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mirror O_APPEND and O_DIRECT into iocb->ki_flags

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... avoiding write_iter/fcntl races.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2015-04-09 13:52:01 -04:00
parent 3309dd04cb
commit 2ba48ce513
11 changed files with 38 additions and 23 deletions
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4
fs/ext4/file.c
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@@ -95,7 +95,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct inode *inode = file_inode(iocb->ki_filp);
struct mutex *aio_mutex = NULL;
struct blk_plug plug;
int o_direct = io_is_direct(file);
int o_direct = iocb->ki_flags & IOCB_DIRECT;
int overwrite = 0;
ssize_t ret;
@@ -106,7 +106,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (o_direct &&
ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
!is_sync_kiocb(iocb) &&
(file->f_flags & O_APPEND ||
(iocb->ki_flags & IOCB_APPEND ||
ext4_unaligned_aio(inode, from, iocb->ki_pos))) {
aio_mutex = ext4_aio_mutex(inode);
mutex_lock(aio_mutex);