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From: Jan Kara <jack@suse.cz>
To: <linux-fsdevel@vger.kernel.org>
Cc: <linux-ext4@vger.kernel.org>,
	Christoph Hellwig <hch@infradead.org>,
	"Darrick J. Wong" <djwong@kernel.org>, Ted Tso <tytso@mit.edu>,
	Dave Chinner <david@fromorbit.com>,
	Matthew Wilcox <willy@infradead.org>, <linux-mm@kvack.org>,
	<linux-xfs@vger.kernel.org>,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org,
	Pavel Reichl <preichl@redhat.com>,
	Dave Chinner <dchinner@redhat.com>,
	Eric Sandeen <sandeen@redhat.com>,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	Christoph Hellwig <hch@lst.de>, Jan Kara <jack@suse.cz>
Subject: [PATCH 07/14] xfs: Refactor xfs_isilocked()
Date: Thu, 15 Jul 2021 15:40:17 +0200	[thread overview]
Message-ID: <20210715134032.24868-7-jack@suse.cz> (raw)
In-Reply-To: <20210715133202.5975-1-jack@suse.cz>

From: Pavel Reichl <preichl@redhat.com>

Introduce a new __xfs_rwsem_islocked predicate to encapsulate checking
the state of a rw_semaphore, then refactor xfs_isilocked to use it.

Signed-off-by: Pavel Reichl <preichl@redhat.com>
Suggested-by: Dave Chinner <dchinner@redhat.com>
Suggested-by: Eric Sandeen <sandeen@redhat.com>
Suggested-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/xfs/xfs_inode.c | 34 ++++++++++++++++++++++++++--------
 fs/xfs/xfs_inode.h |  2 +-
 2 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index a835ceb79ba5..359e2cd44ad7 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -343,9 +343,29 @@ xfs_ilock_demote(
 }
 
 #if defined(DEBUG) || defined(XFS_WARN)
-int
+static inline bool
+__xfs_rwsem_islocked(
+	struct rw_semaphore	*rwsem,
+	bool			shared)
+{
+	if (!debug_locks)
+		return rwsem_is_locked(rwsem);
+
+	if (!shared)
+		return lockdep_is_held_type(rwsem, 0);
+
+	/*
+	 * We are checking that the lock is held at least in shared
+	 * mode but don't care that it might be held exclusively
+	 * (i.e. shared | excl). Hence we check if the lock is held
+	 * in any mode rather than an explicit shared mode.
+	 */
+	return lockdep_is_held_type(rwsem, -1);
+}
+
+bool
 xfs_isilocked(
-	xfs_inode_t		*ip,
+	struct xfs_inode	*ip,
 	uint			lock_flags)
 {
 	if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
@@ -360,15 +380,13 @@ xfs_isilocked(
 		return rwsem_is_locked(&ip->i_mmaplock.mr_lock);
 	}
 
-	if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
-		if (!(lock_flags & XFS_IOLOCK_SHARED))
-			return !debug_locks ||
-				lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0);
-		return rwsem_is_locked(&VFS_I(ip)->i_rwsem);
+	if (lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) {
+		return __xfs_rwsem_islocked(&VFS_I(ip)->i_rwsem,
+				(lock_flags & XFS_IOLOCK_SHARED));
 	}
 
 	ASSERT(0);
-	return 0;
+	return false;
 }
 #endif
 
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 4b6703dbffb8..4b5202ae8ebb 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -410,7 +410,7 @@ void		xfs_ilock(xfs_inode_t *, uint);
 int		xfs_ilock_nowait(xfs_inode_t *, uint);
 void		xfs_iunlock(xfs_inode_t *, uint);
 void		xfs_ilock_demote(xfs_inode_t *, uint);
-int		xfs_isilocked(xfs_inode_t *, uint);
+bool		xfs_isilocked(struct xfs_inode *, uint);
 uint		xfs_ilock_data_map_shared(struct xfs_inode *);
 uint		xfs_ilock_attr_map_shared(struct xfs_inode *);
 
-- 
2.26.2


WARNING: multiple messages have this Message-ID
From: Jan Kara <jack@suse.cz>
To: <linux-fsdevel@vger.kernel.org>
Cc: linux-xfs@vger.kernel.org, Ted Tso <tytso@mit.edu>,
	Eric Sandeen <sandeen@redhat.com>,
	linux-cifs@vger.kernel.org, "Darrick J. Wong" <djwong@kernel.org>,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	Dave Chinner <david@fromorbit.com>,
	Matthew Wilcox <willy@infradead.org>,
	linux-f2fs-devel@lists.sourceforge.net,
	Christoph Hellwig <hch@infradead.org>,
	linux-mm@kvack.org, Dave Chinner <dchinner@redhat.com>,
	Jan Kara <jack@suse.cz>,
	ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>, Pavel Reichl <preichl@redhat.com>
Subject: [f2fs-dev] [PATCH 07/14] xfs: Refactor xfs_isilocked()
Date: Thu, 15 Jul 2021 15:40:17 +0200	[thread overview]
Message-ID: <20210715134032.24868-7-jack@suse.cz> (raw)
In-Reply-To: <20210715133202.5975-1-jack@suse.cz>

From: Pavel Reichl <preichl@redhat.com>

Introduce a new __xfs_rwsem_islocked predicate to encapsulate checking
the state of a rw_semaphore, then refactor xfs_isilocked to use it.

Signed-off-by: Pavel Reichl <preichl@redhat.com>
Suggested-by: Dave Chinner <dchinner@redhat.com>
Suggested-by: Eric Sandeen <sandeen@redhat.com>
Suggested-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/xfs/xfs_inode.c | 34 ++++++++++++++++++++++++++--------
 fs/xfs/xfs_inode.h |  2 +-
 2 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index a835ceb79ba5..359e2cd44ad7 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -343,9 +343,29 @@ xfs_ilock_demote(
 }
 
 #if defined(DEBUG) || defined(XFS_WARN)
-int
+static inline bool
+__xfs_rwsem_islocked(
+	struct rw_semaphore	*rwsem,
+	bool			shared)
+{
+	if (!debug_locks)
+		return rwsem_is_locked(rwsem);
+
+	if (!shared)
+		return lockdep_is_held_type(rwsem, 0);
+
+	/*
+	 * We are checking that the lock is held at least in shared
+	 * mode but don't care that it might be held exclusively
+	 * (i.e. shared | excl). Hence we check if the lock is held
+	 * in any mode rather than an explicit shared mode.
+	 */
+	return lockdep_is_held_type(rwsem, -1);
+}
+
+bool
 xfs_isilocked(
-	xfs_inode_t		*ip,
+	struct xfs_inode	*ip,
 	uint			lock_flags)
 {
 	if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
@@ -360,15 +380,13 @@ xfs_isilocked(
 		return rwsem_is_locked(&ip->i_mmaplock.mr_lock);
 	}
 
-	if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
-		if (!(lock_flags & XFS_IOLOCK_SHARED))
-			return !debug_locks ||
-				lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0);
-		return rwsem_is_locked(&VFS_I(ip)->i_rwsem);
+	if (lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) {
+		return __xfs_rwsem_islocked(&VFS_I(ip)->i_rwsem,
+				(lock_flags & XFS_IOLOCK_SHARED));
 	}
 
 	ASSERT(0);
-	return 0;
+	return false;
 }
 #endif
 
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 4b6703dbffb8..4b5202ae8ebb 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -410,7 +410,7 @@ void		xfs_ilock(xfs_inode_t *, uint);
 int		xfs_ilock_nowait(xfs_inode_t *, uint);
 void		xfs_iunlock(xfs_inode_t *, uint);
 void		xfs_ilock_demote(xfs_inode_t *, uint);
-int		xfs_isilocked(xfs_inode_t *, uint);
+bool		xfs_isilocked(struct xfs_inode *, uint);
 uint		xfs_ilock_data_map_shared(struct xfs_inode *);
 uint		xfs_ilock_attr_map_shared(struct xfs_inode *);
 
-- 
2.26.2



_______________________________________________
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  parent reply	other threads:[~2021-07-15 13:40 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15 13:40 [PATCH 0/14 v10] fs: Hole punch vs page cache filling races Jan Kara
2021-07-15 13:40 ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 01/14] mm: Fix comments mentioning i_mutex Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 02/14] documentation: Sync file_operations members with reality Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 03/14] mm: Protect operations adding pages to page cache with invalidate_lock Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 05/14] ext4: Convert to use mapping->invalidate_lock Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 06/14] ext2: Convert to using invalidate_lock Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` Jan Kara [this message]
2021-07-15 13:40   ` [f2fs-dev] [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara
2021-07-15 13:40 ` [PATCH 08/14] xfs: Convert to use invalidate_lock Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 09/14] xfs: Convert double locking of MMAPLOCK to use VFS helpers Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 10/14] zonefs: Convert to using invalidate_lock Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 11/14] f2fs: " Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 12/14] fuse: " Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 13/14] ceph: Fix race between hole punch and page fault Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-15 13:40 ` [PATCH 14/14] cifs: " Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " Jan Kara
2021-07-16  6:02 ` [PATCH 0/14 v10] fs: Hole punch vs page cache filling races Christoph Hellwig
2021-07-16  6:02   ` [f2fs-dev] " Christoph Hellwig
2021-07-16 16:43   ` Darrick J. Wong
2021-07-16 16:43     ` [f2fs-dev] " Darrick J. Wong
2021-07-16 16:57     ` Jan Kara
2021-07-16 16:57       ` [f2fs-dev] " Jan Kara
  -- strict thread matches above, loose matches on Subject: below --
2021-07-12 16:55 [PATCH 0/14 v9] " Jan Kara
2021-07-12 16:55 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara
2021-06-15  9:17 [PATCH 0/14 v8] fs: Hole punch vs page cache filling races Jan Kara
2021-06-15  9:17 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara
2021-06-16  5:37   ` Christoph Hellwig
2021-06-16  8:53     ` Jan Kara
2021-06-16 15:47       ` Darrick J. Wong
2021-06-16 15:57         ` Jan Kara
2021-06-17 16:29           ` Darrick J. Wong
2021-06-17 16:32             ` Darrick J. Wong
2021-06-17  7:53   ` Christoph Hellwig
2021-06-17  8:53     ` Jan Kara
2021-06-17  8:54       ` Christoph Hellwig
2021-06-17 16:16   ` Darrick J. Wong
2021-06-07 14:52 [PATCH 0/14 v7] fs: Hole punch vs page cache filling races Jan Kara
2021-06-07 14:52 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara
2021-06-07 15:49   ` Darrick J. Wong
2021-06-08 22:18   ` Dave Chinner

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