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| author | Zheng Liu <wenqing.lz@taobao.com> | 2012-07-10 00:29:29 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-07-10 00:29:29 +0400 |
| commit | fbe104942d3ff44f6802e8e4a3fbf267c1fb9ac4 (patch) | |
| tree | 1022097e97679f5fc13fdef5fd5893cdfdd35dcf /fs/ext4 | |
| parent | 62a1391ddd6fbe82fc02154dc760bcc5cbc9ef68 (diff) | |
| download | linux-fbe104942d3ff44f6802e8e4a3fbf267c1fb9ac4.tar.xz | |
ext4: split ext4_file_write into buffered IO and direct IO
ext4_file_dio_write is defined in order to split buffered IO and
direct IO in ext4. This patch just refactor some stuff in write path.
CC: Tao Ma <tm@tao.ma>
CC: Eric Sandeen <sandeen@redhat.com>
CC: Robin Dong <hao.bigrat@gmail.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/file.c | 60 |
1 files changed, 38 insertions, 22 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 8c7642a00054..a10dc7742aec 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -90,34 +90,16 @@ ext4_unaligned_aio(struct inode *inode, const struct iovec *iov, } static ssize_t -ext4_file_write(struct kiocb *iocb, const struct iovec *iov, - unsigned long nr_segs, loff_t pos) +ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov, + unsigned long nr_segs, loff_t pos) { struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; int unaligned_aio = 0; ssize_t ret; - /* - * 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); - size_t length = iov_length(iov, nr_segs); - - if ((pos > sbi->s_bitmap_maxbytes || - (pos == sbi->s_bitmap_maxbytes && length > 0))) - return -EFBIG; - - if (pos + length > sbi->s_bitmap_maxbytes) { - nr_segs = iov_shorten((struct iovec *)iov, nr_segs, - sbi->s_bitmap_maxbytes - pos); - } - } else if (unlikely((iocb->ki_filp->f_flags & O_DIRECT) && - !is_sync_kiocb(iocb))) { + if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) && + !is_sync_kiocb(iocb)) unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos); - } /* Unaligned direct AIO must be serialized; see comment above */ if (unaligned_aio) { @@ -141,6 +123,40 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov, return ret; } +static ssize_t +ext4_file_write(struct kiocb *iocb, const struct iovec *iov, + unsigned long nr_segs, loff_t pos) +{ + struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; + ssize_t ret; + + /* + * 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); + size_t length = iov_length(iov, nr_segs); + + if ((pos > sbi->s_bitmap_maxbytes || + (pos == sbi->s_bitmap_maxbytes && length > 0))) + return -EFBIG; + + if (pos + length > sbi->s_bitmap_maxbytes) { + nr_segs = iov_shorten((struct iovec *)iov, nr_segs, + sbi->s_bitmap_maxbytes - pos); + } + } + + if (unlikely(iocb->ki_filp->f_flags & O_DIRECT)) + ret = ext4_file_dio_write(iocb, iov, nr_segs, pos); + else + ret = generic_file_aio_write(iocb, iov, nr_segs, pos); + + return ret; +} + static const struct vm_operations_struct ext4_file_vm_ops = { .fault = filemap_fault, .page_mkwrite = ext4_page_mkwrite, |