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Message-Id: <20240816011342.1668666-1-chao@kernel.org>
Date: Fri, 16 Aug 2024 09:13:42 +0800
From: Chao Yu <chao@...nel.org>
To: jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org,
Chao Yu <chao@...nel.org>
Subject: [PATCH v2 4/4] f2fs: atomic: fix to forbid dio in atomic_file
atomic write can only be used via buffered IO, let's fail direct IO on
atomic_file and return -EOPNOTSUPP.
Signed-off-by: Chao Yu <chao@...nel.org>
---
v2:
- fix error path handling.
fs/f2fs/file.c | 36 ++++++++++++++++++++++++------------
1 file changed, 24 insertions(+), 12 deletions(-)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 6b4f417f3474..b50ebebbbaab 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2162,6 +2162,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
goto out;
f2fs_down_write(&fi->i_gc_rwsem[WRITE]);
+ f2fs_down_write(&fi->i_gc_rwsem[READ]);
/*
* Should wait end_io to count F2FS_WB_CP_DATA correctly by
@@ -2171,10 +2172,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
f2fs_warn(sbi, "Unexpected flush for atomic writes: ino=%lu, npages=%u",
inode->i_ino, get_dirty_pages(inode));
ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
- if (ret) {
- f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
- goto out;
- }
+ if (ret)
+ goto out_unlock;
/* Check if the inode already has a COW inode */
if (fi->cow_inode == NULL) {
@@ -2183,10 +2182,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
struct inode *dir = d_inode(dentry->d_parent);
ret = f2fs_get_tmpfile(idmap, dir, &fi->cow_inode);
- if (ret) {
- f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
- goto out;
- }
+ if (ret)
+ goto out_unlock;
set_inode_flag(fi->cow_inode, FI_COW_FILE);
clear_inode_flag(fi->cow_inode, FI_INLINE_DATA);
@@ -2200,10 +2197,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
invalidate_mapping_pages(fi->cow_inode->i_mapping, 0, -1);
ret = f2fs_do_truncate_blocks(fi->cow_inode, 0, true);
- if (ret) {
- f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
- goto out;
- }
+ if (ret)
+ goto out_unlock;
}
f2fs_write_inode(inode, NULL);
@@ -2222,7 +2217,11 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
}
f2fs_i_size_write(fi->cow_inode, isize);
+out_unlock:
+ f2fs_up_write(&fi->i_gc_rwsem[READ]);
f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
+ if (ret)
+ goto out;
f2fs_update_time(sbi, REQ_TIME);
fi->atomic_write_task = current;
@@ -4567,6 +4566,13 @@ static ssize_t f2fs_dio_read_iter(struct kiocb *iocb, struct iov_iter *to)
f2fs_down_read(&fi->i_gc_rwsem[READ]);
}
+ /* dio is not compatible w/ atomic file */
+ if (f2fs_is_atomic_file(inode)) {
+ f2fs_up_read(&fi->i_gc_rwsem[READ]);
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
/*
* We have to use __iomap_dio_rw() and iomap_dio_complete() instead of
* the higher-level function iomap_dio_rw() in order to ensure that the
@@ -4982,6 +4988,12 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
/* Determine whether we will do a direct write or a buffered write. */
dio = f2fs_should_use_dio(inode, iocb, from);
+ /* dio is not compatible w/ atomic write */
+ if (dio && f2fs_is_atomic_file(inode)) {
+ ret = -EOPNOTSUPP;
+ goto out_unlock;
+ }
+
/* Possibly preallocate the blocks for the write. */
target_size = iocb->ki_pos + iov_iter_count(from);
preallocated = f2fs_preallocate_blocks(iocb, from, dio);
--
2.40.1
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