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Message-Id: <20210615091814.28626-11-jack@suse.cz>
Date: Tue, 15 Jun 2021 11:18:01 +0200
From: Jan Kara <jack@...e.cz>
To: <linux-fsdevel@...r.kernel.org>
Cc: Christoph Hellwig <hch@...radead.org>,
Dave Chinner <david@...morbit.com>, ceph-devel@...r.kernel.org,
Chao Yu <yuchao0@...wei.com>,
Damien Le Moal <damien.lemoal@....com>,
"Darrick J. Wong" <darrick.wong@...cle.com>,
Jaegeuk Kim <jaegeuk@...nel.org>,
Jeff Layton <jlayton@...nel.org>,
Johannes Thumshirn <jth@...nel.org>,
linux-cifs@...r.kernel.org, <linux-ext4@...r.kernel.org>,
linux-f2fs-devel@...ts.sourceforge.net, <linux-mm@...ck.org>,
<linux-xfs@...r.kernel.org>, Miklos Szeredi <miklos@...redi.hu>,
Steve French <sfrench@...ba.org>, Ted Tso <tytso@....edu>,
Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>
Subject: [PATCH 11/14] f2fs: Convert to using invalidate_lock
Use invalidate_lock instead of f2fs' private i_mmap_sem. The intended
purpose is exactly the same. By this conversion we fix a long standing
race between hole punching and read(2) / readahead(2) paths that can
lead to stale page cache contents.
CC: Jaegeuk Kim <jaegeuk@...nel.org>
CC: Chao Yu <yuchao0@...wei.com>
CC: linux-f2fs-devel@...ts.sourceforge.net
Acked-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Jan Kara <jack@...e.cz>
---
fs/f2fs/data.c | 4 ++--
fs/f2fs/f2fs.h | 1 -
fs/f2fs/file.c | 62 ++++++++++++++++++++++++-------------------------
fs/f2fs/super.c | 1 -
4 files changed, 32 insertions(+), 36 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 009a09fb9d88..4c2bad8edcf4 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3165,12 +3165,12 @@ static void f2fs_write_failed(struct address_space *mapping, loff_t to)
/* In the fs-verity case, f2fs_end_enable_verity() does the truncate */
if (to > i_size && !f2fs_verity_in_progress(inode)) {
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(mapping);
truncate_pagecache(inode, i_size);
f2fs_truncate_blocks(inode, i_size, true);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(mapping);
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
}
}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c83d90125ebd..ef0eb8b43fff 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -748,7 +748,6 @@ struct f2fs_inode_info {
/* avoid racing between foreground op and gc */
struct rw_semaphore i_gc_rwsem[2];
- struct rw_semaphore i_mmap_sem;
struct rw_semaphore i_xattr_sem; /* avoid racing between reading and changing EAs */
int i_extra_isize; /* size of extra space located in i_addr */
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index ceb575f99048..75e1fe908b7b 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -38,10 +38,7 @@ static vm_fault_t f2fs_filemap_fault(struct vm_fault *vmf)
struct inode *inode = file_inode(vmf->vma->vm_file);
vm_fault_t ret;
- down_read(&F2FS_I(inode)->i_mmap_sem);
ret = filemap_fault(vmf);
- up_read(&F2FS_I(inode)->i_mmap_sem);
-
if (!ret)
f2fs_update_iostat(F2FS_I_SB(inode), APP_MAPPED_READ_IO,
F2FS_BLKSIZE);
@@ -102,7 +99,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
f2fs_bug_on(sbi, f2fs_has_inline_data(inode));
file_update_time(vmf->vma->vm_file);
- down_read(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock_shared(inode->i_mapping);
lock_page(page);
if (unlikely(page->mapping != inode->i_mapping ||
page_offset(page) > i_size_read(inode) ||
@@ -161,7 +158,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
trace_f2fs_vm_page_mkwrite(page, DATA);
out_sem:
- up_read(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock_shared(inode->i_mapping);
sb_end_pagefault(inode->i_sb);
err:
@@ -942,7 +939,7 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
}
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(inode->i_mapping);
truncate_setsize(inode, attr->ia_size);
@@ -952,7 +949,7 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
* do not trim all blocks after i_size if target size is
* larger than i_size.
*/
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(inode->i_mapping);
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
if (err)
return err;
@@ -1097,7 +1094,7 @@ static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
blk_end = (loff_t)pg_end << PAGE_SHIFT;
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(mapping);
truncate_inode_pages_range(mapping, blk_start,
blk_end - 1);
@@ -1106,7 +1103,7 @@ static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
ret = f2fs_truncate_hole(inode, pg_start, pg_end);
f2fs_unlock_op(sbi);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(mapping);
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
}
}
@@ -1341,7 +1338,7 @@ static int f2fs_do_collapse(struct inode *inode, loff_t offset, loff_t len)
/* avoid gc operation during block exchange */
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(inode->i_mapping);
f2fs_lock_op(sbi);
f2fs_drop_extent_tree(inode);
@@ -1349,7 +1346,7 @@ static int f2fs_do_collapse(struct inode *inode, loff_t offset, loff_t len)
ret = __exchange_data_block(inode, inode, end, start, nrpages - end, true);
f2fs_unlock_op(sbi);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(inode->i_mapping);
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
return ret;
}
@@ -1380,13 +1377,13 @@ static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
return ret;
/* write out all moved pages, if possible */
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(inode->i_mapping);
filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
truncate_pagecache(inode, offset);
new_size = i_size_read(inode) - len;
ret = f2fs_truncate_blocks(inode, new_size, true);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(inode->i_mapping);
if (!ret)
f2fs_i_size_write(inode, new_size);
return ret;
@@ -1486,7 +1483,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
pgoff_t end;
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(mapping);
truncate_pagecache_range(inode,
(loff_t)index << PAGE_SHIFT,
@@ -1498,7 +1495,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
ret = f2fs_get_dnode_of_data(&dn, index, ALLOC_NODE);
if (ret) {
f2fs_unlock_op(sbi);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(mapping);
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
goto out;
}
@@ -1510,7 +1507,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
f2fs_put_dnode(&dn);
f2fs_unlock_op(sbi);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(mapping);
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
f2fs_balance_fs(sbi, dn.node_changed);
@@ -1545,6 +1542,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ struct address_space *mapping = inode->i_mapping;
pgoff_t nr, pg_start, pg_end, delta, idx;
loff_t new_size;
int ret = 0;
@@ -1567,14 +1565,14 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
f2fs_balance_fs(sbi, true);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(mapping);
ret = f2fs_truncate_blocks(inode, i_size_read(inode), true);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(mapping);
if (ret)
return ret;
/* write out all dirty pages from offset */
- ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
+ ret = filemap_write_and_wait_range(mapping, offset, LLONG_MAX);
if (ret)
return ret;
@@ -1585,7 +1583,7 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
/* avoid gc operation during block exchange */
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(mapping);
truncate_pagecache(inode, offset);
while (!ret && idx > pg_start) {
@@ -1601,14 +1599,14 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
idx + delta, nr, false);
f2fs_unlock_op(sbi);
}
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(mapping);
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
/* write out all moved pages, if possible */
- down_write(&F2FS_I(inode)->i_mmap_sem);
- filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
+ filemap_invalidate_lock(mapping);
+ filemap_write_and_wait_range(mapping, offset, LLONG_MAX);
truncate_pagecache(inode, offset);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(mapping);
if (!ret)
f2fs_i_size_write(inode, new_size);
@@ -3443,7 +3441,7 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
goto out;
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(inode->i_mapping);
last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
@@ -3479,7 +3477,7 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
}
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(inode->i_mapping);
out:
inode_unlock(inode);
@@ -3596,7 +3594,7 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
}
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(inode->i_mapping);
last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
@@ -3632,7 +3630,7 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
}
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(inode->i_mapping);
if (ret >= 0) {
F2FS_I(inode)->i_flags &= ~F2FS_IMMUTABLE_FL;
@@ -3752,7 +3750,7 @@ static int f2fs_sec_trim_file(struct file *filp, unsigned long arg)
goto err;
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(mapping);
ret = filemap_write_and_wait_range(mapping, range.start,
to_end ? LLONG_MAX : end_addr - 1);
@@ -3839,7 +3837,7 @@ static int f2fs_sec_trim_file(struct file *filp, unsigned long arg)
ret = f2fs_secure_erase(prev_bdev, inode, prev_index,
prev_block, len, range.flags);
out:
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(mapping);
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
err:
inode_unlock(inode);
@@ -4314,9 +4312,9 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
/* if we couldn't write data, we should deallocate blocks. */
if (preallocated && i_size_read(inode) < target_size) {
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
- down_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_lock(inode->i_mapping);
f2fs_truncate(inode);
- up_write(&F2FS_I(inode)->i_mmap_sem);
+ filemap_invalidate_unlock(inode->i_mapping);
up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 7d325bfaf65a..22e942aac7ad 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1187,7 +1187,6 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
mutex_init(&fi->inmem_lock);
init_rwsem(&fi->i_gc_rwsem[READ]);
init_rwsem(&fi->i_gc_rwsem[WRITE]);
- init_rwsem(&fi->i_mmap_sem);
init_rwsem(&fi->i_xattr_sem);
/* Will be used by directory only */
--
2.26.2
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