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alistair23-linux/fs/ceph/super.c
Jeff Layton 2ccb45462a ceph: perform asynchronous unlink if we have sufficient caps 
The MDS is getting a new lock-caching facility that will allow it
to cache the necessary locks to allow asynchronous directory operations.
Since the CEPH_CAP_FILE_* caps are currently unused on directories,
we can repurpose those bits for this purpose.

When performing an unlink, if we have Fx on the parent directory,
and CEPH_CAP_DIR_UNLINK (aka Fr), and we know that the dentry being
removed is the primary link, then then we can fire off an unlink
request immediately and don't need to wait on reply before returning.

In that situation, just fix up the dcache and link count and return
immediately after issuing the call to the MDS. This does mean that we
need to hold an extra reference to the inode being unlinked, and extra
references to the caps to avoid races. Those references are put and
error handling is done in the r_callback routine.

If the operation ends up failing, then set a writeback error on the
directory inode, and the inode itself that can be fetched later by
an fsync on the dir.

The behavior of dir caps is slightly different from caps on normal
files. Because these are just considered an optimization, if the
session is reconnected, we will not automatically reclaim them. They
are instead considered lost until we do another synchronous op in the
parent directory.

Async dirops are enabled via the "nowsync" mount option, which is
patterned after the xfs "wsync" mount option. For now, the default
is "wsync", but eventually we may flip that.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2020-03-30 12:42:42 +02:00

1293 lines
32 KiB
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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/ceph/ceph_debug.h>
#include <linux/backing-dev.h>
#include <linux/ctype.h>
#include <linux/fs.h>
#include <linux/inet.h>
#include <linux/in6.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/statfs.h>
#include <linux/string.h>
#include "super.h"
#include "mds_client.h"
#include "cache.h"
#include <linux/ceph/ceph_features.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/mon_client.h>
#include <linux/ceph/auth.h>
#include <linux/ceph/debugfs.h>
/*
* Ceph superblock operations
*
* Handle the basics of mounting, unmounting.
*/
/*
* super ops
*/
static void ceph_put_super(struct super_block *s)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(s);
dout("put_super\n");
ceph_mdsc_close_sessions(fsc->mdsc);
}
static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry));
struct ceph_mon_client *monc = &fsc->client->monc;
struct ceph_statfs st;
u64 fsid;
int err;
u64 data_pool;
if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) {
data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0];
} else {
data_pool = CEPH_NOPOOL;
}
dout("statfs\n");
err = ceph_monc_do_statfs(monc, data_pool, &st);
if (err < 0)
return err;
/* fill in kstatfs */
buf->f_type = CEPH_SUPER_MAGIC; /* ?? */
/*
* express utilization in terms of large blocks to avoid
* overflow on 32-bit machines.
*
* NOTE: for the time being, we make bsize == frsize to humor
* not-yet-ancient versions of glibc that are broken.
* Someday, we will probably want to report a real block
* size... whatever that may mean for a network file system!
*/
buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
buf->f_frsize = 1 << CEPH_BLOCK_SHIFT;
/*
* By default use root quota for stats; fallback to overall filesystem
* usage if using 'noquotadf' mount option or if the root dir doesn't
* have max_bytes quota set.
*/
if (ceph_test_mount_opt(fsc, NOQUOTADF) ||
!ceph_quota_update_statfs(fsc, buf)) {
buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10);
}
buf->f_files = le64_to_cpu(st.num_objects);
buf->f_ffree = -1;
buf->f_namelen = NAME_MAX;
/* Must convert the fsid, for consistent values across arches */
mutex_lock(&monc->mutex);
fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^
le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1));
mutex_unlock(&monc->mutex);
buf->f_fsid.val[0] = fsid & 0xffffffff;
buf->f_fsid.val[1] = fsid >> 32;
return 0;
}
static int ceph_sync_fs(struct super_block *sb, int wait)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
if (!wait) {
dout("sync_fs (non-blocking)\n");
ceph_flush_dirty_caps(fsc->mdsc);
dout("sync_fs (non-blocking) done\n");
return 0;
}
dout("sync_fs (blocking)\n");
ceph_osdc_sync(&fsc->client->osdc);
ceph_mdsc_sync(fsc->mdsc);
dout("sync_fs (blocking) done\n");
return 0;
}
/*
* mount options
*/
enum {
Opt_wsize,
Opt_rsize,
Opt_rasize,
Opt_caps_wanted_delay_min,
Opt_caps_wanted_delay_max,
Opt_caps_max,
Opt_readdir_max_entries,
Opt_readdir_max_bytes,
Opt_congestion_kb,
/* int args above */
Opt_snapdirname,
Opt_mds_namespace,
Opt_recover_session,
Opt_source,
/* string args above */
Opt_dirstat,
Opt_rbytes,
Opt_asyncreaddir,
Opt_dcache,
Opt_ino32,
Opt_fscache,
Opt_poolperm,
Opt_require_active_mds,
Opt_acl,
Opt_quotadf,
Opt_copyfrom,
Opt_wsync,
};
enum ceph_recover_session_mode {
ceph_recover_session_no,
ceph_recover_session_clean
};
static const struct constant_table ceph_param_recover[] = {
{ "no", ceph_recover_session_no },
{ "clean", ceph_recover_session_clean },
{}
};
static const struct fs_parameter_spec ceph_mount_parameters[] = {
fsparam_flag_no ("acl", Opt_acl),
fsparam_flag_no ("asyncreaddir", Opt_asyncreaddir),
fsparam_s32 ("caps_max", Opt_caps_max),
fsparam_u32 ("caps_wanted_delay_max", Opt_caps_wanted_delay_max),
fsparam_u32 ("caps_wanted_delay_min", Opt_caps_wanted_delay_min),
fsparam_u32 ("write_congestion_kb", Opt_congestion_kb),
fsparam_flag_no ("copyfrom", Opt_copyfrom),
fsparam_flag_no ("dcache", Opt_dcache),
fsparam_flag_no ("dirstat", Opt_dirstat),
fsparam_flag_no ("fsc", Opt_fscache), // fsc|nofsc
fsparam_string ("fsc", Opt_fscache), // fsc=...
fsparam_flag_no ("ino32", Opt_ino32),
fsparam_string ("mds_namespace", Opt_mds_namespace),
fsparam_flag_no ("poolperm", Opt_poolperm),
fsparam_flag_no ("quotadf", Opt_quotadf),
fsparam_u32 ("rasize", Opt_rasize),
fsparam_flag_no ("rbytes", Opt_rbytes),
fsparam_u32 ("readdir_max_bytes", Opt_readdir_max_bytes),
fsparam_u32 ("readdir_max_entries", Opt_readdir_max_entries),
fsparam_enum ("recover_session", Opt_recover_session, ceph_param_recover),
fsparam_flag_no ("require_active_mds", Opt_require_active_mds),
fsparam_u32 ("rsize", Opt_rsize),
fsparam_string ("snapdirname", Opt_snapdirname),
fsparam_string ("source", Opt_source),
fsparam_u32 ("wsize", Opt_wsize),
fsparam_flag_no ("wsync", Opt_wsync),
{}
};
struct ceph_parse_opts_ctx {
struct ceph_options *copts;
struct ceph_mount_options *opts;
};
/*
* Remove adjacent slashes and then the trailing slash, unless it is
* the only remaining character.
*
* E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
*/
static void canonicalize_path(char *path)
{
int i, j = 0;
for (i = 0; path[i] != '\0'; i++) {
if (path[i] != '/' || j < 1 || path[j - 1] != '/')
path[j++] = path[i];
}
if (j > 1 && path[j - 1] == '/')
j--;
path[j] = '\0';
}
/*
* Parse the source parameter. Distinguish the server list from the path.
*
* The source will look like:
* <server_spec>[,<server_spec>...]:[<path>]
* where
* <server_spec> is <ip>[:<port>]
* <path> is optional, but if present must begin with '/'
*/
static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct ceph_mount_options *fsopt = pctx->opts;
char *dev_name = param->string, *dev_name_end;
int ret;
dout("%s '%s'\n", __func__, dev_name);
if (!dev_name || !*dev_name)
return invalfc(fc, "Empty source");
dev_name_end = strchr(dev_name, '/');
if (dev_name_end) {
/*
* The server_path will include the whole chars from userland
* including the leading '/'.
*/
kfree(fsopt->server_path);
fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
if (!fsopt->server_path)
return -ENOMEM;
canonicalize_path(fsopt->server_path);
} else {
dev_name_end = dev_name + strlen(dev_name);
}
dev_name_end--; /* back up to ':' separator */
if (dev_name_end < dev_name || *dev_name_end != ':')
return invalfc(fc, "No path or : separator in source");
dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name);
if (fsopt->server_path)
dout("server path '%s'\n", fsopt->server_path);
ret = ceph_parse_mon_ips(param->string, dev_name_end - dev_name,
pctx->copts, fc->log.log);
if (ret)
return ret;
fc->source = param->string;
param->string = NULL;
return 0;
}
static int ceph_parse_mount_param(struct fs_context *fc,
struct fs_parameter *param)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct ceph_mount_options *fsopt = pctx->opts;
struct fs_parse_result result;
unsigned int mode;
int token, ret;
ret = ceph_parse_param(param, pctx->copts, fc->log.log);
if (ret != -ENOPARAM)
return ret;
token = fs_parse(fc, ceph_mount_parameters, param, &result);
dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
if (token < 0)
return token;
switch (token) {
case Opt_snapdirname:
kfree(fsopt->snapdir_name);
fsopt->snapdir_name = param->string;
param->string = NULL;
break;
case Opt_mds_namespace:
kfree(fsopt->mds_namespace);
fsopt->mds_namespace = param->string;
param->string = NULL;
break;
case Opt_recover_session:
mode = result.uint_32;
if (mode == ceph_recover_session_no)
fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
else if (mode == ceph_recover_session_clean)
fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
else
BUG();
break;
case Opt_source:
if (fc->source)
return invalfc(fc, "Multiple sources specified");
return ceph_parse_source(param, fc);
case Opt_wsize:
if (result.uint_32 < PAGE_SIZE ||
result.uint_32 > CEPH_MAX_WRITE_SIZE)
goto out_of_range;
fsopt->wsize = ALIGN(result.uint_32, PAGE_SIZE);
break;
case Opt_rsize:
if (result.uint_32 < PAGE_SIZE ||
result.uint_32 > CEPH_MAX_READ_SIZE)
goto out_of_range;
fsopt->rsize = ALIGN(result.uint_32, PAGE_SIZE);
break;
case Opt_rasize:
fsopt->rasize = ALIGN(result.uint_32, PAGE_SIZE);
break;
case Opt_caps_wanted_delay_min:
if (result.uint_32 < 1)
goto out_of_range;
fsopt->caps_wanted_delay_min = result.uint_32;
break;
case Opt_caps_wanted_delay_max:
if (result.uint_32 < 1)
goto out_of_range;
fsopt->caps_wanted_delay_max = result.uint_32;
break;
case Opt_caps_max:
if (result.int_32 < 0)
goto out_of_range;
fsopt->caps_max = result.int_32;
break;
case Opt_readdir_max_entries:
if (result.uint_32 < 1)
goto out_of_range;
fsopt->max_readdir = result.uint_32;
break;
case Opt_readdir_max_bytes:
if (result.uint_32 < PAGE_SIZE && result.uint_32 != 0)
goto out_of_range;
fsopt->max_readdir_bytes = result.uint_32;
break;
case Opt_congestion_kb:
if (result.uint_32 < 1024) /* at least 1M */
goto out_of_range;
fsopt->congestion_kb = result.uint_32;
break;
case Opt_dirstat:
if (!result.negated)
fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT;
else
fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT;
break;
case Opt_rbytes:
if (!result.negated)
fsopt->flags |= CEPH_MOUNT_OPT_RBYTES;
else
fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES;
break;
case Opt_asyncreaddir:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR;
else
fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR;
break;
case Opt_dcache:
if (!result.negated)
fsopt->flags |= CEPH_MOUNT_OPT_DCACHE;
else
fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE;
break;
case Opt_ino32:
if (!result.negated)
fsopt->flags |= CEPH_MOUNT_OPT_INO32;
else
fsopt->flags &= ~CEPH_MOUNT_OPT_INO32;
break;
case Opt_fscache:
#ifdef CONFIG_CEPH_FSCACHE
kfree(fsopt->fscache_uniq);
fsopt->fscache_uniq = NULL;
if (result.negated) {
fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE;
} else {
fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE;
fsopt->fscache_uniq = param->string;
param->string = NULL;
}
break;
#else
return invalfc(fc, "fscache support is disabled");
#endif
case Opt_poolperm:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM;
else
fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM;
break;
case Opt_require_active_mds:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT;
else
fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT;
break;
case Opt_quotadf:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF;
else
fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF;
break;
case Opt_copyfrom:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM;
else
fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM;
break;
case Opt_acl:
if (!result.negated) {
#ifdef CONFIG_CEPH_FS_POSIX_ACL
fc->sb_flags |= SB_POSIXACL;
#else
return invalfc(fc, "POSIX ACL support is disabled");
#endif
} else {
fc->sb_flags &= ~SB_POSIXACL;
}
break;
case Opt_wsync:
if (!result.negated)
fsopt->flags &= ~CEPH_MOUNT_OPT_ASYNC_DIROPS;
else
fsopt->flags |= CEPH_MOUNT_OPT_ASYNC_DIROPS;
break;
default:
BUG();
}
return 0;
out_of_range:
return invalfc(fc, "%s out of range", param->key);
}
static void destroy_mount_options(struct ceph_mount_options *args)
{
dout("destroy_mount_options %p\n", args);
if (!args)
return;
kfree(args->snapdir_name);
kfree(args->mds_namespace);
kfree(args->server_path);
kfree(args->fscache_uniq);
kfree(args);
}
static int strcmp_null(const char *s1, const char *s2)
{
if (!s1 && !s2)
return 0;
if (s1 && !s2)
return -1;
if (!s1 && s2)
return 1;
return strcmp(s1, s2);
}
static int compare_mount_options(struct ceph_mount_options *new_fsopt,
struct ceph_options *new_opt,
struct ceph_fs_client *fsc)
{
struct ceph_mount_options *fsopt1 = new_fsopt;
struct ceph_mount_options *fsopt2 = fsc->mount_options;
int ofs = offsetof(struct ceph_mount_options, snapdir_name);
int ret;
ret = memcmp(fsopt1, fsopt2, ofs);
if (ret)
return ret;
ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
if (ret)
return ret;
ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
if (ret)
return ret;
ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
if (ret)
return ret;
ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq);
if (ret)
return ret;
return ceph_compare_options(new_opt, fsc->client);
}
/**
* ceph_show_options - Show mount options in /proc/mounts
* @m: seq_file to write to
* @root: root of that (sub)tree
*/
static int ceph_show_options(struct seq_file *m, struct dentry *root)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb);
struct ceph_mount_options *fsopt = fsc->mount_options;
size_t pos;
int ret;
/* a comma between MNT/MS and client options */
seq_putc(m, ',');
pos = m->count;
ret = ceph_print_client_options(m, fsc->client, false);
if (ret)
return ret;
/* retract our comma if no client options */
if (m->count == pos)
m->count--;
if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT)
seq_puts(m, ",dirstat");
if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES))
seq_puts(m, ",rbytes");
if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR)
seq_puts(m, ",noasyncreaddir");
if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0)
seq_puts(m, ",nodcache");
if (fsopt->flags & CEPH_MOUNT_OPT_INO32)
seq_puts(m, ",ino32");
if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) {
seq_show_option(m, "fsc", fsopt->fscache_uniq);
}
if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM)
seq_puts(m, ",nopoolperm");
if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF)
seq_puts(m, ",noquotadf");
#ifdef CONFIG_CEPH_FS_POSIX_ACL
if (root->d_sb->s_flags & SB_POSIXACL)
seq_puts(m, ",acl");
else
seq_puts(m, ",noacl");
#endif
if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0)
seq_puts(m, ",copyfrom");
if (fsopt->mds_namespace)
seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
seq_show_option(m, "recover_session", "clean");
if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
seq_puts(m, ",nowsync");
if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
seq_printf(m, ",wsize=%u", fsopt->wsize);
if (fsopt->rsize != CEPH_MAX_READ_SIZE)
seq_printf(m, ",rsize=%u", fsopt->rsize);
if (fsopt->rasize != CEPH_RASIZE_DEFAULT)
seq_printf(m, ",rasize=%u", fsopt->rasize);
if (fsopt->congestion_kb != default_congestion_kb())
seq_printf(m, ",write_congestion_kb=%u", fsopt->congestion_kb);
if (fsopt->caps_max)
seq_printf(m, ",caps_max=%d", fsopt->caps_max);
if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
seq_printf(m, ",caps_wanted_delay_min=%u",
fsopt->caps_wanted_delay_min);
if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
seq_printf(m, ",caps_wanted_delay_max=%u",
fsopt->caps_wanted_delay_max);
if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT)
seq_printf(m, ",readdir_max_entries=%u", fsopt->max_readdir);
if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
seq_printf(m, ",readdir_max_bytes=%u", fsopt->max_readdir_bytes);
if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
seq_show_option(m, "snapdirname", fsopt->snapdir_name);
return 0;
}
/*
* handle any mon messages the standard library doesn't understand.
* return error if we don't either.
*/
static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg)
{
struct ceph_fs_client *fsc = client->private;
int type = le16_to_cpu(msg->hdr.type);
switch (type) {
case CEPH_MSG_MDS_MAP:
ceph_mdsc_handle_mdsmap(fsc->mdsc, msg);
return 0;
case CEPH_MSG_FS_MAP_USER:
ceph_mdsc_handle_fsmap(fsc->mdsc, msg);
return 0;
default:
return -1;
}
}
/*
* create a new fs client
*
* Success or not, this function consumes @fsopt and @opt.
*/
static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
struct ceph_options *opt)
{
struct ceph_fs_client *fsc;
int page_count;
size_t size;
int err;
fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
if (!fsc) {
err = -ENOMEM;
goto fail;
}
fsc->client = ceph_create_client(opt, fsc);
if (IS_ERR(fsc->client)) {
err = PTR_ERR(fsc->client);
goto fail;
}
opt = NULL; /* fsc->client now owns this */
fsc->client->extra_mon_dispatch = extra_mon_dispatch;
ceph_set_opt(fsc->client, ABORT_ON_FULL);
if (!fsopt->mds_namespace) {
ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
0, true);
} else {
ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP,
0, false);
}
fsc->mount_options = fsopt;
fsc->sb = NULL;
fsc->mount_state = CEPH_MOUNT_MOUNTING;
fsc->filp_gen = 1;
fsc->have_copy_from2 = true;
atomic_long_set(&fsc->writeback_count, 0);
err = -ENOMEM;
/*
* The number of concurrent works can be high but they don't need
* to be processed in parallel, limit concurrency.
*/
fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0);
if (!fsc->inode_wq)
goto fail_client;
fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1);
if (!fsc->cap_wq)
goto fail_inode_wq;
/* set up mempools */
err = -ENOMEM;
page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
size = sizeof (struct page *) * (page_count ? page_count : 1);
fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
if (!fsc->wb_pagevec_pool)
goto fail_cap_wq;
return fsc;
fail_cap_wq:
destroy_workqueue(fsc->cap_wq);
fail_inode_wq:
destroy_workqueue(fsc->inode_wq);
fail_client:
ceph_destroy_client(fsc->client);
fail:
kfree(fsc);
if (opt)
ceph_destroy_options(opt);
destroy_mount_options(fsopt);
return ERR_PTR(err);
}
static void flush_fs_workqueues(struct ceph_fs_client *fsc)
{
flush_workqueue(fsc->inode_wq);
flush_workqueue(fsc->cap_wq);
}
static void destroy_fs_client(struct ceph_fs_client *fsc)
{
dout("destroy_fs_client %p\n", fsc);
ceph_mdsc_destroy(fsc);
destroy_workqueue(fsc->inode_wq);
destroy_workqueue(fsc->cap_wq);
mempool_destroy(fsc->wb_pagevec_pool);
destroy_mount_options(fsc->mount_options);
ceph_destroy_client(fsc->client);
kfree(fsc);
dout("destroy_fs_client %p done\n", fsc);
}
/*
* caches
*/
struct kmem_cache *ceph_inode_cachep;
struct kmem_cache *ceph_cap_cachep;
struct kmem_cache *ceph_cap_flush_cachep;
struct kmem_cache *ceph_dentry_cachep;
struct kmem_cache *ceph_file_cachep;
struct kmem_cache *ceph_dir_file_cachep;
struct kmem_cache *ceph_mds_request_cachep;
static void ceph_inode_init_once(void *foo)
{
struct ceph_inode_info *ci = foo;
inode_init_once(&ci->vfs_inode);
}
static int __init init_caches(void)
{
int error = -ENOMEM;
ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
sizeof(struct ceph_inode_info),
__alignof__(struct ceph_inode_info),
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
SLAB_ACCOUNT, ceph_inode_init_once);
if (!ceph_inode_cachep)
return -ENOMEM;
ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
if (!ceph_cap_cachep)
goto bad_cap;
ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
if (!ceph_cap_flush_cachep)
goto bad_cap_flush;
ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
if (!ceph_dentry_cachep)
goto bad_dentry;
ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
if (!ceph_file_cachep)
goto bad_file;
ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
if (!ceph_dir_file_cachep)
goto bad_dir_file;
ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, SLAB_MEM_SPREAD);
if (!ceph_mds_request_cachep)
goto bad_mds_req;
error = ceph_fscache_register();
if (error)
goto bad_fscache;
return 0;
bad_fscache:
kmem_cache_destroy(ceph_mds_request_cachep);
bad_mds_req:
kmem_cache_destroy(ceph_dir_file_cachep);
bad_dir_file:
kmem_cache_destroy(ceph_file_cachep);
bad_file:
kmem_cache_destroy(ceph_dentry_cachep);
bad_dentry:
kmem_cache_destroy(ceph_cap_flush_cachep);
bad_cap_flush:
kmem_cache_destroy(ceph_cap_cachep);
bad_cap:
kmem_cache_destroy(ceph_inode_cachep);
return error;
}
static void destroy_caches(void)
{
/*
* Make sure all delayed rcu free inodes are flushed before we
* destroy cache.
*/
rcu_barrier();
kmem_cache_destroy(ceph_inode_cachep);
kmem_cache_destroy(ceph_cap_cachep);
kmem_cache_destroy(ceph_cap_flush_cachep);
kmem_cache_destroy(ceph_dentry_cachep);
kmem_cache_destroy(ceph_file_cachep);
kmem_cache_destroy(ceph_dir_file_cachep);
kmem_cache_destroy(ceph_mds_request_cachep);
ceph_fscache_unregister();
}
/*
* ceph_umount_begin - initiate forced umount. Tear down down the
* mount, skipping steps that may hang while waiting for server(s).
*/
static void ceph_umount_begin(struct super_block *sb)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
dout("ceph_umount_begin - starting forced umount\n");
if (!fsc)
return;
fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
ceph_mdsc_force_umount(fsc->mdsc);
fsc->filp_gen++; // invalidate open files
}
static const struct super_operations ceph_super_ops = {
.alloc_inode = ceph_alloc_inode,
.free_inode = ceph_free_inode,
.write_inode = ceph_write_inode,
.drop_inode = generic_delete_inode,
.evict_inode = ceph_evict_inode,
.sync_fs = ceph_sync_fs,
.put_super = ceph_put_super,
.show_options = ceph_show_options,
.statfs = ceph_statfs,
.umount_begin = ceph_umount_begin,
};
/*
* Bootstrap mount by opening the root directory. Note the mount
* @started time from caller, and time out if this takes too long.
*/
static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
const char *path,
unsigned long started)
{
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req = NULL;
int err;
struct dentry *root;
/* open dir */
dout("open_root_inode opening '%s'\n", path);
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
if (IS_ERR(req))
return ERR_CAST(req);
req->r_path1 = kstrdup(path, GFP_NOFS);
if (!req->r_path1) {
root = ERR_PTR(-ENOMEM);
goto out;
}
req->r_ino1.ino = CEPH_INO_ROOT;
req->r_ino1.snap = CEPH_NOSNAP;
req->r_started = started;
req->r_timeout = fsc->client->options->mount_timeout;
req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
req->r_num_caps = 2;
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (err == 0) {
struct inode *inode = req->r_target_inode;
req->r_target_inode = NULL;
dout("open_root_inode success\n");
root = d_make_root(inode);
if (!root) {
root = ERR_PTR(-ENOMEM);
goto out;
}
dout("open_root_inode success, root dentry is %p\n", root);
} else {
root = ERR_PTR(err);
}
out:
ceph_mdsc_put_request(req);
return root;
}
/*
* mount: join the ceph cluster, and open root directory.
*/
static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
struct fs_context *fc)
{
int err;
unsigned long started = jiffies; /* note the start time */
struct dentry *root;
dout("mount start %p\n", fsc);
mutex_lock(&fsc->client->mount_mutex);
if (!fsc->sb->s_root) {
const char *path = fsc->mount_options->server_path ?
fsc->mount_options->server_path + 1 : "";
err = __ceph_open_session(fsc->client, started);
if (err < 0)
goto out;
/* setup fscache */
if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) {
err = ceph_fscache_register_fs(fsc, fc);
if (err < 0)
goto out;
}
dout("mount opening path '%s'\n", path);
ceph_fs_debugfs_init(fsc);
root = open_root_dentry(fsc, path, started);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
}
fsc->sb->s_root = dget(root);
} else {
root = dget(fsc->sb->s_root);
}
fsc->mount_state = CEPH_MOUNT_MOUNTED;
dout("mount success\n");
mutex_unlock(&fsc->client->mount_mutex);
return root;
out:
mutex_unlock(&fsc->client->mount_mutex);
return ERR_PTR(err);
}
static int ceph_set_super(struct super_block *s, struct fs_context *fc)
{
struct ceph_fs_client *fsc = s->s_fs_info;
int ret;
dout("set_super %p\n", s);
s->s_maxbytes = MAX_LFS_FILESIZE;
s->s_xattr = ceph_xattr_handlers;
fsc->sb = s;
fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */
s->s_op = &ceph_super_ops;
s->s_d_op = &ceph_dentry_ops;
s->s_export_op = &ceph_export_ops;
s->s_time_gran = 1;
s->s_time_min = 0;
s->s_time_max = U32_MAX;
ret = set_anon_super_fc(s, fc);
if (ret != 0)
fsc->sb = NULL;
return ret;
}
/*
* share superblock if same fs AND options
*/
static int ceph_compare_super(struct super_block *sb, struct fs_context *fc)
{
struct ceph_fs_client *new = fc->s_fs_info;
struct ceph_mount_options *fsopt = new->mount_options;
struct ceph_options *opt = new->client->options;
struct ceph_fs_client *other = ceph_sb_to_client(sb);
dout("ceph_compare_super %p\n", sb);
if (compare_mount_options(fsopt, opt, other)) {
dout("monitor(s)/mount options don't match\n");
return 0;
}
if ((opt->flags & CEPH_OPT_FSID) &&
ceph_fsid_compare(&opt->fsid, &other->client->fsid)) {
dout("fsid doesn't match\n");
return 0;
}
if (fc->sb_flags != (sb->s_flags & ~SB_BORN)) {
dout("flags differ\n");
return 0;
}
return 1;
}
/*
* construct our own bdi so we can control readahead, etc.
*/
static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc)
{
int err;
err = super_setup_bdi_name(sb, "ceph-%ld",
atomic_long_inc_return(&bdi_seq));
if (err)
return err;
/* set ra_pages based on rasize mount option? */
sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT;
/* set io_pages based on max osd read size */
sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT;
return 0;
}
static int ceph_get_tree(struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct super_block *sb;
struct ceph_fs_client *fsc;
struct dentry *res;
int (*compare_super)(struct super_block *, struct fs_context *) =
ceph_compare_super;
int err;
dout("ceph_get_tree\n");
if (!fc->source)
return invalfc(fc, "No source");
/* create client (which we may/may not use) */
fsc = create_fs_client(pctx->opts, pctx->copts);
pctx->opts = NULL;
pctx->copts = NULL;
if (IS_ERR(fsc)) {
err = PTR_ERR(fsc);
goto out_final;
}
err = ceph_mdsc_init(fsc);
if (err < 0)
goto out;
if (ceph_test_opt(fsc->client, NOSHARE))
compare_super = NULL;
fc->s_fs_info = fsc;
sb = sget_fc(fc, compare_super, ceph_set_super);
fc->s_fs_info = NULL;
if (IS_ERR(sb)) {
err = PTR_ERR(sb);
goto out;
}
if (ceph_sb_to_client(sb) != fsc) {
destroy_fs_client(fsc);
fsc = ceph_sb_to_client(sb);
dout("get_sb got existing client %p\n", fsc);
} else {
dout("get_sb using new client %p\n", fsc);
err = ceph_setup_bdi(sb, fsc);
if (err < 0)
goto out_splat;
}
res = ceph_real_mount(fsc, fc);
if (IS_ERR(res)) {
err = PTR_ERR(res);
goto out_splat;
}
dout("root %p inode %p ino %llx.%llx\n", res,
d_inode(res), ceph_vinop(d_inode(res)));
fc->root = fsc->sb->s_root;
return 0;
out_splat:
if (!ceph_mdsmap_is_cluster_available(fsc->mdsc->mdsmap)) {
pr_info("No mds server is up or the cluster is laggy\n");
err = -EHOSTUNREACH;
}
ceph_mdsc_close_sessions(fsc->mdsc);
deactivate_locked_super(sb);
goto out_final;
out:
destroy_fs_client(fsc);
out_final:
dout("ceph_get_tree fail %d\n", err);
return err;
}
static void ceph_free_fc(struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
if (pctx) {
destroy_mount_options(pctx->opts);
ceph_destroy_options(pctx->copts);
kfree(pctx);
}
}
static int ceph_reconfigure_fc(struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct ceph_mount_options *fsopt = pctx->opts;
struct ceph_fs_client *fsc = ceph_sb_to_client(fc->root->d_sb);
if (fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)
ceph_set_mount_opt(fsc, ASYNC_DIROPS);
else
ceph_clear_mount_opt(fsc, ASYNC_DIROPS);
sync_filesystem(fc->root->d_sb);
return 0;
}
static const struct fs_context_operations ceph_context_ops = {
.free = ceph_free_fc,
.parse_param = ceph_parse_mount_param,
.get_tree = ceph_get_tree,
.reconfigure = ceph_reconfigure_fc,
};
/*
* Set up the filesystem mount context.
*/
static int ceph_init_fs_context(struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx;
struct ceph_mount_options *fsopt;
pctx = kzalloc(sizeof(*pctx), GFP_KERNEL);
if (!pctx)
return -ENOMEM;
pctx->copts = ceph_alloc_options();
if (!pctx->copts)
goto nomem;
pctx->opts = kzalloc(sizeof(*pctx->opts), GFP_KERNEL);
if (!pctx->opts)
goto nomem;
fsopt = pctx->opts;
fsopt->flags = CEPH_MOUNT_OPT_DEFAULT;
fsopt->wsize = CEPH_MAX_WRITE_SIZE;
fsopt->rsize = CEPH_MAX_READ_SIZE;
fsopt->rasize = CEPH_RASIZE_DEFAULT;
fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
if (!fsopt->snapdir_name)
goto nomem;
fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT;
fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
fsopt->congestion_kb = default_congestion_kb();
#ifdef CONFIG_CEPH_FS_POSIX_ACL
fc->sb_flags |= SB_POSIXACL;
#endif
fc->fs_private = pctx;
fc->ops = &ceph_context_ops;
return 0;
nomem:
destroy_mount_options(pctx->opts);
ceph_destroy_options(pctx->copts);
kfree(pctx);
return -ENOMEM;
}
static void ceph_kill_sb(struct super_block *s)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(s);
dev_t dev = s->s_dev;
dout("kill_sb %p\n", s);
ceph_mdsc_pre_umount(fsc->mdsc);
flush_fs_workqueues(fsc);
generic_shutdown_super(s);
fsc->client->extra_mon_dispatch = NULL;
ceph_fs_debugfs_cleanup(fsc);
ceph_fscache_unregister_fs(fsc);
destroy_fs_client(fsc);
free_anon_bdev(dev);
}
static struct file_system_type ceph_fs_type = {
.owner = THIS_MODULE,
.name = "ceph",
.init_fs_context = ceph_init_fs_context,
.kill_sb = ceph_kill_sb,
.fs_flags = FS_RENAME_DOES_D_MOVE,
};
MODULE_ALIAS_FS("ceph");
int ceph_force_reconnect(struct super_block *sb)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
int err = 0;
ceph_umount_begin(sb);
/* Make sure all page caches get invalidated.
* see remove_session_caps_cb() */
flush_workqueue(fsc->inode_wq);
/* In case that we were blacklisted. This also reset
* all mon/osd connections */
ceph_reset_client_addr(fsc->client);
ceph_osdc_clear_abort_err(&fsc->client->osdc);
fsc->blacklisted = false;
fsc->mount_state = CEPH_MOUNT_MOUNTED;
if (sb->s_root) {
err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
CEPH_STAT_CAP_INODE, true);
}
return err;
}
static int __init init_ceph(void)
{
int ret = init_caches();
if (ret)
goto out;
ceph_flock_init();
ret = register_filesystem(&ceph_fs_type);
if (ret)
goto out_caches;
pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL);
return 0;
out_caches:
destroy_caches();
out:
return ret;
}
static void __exit exit_ceph(void)
{
dout("exit_ceph\n");
unregister_filesystem(&ceph_fs_type);
destroy_caches();
}
module_init(init_ceph);
module_exit(exit_ceph);
MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
MODULE_DESCRIPTION("Ceph filesystem for Linux");
MODULE_LICENSE("GPL");
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