}
-struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs)
+struct inode *nilfs_alloc_inode(struct super_block *sb)
{
struct nilfs_inode_info *ii;
ii->i_state = 0;
ii->i_cno = 0;
ii->vfs_inode.i_version = 1;
- nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi);
+ nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi);
return &ii->vfs_inode;
}
-struct inode *nilfs_alloc_inode(struct super_block *sb)
-{
- return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs);
-}
-
void nilfs_destroy_inode(struct inode *inode)
{
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
nilfs_cleanup_super(sbi);
up_write(&nilfs->ns_sem);
}
- down_write(&nilfs->ns_super_sem);
- if (nilfs->ns_current == sbi)
- nilfs->ns_current = NULL;
- list_del_init(&sbi->s_list);
- up_write(&nilfs->ns_super_sem);
- put_nilfs(sbi->s_nilfs);
+ iput(nilfs->ns_sufile);
+ iput(nilfs->ns_cpfile);
+ iput(nilfs->ns_dat);
+
+ destroy_nilfs(nilfs);
sbi->s_super = NULL;
sb->s_fs_info = NULL;
- nilfs_put_sbinfo(sbi);
+ kfree(sbi);
}
static int nilfs_sync_fs(struct super_block *sb, int wait)
if (root->ifile)
goto reuse; /* already attached checkpoint */
- root->ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size);
- if (!root->ifile)
- goto failed;
-
down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
&bh_cp);
}
goto failed;
}
- err = nilfs_read_inode_common(root->ifile, &raw_cp->cp_ifile_inode);
- if (unlikely(err))
+
+ err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size,
+ &raw_cp->cp_ifile_inode, &root->ifile);
+ if (err)
goto failed_bh;
atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
{
struct super_block *sb = vfs->mnt_sb;
struct nilfs_sb_info *sbi = NILFS_SB(sb);
+ struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root;
if (!nilfs_test_opt(sbi, BARRIER))
seq_puts(seq, ",nobarrier");
- if (nilfs_test_opt(sbi, SNAPSHOT))
- seq_printf(seq, ",cp=%llu",
- (unsigned long long int)sbi->s_snapshot_cno);
+ if (root->cno != NILFS_CPTREE_CURRENT_CNO)
+ seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
if (nilfs_test_opt(sbi, ERRORS_PANIC))
seq_puts(seq, ",errors=panic");
if (nilfs_test_opt(sbi, ERRORS_CONT))
if (match_int(&args[0], &option) || option <= 0)
return 0;
if (is_remount) {
- if (!nilfs_test_opt(sbi, SNAPSHOT)) {
- printk(KERN_ERR
- "NILFS: cannot change regular "
- "mount to snapshot.\n");
- return 0;
- } else if (option != sbi->s_snapshot_cno) {
- printk(KERN_ERR
- "NILFS: cannot remount to a "
- "different snapshot.\n");
- return 0;
- }
- break;
- }
- if (!(sb->s_flags & MS_RDONLY)) {
- printk(KERN_ERR "NILFS: cannot mount snapshot "
- "read/write. A read-only option is "
- "required.\n");
+ printk(KERN_ERR
+ "NILFS: \"%s\" option is invalid "
+ "for remount.\n", p);
return 0;
}
- sbi->s_snapshot_cno = option;
- nilfs_set_opt(sbi, SNAPSHOT);
break;
case Opt_norecovery:
nilfs_set_opt(sbi, NORECOVERY);
goto out;
}
- dentry = d_alloc_root(inode);
- if (!dentry) {
- iput(inode);
- printk(KERN_ERR "NILFS: get root dentry failed\n");
- ret = -ENOMEM;
- goto out;
+ if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
+ dentry = d_find_alias(inode);
+ if (!dentry) {
+ dentry = d_alloc_root(inode);
+ if (!dentry) {
+ iput(inode);
+ ret = -ENOMEM;
+ goto failed_dentry;
+ }
+ } else {
+ iput(inode);
+ }
+ } else {
+ dentry = d_obtain_alias(inode);
+ if (IS_ERR(dentry)) {
+ ret = PTR_ERR(dentry);
+ goto failed_dentry;
+ }
}
*root_dentry = dentry;
out:
return ret;
+
+ failed_dentry:
+ printk(KERN_ERR "NILFS: get root dentry failed\n");
+ goto out;
}
static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
return ret;
}
+static int nilfs_tree_was_touched(struct dentry *root_dentry)
+{
+ return atomic_read(&root_dentry->d_count) > 1;
+}
+
+/**
+ * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint
+ * @root_dentry: root dentry of the tree to be shrunk
+ *
+ * This function returns true if the tree was in-use.
+ */
+static int nilfs_try_to_shrink_tree(struct dentry *root_dentry)
+{
+ if (have_submounts(root_dentry))
+ return true;
+ shrink_dcache_parent(root_dentry);
+ return nilfs_tree_was_touched(root_dentry);
+}
+
+int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
+{
+ struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
+ struct nilfs_root *root;
+ struct inode *inode;
+ struct dentry *dentry;
+ int ret;
+
+ if (cno < 0 || cno > nilfs->ns_cno)
+ return false;
+
+ if (cno >= nilfs_last_cno(nilfs))
+ return true; /* protect recent checkpoints */
+
+ ret = false;
+ root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno);
+ if (root) {
+ inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
+ if (inode) {
+ dentry = d_find_alias(inode);
+ if (dentry) {
+ if (nilfs_tree_was_touched(dentry))
+ ret = nilfs_try_to_shrink_tree(dentry);
+ dput(dentry);
+ }
+ iput(inode);
+ }
+ nilfs_put_root(root);
+ }
+ return ret;
+}
+
/**
* nilfs_fill_super() - initialize a super block instance
* @sb: super_block
* @data: mount options
* @silent: silent mode flag
- * @nilfs: the_nilfs struct
*
* This function is called exclusively by nilfs->ns_mount_mutex.
* So, the recovery process is protected from other simultaneous mounts.
*/
static int
-nilfs_fill_super(struct super_block *sb, void *data, int silent,
- struct the_nilfs *nilfs)
+nilfs_fill_super(struct super_block *sb, void *data, int silent)
{
+ struct the_nilfs *nilfs;
struct nilfs_sb_info *sbi;
struct nilfs_root *fsroot;
__u64 cno;
return -ENOMEM;
sb->s_fs_info = sbi;
+ sbi->s_super = sb;
- get_nilfs(nilfs);
+ nilfs = alloc_nilfs(sb->s_bdev);
+ if (!nilfs) {
+ err = -ENOMEM;
+ goto failed_sbi;
+ }
sbi->s_nilfs = nilfs;
- sbi->s_super = sb;
- atomic_set(&sbi->s_count, 1);
err = init_nilfs(nilfs, sbi, (char *)data);
if (err)
- goto failed_sbi;
+ goto failed_nilfs;
spin_lock_init(&sbi->s_inode_lock);
INIT_LIST_HEAD(&sbi->s_dirty_files);
- INIT_LIST_HEAD(&sbi->s_list);
/*
* Following initialization is overlapped because
err = load_nilfs(nilfs, sbi);
if (err)
- goto failed_sbi;
-
- if (nilfs_test_opt(sbi, SNAPSHOT)) {
- err = nilfs_attach_snapshot(sb, sbi->s_snapshot_cno,
- &sb->s_root);
- if (err)
- goto failed_sbi;
-
- goto add_to_supers;
- }
+ goto failed_nilfs;
cno = nilfs_last_cno(nilfs);
err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot);
if (err) {
- printk(KERN_ERR "NILFS: error loading a checkpoint"
- " (checkpoint number=%llu).\n", (unsigned long long)cno);
- goto failed_sbi;
+ printk(KERN_ERR "NILFS: error loading last checkpoint "
+ "(checkpoint number=%llu).\n", (unsigned long long)cno);
+ goto failed_unload;
}
if (!(sb->s_flags & MS_RDONLY)) {
up_write(&nilfs->ns_sem);
}
- add_to_supers:
- down_write(&nilfs->ns_super_sem);
- list_add(&sbi->s_list, &nilfs->ns_supers);
- if (!nilfs_test_opt(sbi, SNAPSHOT))
- nilfs->ns_current = sbi;
- up_write(&nilfs->ns_super_sem);
-
return 0;
failed_segctor:
failed_checkpoint:
nilfs_put_root(fsroot);
+ failed_unload:
+ iput(nilfs->ns_sufile);
+ iput(nilfs->ns_cpfile);
+ iput(nilfs->ns_dat);
+
+ failed_nilfs:
+ destroy_nilfs(nilfs);
+
failed_sbi:
- put_nilfs(nilfs);
sb->s_fs_info = NULL;
- nilfs_put_sbinfo(sbi);
+ kfree(sbi);
return err;
}
struct the_nilfs *nilfs = sbi->s_nilfs;
unsigned long old_sb_flags;
struct nilfs_mount_options old_opts;
- int was_snapshot, err;
+ int err;
- down_write(&nilfs->ns_super_sem);
old_sb_flags = sb->s_flags;
old_opts.mount_opt = sbi->s_mount_opt;
- old_opts.snapshot_cno = sbi->s_snapshot_cno;
- was_snapshot = nilfs_test_opt(sbi, SNAPSHOT);
if (!parse_options(data, sb, 1)) {
err = -EINVAL;
sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
err = -EINVAL;
- if (was_snapshot && !(*flags & MS_RDONLY)) {
- printk(KERN_ERR "NILFS (device %s): cannot remount snapshot "
- "read/write.\n", sb->s_id);
- goto restore_opts;
- }
if (!nilfs_valid_fs(nilfs)) {
printk(KERN_WARNING "NILFS (device %s): couldn't "
up_write(&nilfs->ns_sem);
}
out:
- up_write(&nilfs->ns_super_sem);
return 0;
restore_opts:
sb->s_flags = old_sb_flags;
sbi->s_mount_opt = old_opts.mount_opt;
- sbi->s_snapshot_cno = old_opts.snapshot_cno;
- up_write(&nilfs->ns_super_sem);
return err;
}
static int nilfs_set_bdev_super(struct super_block *s, void *data)
{
- struct nilfs_super_data *sd = data;
-
- s->s_bdev = sd->bdev;
+ s->s_bdev = data;
s->s_dev = s->s_bdev->bd_dev;
return 0;
}
static int nilfs_test_bdev_super(struct super_block *s, void *data)
{
- struct nilfs_super_data *sd = data;
-
- return sd->sbi && s->s_fs_info == (void *)sd->sbi;
+ return (void *)s->s_bdev == data;
}
static int
struct nilfs_super_data sd;
struct super_block *s;
fmode_t mode = FMODE_READ;
- struct the_nilfs *nilfs;
- int err, need_to_close = 1;
+ struct dentry *root_dentry;
+ int err, s_new = false;
if (!(flags & MS_RDONLY))
mode |= FMODE_WRITE;
if (IS_ERR(sd.bdev))
return PTR_ERR(sd.bdev);
- /*
- * To get mount instance using sget() vfs-routine, NILFS needs
- * much more information than normal filesystems to identify mount
- * instance. For snapshot mounts, not only a mount type (ro-mount
- * or rw-mount) but also a checkpoint number is required.
- */
sd.cno = 0;
sd.flags = flags;
if (nilfs_identify((char *)data, &sd)) {
goto failed;
}
- nilfs = find_or_create_nilfs(sd.bdev);
- if (!nilfs) {
- err = -ENOMEM;
- goto failed;
- }
-
- mutex_lock(&nilfs->ns_mount_mutex);
-
- if (!sd.cno) {
- /*
- * Check if an exclusive mount exists or not.
- * Snapshot mounts coexist with a current mount
- * (i.e. rw-mount or ro-mount), whereas rw-mount and
- * ro-mount are mutually exclusive.
- */
- down_read(&nilfs->ns_super_sem);
- if (nilfs->ns_current &&
- ((nilfs->ns_current->s_super->s_flags ^ flags)
- & MS_RDONLY)) {
- up_read(&nilfs->ns_super_sem);
- err = -EBUSY;
- goto failed_unlock;
- }
- up_read(&nilfs->ns_super_sem);
- }
-
- /*
- * Find existing nilfs_sb_info struct
- */
- sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno);
-
- /*
- * Get super block instance holding the nilfs_sb_info struct.
- * A new instance is allocated if no existing mount is present or
- * existing instance has been unmounted.
- */
- s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd);
- if (sd.sbi)
- nilfs_put_sbinfo(sd.sbi);
-
+ s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev);
if (IS_ERR(s)) {
err = PTR_ERR(s);
- goto failed_unlock;
+ goto failed;
}
if (!s->s_root) {
char b[BDEVNAME_SIZE];
+ s_new = true;
+
/* New superblock instance created */
s->s_flags = flags;
s->s_mode = mode;
strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
sb_set_blocksize(s, block_size(sd.bdev));
- err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0,
- nilfs);
+ err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
if (err)
- goto cancel_new;
+ goto failed_super;
s->s_flags |= MS_ACTIVE;
- need_to_close = 0;
+ } else if (!sd.cno) {
+ int busy = false;
+
+ if (nilfs_tree_was_touched(s->s_root)) {
+ busy = nilfs_try_to_shrink_tree(s->s_root);
+ if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
+ printk(KERN_ERR "NILFS: the device already "
+ "has a %s mount.\n",
+ (s->s_flags & MS_RDONLY) ?
+ "read-only" : "read/write");
+ err = -EBUSY;
+ goto failed_super;
+ }
+ }
+ if (!busy) {
+ /*
+ * Try remount to setup mount states if the current
+ * tree is not mounted and only snapshots use this sb.
+ */
+ err = nilfs_remount(s, &flags, data);
+ if (err)
+ goto failed_super;
+ }
}
- mutex_unlock(&nilfs->ns_mount_mutex);
- put_nilfs(nilfs);
- if (need_to_close)
+ if (sd.cno) {
+ err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
+ if (err)
+ goto failed_super;
+ } else {
+ root_dentry = dget(s->s_root);
+ }
+
+ if (!s_new)
close_bdev_exclusive(sd.bdev, mode);
- simple_set_mnt(mnt, s);
- return 0;
- failed_unlock:
- mutex_unlock(&nilfs->ns_mount_mutex);
- put_nilfs(nilfs);
- failed:
- close_bdev_exclusive(sd.bdev, mode);
- return err;
+ mnt->mnt_sb = s;
+ mnt->mnt_root = root_dentry;
+ return 0;
- cancel_new:
- /* Abandoning the newly allocated superblock */
- mutex_unlock(&nilfs->ns_mount_mutex);
- put_nilfs(nilfs);
+ failed_super:
deactivate_locked_super(s);
- /*
- * deactivate_locked_super() invokes close_bdev_exclusive().
- * We must finish all post-cleaning before this call;
- * put_nilfs() needs the block device.
- */
+
+ failed:
+ if (!s_new)
+ close_bdev_exclusive(sd.bdev, mode);
return err;
}
git.openpandora.org / pandora-kernel.git / blobdiff