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fs: new helper vfs_empty_path()

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Make it possible to quickly check whether AT_EMPTY_PATH is valid.
Note, after some discussion we decided to also allow NULL to be passed
instead of requiring the empty string.

Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2024-04-30 13:54:46 +02:00
parent 9fb9ff7ed1
commit 1bc6d4452d
1 changed files with 17 additions and 0 deletions
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17
include/linux/fs.h
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@@ -3631,4 +3631,21 @@ extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len,
extern int generic_fadvise(struct file *file, loff_t offset, loff_t len,
int advice);
static inline bool vfs_empty_path(int dfd, const char __user *path)
{
char c;
if (dfd < 0)
return false;
/* We now allow NULL to be used for empty path. */
if (!path)
return true;
if (unlikely(get_user(c, path)))
return false;
return !c;
}
#endif /* _LINUX_FS_H */