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linux/fs/ceph/super.c

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#include "ceph_debug.h"
#include <linux/backing-dev.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 <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 = PATH_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_syncfs(struct super_block *sb, int wait)
{
dout("sync_fs %d\n", wait);
ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc);
ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc);
dout("sync_fs %d done\n", wait);
return 0;
}
/**
* 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, ",fsidmajor=%llu,fsidminor%llu",
le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]),
le64_to_cpu(*(__le64 *)&args->fsid.fsid[8]));
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 (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 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;
}
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_syncfs,
.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_fsidmajor,
Opt_fsidminor,
Opt_monport,
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_readdir_max_entries,
Opt_congestion_kb,
Opt_last_int,
/* int args above */
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_fsidmajor, "fsidmajor=%ld"},
{Opt_fsidminor, "fsidminor=%ld"},
{Opt_monport, "monport=%d"},
{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_readdir_max_entries, "readdir_max_entries=%d"},
{Opt_congestion_kb, "write_congestion_kb=%d"},
/* int args above */
{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 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_CAPS_PER_RELEASE * 4;
args->max_readdir = 1024;
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_fsidmajor:
*(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval);
break;
case Opt_fsidminor:
*(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval);
break;
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_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_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_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;
ceph_adjust_min_caps(client->min_caps);
/* 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_monc_stop(&client->monc);
ceph_osdc_stop(&client->osdc);
ceph_adjust_min_caps(-client->min_caps);
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 " FSID_FORMAT " got " FSID_FORMAT,
PR_FSID(&client->fsid), PR_FSID(fsid));
return -1;
}
} else {
pr_info("client%lld fsid " FSID_FORMAT "\n",
client->monc.auth->global_id, PR_FSID(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_PTR(PTR_ERR(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 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_dev(&client->backing_dev_info, sb->s_dev);
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);
up_write(&sb->s_umount);
deactivate_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;
ceph_caps_init();
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);
ceph_caps_finalize();
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");
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