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ab58a5a1c0
linux/fs/ceph/super.c
Xiubo Li ab58a5a1c0 ceph: move to a dedicated slabcache for ceph_cap_snap 
There could be huge number of capsnaps around at any given time. On
x86_64 the structure is 248 bytes, which will be rounded up to 256 bytes
by kzalloc. Move this to a dedicated slabcache to save 8 bytes for each.

[ jlayton: use kmem_cache_zalloc ]

Signed-off-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2022-03-01 18:26:37 +01:00

1492 lines
38 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>
#include <uapi/linux/magic.h>
static DEFINE_SPINLOCK(ceph_fsc_lock);
static LIST_HEAD(ceph_fsc_list);
/*
* 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;
int i, 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 */
buf->f_fsid.val[0] = 0;
mutex_lock(&monc->mutex);
for (i = 0 ; i < sizeof(monc->monmap->fsid) / sizeof(__le32) ; ++i)
buf->f_fsid.val[0] ^= le32_to_cpu(((__le32 *)&monc->monmap->fsid)[i]);
mutex_unlock(&monc->mutex);
/* fold the fs_cluster_id into the upper bits */
buf->f_fsid.val[1] = monc->fs_cluster_id;
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,
Opt_mon_addr,
/* 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,
Opt_pagecache,
};
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_string ("mon_addr", Opt_mon_addr),
fsparam_u32 ("wsize", Opt_wsize),
fsparam_flag_no ("wsync", Opt_wsync),
fsparam_flag_no ("pagecache", Opt_pagecache),
{}
};
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';
}
/*
* Check if the mds namespace in ceph_mount_options matches
* the passed in namespace string. First time match (when
* ->mds_namespace is NULL) is treated specially, since
* ->mds_namespace needs to be initialized by the caller.
*/
static int namespace_equals(struct ceph_mount_options *fsopt,
const char *namespace, size_t len)
{
return !(fsopt->mds_namespace &&
(strlen(fsopt->mds_namespace) != len ||
strncmp(fsopt->mds_namespace, namespace, len)));
}
static int ceph_parse_old_source(const char *dev_name, const char *dev_name_end,
struct fs_context *fc)
{
int r;
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct ceph_mount_options *fsopt = pctx->opts;
if (*dev_name_end != ':')
return invalfc(fc, "separator ':' missing in source");
r = ceph_parse_mon_ips(dev_name, dev_name_end - dev_name,
pctx->copts, fc->log.log, ',');
if (r)
return r;
fsopt->new_dev_syntax = false;
return 0;
}
static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
struct fs_context *fc)
{
size_t len;
struct ceph_fsid fsid;
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct ceph_mount_options *fsopt = pctx->opts;
char *fsid_start, *fs_name_start;
if (*dev_name_end != '=') {
dout("separator '=' missing in source");
return -EINVAL;
}
fsid_start = strchr(dev_name, '@');
if (!fsid_start)
return invalfc(fc, "missing cluster fsid");
++fsid_start; /* start of cluster fsid */
fs_name_start = strchr(fsid_start, '.');
if (!fs_name_start)
return invalfc(fc, "missing file system name");
if (ceph_parse_fsid(fsid_start, &fsid))
return invalfc(fc, "Invalid FSID");
++fs_name_start; /* start of file system name */
len = dev_name_end - fs_name_start;
if (!namespace_equals(fsopt, fs_name_start, len))
return invalfc(fc, "Mismatching mds_namespace");
kfree(fsopt->mds_namespace);
fsopt->mds_namespace = kstrndup(fs_name_start, len, GFP_KERNEL);
if (!fsopt->mds_namespace)
return -ENOMEM;
dout("file system (mds namespace) '%s'\n", fsopt->mds_namespace);
fsopt->new_dev_syntax = true;
return 0;
}
/*
* Parse the source parameter for new device format. Distinguish the device
* spec from the path. Try parsing new device format and fallback to old
* format if needed.
*
* New device syntax will looks like:
* <device_spec>=/<path>
* where
* <device_spec> is name@fsid.fsname
* <path> is optional, but if present must begin with '/'
* (monitor addresses are passed via mount option)
*
* Old device syntax is:
* <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)
return invalfc(fc, "Path missing 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);
dout("trying new device syntax");
ret = ceph_parse_new_source(dev_name, dev_name_end, fc);
if (ret) {
if (ret != -EINVAL)
return ret;
dout("trying old device syntax");
ret = ceph_parse_old_source(dev_name, dev_name_end, fc);
if (ret)
return ret;
}
fc->source = param->string;
param->string = NULL;
return 0;
}
static int ceph_parse_mon_addr(struct fs_parameter *param,
struct fs_context *fc)
{
struct ceph_parse_opts_ctx *pctx = fc->fs_private;
struct ceph_mount_options *fsopt = pctx->opts;
kfree(fsopt->mon_addr);
fsopt->mon_addr = param->string;
param->string = NULL;
return ceph_parse_mon_ips(fsopt->mon_addr, strlen(fsopt->mon_addr),
pctx->copts, fc->log.log, '/');
}
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:
if (!namespace_equals(fsopt, param->string, strlen(param->string)))
return invalfc(fc, "Mismatching 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_mon_addr:
return ceph_parse_mon_addr(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;
case Opt_pagecache:
if (result.negated)
fsopt->flags |= CEPH_MOUNT_OPT_NOPAGECACHE;
else
fsopt->flags &= ~CEPH_MOUNT_OPT_NOPAGECACHE;
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->mon_addr);
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;
ret = strcmp_null(fsopt1->mon_addr, fsopt2->mon_addr);
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");
/* dump mds_namespace when old device syntax is in use */
if (fsopt->mds_namespace && !fsopt->new_dev_syntax)
seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
if (fsopt->mon_addr)
seq_printf(m, ",mon_addr=%s", fsopt->mon_addr);
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, ",wsync");
if (fsopt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
seq_puts(m, ",nopagecache");
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 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;
spin_lock(&ceph_fsc_lock);
list_add_tail(&fsc->metric_wakeup, &ceph_fsc_list);
spin_unlock(&ceph_fsc_lock);
return fsc;
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);
spin_lock(&ceph_fsc_lock);
list_del(&fsc->metric_wakeup);
spin_unlock(&ceph_fsc_lock);
ceph_mdsc_destroy(fsc);
destroy_workqueue(fsc->inode_wq);
destroy_workqueue(fsc->cap_wq);
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_snap_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;
mempool_t *ceph_wb_pagevec_pool;
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_snap_cachep = KMEM_CACHE(ceph_cap_snap, SLAB_MEM_SPREAD);
if (!ceph_cap_snap_cachep)
goto bad_cap_snap;
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;
ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10, CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT);
if (!ceph_wb_pagevec_pool)
goto bad_pagevec_pool;
return 0;
bad_pagevec_pool:
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_snap_cachep);
bad_cap_snap:
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_snap_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);
mempool_destroy(ceph_wb_pagevec_pool);
}
static void __ceph_umount_begin(struct ceph_fs_client *fsc)
{
ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
ceph_mdsc_force_umount(fsc->mdsc);
fsc->filp_gen++; // invalidate open files
}
/*
* ceph_umount_begin - initiate forced umount. Tear down the
* mount, skipping steps that may hang while waiting for server(s).
*/
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_umount_begin(fsc);
}
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 *fsc = ceph_sb_to_client(sb);
dout("ceph_compare_super %p\n", sb);
if (compare_mount_options(fsopt, opt, fsc)) {
dout("monitor(s)/mount options don't match\n");
return 0;
}
if ((opt->flags & CEPH_OPT_FSID) &&
ceph_fsid_compare(&opt->fsid, &fsc->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;
}
if (fsc->blocklisted && !ceph_test_mount_opt(fsc, CLEANRECOVER)) {
dout("client is blocklisted (and CLEANRECOVER is not set)\n");
return 0;
}
if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) {
dout("client has been forcibly unmounted\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 ceph_mount_options *fsopt = pctx->opts;
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");
if (fsopt->new_dev_syntax && !fsopt->mon_addr)
return invalfc(fc, "No monitor address");
/* 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);
if (strcmp_null(fsc->mount_options->mon_addr, fsopt->mon_addr)) {
kfree(fsc->mount_options->mon_addr);
fsc->mount_options->mon_addr = fsopt->mon_addr;
fsopt->mon_addr = NULL;
pr_notice("ceph: monitor addresses recorded, but not used for reconnection");
}
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);
dout("kill_sb %p\n", s);
ceph_mdsc_pre_umount(fsc->mdsc);
flush_fs_workqueues(fsc);
kill_anon_super(s);
fsc->client->extra_mon_dispatch = NULL;
ceph_fs_debugfs_cleanup(fsc);
ceph_fscache_unregister_fs(fsc);
destroy_fs_client(fsc);
}
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;
fsc->mount_state = CEPH_MOUNT_RECOVER;
__ceph_umount_begin(fsc);
/* Make sure all page caches get invalidated.
* see remove_session_caps_cb() */
flush_workqueue(fsc->inode_wq);
/* In case that we were blocklisted. This also reset
* all mon/osd connections */
ceph_reset_client_addr(fsc->client);
ceph_osdc_clear_abort_err(&fsc->client->osdc);
fsc->blocklisted = 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();
}
static int param_set_metrics(const char *val, const struct kernel_param *kp)
{
struct ceph_fs_client *fsc;
int ret;
ret = param_set_bool(val, kp);
if (ret) {
pr_err("Failed to parse sending metrics switch value '%s'\n",
val);
return ret;
} else if (!disable_send_metrics) {
// wake up all the mds clients
spin_lock(&ceph_fsc_lock);
list_for_each_entry(fsc, &ceph_fsc_list, metric_wakeup) {
metric_schedule_delayed(&fsc->mdsc->metric);
}
spin_unlock(&ceph_fsc_lock);
}
return 0;
}
static const struct kernel_param_ops param_ops_metrics = {
.set = param_set_metrics,
.get = param_get_bool,
};
bool disable_send_metrics = false;
module_param_cb(disable_send_metrics, &param_ops_metrics, &disable_send_metrics, 0644);
MODULE_PARM_DESC(disable_send_metrics, "Enable sending perf metrics to ceph cluster (default: on)");
/* for both v1 and v2 syntax */
static bool mount_support = true;
static const struct kernel_param_ops param_ops_mount_syntax = {
.get = param_get_bool,
};
module_param_cb(mount_syntax_v1, &param_ops_mount_syntax, &mount_support, 0444);
module_param_cb(mount_syntax_v2, &param_ops_mount_syntax, &mount_support, 0444);
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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