diff options
| author | Josef Bacik <josef@toxicpanda.com> | 2020-02-14 16:11:47 -0500 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-03-23 17:02:00 +0100 |
| commit | c75e839414d3610e6487ae3145199c500d55f7f7 (patch) | |
| tree | 68e609a6362c4f259afc2e107fffac94e743a126 /fs/btrfs/inode.c | |
| parent | efc3453494af78180ac00d9dd8391fd52c4a921e (diff) | |
btrfs: kill the subvol_srcu
Now that we have proper root ref counting everywhere we can kill the
subvol_srcu.
* removal of fs_info::subvol_srcu reduces size of fs_info by 1176 bytes
* the refcount_t used for the references checks for accidental 0->1
in cases where the root lifetime would not be properly protected
* there's a leak detector for roots to catch unfreed roots at umount
time
* SRCU served us well over the years but is was not a proper
synchronization mechanism for some cases
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 683bb20c1d0f..320d1062068d 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -5364,7 +5364,6 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) struct btrfs_root *sub_root = root; struct btrfs_key location; u8 di_type = 0; - int index; int ret = 0; if (dentry->d_name.len > BTRFS_NAME_LEN) @@ -5391,7 +5390,6 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) return inode; } - index = srcu_read_lock(&fs_info->subvol_srcu); ret = fixup_tree_root_location(fs_info, dir, dentry, &location, &sub_root); if (ret < 0) { @@ -5404,7 +5402,6 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) } if (root != sub_root) btrfs_put_root(sub_root); - srcu_read_unlock(&fs_info->subvol_srcu, index); if (!IS_ERR(inode) && root != sub_root) { down_read(&fs_info->cleanup_work_sem); |