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| author | Mingming <cmm@us.ibm.com> | 2009-11-10 10:48:04 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-11-10 10:48:04 -0500 |
| commit | 5f5249507e4b5c4fc0f9c93f33d133d8c95f47e1 (patch) | |
| tree | 0b0a790f568c07298c3a4122572e84392c787648 /fs/ext4/extents.c | |
| parent | 109f55651954def97fa41ee71c464d268c512ab0 (diff) | |
| download | blackbird-op-linux-5f5249507e4b5c4fc0f9c93f33d133d8c95f47e1.tar.gz blackbird-op-linux-5f5249507e4b5c4fc0f9c93f33d133d8c95f47e1.zip | |
ext4: skip conversion of uninit extents after direct IO if there isn't any
At the end of direct I/O operation, ext4_ext_direct_IO() always called
ext4_convert_unwritten_extents(), regardless of whether there were any
unwritten extents involved in the I/O or not.
This commit adds a state flag so that ext4_ext_direct_IO() only calls
ext4_convert_unwritten_extents() when necessary.
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 441716f33b4a..e991ae2b461c 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3048,12 +3048,18 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode, ret = ext4_split_unwritten_extents(handle, inode, path, iblock, max_blocks, flags); - /* flag the io_end struct that we need convert when IO done */ + /* + * Flag the inode(non aio case) or end_io struct (aio case) + * that this IO needs to convertion to written when IO is + * completed + */ if (io) io->flag = DIO_AIO_UNWRITTEN; + else + EXT4_I(inode)->i_state |= EXT4_STATE_DIO_UNWRITTEN; goto out; } - /* DIO end_io complete, convert the filled extent to written */ + /* async DIO end_io complete, convert the filled extent to written */ if (flags == EXT4_GET_BLOCKS_DIO_CONVERT_EXT) { ret = ext4_convert_unwritten_extents_dio(handle, inode, path); @@ -3295,10 +3301,16 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, * To avoid unecessary convertion for every aio dio rewrite * to the mid of file, here we flag the IO that is really * need the convertion. - * + * For non asycn direct IO case, flag the inode state + * that we need to perform convertion when IO is done. */ - if (io && flags == EXT4_GET_BLOCKS_DIO_CREATE_EXT) - io->flag = DIO_AIO_UNWRITTEN; + if (flags == EXT4_GET_BLOCKS_DIO_CREATE_EXT) { + if (io) + io->flag = DIO_AIO_UNWRITTEN; + else + EXT4_I(inode)->i_state |= + EXT4_STATE_DIO_UNWRITTEN;; + } } err = ext4_ext_insert_extent(handle, inode, path, &newex, flags); if (err) { |
