From patchwork Wed Jan 31 23:02:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 13540186 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 38CDD13F00E; Wed, 31 Jan 2024 23:03:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706742236; cv=none; b=jPemhmc2nrPzK8FRY4DWHBXhgC+5lhcrM8CluIhElvamaGnYjO8rJE54qgXS/n4U43m4FD2V9gOcdfR1JeSoVNFGlVizxcWgMOTiRLnZlSdKYhwg/f48ue/PFxj2pJOT/gR5pHGFmgBn+3zyCbwQ5DKEeQuepTco9wo0Yy5rAI8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706742236; c=relaxed/simple; bh=0YFUDJ7msiDJew/mNCnxfjta1yyk32KWVjgnCpcvpMM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=TVJqXBAV/Th61j82L1C76iiBEYsAamIIduPZmT5YKHTWdiJlKfzOrk53vmePLKLkdI04yigEEVqEo07dJGNQ4FIrMW8RBXFIPwvCuh0+FZmPinirjk/az/B4MCIoehBx5kGDXpYNKDVcrs1nxH38A4ZmowXWHDrTduPQTkDfuOo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=j+ffT/qR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="j+ffT/qR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4683C43142; Wed, 31 Jan 2024 23:03:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706742235; bh=0YFUDJ7msiDJew/mNCnxfjta1yyk32KWVjgnCpcvpMM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=j+ffT/qRGIsGgz7Jqzd9hFBoN1Tn9RQ6JDVbg1U693+Fpptc9ZaE/Y6oXUkrA8MTT /9mpWYv7m+K91RPgB2aiiJ3GBvl8yEswcC+FD1XKvPHiU04qAIDVQuiScXO2gClieA lHO5gMgCDRwiUprffe8iT7bacedFSv+P0+rUEVeQMhENNRCP0uY37XKEQb/1feL0PS O8tYH6sGuBpNgDVy2lSCzeMfZ+Tlpj3UCTltualRUvEdhaeRiN8/X2g/fvC+J/0UUB u9UG16Oeh4Xvrq5vI39WturtSbYil6d4AgZZFt5H7G4pV7T3abdqdJTD/J7NsqM2mY c7iC6Nbod/trQ== From: Jeff Layton Date: Wed, 31 Jan 2024 18:02:06 -0500 Subject: [PATCH v3 25/47] filelock: convert __locks_insert_block, conflict and deadlock checks to use file_lock_core Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240131-flsplit-v3-25-c6129007ee8d@kernel.org> References: <20240131-flsplit-v3-0-c6129007ee8d@kernel.org> In-Reply-To: <20240131-flsplit-v3-0-c6129007ee8d@kernel.org> To: Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Chuck Lever , Alexander Viro , Christian Brauner , Jan Kara , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , David Howells , Marc Dionne , Xiubo Li , Ilya Dryomov , Alexander Aring , David Teigland , Andreas Gruenbacher , Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Trond Myklebust , Anna Schumaker , Mark Fasheh , Joel Becker , Joseph Qi , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Namjae Jeon , Sergey Senozhatsky , Miklos Szeredi Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, v9fs@lists.linux.dev, linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org, gfs2@lists.linux.dev, linux-nfs@vger.kernel.org, ocfs2-devel@lists.linux.dev, linux-cifs@vger.kernel.org, Jeff Layton X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=10618; i=jlayton@kernel.org; h=from:subject:message-id; bh=0YFUDJ7msiDJew/mNCnxfjta1yyk32KWVjgnCpcvpMM=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBlutFx/6/Tc/SoK4BCxBcA+1wRfGg6cmkImyPId q4q443BjQyJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCZbrRcQAKCRAADmhBGVaC FfLYEADJShn/debHumZsaq9gcK/vGBoD6YKcC8ybLKrX4xjExxzTZOsKQCkRCzA0/+fBR9jD20w V7UYkaXu76rQWlsAUZowZ3GZNjeQO6o8hCrnJcEkWJlpw0jbQmQ/xGfbaSTc23trRjbbz2xUr5v xB++JmkmFK7GD4iajv084u6isNK076nWeBJvlJItLKljMvw2nxLY26SNuaRVsUUhFGydc8cwx0m FIoJ9SP0lRNCtWQV+kaTHg7ePur3I8UN+2UWtGgYcxX+sRBoJ8+lUfqKLccS0Q8VI8lIEKan+vt +X+++I+UsHHBqjjHvSBc6A/+YCwNqd3KCq/7F+0p6jAjdsks1E2y3eV0MMq5ajhluCzO0RlCyaq 9ASjGcX7UgPJ/l+PwvoQudA9ZVP/KP6C60UVvuvn7I5HYCwX/+9WZQGsMCU24NGtMJ+CJylgNIm RaiJC+ViGl1AMs6KHea0yVYs6s9pOFnnXr3VIxKRPhWKC7K7Cix4HgaTpngEzGW9ioKDJyH09+C FMh0A851xx6zE6GGAfBR59u7yEB92OJtm3Jryuawys2ZUxgfazZw0kxGUVKLin+Z6Zy/HRY++97 Qfy08JFMvZ28zH/IRUuH/pImXXT16B/Yoqb3DX2dH/71f0uID1bYAYDpdc07QgEukMGbO81rWjQ 4MFpN4V6wZQMnAQ== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 Have both __locks_insert_block and the deadlock and conflict checking functions take a struct file_lock_core pointer instead of a struct file_lock one. Also, change posix_locks_deadlock to return bool. Signed-off-by: Jeff Layton --- fs/locks.c | 132 +++++++++++++++++++++++++++++++++---------------------------- 1 file changed, 72 insertions(+), 60 deletions(-) diff --git a/fs/locks.c b/fs/locks.c index 1e8b943bd7f9..0dc1c9da858c 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -757,39 +757,41 @@ EXPORT_SYMBOL(locks_delete_block); * waiters, and add beneath any waiter that blocks the new waiter. * Thus wakeups don't happen until needed. */ -static void __locks_insert_block(struct file_lock *blocker, - struct file_lock *waiter, - bool conflict(struct file_lock *, - struct file_lock *)) +static void __locks_insert_block(struct file_lock *blocker_fl, + struct file_lock *waiter_fl, + bool conflict(struct file_lock_core *, + struct file_lock_core *)) { - struct file_lock *fl; - BUG_ON(!list_empty(&waiter->c.flc_blocked_member)); + struct file_lock_core *blocker = &blocker_fl->c; + struct file_lock_core *waiter = &waiter_fl->c; + struct file_lock_core *flc; + BUG_ON(!list_empty(&waiter->flc_blocked_member)); new_blocker: - list_for_each_entry(fl, &blocker->c.flc_blocked_requests, - c.flc_blocked_member) - if (conflict(fl, waiter)) { - blocker = fl; + list_for_each_entry(flc, &blocker->flc_blocked_requests, flc_blocked_member) + if (conflict(flc, waiter)) { + blocker = flc; goto new_blocker; } - waiter->c.flc_blocker = blocker; - list_add_tail(&waiter->c.flc_blocked_member, - &blocker->c.flc_blocked_requests); - if ((blocker->c.flc_flags & (FL_POSIX|FL_OFDLCK)) == FL_POSIX) - locks_insert_global_blocked(&waiter->c); + waiter->flc_blocker = file_lock(blocker); + list_add_tail(&waiter->flc_blocked_member, + &blocker->flc_blocked_requests); - /* The requests in waiter->fl_blocked are known to conflict with + if ((blocker->flc_flags & (FL_POSIX|FL_OFDLCK)) == (FL_POSIX|FL_OFDLCK)) + locks_insert_global_blocked(waiter); + + /* The requests in waiter->flc_blocked are known to conflict with * waiter, but might not conflict with blocker, or the requests * and lock which block it. So they all need to be woken. */ - __locks_wake_up_blocks(&waiter->c); + __locks_wake_up_blocks(waiter); } /* Must be called with flc_lock held. */ static void locks_insert_block(struct file_lock *blocker, struct file_lock *waiter, - bool conflict(struct file_lock *, - struct file_lock *)) + bool conflict(struct file_lock_core *, + struct file_lock_core *)) { spin_lock(&blocked_lock_lock); __locks_insert_block(blocker, waiter, conflict); @@ -846,12 +848,12 @@ locks_delete_lock_ctx(struct file_lock *fl, struct list_head *dispose) /* Determine if lock sys_fl blocks lock caller_fl. Common functionality * checks for shared/exclusive status of overlapping locks. */ -static bool locks_conflict(struct file_lock *caller_fl, - struct file_lock *sys_fl) +static bool locks_conflict(struct file_lock_core *caller_flc, + struct file_lock_core *sys_flc) { - if (lock_is_write(sys_fl)) + if (sys_flc->flc_type == F_WRLCK) return true; - if (lock_is_write(caller_fl)) + if (caller_flc->flc_type == F_WRLCK) return true; return false; } @@ -859,20 +861,23 @@ static bool locks_conflict(struct file_lock *caller_fl, /* Determine if lock sys_fl blocks lock caller_fl. POSIX specific * checking before calling the locks_conflict(). */ -static bool posix_locks_conflict(struct file_lock *caller_fl, - struct file_lock *sys_fl) +static bool posix_locks_conflict(struct file_lock_core *caller_flc, + struct file_lock_core *sys_flc) { + struct file_lock *caller_fl = file_lock(caller_flc); + struct file_lock *sys_fl = file_lock(sys_flc); + /* POSIX locks owned by the same process do not conflict with * each other. */ - if (posix_same_owner(&caller_fl->c, &sys_fl->c)) + if (posix_same_owner(caller_flc, sys_flc)) return false; /* Check whether they overlap */ if (!locks_overlap(caller_fl, sys_fl)) return false; - return locks_conflict(caller_fl, sys_fl); + return locks_conflict(caller_flc, sys_flc); } /* Determine if lock sys_fl blocks lock caller_fl. Used on xx_GETLK @@ -881,28 +886,31 @@ static bool posix_locks_conflict(struct file_lock *caller_fl, static bool posix_test_locks_conflict(struct file_lock *caller_fl, struct file_lock *sys_fl) { + struct file_lock_core *caller = &caller_fl->c; + struct file_lock_core *sys = &sys_fl->c; + /* F_UNLCK checks any locks on the same fd. */ if (lock_is_unlock(caller_fl)) { - if (!posix_same_owner(&caller_fl->c, &sys_fl->c)) + if (!posix_same_owner(caller, sys)) return false; return locks_overlap(caller_fl, sys_fl); } - return posix_locks_conflict(caller_fl, sys_fl); + return posix_locks_conflict(caller, sys); } /* Determine if lock sys_fl blocks lock caller_fl. FLOCK specific * checking before calling the locks_conflict(). */ -static bool flock_locks_conflict(struct file_lock *caller_fl, - struct file_lock *sys_fl) +static bool flock_locks_conflict(struct file_lock_core *caller_flc, + struct file_lock_core *sys_flc) { /* FLOCK locks referring to the same filp do not conflict with * each other. */ - if (caller_fl->c.flc_file == sys_fl->c.flc_file) + if (caller_flc->flc_file == sys_flc->flc_file) return false; - return locks_conflict(caller_fl, sys_fl); + return locks_conflict(caller_flc, sys_flc); } void @@ -980,25 +988,27 @@ EXPORT_SYMBOL(posix_test_lock); #define MAX_DEADLK_ITERATIONS 10 -/* Find a lock that the owner of the given block_fl is blocking on. */ -static struct file_lock *what_owner_is_waiting_for(struct file_lock *block_fl) +/* Find a lock that the owner of the given @blocker is blocking on. */ +static struct file_lock_core *what_owner_is_waiting_for(struct file_lock_core *blocker) { - struct file_lock *fl; + struct file_lock_core *flc; - hash_for_each_possible(blocked_hash, fl, c.flc_link, posix_owner_key(&block_fl->c)) { - if (posix_same_owner(&fl->c, &block_fl->c)) { - while (fl->c.flc_blocker) - fl = fl->c.flc_blocker; - return fl; + hash_for_each_possible(blocked_hash, flc, flc_link, posix_owner_key(blocker)) { + if (posix_same_owner(flc, blocker)) { + while (flc->flc_blocker) + flc = &flc->flc_blocker->c; + return flc; } } return NULL; } /* Must be called with the blocked_lock_lock held! */ -static int posix_locks_deadlock(struct file_lock *caller_fl, - struct file_lock *block_fl) +static bool posix_locks_deadlock(struct file_lock *caller_fl, + struct file_lock *block_fl) { + struct file_lock_core *caller = &caller_fl->c; + struct file_lock_core *blocker = &block_fl->c; int i = 0; lockdep_assert_held(&blocked_lock_lock); @@ -1007,16 +1017,16 @@ static int posix_locks_deadlock(struct file_lock *caller_fl, * This deadlock detector can't reasonably detect deadlocks with * FL_OFDLCK locks, since they aren't owned by a process, per-se. */ - if (caller_fl->c.flc_flags & FL_OFDLCK) - return 0; + if (caller->flc_flags & FL_OFDLCK) + return false; - while ((block_fl = what_owner_is_waiting_for(block_fl))) { + while ((blocker = what_owner_is_waiting_for(blocker))) { if (i++ > MAX_DEADLK_ITERATIONS) - return 0; - if (posix_same_owner(&caller_fl->c, &block_fl->c)) - return 1; + return false; + if (posix_same_owner(caller, blocker)) + return true; } - return 0; + return false; } /* Try to create a FLOCK lock on filp. We always insert new FLOCK locks @@ -1071,7 +1081,7 @@ static int flock_lock_inode(struct inode *inode, struct file_lock *request) find_conflict: list_for_each_entry(fl, &ctx->flc_flock, c.flc_list) { - if (!flock_locks_conflict(request, fl)) + if (!flock_locks_conflict(&request->c, &fl->c)) continue; error = -EAGAIN; if (!(request->c.flc_flags & FL_SLEEP)) @@ -1140,7 +1150,7 @@ static int posix_lock_inode(struct inode *inode, struct file_lock *request, */ if (request->c.flc_type != F_UNLCK) { list_for_each_entry(fl, &ctx->flc_posix, c.flc_list) { - if (!posix_locks_conflict(request, fl)) + if (!posix_locks_conflict(&request->c, &fl->c)) continue; if (fl->fl_lmops && fl->fl_lmops->lm_lock_expirable && (*fl->fl_lmops->lm_lock_expirable)(fl)) { @@ -1442,23 +1452,25 @@ static void time_out_leases(struct inode *inode, struct list_head *dispose) } } -static bool leases_conflict(struct file_lock *lease, struct file_lock *breaker) +static bool leases_conflict(struct file_lock_core *lc, struct file_lock_core *bc) { bool rc; + struct file_lock *lease = file_lock(lc); + struct file_lock *breaker = file_lock(bc); if (lease->fl_lmops->lm_breaker_owns_lease && lease->fl_lmops->lm_breaker_owns_lease(lease)) return false; - if ((breaker->c.flc_flags & FL_LAYOUT) != (lease->c.flc_flags & FL_LAYOUT)) { + if ((bc->flc_flags & FL_LAYOUT) != (lc->flc_flags & FL_LAYOUT)) { rc = false; goto trace; } - if ((breaker->c.flc_flags & FL_DELEG) && (lease->c.flc_flags & FL_LEASE)) { + if ((bc->flc_flags & FL_DELEG) && (lc->flc_flags & FL_LEASE)) { rc = false; goto trace; } - rc = locks_conflict(breaker, lease); + rc = locks_conflict(bc, lc); trace: trace_leases_conflict(rc, lease, breaker); return rc; @@ -1468,12 +1480,12 @@ static bool any_leases_conflict(struct inode *inode, struct file_lock *breaker) { struct file_lock_context *ctx = inode->i_flctx; - struct file_lock *fl; + struct file_lock_core *flc; lockdep_assert_held(&ctx->flc_lock); - list_for_each_entry(fl, &ctx->flc_lease, c.flc_list) { - if (leases_conflict(fl, breaker)) + list_for_each_entry(flc, &ctx->flc_lease, flc_list) { + if (leases_conflict(flc, &breaker->c)) return true; } return false; @@ -1529,7 +1541,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) } list_for_each_entry_safe(fl, tmp, &ctx->flc_lease, c.flc_list) { - if (!leases_conflict(fl, new_fl)) + if (!leases_conflict(&fl->c, &new_fl->c)) continue; if (want_write) { if (fl->c.flc_flags & FL_UNLOCK_PENDING)