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From: Jan Kara <jack@suse.cz>
To: <linux-fsdevel@vger.kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>,
	Dave Chinner <david@fromorbit.com>,
	ceph-devel@vger.kernel.org, Chao Yu <yuchao0@huawei.com>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	Jaegeuk Kim <jaegeuk@kernel.org>,
	Jeff Layton <jlayton@kernel.org>,
	Johannes Thumshirn <jth@kernel.org>,
	linux-cifs@vger.kernel.org, <linux-ext4@vger.kernel.org>,
	linux-f2fs-devel@lists.sourceforge.net, <linux-mm@kvack.org>,
	<linux-xfs@vger.kernel.org>, Miklos Szeredi <miklos@szeredi.hu>,
	Steve French <sfrench@samba.org>, Ted Tso <tytso@mit.edu>,
	Matthew Wilcox <willy@infradead.org>,
	Pavel Reichl <preichl@redhat.com>,
	Dave Chinner <dchinner@redhat.com>,
	Eric Sandeen <sandeen@redhat.com>, Christoph Hellwig <hch@lst.de>,
	Jan Kara <jack@suse.cz>
Subject: [PATCH 07/14] xfs: Refactor xfs_isilocked()
Date: Mon,  7 Jun 2021 16:52:17 +0200	[thread overview]
Message-ID: <20210607145236.31852-7-jack@suse.cz> (raw)
In-Reply-To: <20210607144631.8717-1-jack@suse.cz>

From: Pavel Reichl <preichl@redhat.com>

Refactor xfs_isilocked() to use newly introduced __xfs_rwsem_islocked().
__xfs_rwsem_islocked() is a helper function which encapsulates checking
state of rw_semaphores hold by inode.

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: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/xfs/xfs_inode.c | 39 +++++++++++++++++++++++++++++++--------
 fs/xfs/xfs_inode.h | 21 ++++++++++++++-------
 2 files changed, 45 insertions(+), 15 deletions(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 0369eb22c1bb..6247977870bd 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -342,9 +342,34 @@ xfs_ilock_demote(
 }
 
 #if defined(DEBUG) || defined(XFS_WARN)
-int
+static inline bool
+__xfs_rwsem_islocked(
+	struct rw_semaphore	*rwsem,
+	int			lock_flags,
+	int			shift)
+{
+	lock_flags >>= shift;
+
+	if (!debug_locks)
+		return rwsem_is_locked(rwsem);
+	/*
+	 * If the shared flag is not set, pass 0 to explicitly check for
+	 * exclusive access to the lock. If the shared flag is set, we typically
+	 * want to make sure the lock is at least held in shared mode
+	 * (i.e., shared | excl) but we don't necessarily care that it might
+	 * actually be held exclusive. Therefore, pass -1 to check whether the
+	 * lock is held in any mode rather than one of the explicit shared mode
+	 * values (1 or 2)."
+	 */
+	if (lock_flags & (1 << XFS_SHARED_LOCK_SHIFT)) {
+		return lockdep_is_held_type(rwsem, -1);
+	}
+	return lockdep_is_held_type(rwsem, 0);
+}
+
+bool
 xfs_isilocked(
-	xfs_inode_t		*ip,
+	struct xfs_inode	*ip,
 	uint			lock_flags)
 {
 	if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
@@ -359,15 +384,13 @@ 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_FLAG_SHIFT);
 	}
 
 	ASSERT(0);
-	return 0;
+	return false;
 }
 #endif
 
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index ca826cfba91c..1c0e15c480bc 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -262,12 +262,19 @@ static inline bool xfs_inode_has_bigtime(struct xfs_inode *ip)
  * Bit ranges:	1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
  *		1<<16 - 1<<32-1 -- lockdep annotation (integers)
  */
-#define	XFS_IOLOCK_EXCL		(1<<0)
-#define	XFS_IOLOCK_SHARED	(1<<1)
-#define	XFS_ILOCK_EXCL		(1<<2)
-#define	XFS_ILOCK_SHARED	(1<<3)
-#define	XFS_MMAPLOCK_EXCL	(1<<4)
-#define	XFS_MMAPLOCK_SHARED	(1<<5)
+
+#define XFS_IOLOCK_FLAG_SHIFT	0
+#define XFS_ILOCK_FLAG_SHIFT	2
+#define XFS_MMAPLOCK_FLAG_SHIFT	4
+
+#define XFS_SHARED_LOCK_SHIFT	1
+
+#define XFS_IOLOCK_EXCL		(1 << XFS_IOLOCK_FLAG_SHIFT)
+#define XFS_IOLOCK_SHARED	(XFS_IOLOCK_EXCL << XFS_SHARED_LOCK_SHIFT)
+#define XFS_ILOCK_EXCL		(1 << XFS_ILOCK_FLAG_SHIFT)
+#define XFS_ILOCK_SHARED	(XFS_ILOCK_EXCL << XFS_SHARED_LOCK_SHIFT)
+#define XFS_MMAPLOCK_EXCL	(1 << XFS_MMAPLOCK_FLAG_SHIFT)
+#define XFS_MMAPLOCK_SHARED	(XFS_MMAPLOCK_EXCL << XFS_SHARED_LOCK_SHIFT)
 
 #define XFS_LOCK_MASK		(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
 				| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
@@ -410,7 +417,7 @@ 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: Jan Kara <jack@suse.cz>, Dave Chinner <david@fromorbit.com>,
	linux-mm@kvack.org, Christoph Hellwig <hch@lst.de>,
	linux-cifs@vger.kernel.org,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	Matthew Wilcox <willy@infradead.org>,
	Christoph Hellwig <hch@infradead.org>,
	linux-ext4@vger.kernel.org, Eric Sandeen <sandeen@redhat.com>,
	Dave Chinner <dchinner@redhat.com>,
	Jaegeuk Kim <jaegeuk@kernel.org>,
	ceph-devel@vger.kernel.org, linux-xfs@vger.kernel.org,
	Damien Le Moal <damien.lemoal@wdc.com>, Ted Tso <tytso@mit.edu>,
	Miklos Szeredi <miklos@szeredi.hu>,
	Jeff Layton <jlayton@kernel.org>,
	linux-f2fs-devel@lists.sourceforge.net,
	Steve French <sfrench@samba.org>,
	Pavel Reichl <preichl@redhat.com>,
	Johannes Thumshirn <jth@kernel.org>
Subject: [f2fs-dev] [PATCH 07/14] xfs: Refactor xfs_isilocked()
Date: Mon,  7 Jun 2021 16:52:17 +0200	[thread overview]
Message-ID: <20210607145236.31852-7-jack@suse.cz> (raw)
In-Reply-To: <20210607144631.8717-1-jack@suse.cz>

From: Pavel Reichl <preichl@redhat.com>

Refactor xfs_isilocked() to use newly introduced __xfs_rwsem_islocked().
__xfs_rwsem_islocked() is a helper function which encapsulates checking
state of rw_semaphores hold by inode.

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: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/xfs/xfs_inode.c | 39 +++++++++++++++++++++++++++++++--------
 fs/xfs/xfs_inode.h | 21 ++++++++++++++-------
 2 files changed, 45 insertions(+), 15 deletions(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 0369eb22c1bb..6247977870bd 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -342,9 +342,34 @@ xfs_ilock_demote(
 }
 
 #if defined(DEBUG) || defined(XFS_WARN)
-int
+static inline bool
+__xfs_rwsem_islocked(
+	struct rw_semaphore	*rwsem,
+	int			lock_flags,
+	int			shift)
+{
+	lock_flags >>= shift;
+
+	if (!debug_locks)
+		return rwsem_is_locked(rwsem);
+	/*
+	 * If the shared flag is not set, pass 0 to explicitly check for
+	 * exclusive access to the lock. If the shared flag is set, we typically
+	 * want to make sure the lock is at least held in shared mode
+	 * (i.e., shared | excl) but we don't necessarily care that it might
+	 * actually be held exclusive. Therefore, pass -1 to check whether the
+	 * lock is held in any mode rather than one of the explicit shared mode
+	 * values (1 or 2)."
+	 */
+	if (lock_flags & (1 << XFS_SHARED_LOCK_SHIFT)) {
+		return lockdep_is_held_type(rwsem, -1);
+	}
+	return lockdep_is_held_type(rwsem, 0);
+}
+
+bool
 xfs_isilocked(
-	xfs_inode_t		*ip,
+	struct xfs_inode	*ip,
 	uint			lock_flags)
 {
 	if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
@@ -359,15 +384,13 @@ 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_FLAG_SHIFT);
 	}
 
 	ASSERT(0);
-	return 0;
+	return false;
 }
 #endif
 
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index ca826cfba91c..1c0e15c480bc 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -262,12 +262,19 @@ static inline bool xfs_inode_has_bigtime(struct xfs_inode *ip)
  * Bit ranges:	1<<1  - 1<<16-1 -- iolock/ilock modes (bitfield)
  *		1<<16 - 1<<32-1 -- lockdep annotation (integers)
  */
-#define	XFS_IOLOCK_EXCL		(1<<0)
-#define	XFS_IOLOCK_SHARED	(1<<1)
-#define	XFS_ILOCK_EXCL		(1<<2)
-#define	XFS_ILOCK_SHARED	(1<<3)
-#define	XFS_MMAPLOCK_EXCL	(1<<4)
-#define	XFS_MMAPLOCK_SHARED	(1<<5)
+
+#define XFS_IOLOCK_FLAG_SHIFT	0
+#define XFS_ILOCK_FLAG_SHIFT	2
+#define XFS_MMAPLOCK_FLAG_SHIFT	4
+
+#define XFS_SHARED_LOCK_SHIFT	1
+
+#define XFS_IOLOCK_EXCL		(1 << XFS_IOLOCK_FLAG_SHIFT)
+#define XFS_IOLOCK_SHARED	(XFS_IOLOCK_EXCL << XFS_SHARED_LOCK_SHIFT)
+#define XFS_ILOCK_EXCL		(1 << XFS_ILOCK_FLAG_SHIFT)
+#define XFS_ILOCK_SHARED	(XFS_ILOCK_EXCL << XFS_SHARED_LOCK_SHIFT)
+#define XFS_MMAPLOCK_EXCL	(1 << XFS_MMAPLOCK_FLAG_SHIFT)
+#define XFS_MMAPLOCK_SHARED	(XFS_MMAPLOCK_EXCL << XFS_SHARED_LOCK_SHIFT)
 
 #define XFS_LOCK_MASK		(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
 				| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
@@ -410,7 +417,7 @@ 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:[~2021-06-07 14:52 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-07 14:52 [PATCH 0/14 v7] fs: Hole punch vs page cache filling races Jan Kara
2021-06-07 14:52 ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` [PATCH 01/14] mm: Fix comments mentioning i_mutex Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 15:31   ` Darrick J. Wong
2021-06-07 15:31     ` [f2fs-dev] " Darrick J. Wong
2021-06-10  9:06   ` Ming Lei
2021-06-10  9:06     ` [f2fs-dev] " Ming Lei
2021-06-10 10:40     ` Jan Kara
2021-06-10 10:40       ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` [PATCH 02/14] documentation: Sync file_operations members with reality Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` [PATCH 03/14] mm: Protect operations adding pages to page cache with invalidate_lock Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 16:09   ` Darrick J. Wong
2021-06-07 16:09     ` [f2fs-dev] " Darrick J. Wong
2021-06-08 12:19     ` Jan Kara
2021-06-08 12:19       ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 15:46   ` Darrick J. Wong
2021-06-07 15:46     ` [f2fs-dev] " Darrick J. Wong
2021-06-07 14:52 ` [PATCH 05/14] ext4: Convert to use mapping->invalidate_lock Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` [PATCH 06/14] ext2: Convert to using invalidate_lock Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` Jan Kara [this message]
2021-06-07 14:52   ` [f2fs-dev] [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara
2021-06-07 15:49   ` Darrick J. Wong
2021-06-07 15:49     ` [f2fs-dev] " Darrick J. Wong
2021-06-08 22:18   ` Dave Chinner
2021-06-08 22:18     ` [f2fs-dev] " Dave Chinner
2021-06-07 14:52 ` [PATCH 08/14] xfs: Convert to use invalidate_lock Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 15:56   ` Darrick J. Wong
2021-06-07 15:56     ` [f2fs-dev] " Darrick J. Wong
2021-06-08 12:23     ` Jan Kara
2021-06-08 12:23       ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` [PATCH 09/14] xfs: Convert double locking of MMAPLOCK to use VFS helpers Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 15:57   ` Darrick J. Wong
2021-06-07 15:57     ` [f2fs-dev] " Darrick J. Wong
2021-06-07 14:52 ` [PATCH 10/14] zonefs: Convert to using invalidate_lock Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` [PATCH 11/14] f2fs: " Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` [PATCH 12/14] fuse: " Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-10 12:42   ` Miklos Szeredi
2021-06-10 12:42     ` [f2fs-dev] " Miklos Szeredi
2021-06-10 12:42     ` Miklos Szeredi
2021-06-07 14:52 ` [PATCH 13/14] ceph: Fix race between hole punch and page fault Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-07 14:52 ` [PATCH 14/14] cifs: " Jan Kara
2021-06-07 14:52   ` [f2fs-dev] " Jan Kara
2021-06-08 11:54 ` [PATCH 0/14 v7] fs: Hole punch vs page cache filling races Jan Kara
2021-06-08 11:54   ` [f2fs-dev] " Jan Kara
2021-06-15  9:17 [PATCH 0/14 v8] " 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
2021-07-12 16:55 [PATCH 0/14 v9] fs: Hole punch vs page cache filling races Jan Kara
2021-07-12 16:55 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara
2021-07-15 13:40 [PATCH 0/14 v10] fs: Hole punch vs page cache filling races Jan Kara
2021-07-15 13:40 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara

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