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btrfs: preparation to fixing mount/umount race

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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>
This commit is contained in:
Al Viro
2011-11-17 01:00:31 -05:00
parent 48fa57ac2c
commit 98c7089c76
2 changed files with 6 additions and 3 deletions
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3
fs/btrfs/disk-io.c
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@@ -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;
}