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
next prev parent reply other threads:[~2021-06-07 14:52 UTC|newest]
Thread overview: 41+ 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 ` [PATCH 01/14] mm: Fix comments mentioning i_mutex Jan Kara
2021-06-07 15:31 ` Darrick J. Wong
2021-06-10 9:06 ` Ming Lei
2021-06-10 10:40 ` Jan Kara
2021-06-07 14:52 ` [PATCH 02/14] documentation: Sync file_operations members with reality 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 16:09 ` Darrick J. Wong
2021-06-08 12:19 ` 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 15:46 ` 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 ` [PATCH 06/14] ext2: Convert to using invalidate_lock Jan Kara
2021-06-07 14:52 ` Jan Kara [this message]
2021-06-07 15:49 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Darrick J. Wong
2021-06-08 22:18 ` Dave Chinner
2021-06-07 14:52 ` [PATCH 08/14] xfs: Convert to use invalidate_lock Jan Kara
2021-06-07 15:56 ` Darrick J. Wong
2021-06-08 12:23 ` 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 15:57 ` Darrick J. Wong
2021-06-07 14:52 ` [PATCH 10/14] zonefs: Convert to using invalidate_lock Jan Kara
2021-06-07 14:52 ` [PATCH 11/14] f2fs: " Jan Kara
2021-06-07 14:52 ` [PATCH 12/14] fuse: " Jan Kara
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 ` [PATCH 14/14] cifs: " Jan Kara
2021-06-08 11:54 ` [PATCH 0/14 v7] fs: Hole punch vs page cache filling races 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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