %lld parent %llx\n",
|
|
realm->ino, realm->seq, realm->parent_ino);
|
|
sr_rec.ino = cpu_to_le64(realm->ino);
|
|
sr_rec.seq = cpu_to_le64(realm->seq);
|
|
sr_rec.parent = cpu_to_le64(realm->parent_ino);
|
|
err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
|
|
if (err)
|
|
goto fail;
|
|
}
|
|
|
|
send:
|
|
reply->pagelist = pagelist;
|
|
reply->hdr.data_len = cpu_to_le32(pagelist->length);
|
|
reply->nr_pages = calc_pages_for(0, pagelist->length);
|
|
ceph_con_send(&session->s_con, reply);
|
|
|
|
session->s_state = CEPH_MDS_SESSION_OPEN;
|
|
mutex_unlock(&session->s_mutex);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
__wake_requests(mdsc, &session->s_waiting);
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
ceph_put_mds_session(session);
|
|
|
|
up_read(&mdsc->snap_rwsem);
|
|
mutex_lock(&mdsc->mutex);
|
|
return;
|
|
|
|
fail:
|
|
ceph_msg_put(reply);
|
|
up_read(&mdsc->snap_rwsem);
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
fail_nomsg:
|
|
ceph_pagelist_release(pagelist);
|
|
kfree(pagelist);
|
|
fail_nopagelist:
|
|
pr_err("error %d preparing reconnect for mds%d\n", err, mds);
|
|
mutex_lock(&mdsc->mutex);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* compare old and new mdsmaps, kicking requests
|
|
* and closing out old connections as necessary
|
|
*
|
|
* called under mdsc->mutex.
|
|
*/
|
|
static void check_new_map(struct ceph_mds_client *mdsc,
|
|
struct ceph_mdsmap *newmap,
|
|
struct ceph_mdsmap *oldmap)
|
|
{
|
|
int i;
|
|
int oldstate, newstate;
|
|
struct ceph_mds_session *s;
|
|
|
|
dout("check_new_map new %u old %u\n",
|
|
newmap->m_epoch, oldmap->m_epoch);
|
|
|
|
for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
|
|
if (mdsc->sessions[i] == NULL)
|
|
continue;
|
|
s = mdsc->sessions[i];
|
|
oldstate = ceph_mdsmap_get_state(oldmap, i);
|
|
newstate = ceph_mdsmap_get_state(newmap, i);
|
|
|
|
dout("check_new_map mds%d state %s -> %s (session %s)\n",
|
|
i, ceph_mds_state_name(oldstate),
|
|
ceph_mds_state_name(newstate),
|
|
session_state_name(s->s_state));
|
|
|
|
if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
|
|
ceph_mdsmap_get_addr(newmap, i),
|
|
sizeof(struct ceph_entity_addr))) {
|
|
if (s->s_state == CEPH_MDS_SESSION_OPENING) {
|
|
/* the session never opened, just close it
|
|
* out now */
|
|
__wake_requests(mdsc, &s->s_waiting);
|
|
__unregister_session(mdsc, s);
|
|
} else {
|
|
/* just close it */
|
|
mutex_unlock(&mdsc->mutex);
|
|
mutex_lock(&s->s_mutex);
|
|
mutex_lock(&mdsc->mutex);
|
|
ceph_con_close(&s->s_con);
|
|
mutex_unlock(&s->s_mutex);
|
|
s->s_state = CEPH_MDS_SESSION_RESTARTING;
|
|
}
|
|
|
|
/* kick any requests waiting on the recovering mds */
|
|
kick_requests(mdsc, i, 1);
|
|
} else if (oldstate == newstate) {
|
|
continue; /* nothing new with this mds */
|
|
}
|
|
|
|
/*
|
|
* send reconnect?
|
|
*/
|
|
if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
|
|
newstate >= CEPH_MDS_STATE_RECONNECT)
|
|
send_mds_reconnect(mdsc, i);
|
|
|
|
/*
|
|
* kick requests on any mds that has gone active.
|
|
*
|
|
* kick requests on cur or forwarder: we may have sent
|
|
* the request to mds1, mds1 told us it forwarded it
|
|
* to mds2, but then we learn mds1 failed and can't be
|
|
* sure it successfully forwarded our request before
|
|
* it died.
|
|
*/
|
|
if (oldstate < CEPH_MDS_STATE_ACTIVE &&
|
|
newstate >= CEPH_MDS_STATE_ACTIVE) {
|
|
pr_info("mds%d reconnect completed\n", s->s_mds);
|
|
kick_requests(mdsc, i, 1);
|
|
ceph_kick_flushing_caps(mdsc, s);
|
|
wake_up_session_caps(s, 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* leases
|
|
*/
|
|
|
|
/*
|
|
* caller must hold session s_mutex, dentry->d_lock
|
|
*/
|
|
void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
|
|
ceph_put_mds_session(di->lease_session);
|
|
di->lease_session = NULL;
|
|
}
|
|
|
|
static void handle_lease(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct super_block *sb = mdsc->client->sb;
|
|
struct inode *inode;
|
|
struct ceph_inode_info *ci;
|
|
struct dentry *parent, *dentry;
|
|
struct ceph_dentry_info *di;
|
|
int mds = session->s_mds;
|
|
struct ceph_mds_lease *h = msg->front.iov_base;
|
|
struct ceph_vino vino;
|
|
int mask;
|
|
struct qstr dname;
|
|
int release = 0;
|
|
|
|
dout("handle_lease from mds%d\n", mds);
|
|
|
|
/* decode */
|
|
if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
|
|
goto bad;
|
|
vino.ino = le64_to_cpu(h->ino);
|
|
vino.snap = CEPH_NOSNAP;
|
|
mask = le16_to_cpu(h->mask);
|
|
dname.name = (void *)h + sizeof(*h) + sizeof(u32);
|
|
dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
|
|
if (dname.len != get_unaligned_le32(h+1))
|
|
goto bad;
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
session->s_seq++;
|
|
|
|
/* lookup inode */
|
|
inode = ceph_find_inode(sb, vino);
|
|
dout("handle_lease '%s', mask %d, ino %llx %p\n",
|
|
ceph_lease_op_name(h->action), mask, vino.ino, inode);
|
|
if (inode == NULL) {
|
|
dout("handle_lease no inode %llx\n", vino.ino);
|
|
goto release;
|
|
}
|
|
ci = ceph_inode(inode);
|
|
|
|
/* dentry */
|
|
parent = d_find_alias(inode);
|
|
if (!parent) {
|
|
dout("no parent dentry on inode %p\n", inode);
|
|
WARN_ON(1);
|
|
goto release; /* hrm... */
|
|
}
|
|
dname.hash = full_name_hash(dname.name, dname.len);
|
|
dentry = d_lookup(parent, &dname);
|
|
dput(parent);
|
|
if (!dentry)
|
|
goto release;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
di = ceph_dentry(dentry);
|
|
switch (h->action) {
|
|
case CEPH_MDS_LEASE_REVOKE:
|
|
if (di && di->lease_session == session) {
|
|
h->seq = cpu_to_le32(di->lease_seq);
|
|
__ceph_mdsc_drop_dentry_lease(dentry);
|
|
}
|
|
release = 1;
|
|
break;
|
|
|
|
case CEPH_MDS_LEASE_RENEW:
|
|
if (di && di->lease_session == session &&
|
|
di->lease_gen == session->s_cap_gen &&
|
|
di->lease_renew_from &&
|
|
di->lease_renew_after == 0) {
|
|
unsigned long duration =
|
|
le32_to_cpu(h->duration_ms) * HZ / 1000;
|
|
|
|
di->lease_seq = le32_to_cpu(h->seq);
|
|
dentry->d_time = di->lease_renew_from + duration;
|
|
di->lease_renew_after = di->lease_renew_from +
|
|
(duration >> 1);
|
|
di->lease_renew_from = 0;
|
|
}
|
|
break;
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
dput(dentry);
|
|
|
|
if (!release)
|
|
goto out;
|
|
|
|
release:
|
|
/* let's just reuse the same message */
|
|
h->action = CEPH_MDS_LEASE_REVOKE_ACK;
|
|
ceph_msg_get(msg);
|
|
ceph_con_send(&session->s_con, msg);
|
|
|
|
out:
|
|
iput(inode);
|
|
mutex_unlock(&session->s_mutex);
|
|
return;
|
|
|
|
bad:
|
|
pr_err("corrupt lease message\n");
|
|
ceph_msg_dump(msg);
|
|
}
|
|
|
|
void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
|
|
struct inode *inode,
|
|
struct dentry *dentry, char action,
|
|
u32 seq)
|
|
{
|
|
struct ceph_msg *msg;
|
|
struct ceph_mds_lease *lease;
|
|
int len = sizeof(*lease) + sizeof(u32);
|
|
int dnamelen = 0;
|
|
|
|
dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
|
|
inode, dentry, ceph_lease_op_name(action), session->s_mds);
|
|
dnamelen = dentry->d_name.len;
|
|
len += dnamelen;
|
|
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, 0, 0, NULL);
|
|
if (IS_ERR(msg))
|
|
return;
|
|
lease = msg->front.iov_base;
|
|
lease->action = action;
|
|
lease->mask = cpu_to_le16(CEPH_LOCK_DN);
|
|
lease->ino = cpu_to_le64(ceph_vino(inode).ino);
|
|
lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
|
|
lease->seq = cpu_to_le32(seq);
|
|
put_unaligned_le32(dnamelen, lease + 1);
|
|
memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
|
|
|
|
/*
|
|
* if this is a preemptive lease RELEASE, no need to
|
|
* flush request stream, since the actual request will
|
|
* soon follow.
|
|
*/
|
|
msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
|
|
|
|
ceph_con_send(&session->s_con, msg);
|
|
}
|
|
|
|
/*
|
|
* Preemptively release a lease we expect to invalidate anyway.
|
|
* Pass @inode always, @dentry is optional.
|
|
*/
|
|
void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
|
|
struct dentry *dentry, int mask)
|
|
{
|
|
struct ceph_dentry_info *di;
|
|
struct ceph_mds_session *session;
|
|
u32 seq;
|
|
|
|
BUG_ON(inode == NULL);
|
|
BUG_ON(dentry == NULL);
|
|
BUG_ON(mask != CEPH_LOCK_DN);
|
|
|
|
/* is dentry lease valid? */
|
|
spin_lock(&dentry->d_lock);
|
|
di = ceph_dentry(dentry);
|
|
if (!di || !di->lease_session ||
|
|
di->lease_session->s_mds < 0 ||
|
|
di->lease_gen != di->lease_session->s_cap_gen ||
|
|
!time_before(jiffies, dentry->d_time)) {
|
|
dout("lease_release inode %p dentry %p -- "
|
|
"no lease on %d\n",
|
|
inode, dentry, mask);
|
|
spin_unlock(&dentry->d_lock);
|
|
return;
|
|
}
|
|
|
|
/* we do have a lease on this dentry; note mds and seq */
|
|
session = ceph_get_mds_session(di->lease_session);
|
|
seq = di->lease_seq;
|
|
__ceph_mdsc_drop_dentry_lease(dentry);
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
dout("lease_release inode %p dentry %p mask %d to mds%d\n",
|
|
inode, dentry, mask, session->s_mds);
|
|
ceph_mdsc_lease_send_msg(session, inode, dentry,
|
|
CEPH_MDS_LEASE_RELEASE, seq);
|
|
ceph_put_mds_session(session);
|
|
}
|
|
|
|
/*
|
|
* drop all leases (and dentry refs) in preparation for umount
|
|
*/
|
|
static void drop_leases(struct ceph_mds_client *mdsc)
|
|
{
|
|
int i;
|
|
|
|
dout("drop_leases\n");
|
|
mutex_lock(&mdsc->mutex);
|
|
for (i = 0; i < mdsc->max_sessions; i++) {
|
|
struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
|
|
if (!s)
|
|
continue;
|
|
mutex_unlock(&mdsc->mutex);
|
|
mutex_lock(&s->s_mutex);
|
|
mutex_unlock(&s->s_mutex);
|
|
ceph_put_mds_session(s);
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* delayed work -- periodically trim expired leases, renew caps with mds
|
|
*/
|
|
static void schedule_delayed(struct ceph_mds_client *mdsc)
|
|
{
|
|
int delay = 5;
|
|
unsigned hz = round_jiffies_relative(HZ * delay);
|
|
schedule_delayed_work(&mdsc->delayed_work, hz);
|
|
}
|
|
|
|
static void delayed_work(struct work_struct *work)
|
|
{
|
|
int i;
|
|
struct ceph_mds_client *mdsc =
|
|
container_of(work, struct ceph_mds_client, delayed_work.work);
|
|
int renew_interval;
|
|
int renew_caps;
|
|
|
|
dout("mdsc delayed_work\n");
|
|
ceph_check_delayed_caps(mdsc);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
|
|
renew_caps = time_after_eq(jiffies, HZ*renew_interval +
|
|
mdsc->last_renew_caps);
|
|
if (renew_caps)
|
|
mdsc->last_renew_caps = jiffies;
|
|
|
|
for (i = 0; i < mdsc->max_sessions; i++) {
|
|
struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
|
|
if (s == NULL)
|
|
continue;
|
|
if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
|
|
dout("resending session close request for mds%d\n",
|
|
s->s_mds);
|
|
request_close_session(mdsc, s);
|
|
ceph_put_mds_session(s);
|
|
continue;
|
|
}
|
|
if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
|
|
if (s->s_state == CEPH_MDS_SESSION_OPEN) {
|
|
s->s_state = CEPH_MDS_SESSION_HUNG;
|
|
pr_info("mds%d hung\n", s->s_mds);
|
|
}
|
|
}
|
|
if (s->s_state < CEPH_MDS_SESSION_OPEN) {
|
|
/* this mds is failed or recovering, just wait */
|
|
ceph_put_mds_session(s);
|
|
continue;
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
mutex_lock(&s->s_mutex);
|
|
if (renew_caps)
|
|
send_renew_caps(mdsc, s);
|
|
else
|
|
ceph_con_keepalive(&s->s_con);
|
|
add_cap_releases(mdsc, s, -1);
|
|
send_cap_releases(mdsc, s);
|
|
mutex_unlock(&s->s_mutex);
|
|
ceph_put_mds_session(s);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
schedule_delayed(mdsc);
|
|
}
|
|
|
|
|
|
int ceph_mdsc_init(struct ceph_mds_client *mdsc, struct ceph_client *client)
|
|
{
|
|
mdsc->client = client;
|
|
mutex_init(&mdsc->mutex);
|
|
mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
|
|
init_completion(&mdsc->safe_umount_waiters);
|
|
init_completion(&mdsc->session_close_waiters);
|
|
INIT_LIST_HEAD(&mdsc->waiting_for_map);
|
|
mdsc->sessions = NULL;
|
|
mdsc->max_sessions = 0;
|
|
mdsc->stopping = 0;
|
|
init_rwsem(&mdsc->snap_rwsem);
|
|
mdsc->snap_realms = RB_ROOT;
|
|
INIT_LIST_HEAD(&mdsc->snap_empty);
|
|
spin_lock_init(&mdsc->snap_empty_lock);
|
|
mdsc->last_tid = 0;
|
|
mdsc->request_tree = RB_ROOT;
|
|
INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
|
|
mdsc->last_renew_caps = jiffies;
|
|
INIT_LIST_HEAD(&mdsc->cap_delay_list);
|
|
spin_lock_init(&mdsc->cap_delay_lock);
|
|
INIT_LIST_HEAD(&mdsc->snap_flush_list);
|
|
spin_lock_init(&mdsc->snap_flush_lock);
|
|
mdsc->cap_flush_seq = 0;
|
|
INIT_LIST_HEAD(&mdsc->cap_dirty);
|
|
mdsc->num_cap_flushing = 0;
|
|
spin_lock_init(&mdsc->cap_dirty_lock);
|
|
init_waitqueue_head(&mdsc->cap_flushing_wq);
|
|
spin_lock_init(&mdsc->dentry_lru_lock);
|
|
INIT_LIST_HEAD(&mdsc->dentry_lru);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Wait for safe replies on open mds requests. If we time out, drop
|
|
* all requests from the tree to avoid dangling dentry refs.
|
|
*/
|
|
static void wait_requests(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_mds_request *req;
|
|
struct ceph_client *client = mdsc->client;
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
if (__get_oldest_req(mdsc)) {
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
dout("wait_requests waiting for requests\n");
|
|
wait_for_completion_timeout(&mdsc->safe_umount_waiters,
|
|
client->mount_args->mount_timeout * HZ);
|
|
|
|
/* tear down remaining requests */
|
|
mutex_lock(&mdsc->mutex);
|
|
while ((req = __get_oldest_req(mdsc))) {
|
|
dout("wait_requests timed out on tid %llu\n",
|
|
req->r_tid);
|
|
__unregister_request(mdsc, req);
|
|
}
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("wait_requests done\n");
|
|
}
|
|
|
|
/*
|
|
* called before mount is ro, and before dentries are torn down.
|
|
* (hmm, does this still race with new lookups?)
|
|
*/
|
|
void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
|
|
{
|
|
dout("pre_umount\n");
|
|
mdsc->stopping = 1;
|
|
|
|
drop_leases(mdsc);
|
|
ceph_flush_dirty_caps(mdsc);
|
|
wait_requests(mdsc);
|
|
}
|
|
|
|
/*
|
|
* wait for all write mds requests to flush.
|
|
*/
|
|
static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
|
|
{
|
|
struct ceph_mds_request *req = NULL, *nextreq;
|
|
struct rb_node *n;
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
dout("wait_unsafe_requests want %lld\n", want_tid);
|
|
restart:
|
|
req = __get_oldest_req(mdsc);
|
|
while (req && req->r_tid <= want_tid) {
|
|
/* find next request */
|
|
n = rb_next(&req->r_node);
|
|
if (n)
|
|
nextreq = rb_entry(n, struct ceph_mds_request, r_node);
|
|
else
|
|
nextreq = NULL;
|
|
if ((req->r_op & CEPH_MDS_OP_WRITE)) {
|
|
/* write op */
|
|
ceph_mdsc_get_request(req);
|
|
if (nextreq)
|
|
ceph_mdsc_get_request(nextreq);
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("wait_unsafe_requests wait on %llu (want %llu)\n",
|
|
req->r_tid, want_tid);
|
|
wait_for_completion(&req->r_safe_completion);
|
|
mutex_lock(&mdsc->mutex);
|
|
ceph_mdsc_put_request(req);
|
|
if (!nextreq)
|
|
break; /* next dne before, so we're done! */
|
|
if (RB_EMPTY_NODE(&nextreq->r_node)) {
|
|
/* next request was removed from tree */
|
|
ceph_mdsc_put_request(nextreq);
|
|
goto restart;
|
|
}
|
|
ceph_mdsc_put_request(nextreq); /* won't go away */
|
|
}
|
|
req = nextreq;
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("wait_unsafe_requests done\n");
|
|
}
|
|
|
|
void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
|
|
{
|
|
u64 want_tid, want_flush;
|
|
|
|
dout("sync\n");
|
|
mutex_lock(&mdsc->mutex);
|
|
want_tid = mdsc->last_tid;
|
|
want_flush = mdsc->cap_flush_seq;
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
|
|
|
|
ceph_flush_dirty_caps(mdsc);
|
|
|
|
wait_unsafe_requests(mdsc, want_tid);
|
|
wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
|
|
}
|
|
|
|
|
|
/*
|
|
* called after sb is ro.
|
|
*/
|
|
void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_mds_session *session;
|
|
int i;
|
|
int n;
|
|
struct ceph_client *client = mdsc->client;
|
|
unsigned long started, timeout = client->mount_args->mount_timeout * HZ;
|
|
|
|
dout("close_sessions\n");
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
|
|
/* close sessions */
|
|
started = jiffies;
|
|
while (time_before(jiffies, started + timeout)) {
|
|
dout("closing sessions\n");
|
|
n = 0;
|
|
for (i = 0; i < mdsc->max_sessions; i++) {
|
|
session = __ceph_lookup_mds_session(mdsc, i);
|
|
if (!session)
|
|
continue;
|
|
mutex_unlock(&mdsc->mutex);
|
|
mutex_lock(&session->s_mutex);
|
|
__close_session(mdsc, session);
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
mutex_lock(&mdsc->mutex);
|
|
n++;
|
|
}
|
|
if (n == 0)
|
|
break;
|
|
|
|
if (client->mount_state == CEPH_MOUNT_SHUTDOWN)
|
|
break;
|
|
|
|
dout("waiting for sessions to close\n");
|
|
mutex_unlock(&mdsc->mutex);
|
|
wait_for_completion_timeout(&mdsc->session_close_waiters,
|
|
timeout);
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
|
|
/* tear down remaining sessions */
|
|
for (i = 0; i < mdsc->max_sessions; i++) {
|
|
if (mdsc->sessions[i]) {
|
|
session = get_session(mdsc->sessions[i]);
|
|
__unregister_session(mdsc, session);
|
|
mutex_unlock(&mdsc->mutex);
|
|
mutex_lock(&session->s_mutex);
|
|
remove_session_caps(session);
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
}
|
|
|
|
WARN_ON(!list_empty(&mdsc->cap_delay_list));
|
|
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
ceph_cleanup_empty_realms(mdsc);
|
|
|
|
cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
|
|
|
|
dout("stopped\n");
|
|
}
|
|
|
|
void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
|
|
{
|
|
dout("stop\n");
|
|
cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
|
|
if (mdsc->mdsmap)
|
|
ceph_mdsmap_destroy(mdsc->mdsmap);
|
|
kfree(mdsc->sessions);
|
|
}
|
|
|
|
|
|
/*
|
|
* handle mds map update.
|
|
*/
|
|
void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
|
|
{
|
|
u32 epoch;
|
|
u32 maplen;
|
|
void *p = msg->front.iov_base;
|
|
void *end = p + msg->front.iov_len;
|
|
struct ceph_mdsmap *newmap, *oldmap;
|
|
struct ceph_fsid fsid;
|
|
int err = -EINVAL;
|
|
|
|
ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
|
|
ceph_decode_copy(&p, &fsid, sizeof(fsid));
|
|
if (ceph_check_fsid(mdsc->client, &fsid) < 0)
|
|
return;
|
|
epoch = ceph_decode_32(&p);
|
|
maplen = ceph_decode_32(&p);
|
|
dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
|
|
|
|
/* do we need it? */
|
|
ceph_monc_got_mdsmap(&mdsc->client->monc, epoch);
|
|
mutex_lock(&mdsc->mutex);
|
|
if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
|
|
dout("handle_map epoch %u <= our %u\n",
|
|
epoch, mdsc->mdsmap->m_epoch);
|
|
mutex_unlock(&mdsc->mutex);
|
|
return;
|
|
}
|
|
|
|
newmap = ceph_mdsmap_decode(&p, end);
|
|
if (IS_ERR(newmap)) {
|
|
err = PTR_ERR(newmap);
|
|
goto bad_unlock;
|
|
}
|
|
|
|
/* swap into place */
|
|
if (mdsc->mdsmap) {
|
|
oldmap = mdsc->mdsmap;
|
|
mdsc->mdsmap = newmap;
|
|
check_new_map(mdsc, newmap, oldmap);
|
|
ceph_mdsmap_destroy(oldmap);
|
|
} else {
|
|
mdsc->mdsmap = newmap; /* first mds map */
|
|
}
|
|
mdsc->client->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
|
|
|
|
__wake_requests(mdsc, &mdsc->waiting_for_map);
|
|
|
|
mutex_unlock(&mdsc->mutex);
|
|
schedule_delayed(mdsc);
|
|
return;
|
|
|
|
bad_unlock:
|
|
mutex_unlock(&mdsc->mutex);
|
|
bad:
|
|
pr_err("error decoding mdsmap %d\n", err);
|
|
return;
|
|
}
|
|
|
|
static struct ceph_connection *con_get(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
|
|
if (get_session(s)) {
|
|
dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
|
|
return con;
|
|
}
|
|
dout("mdsc con_get %p FAIL\n", s);
|
|
return NULL;
|
|
}
|
|
|
|
static void con_put(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
|
|
ceph_put_mds_session(s);
|
|
dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref));
|
|
}
|
|
|
|
/*
|
|
* if the client is unresponsive for long enough, the mds will kill
|
|
* the session entirely.
|
|
*/
|
|
static void peer_reset(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
|
|
pr_err("mds%d gave us the boot. IMPLEMENT RECONNECT.\n",
|
|
s->s_mds);
|
|
}
|
|
|
|
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
int type = le16_to_cpu(msg->hdr.type);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
if (__verify_registered_session(mdsc, s) < 0) {
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
switch (type) {
|
|
case CEPH_MSG_MDS_MAP:
|
|
ceph_mdsc_handle_map(mdsc, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_SESSION:
|
|
handle_session(s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_REPLY:
|
|
handle_reply(s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_REQUEST_FORWARD:
|
|
handle_forward(mdsc, s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_CAPS:
|
|
ceph_handle_caps(s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_SNAP:
|
|
ceph_handle_snap(mdsc, s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_LEASE:
|
|
handle_lease(mdsc, s, msg);
|
|
break;
|
|
|
|
default:
|
|
pr_err("received unknown message type %d %s\n", type,
|
|
ceph_msg_type_name(type));
|
|
}
|
|
out:
|
|
ceph_msg_put(msg);
|
|
}
|
|
|
|
/*
|
|
* authentication
|
|
*/
|
|
static int get_authorizer(struct ceph_connection *con,
|
|
void **buf, int *len, int *proto,
|
|
void **reply_buf, int *reply_len, int force_new)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
struct ceph_auth_client *ac = mdsc->client->monc.auth;
|
|
int ret = 0;
|
|
|
|
if (force_new && s->s_authorizer) {
|
|
ac->ops->destroy_authorizer(ac, s->s_authorizer);
|
|
s->s_authorizer = NULL;
|
|
}
|
|
if (s->s_authorizer == NULL) {
|
|
if (ac->ops->create_authorizer) {
|
|
ret = ac->ops->create_authorizer(
|
|
ac, CEPH_ENTITY_TYPE_MDS,
|
|
&s->s_authorizer,
|
|
&s->s_authorizer_buf,
|
|
&s->s_authorizer_buf_len,
|
|
&s->s_authorizer_reply_buf,
|
|
&s->s_authorizer_reply_buf_len);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
*proto = ac->protocol;
|
|
*buf = s->s_authorizer_buf;
|
|
*len = s->s_authorizer_buf_len;
|
|
*reply_buf = s->s_authorizer_reply_buf;
|
|
*reply_len = s->s_authorizer_reply_buf_len;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int verify_authorizer_reply(struct ceph_connection *con, int len)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
struct ceph_auth_client *ac = mdsc->client->monc.auth;
|
|
|
|
return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len);
|
|
}
|
|
|
|
static int invalidate_authorizer(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
struct ceph_auth_client *ac = mdsc->client->monc.auth;
|
|
|
|
if (ac->ops->invalidate_authorizer)
|
|
ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
|
|
|
|
return ceph_monc_validate_auth(&mdsc->client->monc);
|
|
}
|
|
|
|
const static struct ceph_connection_operations mds_con_ops = {
|
|
.get = con_get,
|
|
.put = con_put,
|
|
.dispatch = dispatch,
|
|
.get_authorizer = get_authorizer,
|
|
.verify_authorizer_reply = verify_authorizer_reply,
|
|
.invalidate_authorizer = invalidate_authorizer,
|
|
.peer_reset = peer_reset,
|
|
};
|
|
|
|
|
|
|
|
|
|
/* eof */
|