[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20230622165225.2772076-2-stsp2@yandex.ru>
Date: Thu, 22 Jun 2023 21:52:23 +0500
From: Stas Sergeev <stsp2@...dex.ru>
To: linux-kernel@...r.kernel.org
Cc: Stas Sergeev <stsp2@...dex.ru>, Jeff Layton <jlayton@...nel.org>,
Chuck Lever <chuck.lever@...cle.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
linux-fsdevel@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
linux-kselftest@...r.kernel.org, linux-api@...r.kernel.org
Subject: [PATCH 1/2] fs/locks: F_UNLCK extension for F_OFD_GETLK
Currently F_UNLCK with F_OFD_GETLK returns -EINVAL.
The proposed extension allows to use it for getting the lock
information from the particular fd.
Signed-off-by: Stas Sergeev <stsp2@...dex.ru>
CC: Jeff Layton <jlayton@...nel.org>
CC: Chuck Lever <chuck.lever@...cle.com>
CC: Alexander Viro <viro@...iv.linux.org.uk>
CC: Christian Brauner <brauner@...nel.org>
CC: linux-fsdevel@...r.kernel.org
CC: linux-kernel@...r.kernel.org
CC: Shuah Khan <shuah@...nel.org>
CC: linux-kselftest@...r.kernel.org
CC: linux-api@...r.kernel.org
---
fs/locks.c | 23 ++++++++++++++++++++---
1 file changed, 20 insertions(+), 3 deletions(-)
diff --git a/fs/locks.c b/fs/locks.c
index df8b26a42524..210766007e63 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -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);
--
2.39.2
Powered by blists - more mailing lists