diff options
| -rw-r--r-- | fs/ext4/file.c | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 3736d9dfe32..7d55a591deb 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -107,16 +107,36 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov, BUG_ON(iocb->ki_pos != pos); /* + * Unaligned direct AIO must be serialized; see comment above + * In the case of O_APPEND, assume that we must always serialize + */ + if (o_direct && + ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) && + !is_sync_kiocb(iocb) && + (file->f_flags & O_APPEND || + ext4_unaligned_aio(inode, iov, nr_segs, pos))) { + aio_mutex = ext4_aio_mutex(inode); + mutex_lock(aio_mutex); + ext4_unwritten_wait(inode); + } + + mutex_lock(&inode->i_mutex); + if (file->f_flags & O_APPEND) + iocb->ki_pos = pos = i_size_read(inode); + + /* * If we have encountered a bitmap-format file, the size limit * is smaller than s_maxbytes, which is for extent-mapped files. */ - if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); - if ((pos > sbi->s_bitmap_maxbytes || - (pos == sbi->s_bitmap_maxbytes && length > 0))) - return -EFBIG; + if ((pos > sbi->s_bitmap_maxbytes) || + (pos == sbi->s_bitmap_maxbytes && length > 0)) { + mutex_unlock(&inode->i_mutex); + ret = -EFBIG; + goto errout; + } if (pos + length > sbi->s_bitmap_maxbytes) { nr_segs = iov_shorten((struct iovec *)iov, nr_segs, @@ -125,16 +145,6 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov, } if (o_direct) { - /* Unaligned direct AIO must be serialized; see comment above */ - if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) && - !is_sync_kiocb(iocb) && - ext4_unaligned_aio(inode, iov, nr_segs, pos)) { - aio_mutex = ext4_aio_mutex(inode); - mutex_lock(aio_mutex); - ext4_unwritten_wait(inode); - } - - mutex_lock(&inode->i_mutex); blk_start_plug(&plug); iocb->private = &overwrite; @@ -167,8 +177,7 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov, if (err == len && (map.m_flags & EXT4_MAP_MAPPED)) overwrite = 1; } - } else - mutex_lock(&inode->i_mutex); + } ret = __generic_file_aio_write(iocb, iov, nr_segs); mutex_unlock(&inode->i_mutex); @@ -183,6 +192,7 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov, if (o_direct) blk_finish_plug(&plug); +errout: if (aio_mutex) mutex_unlock(aio_mutex); return ret; |