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| author | Al Viro <viro@zeniv.linux.org.uk> | 2011-11-17 07:00:31 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-01-09 01:33:22 +0100 |
| commit | 98c7089c769048f941bd5c5285287f8fc301f8b1 (patch) | |
| tree | 3e31f46b43fb1b533dc720db7a9d84da3b148433 /fs | |
| parent | Merge tag 'infiniband-for-linus' of git://git.kernel.org/pub/scm/linux/kernel... (diff) | |
| download | linux-98c7089c769048f941bd5c5285287f8fc301f8b1.tar.xz linux-98c7089c769048f941bd5c5285287f8fc301f8b1.zip | |
btrfs: preparation to fixing mount/umount race
We need fs_info and root to live until the moment when the victim
superblock leaves the list, so we need to postpone free_fs_info()
until after ->put_super(). The call is buried in close_ctree(),
though, so we need to lift it into the callers (including
btrfs_put_super()) first.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/disk-io.c | 3 | ||||
| -rw-r--r-- | fs/btrfs/super.c | 6 |
2 files changed, 6 insertions, 3 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index f99a099a7747..dcb5d949b543 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2424,6 +2424,7 @@ retry_root_backup: up_read(&fs_info->cleanup_work_sem); if (err) { close_ctree(tree_root); + free_fs_info(fs_info); return ERR_PTR(err); } } @@ -3059,8 +3060,6 @@ int close_ctree(struct btrfs_root *root) bdi_destroy(&fs_info->bdi); cleanup_srcu_struct(&fs_info->subvol_srcu); - free_fs_info(fs_info); - return 0; } diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index ae488aa1966a..a3f435e58987 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -151,6 +151,7 @@ static void btrfs_put_super(struct super_block *sb) int ret; ret = close_ctree(root); + free_fs_info(root->fs_info); sb->s_fs_info = NULL; (void)ret; /* FIXME: need to fix VFS to return error? */ @@ -589,6 +590,7 @@ static int btrfs_fill_super(struct super_block *sb, struct inode *inode; struct dentry *root_dentry; struct btrfs_root *tree_root; + struct btrfs_fs_info *fs_info; struct btrfs_key key; int err; @@ -609,12 +611,13 @@ static int btrfs_fill_super(struct super_block *sb, printk("btrfs: open_ctree failed\n"); return PTR_ERR(tree_root); } + fs_info = tree_root->fs_info; sb->s_fs_info = tree_root; key.objectid = BTRFS_FIRST_FREE_OBJECTID; key.type = BTRFS_INODE_ITEM_KEY; key.offset = 0; - inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL); + inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); if (IS_ERR(inode)) { err = PTR_ERR(inode); goto fail_close; @@ -635,6 +638,7 @@ static int btrfs_fill_super(struct super_block *sb, fail_close: close_ctree(tree_root); + free_fs_info(fs_info); return err; } |