linux/fs/ceph/super.c

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#include "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/parser.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/statfs.h>
#include <linux/string.h>
#include "decode.h"
#include "super.h"
#include "mon_client.h"
#include "auth.h"
/*
* Ceph superblock operations
*
* Handle the basics of mounting, unmounting.
*/
/*
* find filename portion of a path (/foo/bar/baz -> baz)
*/
const char *ceph_file_part(const char *s, int len)
{
const char *e = s + len;
while (e != s && *(e-1) != '/')
e--;
return e;
}
/*
* super ops
*/
static void ceph_put_super(struct super_block *s)
{
struct ceph_client *client = ceph_sb_to_client(s);
dout("put_super\n");
ceph_mdsc_close_sessions(&client->mdsc);
/*
* ensure we release the bdi before put_anon_super releases
* the device name.
*/
if (s->s_bdi == &client->backing_dev_info) {
bdi_unregister(&client->backing_dev_info);
s->s_bdi = NULL;
}
return;
}
static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct ceph_client *client = ceph_inode_to_client(dentry->d_inode);
struct ceph_monmap *monmap = client->monc.monmap;
struct ceph_statfs st;
u64 fsid;
int err;
dout("statfs\n");
err = ceph_monc_do_statfs(&client->monc, &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.
*/
buf->f_bsize = 1 << CEPH_BLOCK_SHIFT;
buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10);
buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >>
(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;
buf->f_frsize = PAGE_CACHE_SIZE;
/* leave fsid little-endian, regardless of host endianness */
fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1);
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_client *client = ceph_sb_to_client(sb);
if (!wait) {
dout("sync_fs (non-blocking)\n");
ceph_flush_dirty_caps(&client->mdsc);
dout("sync_fs (non-blocking) done\n");
return 0;
}
dout("sync_fs (blocking)\n");
ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc);
ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc);
dout("sync_fs (blocking) done\n");
return 0;
}
static int default_congestion_kb(void)
{
int congestion_kb;
/*
* Copied from NFS
*
* congestion size, scale with available memory.
*
* 64MB: 8192k
* 128MB: 11585k
* 256MB: 16384k
* 512MB: 23170k
* 1GB: 32768k
* 2GB: 46340k
* 4GB: 65536k
* 8GB: 92681k
* 16GB: 131072k
*
* This allows larger machines to have larger/more transfers.
* Limit the default to 256M
*/
congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
if (congestion_kb > 256*1024)
congestion_kb = 256*1024;
return congestion_kb;
}
/**
* ceph_show_options - Show mount options in /proc/mounts
* @m: seq_file to write to
* @mnt: mount descriptor
*/
static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt)
{
struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb);
struct ceph_mount_args *args = client->mount_args;
if (args->flags & CEPH_OPT_FSID)
seq_printf(m, ",fsid=%pU", &args->fsid);
if (args->flags & CEPH_OPT_NOSHARE)
seq_puts(m, ",noshare");
if (args->flags & CEPH_OPT_DIRSTAT)
seq_puts(m, ",dirstat");
if ((args->flags & CEPH_OPT_RBYTES) == 0)
seq_puts(m, ",norbytes");
if (args->flags & CEPH_OPT_NOCRC)
seq_puts(m, ",nocrc");
if (args->flags & CEPH_OPT_NOASYNCREADDIR)
seq_puts(m, ",noasyncreaddir");
if (args->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
seq_printf(m, ",mount_timeout=%d", args->mount_timeout);
if (args->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
seq_printf(m, ",osd_idle_ttl=%d", args->osd_idle_ttl);
if (args->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT)
seq_printf(m, ",osdtimeout=%d", args->osd_timeout);
if (args->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
seq_printf(m, ",osdkeepalivetimeout=%d",
args->osd_keepalive_timeout);
if (args->wsize)
seq_printf(m, ",wsize=%d", args->wsize);
if (args->rsize != CEPH_MOUNT_RSIZE_DEFAULT)
seq_printf(m, ",rsize=%d", args->rsize);
if (args->congestion_kb != default_congestion_kb())
seq_printf(m, ",write_congestion_kb=%d", args->congestion_kb);
if (args->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
seq_printf(m, ",caps_wanted_delay_min=%d",
args->caps_wanted_delay_min);
if (args->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT)
seq_printf(m, ",caps_wanted_delay_max=%d",
args->caps_wanted_delay_max);
if (args->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT)
seq_printf(m, ",cap_release_safety=%d",
args->cap_release_safety);
if (args->max_readdir != CEPH_MAX_READDIR_DEFAULT)
seq_printf(m, ",readdir_max_entries=%d", args->max_readdir);
if (args->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT)
seq_printf(m, ",readdir_max_bytes=%d", args->max_readdir_bytes);
if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT))
seq_printf(m, ",snapdirname=%s", args->snapdir_name);
if (args->name)
seq_printf(m, ",name=%s", args->name);
if (args->secret)
seq_puts(m, ",secret=<hidden>");
return 0;
}
/*
* caches
*/
struct kmem_cache *ceph_inode_cachep;
struct kmem_cache *ceph_cap_cachep;
struct kmem_cache *ceph_dentry_cachep;
struct kmem_cache *ceph_file_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)
{
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),
ceph_inode_init_once);
if (ceph_inode_cachep == NULL)
return -ENOMEM;
ceph_cap_cachep = KMEM_CACHE(ceph_cap,
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
if (ceph_cap_cachep == NULL)
goto bad_cap;
ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
if (ceph_dentry_cachep == NULL)
goto bad_dentry;
ceph_file_cachep = KMEM_CACHE(ceph_file_info,
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
if (ceph_file_cachep == NULL)
goto bad_file;
return 0;
bad_file:
kmem_cache_destroy(ceph_dentry_cachep);
bad_dentry:
kmem_cache_destroy(ceph_cap_cachep);
bad_cap:
kmem_cache_destroy(ceph_inode_cachep);
return -ENOMEM;
}
static void destroy_caches(void)
{
kmem_cache_destroy(ceph_inode_cachep);
kmem_cache_destroy(ceph_cap_cachep);
kmem_cache_destroy(ceph_dentry_cachep);
kmem_cache_destroy(ceph_file_cachep);
}
/*
* 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_client *client = ceph_sb_to_client(sb);
dout("ceph_umount_begin - starting forced umount\n");
if (!client)
return;
client->mount_state = CEPH_MOUNT_SHUTDOWN;
return;
}
static const struct super_operations ceph_super_ops = {
.alloc_inode = ceph_alloc_inode,
.destroy_inode = ceph_destroy_inode,
.write_inode = ceph_write_inode,
.sync_fs = ceph_sync_fs,
.put_super = ceph_put_super,
.show_options = ceph_show_options,
.statfs = ceph_statfs,
.umount_begin = ceph_umount_begin,
};
const char *ceph_msg_type_name(int type)
{
switch (type) {
case CEPH_MSG_SHUTDOWN: return "shutdown";
case CEPH_MSG_PING: return "ping";
case CEPH_MSG_AUTH: return "auth";
case CEPH_MSG_AUTH_REPLY: return "auth_reply";
case CEPH_MSG_MON_MAP: return "mon_map";
case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
case CEPH_MSG_STATFS: return "statfs";
case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
case CEPH_MSG_MDS_MAP: return "mds_map";
case CEPH_MSG_CLIENT_SESSION: return "client_session";
case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
case CEPH_MSG_CLIENT_REQUEST: return "client_request";
case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
case CEPH_MSG_CLIENT_REPLY: return "client_reply";
case CEPH_MSG_CLIENT_CAPS: return "client_caps";
case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
case CEPH_MSG_CLIENT_SNAP: return "client_snap";
case CEPH_MSG_CLIENT_LEASE: return "client_lease";
case CEPH_MSG_OSD_MAP: return "osd_map";
case CEPH_MSG_OSD_OP: return "osd_op";
case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
default: return "unknown";
}
}
/*
* mount options
*/
enum {
Opt_wsize,
Opt_rsize,
Opt_osdtimeout,
Opt_osdkeepalivetimeout,
Opt_mount_timeout,
Opt_osd_idle_ttl,
Opt_caps_wanted_delay_min,
Opt_caps_wanted_delay_max,
Opt_cap_release_safety,
Opt_readdir_max_entries,
Opt_readdir_max_bytes,
Opt_congestion_kb,
Opt_last_int,
/* int args above */
Opt_fsid,
Opt_snapdirname,
Opt_name,
Opt_secret,
Opt_last_string,
/* string args above */
Opt_ip,
Opt_noshare,
Opt_dirstat,
Opt_nodirstat,
Opt_rbytes,
Opt_norbytes,
Opt_nocrc,
Opt_noasyncreaddir,
};
static match_table_t arg_tokens = {
{Opt_wsize, "wsize=%d"},
{Opt_rsize, "rsize=%d"},
{Opt_osdtimeout, "osdtimeout=%d"},
{Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
{Opt_mount_timeout, "mount_timeout=%d"},
{Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
{Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
{Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
{Opt_cap_release_safety, "cap_release_safety=%d"},
{Opt_readdir_max_entries, "readdir_max_entries=%d"},
{Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
{Opt_congestion_kb, "write_congestion_kb=%d"},
/* int args above */
{Opt_fsid, "fsid=%s"},
{Opt_snapdirname, "snapdirname=%s"},
{Opt_name, "name=%s"},
{Opt_secret, "secret=%s"},
/* string args above */
{Opt_ip, "ip=%s"},
{Opt_noshare, "noshare"},
{Opt_dirstat, "dirstat"},
{Opt_nodirstat, "nodirstat"},
{Opt_rbytes, "rbytes"},
{Opt_norbytes, "norbytes"},
{Opt_nocrc, "nocrc"},
{Opt_noasyncreaddir, "noasyncreaddir"},
{-1, NULL}
};
static int parse_fsid(const char *str, struct ceph_fsid *fsid)
{
int i = 0;
char tmp[3];
int err = -EINVAL;
int d;
dout("parse_fsid '%s'\n", str);
tmp[2] = 0;
while (*str && i < 16) {
if (ispunct(*str)) {
str++;
continue;
}
if (!isxdigit(str[0]) || !isxdigit(str[1]))
break;
tmp[0] = str[0];
tmp[1] = str[1];
if (sscanf(tmp, "%x", &d) < 1)
break;
fsid->fsid[i] = d & 0xff;
i++;
str += 2;
}
if (i == 16)
err = 0;
dout("parse_fsid ret %d got fsid %pU", err, fsid);
return err;
}
static struct ceph_mount_args *parse_mount_args(int flags, char *options,
const char *dev_name,
const char **path)
{
struct ceph_mount_args *args;
const char *c;
int err = -ENOMEM;
substring_t argstr[MAX_OPT_ARGS];
args = kzalloc(sizeof(*args), GFP_KERNEL);
if (!args)
return ERR_PTR(-ENOMEM);
args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr),
GFP_KERNEL);
if (!args->mon_addr)
goto out;
dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name);
/* start with defaults */
args->sb_flags = flags;
args->flags = CEPH_OPT_DEFAULT;
args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */
args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
args->rsize = CEPH_MOUNT_RSIZE_DEFAULT;
args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
args->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
args->max_readdir = CEPH_MAX_READDIR_DEFAULT;
args->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
args->congestion_kb = default_congestion_kb();
/* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */
err = -EINVAL;
if (!dev_name)
goto out;
*path = strstr(dev_name, ":/");
if (*path == NULL) {
pr_err("device name is missing path (no :/ in %s)\n",
dev_name);
goto out;
}
/* get mon ip(s) */
err = ceph_parse_ips(dev_name, *path, args->mon_addr,
CEPH_MAX_MON, &args->num_mon);
if (err < 0)
goto out;
/* path on server */
*path += 2;
dout("server path '%s'\n", *path);
/* parse mount options */
while ((c = strsep(&options, ",")) != NULL) {
int token, intval, ret;
if (!*c)
continue;
err = -EINVAL;
token = match_token((char *)c, arg_tokens, argstr);
if (token < 0) {
pr_err("bad mount option at '%s'\n", c);
goto out;
}
if (token < Opt_last_int) {
ret = match_int(&argstr[0], &intval);
if (ret < 0) {
pr_err("bad mount option arg (not int) "
"at '%s'\n", c);
continue;
}
dout("got int token %d val %d\n", token, intval);
} else if (token > Opt_last_int && token < Opt_last_string) {
dout("got string token %d val %s\n", token,
argstr[0].from);
} else {
dout("got token %d\n", token);
}
switch (token) {
case Opt_ip:
err = ceph_parse_ips(argstr[0].from,
argstr[0].to,
&args->my_addr,
1, NULL);
if (err < 0)
goto out;
args->flags |= CEPH_OPT_MYIP;
break;
case Opt_fsid:
err = parse_fsid(argstr[0].from, &args->fsid);
if (err == 0)
args->flags |= CEPH_OPT_FSID;
break;
case Opt_snapdirname:
kfree(args->snapdir_name);
args->snapdir_name = kstrndup(argstr[0].from,
argstr[0].to-argstr[0].from,
GFP_KERNEL);
break;
case Opt_name:
args->name = kstrndup(argstr[0].from,
argstr[0].to-argstr[0].from,
GFP_KERNEL);
break;
case Opt_secret:
args->secret = kstrndup(argstr[0].from,
argstr[0].to-argstr[0].from,
GFP_KERNEL);
break;
/* misc */
case Opt_wsize:
args->wsize = intval;
break;
case Opt_rsize:
args->rsize = intval;
break;
case Opt_osdtimeout:
args->osd_timeout = intval;
break;
case Opt_osdkeepalivetimeout:
args->osd_keepalive_timeout = intval;
break;
case Opt_osd_idle_ttl:
args->osd_idle_ttl = intval;
break;
case Opt_mount_timeout:
args->mount_timeout = intval;
break;
case Opt_caps_wanted_delay_min:
args->caps_wanted_delay_min = intval;
break;
case Opt_caps_wanted_delay_max:
args->caps_wanted_delay_max = intval;
break;
case Opt_readdir_max_entries:
args->max_readdir = intval;
break;
case Opt_readdir_max_bytes:
args->max_readdir_bytes = intval;
break;
case Opt_congestion_kb:
args->congestion_kb = intval;
break;
case Opt_noshare:
args->flags |= CEPH_OPT_NOSHARE;
break;
case Opt_dirstat:
args->flags |= CEPH_OPT_DIRSTAT;
break;
case Opt_nodirstat:
args->flags &= ~CEPH_OPT_DIRSTAT;
break;
case Opt_rbytes:
args->flags |= CEPH_OPT_RBYTES;
break;
case Opt_norbytes:
args->flags &= ~CEPH_OPT_RBYTES;
break;
case Opt_nocrc:
args->flags |= CEPH_OPT_NOCRC;
break;
case Opt_noasyncreaddir:
args->flags |= CEPH_OPT_NOASYNCREADDIR;
break;
default:
BUG_ON(token);
}
}
return args;
out:
kfree(args->mon_addr);
kfree(args);
return ERR_PTR(err);
}
static void destroy_mount_args(struct ceph_mount_args *args)
{
dout("destroy_mount_args %p\n", args);
kfree(args->snapdir_name);
args->snapdir_name = NULL;
kfree(args->name);
args->name = NULL;
kfree(args->secret);
args->secret = NULL;
kfree(args);
}
/*
* create a fresh client instance
*/
static struct ceph_client *ceph_create_client(struct ceph_mount_args *args)
{
struct ceph_client *client;
int err = -ENOMEM;
client = kzalloc(sizeof(*client), GFP_KERNEL);
if (client == NULL)
return ERR_PTR(-ENOMEM);
mutex_init(&client->mount_mutex);
init_waitqueue_head(&client->auth_wq);
client->sb = NULL;
client->mount_state = CEPH_MOUNT_MOUNTING;
client->mount_args = args;
client->msgr = NULL;
client->auth_err = 0;
atomic_long_set(&client->writeback_count, 0);
err = bdi_init(&client->backing_dev_info);
if (err < 0)
goto fail;
err = -ENOMEM;
client->wb_wq = create_workqueue("ceph-writeback");
if (client->wb_wq == NULL)
goto fail_bdi;
client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
if (client->pg_inv_wq == NULL)
goto fail_wb_wq;
client->trunc_wq = create_singlethread_workqueue("ceph-trunc");
if (client->trunc_wq == NULL)
goto fail_pg_inv_wq;
/* set up mempools */
err = -ENOMEM;
client->wb_pagevec_pool = mempool_create_kmalloc_pool(10,
client->mount_args->wsize >> PAGE_CACHE_SHIFT);
if (!client->wb_pagevec_pool)
goto fail_trunc_wq;
/* caps */
client->min_caps = args->max_readdir;
/* subsystems */
err = ceph_monc_init(&client->monc, client);
if (err < 0)
goto fail_mempool;
err = ceph_osdc_init(&client->osdc, client);
if (err < 0)
goto fail_monc;
err = ceph_mdsc_init(&client->mdsc, client);
if (err < 0)
goto fail_osdc;
return client;
fail_osdc:
ceph_osdc_stop(&client->osdc);
fail_monc:
ceph_monc_stop(&client->monc);
fail_mempool:
mempool_destroy(client->wb_pagevec_pool);
fail_trunc_wq:
destroy_workqueue(client->trunc_wq);
fail_pg_inv_wq:
destroy_workqueue(client->pg_inv_wq);
fail_wb_wq:
destroy_workqueue(client->wb_wq);
fail_bdi:
bdi_destroy(&client->backing_dev_info);
fail:
kfree(client);
return ERR_PTR(err);
}
static void ceph_destroy_client(struct ceph_client *client)
{
dout("destroy_client %p\n", client);
/* unmount */
ceph_mdsc_stop(&client->mdsc);
ceph_osdc_stop(&client->osdc);
/*
* make sure mds and osd connections close out before destroying
* the auth module, which is needed to free those connections'
* ceph_authorizers.
*/
ceph_msgr_flush();
ceph_monc_stop(&client->monc);
ceph_debugfs_client_cleanup(client);
destroy_workqueue(client->wb_wq);
destroy_workqueue(client->pg_inv_wq);
destroy_workqueue(client->trunc_wq);
bdi_destroy(&client->backing_dev_info);
if (client->msgr)
ceph_messenger_destroy(client->msgr);
mempool_destroy(client->wb_pagevec_pool);
destroy_mount_args(client->mount_args);
kfree(client);
dout("destroy_client %p done\n", client);
}
/*
* Initially learn our fsid, or verify an fsid matches.
*/
int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
{
if (client->have_fsid) {
if (ceph_fsid_compare(&client->fsid, fsid)) {
pr_err("bad fsid, had %pU got %pU",
&client->fsid, fsid);
return -1;
}
} else {
pr_info("client%lld fsid %pU\n", client->monc.auth->global_id,
fsid);
memcpy(&client->fsid, fsid, sizeof(*fsid));
ceph_debugfs_client_init(client);
client->have_fsid = true;
}
return 0;
}
/*
* true if we have the mon map (and have thus joined the cluster)
*/
static int have_mon_and_osd_map(struct ceph_client *client)
{
return client->monc.monmap && client->monc.monmap->epoch &&
client->osdc.osdmap && client->osdc.osdmap->epoch;
}
/*
* 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_client *client,
const char *path,
unsigned long started)
{
struct ceph_mds_client *mdsc = &client->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);
req->r_ino1.ino = CEPH_INO_ROOT;
req->r_ino1.snap = CEPH_NOSNAP;
req->r_started = started;
req->r_timeout = client->mount_args->mount_timeout * HZ;
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) {
dout("open_root_inode success\n");
if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT &&
client->sb->s_root == NULL)
root = d_alloc_root(req->r_target_inode);
else
root = d_obtain_alias(req->r_target_inode);
req->r_target_inode = NULL;
dout("open_root_inode success, root dentry is %p\n", root);
} else {
root = ERR_PTR(err);
}
ceph_mdsc_put_request(req);
return root;
}
/*
* mount: join the ceph cluster, and open root directory.
*/
static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt,
const char *path)
{
struct ceph_entity_addr *myaddr = NULL;
int err;
unsigned long timeout = client->mount_args->mount_timeout * HZ;
unsigned long started = jiffies; /* note the start time */
struct dentry *root;
dout("mount start\n");
mutex_lock(&client->mount_mutex);
/* initialize the messenger */
if (client->msgr == NULL) {
if (ceph_test_opt(client, MYIP))
myaddr = &client->mount_args->my_addr;
client->msgr = ceph_messenger_create(myaddr);
if (IS_ERR(client->msgr)) {
err = PTR_ERR(client->msgr);
client->msgr = NULL;
goto out;
}
client->msgr->nocrc = ceph_test_opt(client, NOCRC);
}
/* open session, and wait for mon, mds, and osd maps */
err = ceph_monc_open_session(&client->monc);
if (err < 0)
goto out;
while (!have_mon_and_osd_map(client)) {
err = -EIO;
if (timeout && time_after_eq(jiffies, started + timeout))
goto out;
/* wait */
dout("mount waiting for mon_map\n");
err = wait_event_interruptible_timeout(client->auth_wq,
have_mon_and_osd_map(client) || (client->auth_err < 0),
timeout);
if (err == -EINTR || err == -ERESTARTSYS)
goto out;
if (client->auth_err < 0) {
err = client->auth_err;
goto out;
}
}
dout("mount opening root\n");
root = open_root_dentry(client, "", started);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
}
if (client->sb->s_root)
dput(root);
else
client->sb->s_root = root;
if (path[0] == 0) {
dget(root);
} else {
dout("mount opening base mountpoint\n");
root = open_root_dentry(client, path, started);
if (IS_ERR(root)) {
err = PTR_ERR(root);
dput(client->sb->s_root);
client->sb->s_root = NULL;
goto out;
}
}
mnt->mnt_root = root;
mnt->mnt_sb = client->sb;
client->mount_state = CEPH_MOUNT_MOUNTED;
dout("mount success\n");
err = 0;
out:
mutex_unlock(&client->mount_mutex);
return err;
}
static int ceph_set_super(struct super_block *s, void *data)
{
struct ceph_client *client = data;
int ret;
dout("set_super %p data %p\n", s, data);
s->s_flags = client->mount_args->sb_flags;
s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
s->s_fs_info = client;
client->sb = s;
s->s_op = &ceph_super_ops;
s->s_export_op = &ceph_export_ops;
s->s_time_gran = 1000; /* 1000 ns == 1 us */
ret = set_anon_super(s, NULL); /* what is that second arg for? */
if (ret != 0)
goto fail;
return ret;
fail:
s->s_fs_info = NULL;
client->sb = NULL;
return ret;
}
/*
* share superblock if same fs AND options
*/
static int ceph_compare_super(struct super_block *sb, void *data)
{
struct ceph_client *new = data;
struct ceph_mount_args *args = new->mount_args;
struct ceph_client *other = ceph_sb_to_client(sb);
int i;
dout("ceph_compare_super %p\n", sb);
if (args->flags & CEPH_OPT_FSID) {
if (ceph_fsid_compare(&args->fsid, &other->fsid)) {
dout("fsid doesn't match\n");
return 0;
}
} else {
/* do we share (a) monitor? */
for (i = 0; i < new->monc.monmap->num_mon; i++)
if (ceph_monmap_contains(other->monc.monmap,
&new->monc.monmap->mon_inst[i].addr))
break;
if (i == new->monc.monmap->num_mon) {
dout("mon ip not part of monmap\n");
return 0;
}
dout("mon ip matches existing sb %p\n", sb);
}
if (args->sb_flags != other->mount_args->sb_flags) {
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_register_bdi(struct super_block *sb, struct ceph_client *client)
{
int err;
/* set ra_pages based on rsize mount option? */
if (client->mount_args->rsize >= PAGE_CACHE_SIZE)
client->backing_dev_info.ra_pages =
(client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
>> PAGE_SHIFT;
err = bdi_register(&client->backing_dev_info, NULL, "ceph-%d",
atomic_long_inc_return(&bdi_seq));
if (!err)
sb->s_bdi = &client->backing_dev_info;
return err;
}
static int ceph_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data,
struct vfsmount *mnt)
{
struct super_block *sb;
struct ceph_client *client;
int err;
int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
const char *path = NULL;
struct ceph_mount_args *args;
dout("ceph_get_sb\n");
args = parse_mount_args(flags, data, dev_name, &path);
if (IS_ERR(args)) {
err = PTR_ERR(args);
goto out_final;
}
/* create client (which we may/may not use) */
client = ceph_create_client(args);
if (IS_ERR(client)) {
err = PTR_ERR(client);
goto out_final;
}
if (client->mount_args->flags & CEPH_OPT_NOSHARE)
compare_super = NULL;
sb = sget(fs_type, compare_super, ceph_set_super, client);
if (IS_ERR(sb)) {
err = PTR_ERR(sb);
goto out;
}
if (ceph_sb_to_client(sb) != client) {
ceph_destroy_client(client);
client = ceph_sb_to_client(sb);
dout("get_sb got existing client %p\n", client);
} else {
dout("get_sb using new client %p\n", client);
err = ceph_register_bdi(sb, client);
if (err < 0)
goto out_splat;
}
err = ceph_mount(client, mnt, path);
if (err < 0)
goto out_splat;
dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root,
mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode));
return 0;
out_splat:
ceph_mdsc_close_sessions(&client->mdsc);
deactivate_locked_super(sb);
goto out_final;
out:
ceph_destroy_client(client);
out_final:
dout("ceph_get_sb fail %d\n", err);
return err;
}
static void ceph_kill_sb(struct super_block *s)
{
struct ceph_client *client = ceph_sb_to_client(s);
dout("kill_sb %p\n", s);
ceph_mdsc_pre_umount(&client->mdsc);
kill_anon_super(s); /* will call put_super after sb is r/o */
ceph_destroy_client(client);
}
static struct file_system_type ceph_fs_type = {
.owner = THIS_MODULE,
.name = "ceph",
.get_sb = ceph_get_sb,
.kill_sb = ceph_kill_sb,
.fs_flags = FS_RENAME_DOES_D_MOVE,
};
#define _STRINGIFY(x) #x
#define STRINGIFY(x) _STRINGIFY(x)
static int __init init_ceph(void)
{
int ret = 0;
ret = ceph_debugfs_init();
if (ret < 0)
goto out;
ret = ceph_msgr_init();
if (ret < 0)
goto out_debugfs;
ret = init_caches();
if (ret)
goto out_msgr;
ret = register_filesystem(&ceph_fs_type);
if (ret)
goto out_icache;
pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n",
CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL,
CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
return 0;
out_icache:
destroy_caches();
out_msgr:
ceph_msgr_exit();
out_debugfs:
ceph_debugfs_cleanup();
out:
return ret;
}
static void __exit exit_ceph(void)
{
dout("exit_ceph\n");
unregister_filesystem(&ceph_fs_type);
destroy_caches();
ceph_msgr_exit();
ceph_debugfs_cleanup();
}
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");