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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,
	Jan Kara <jack@suse.cz>, Christoph Hellwig <hch@lst.de>
Subject: [PATCH 06/14] ext2: Convert to using invalidate_lock
Date: Thu, 15 Jul 2021 15:40:16 +0200	[thread overview]
Message-ID: <20210715134032.24868-6-jack@suse.cz> (raw)
In-Reply-To: <20210715133202.5975-1-jack@suse.cz>

Ext2 has its private dax_sem used for synchronizing page faults and
truncation. Use mapping->invalidate_lock instead as it is meant for this
purpose.

CC: <linux-ext4@vger.kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/ext2/ext2.h  | 11 -----------
 fs/ext2/file.c  |  7 +++----
 fs/ext2/inode.c | 12 ++++++------
 fs/ext2/super.c |  3 ---
 4 files changed, 9 insertions(+), 24 deletions(-)

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index b0a694820cb7..81907a041570 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -667,9 +667,6 @@ struct ext2_inode_info {
 	struct rw_semaphore xattr_sem;
 #endif
 	rwlock_t i_meta_lock;
-#ifdef CONFIG_FS_DAX
-	struct rw_semaphore dax_sem;
-#endif
 
 	/*
 	 * truncate_mutex is for serialising ext2_truncate() against
@@ -685,14 +682,6 @@ struct ext2_inode_info {
 #endif
 };
 
-#ifdef CONFIG_FS_DAX
-#define dax_sem_down_write(ext2_inode)	down_write(&(ext2_inode)->dax_sem)
-#define dax_sem_up_write(ext2_inode)	up_write(&(ext2_inode)->dax_sem)
-#else
-#define dax_sem_down_write(ext2_inode)
-#define dax_sem_up_write(ext2_inode)
-#endif
-
 /*
  * Inode dynamic state flags
  */
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index f98466acc672..eb97aa3d700e 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -81,7 +81,7 @@ static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
  *
  * mmap_lock (MM)
  *   sb_start_pagefault (vfs, freeze)
- *     ext2_inode_info->dax_sem
+ *     address_space->invalidate_lock
  *       address_space->i_mmap_rwsem or page_lock (mutually exclusive in DAX)
  *         ext2_inode_info->truncate_mutex
  *
@@ -91,7 +91,6 @@ static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
 static vm_fault_t ext2_dax_fault(struct vm_fault *vmf)
 {
 	struct inode *inode = file_inode(vmf->vma->vm_file);
-	struct ext2_inode_info *ei = EXT2_I(inode);
 	vm_fault_t ret;
 	bool write = (vmf->flags & FAULT_FLAG_WRITE) &&
 		(vmf->vma->vm_flags & VM_SHARED);
@@ -100,11 +99,11 @@ static vm_fault_t ext2_dax_fault(struct vm_fault *vmf)
 		sb_start_pagefault(inode->i_sb);
 		file_update_time(vmf->vma->vm_file);
 	}
-	down_read(&ei->dax_sem);
+	filemap_invalidate_lock_shared(inode->i_mapping);
 
 	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, NULL, &ext2_iomap_ops);
 
-	up_read(&ei->dax_sem);
+	filemap_invalidate_unlock_shared(inode->i_mapping);
 	if (write)
 		sb_end_pagefault(inode->i_sb);
 	return ret;
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index dadb121beb22..33f874f0fc4a 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1177,7 +1177,7 @@ static void ext2_free_branches(struct inode *inode, __le32 *p, __le32 *q, int de
 		ext2_free_data(inode, p, q);
 }
 
-/* dax_sem must be held when calling this function */
+/* mapping->invalidate_lock must be held when calling this function */
 static void __ext2_truncate_blocks(struct inode *inode, loff_t offset)
 {
 	__le32 *i_data = EXT2_I(inode)->i_data;
@@ -1194,7 +1194,7 @@ static void __ext2_truncate_blocks(struct inode *inode, loff_t offset)
 	iblock = (offset + blocksize-1) >> EXT2_BLOCK_SIZE_BITS(inode->i_sb);
 
 #ifdef CONFIG_FS_DAX
-	WARN_ON(!rwsem_is_locked(&ei->dax_sem));
+	WARN_ON(!rwsem_is_locked(&inode->i_mapping->invalidate_lock));
 #endif
 
 	n = ext2_block_to_path(inode, iblock, offsets, NULL);
@@ -1276,9 +1276,9 @@ static void ext2_truncate_blocks(struct inode *inode, loff_t offset)
 	if (ext2_inode_is_fast_symlink(inode))
 		return;
 
-	dax_sem_down_write(EXT2_I(inode));
+	filemap_invalidate_lock(inode->i_mapping);
 	__ext2_truncate_blocks(inode, offset);
-	dax_sem_up_write(EXT2_I(inode));
+	filemap_invalidate_unlock(inode->i_mapping);
 }
 
 static int ext2_setsize(struct inode *inode, loff_t newsize)
@@ -1308,10 +1308,10 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
 	if (error)
 		return error;
 
-	dax_sem_down_write(EXT2_I(inode));
+	filemap_invalidate_lock(inode->i_mapping);
 	truncate_setsize(inode, newsize);
 	__ext2_truncate_blocks(inode, newsize);
-	dax_sem_up_write(EXT2_I(inode));
+	filemap_invalidate_unlock(inode->i_mapping);
 
 	inode->i_mtime = inode->i_ctime = current_time(inode);
 	if (inode_needs_sync(inode)) {
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 21e09fbaa46f..987bcf32ed46 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -206,9 +206,6 @@ static void init_once(void *foo)
 	init_rwsem(&ei->xattr_sem);
 #endif
 	mutex_init(&ei->truncate_mutex);
-#ifdef CONFIG_FS_DAX
-	init_rwsem(&ei->dax_sem);
-#endif
 	inode_init_once(&ei->vfs_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>,
	linux-cifs@vger.kernel.org, "Darrick J. Wong" <djwong@kernel.org>,
	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, Jan Kara <jack@suse.cz>,
	ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>
Subject: [f2fs-dev] [PATCH 06/14] ext2: Convert to using invalidate_lock
Date: Thu, 15 Jul 2021 15:40:16 +0200	[thread overview]
Message-ID: <20210715134032.24868-6-jack@suse.cz> (raw)
In-Reply-To: <20210715133202.5975-1-jack@suse.cz>

Ext2 has its private dax_sem used for synchronizing page faults and
truncation. Use mapping->invalidate_lock instead as it is meant for this
purpose.

CC: <linux-ext4@vger.kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/ext2/ext2.h  | 11 -----------
 fs/ext2/file.c  |  7 +++----
 fs/ext2/inode.c | 12 ++++++------
 fs/ext2/super.c |  3 ---
 4 files changed, 9 insertions(+), 24 deletions(-)

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index b0a694820cb7..81907a041570 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -667,9 +667,6 @@ struct ext2_inode_info {
 	struct rw_semaphore xattr_sem;
 #endif
 	rwlock_t i_meta_lock;
-#ifdef CONFIG_FS_DAX
-	struct rw_semaphore dax_sem;
-#endif
 
 	/*
 	 * truncate_mutex is for serialising ext2_truncate() against
@@ -685,14 +682,6 @@ struct ext2_inode_info {
 #endif
 };
 
-#ifdef CONFIG_FS_DAX
-#define dax_sem_down_write(ext2_inode)	down_write(&(ext2_inode)->dax_sem)
-#define dax_sem_up_write(ext2_inode)	up_write(&(ext2_inode)->dax_sem)
-#else
-#define dax_sem_down_write(ext2_inode)
-#define dax_sem_up_write(ext2_inode)
-#endif
-
 /*
  * Inode dynamic state flags
  */
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index f98466acc672..eb97aa3d700e 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -81,7 +81,7 @@ static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
  *
  * mmap_lock (MM)
  *   sb_start_pagefault (vfs, freeze)
- *     ext2_inode_info->dax_sem
+ *     address_space->invalidate_lock
  *       address_space->i_mmap_rwsem or page_lock (mutually exclusive in DAX)
  *         ext2_inode_info->truncate_mutex
  *
@@ -91,7 +91,6 @@ static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
 static vm_fault_t ext2_dax_fault(struct vm_fault *vmf)
 {
 	struct inode *inode = file_inode(vmf->vma->vm_file);
-	struct ext2_inode_info *ei = EXT2_I(inode);
 	vm_fault_t ret;
 	bool write = (vmf->flags & FAULT_FLAG_WRITE) &&
 		(vmf->vma->vm_flags & VM_SHARED);
@@ -100,11 +99,11 @@ static vm_fault_t ext2_dax_fault(struct vm_fault *vmf)
 		sb_start_pagefault(inode->i_sb);
 		file_update_time(vmf->vma->vm_file);
 	}
-	down_read(&ei->dax_sem);
+	filemap_invalidate_lock_shared(inode->i_mapping);
 
 	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, NULL, &ext2_iomap_ops);
 
-	up_read(&ei->dax_sem);
+	filemap_invalidate_unlock_shared(inode->i_mapping);
 	if (write)
 		sb_end_pagefault(inode->i_sb);
 	return ret;
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index dadb121beb22..33f874f0fc4a 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1177,7 +1177,7 @@ static void ext2_free_branches(struct inode *inode, __le32 *p, __le32 *q, int de
 		ext2_free_data(inode, p, q);
 }
 
-/* dax_sem must be held when calling this function */
+/* mapping->invalidate_lock must be held when calling this function */
 static void __ext2_truncate_blocks(struct inode *inode, loff_t offset)
 {
 	__le32 *i_data = EXT2_I(inode)->i_data;
@@ -1194,7 +1194,7 @@ static void __ext2_truncate_blocks(struct inode *inode, loff_t offset)
 	iblock = (offset + blocksize-1) >> EXT2_BLOCK_SIZE_BITS(inode->i_sb);
 
 #ifdef CONFIG_FS_DAX
-	WARN_ON(!rwsem_is_locked(&ei->dax_sem));
+	WARN_ON(!rwsem_is_locked(&inode->i_mapping->invalidate_lock));
 #endif
 
 	n = ext2_block_to_path(inode, iblock, offsets, NULL);
@@ -1276,9 +1276,9 @@ static void ext2_truncate_blocks(struct inode *inode, loff_t offset)
 	if (ext2_inode_is_fast_symlink(inode))
 		return;
 
-	dax_sem_down_write(EXT2_I(inode));
+	filemap_invalidate_lock(inode->i_mapping);
 	__ext2_truncate_blocks(inode, offset);
-	dax_sem_up_write(EXT2_I(inode));
+	filemap_invalidate_unlock(inode->i_mapping);
 }
 
 static int ext2_setsize(struct inode *inode, loff_t newsize)
@@ -1308,10 +1308,10 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
 	if (error)
 		return error;
 
-	dax_sem_down_write(EXT2_I(inode));
+	filemap_invalidate_lock(inode->i_mapping);
 	truncate_setsize(inode, newsize);
 	__ext2_truncate_blocks(inode, newsize);
-	dax_sem_up_write(EXT2_I(inode));
+	filemap_invalidate_unlock(inode->i_mapping);
 
 	inode->i_mtime = inode->i_ctime = current_time(inode);
 	if (inode_needs_sync(inode)) {
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 21e09fbaa46f..987bcf32ed46 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -206,9 +206,6 @@ static void init_once(void *foo)
 	init_rwsem(&ei->xattr_sem);
 #endif
 	mutex_init(&ei->truncate_mutex);
-#ifdef CONFIG_FS_DAX
-	init_rwsem(&ei->dax_sem);
-#endif
 	inode_init_once(&ei->vfs_inode);
 }
 
-- 
2.26.2



_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel

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

Thread overview: 40+ 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 ` Jan Kara [this message]
2021-07-15 13:40   ` [f2fs-dev] [PATCH 06/14] ext2: Convert to using invalidate_lock Jan Kara
2021-07-15 13:40 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara
2021-07-15 13:40   ` [f2fs-dev] " 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 06/14] ext2: Convert to using invalidate_lock 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 06/14] ext2: Convert to using invalidate_lock Jan Kara
2021-06-16  5:35   ` Christoph Hellwig
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 06/14] ext2: Convert to using invalidate_lock Jan Kara

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