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fs/locks: F_UNLCK extension for F_OFD_GETLK 

Currently F_UNLCK with F_OFD_GETLK returns -EINVAL. This patch changes
it such that specifying F_UNLCK returns information only about OFD locks
that are owned by the given file description.

Cc: Jeff Layton <jlayton@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
Cc: linux-api@vger.kernel.org
Signed-off-by: Stas Sergeev <stsp2@yandex.ru>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
Stas Sergeev 2023-06-22 21:52:23 +05:00 committed by Jeff Layton
parent 1ef6663a58
commit 6c9007f65d
1 changed files with 20 additions and 3 deletions
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23
fs/locks.c
View File

@ -868,6 +868,21 @@ static bool posix_locks_conflict(struct file_lock *caller_fl,
return locks_conflict(caller_fl, sys_fl);
}
/* Determine if lock sys_fl blocks lock caller_fl. Used on xx_GETLK
* path so checks for additional GETLK-specific things like F_UNLCK.
*/
static bool posix_test_locks_conflict(struct file_lock *caller_fl,
struct file_lock *sys_fl)
{
/* F_UNLCK checks any locks on the same fd. */
if (caller_fl->fl_type == F_UNLCK) {
if (!posix_same_owner(caller_fl, sys_fl))
return false;
return locks_overlap(caller_fl, sys_fl);
}
return posix_locks_conflict(caller_fl, sys_fl);
}
/* Determine if lock sys_fl blocks lock caller_fl. FLOCK specific
* checking before calling the locks_conflict().
*/
@ -901,7 +916,7 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
retry:
spin_lock(&ctx->flc_lock);
list_for_each_entry(cfl, &ctx->flc_posix, fl_list) {
if (!posix_locks_conflict(fl, cfl))
if (!posix_test_locks_conflict(fl, cfl))
continue;
if (cfl->fl_lmops && cfl->fl_lmops->lm_lock_expirable
&& (*cfl->fl_lmops->lm_lock_expirable)(cfl)) {
@ -2207,7 +2222,8 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock *flock)
if (fl == NULL)
return -ENOMEM;
error = -EINVAL;
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
if (cmd != F_OFD_GETLK && flock->l_type != F_RDLCK
&& flock->l_type != F_WRLCK)
goto out;
error = flock_to_posix_lock(filp, fl, flock);
@ -2414,7 +2430,8 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 *flock)
return -ENOMEM;
error = -EINVAL;
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
if (cmd != F_OFD_GETLK && flock->l_type != F_RDLCK
&& flock->l_type != F_WRLCK)
goto out;
error = flock64_to_posix_lock(filp, fl, flock);