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authorAl Viro <viro@zeniv.linux.org.uk>2019-10-31 01:21:58 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2019-11-15 13:49:04 -0500
commit6c2d4798a8d16cf4f3a28c3cd4af4f1dcbbb4d04 (patch)
tree2b14c83985da30129911f7ad455e4cc587690e58 /fs/debugfs/inode.c
parentd41efb522e902364ab09c782d511c1bedc388ddd (diff)
new helper: lookup_positive_unlocked()
Most of the callers of lookup_one_len_unlocked() treat negatives are ERR_PTR(-ENOENT). Provide a helper that would do just that. Note that a pinned positive dentry remains positive - it's ->d_inode is stable, etc.; a pinned _negative_ dentry can become positive at any point as long as you are not holding its parent at least shared. So using lookup_one_len_unlocked() needs to be careful; lookup_positive_unlocked() is safer and that's what the callers end up open-coding anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/debugfs/inode.c')
-rw-r--r--fs/debugfs/inode.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 7b975dbb2bb4..f4d8df5e4714 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -299,13 +299,9 @@ struct dentry *debugfs_lookup(const char *name, struct dentry *parent)
if (!parent)
parent = debugfs_mount->mnt_root;
- dentry = lookup_one_len_unlocked(name, parent, strlen(name));
+ dentry = lookup_positive_unlocked(name, parent, strlen(name));
if (IS_ERR(dentry))
return NULL;
- if (!d_really_is_positive(dentry)) {
- dput(dentry);
- return NULL;
- }
return dentry;
}
EXPORT_SYMBOL_GPL(debugfs_lookup);