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| author | Theodore Ts'o <tytso@mit.edu> | 2010-10-27 21:30:10 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-10-27 21:30:10 -0400 |
| commit | bd2d0210cf22f2bd0cef72eb97cf94fc7d31d8cc (patch) | |
| tree | f0d1902b7ff4294114614cc706855c3d6b131f73 /fs/ext4/ext4.h | |
| parent | 1de3e3df917459422cb2aecac440febc8879d410 (diff) | |
| download | kernel_samsung_smdk4412-bd2d0210cf22f2bd0cef72eb97cf94fc7d31d8cc.zip kernel_samsung_smdk4412-bd2d0210cf22f2bd0cef72eb97cf94fc7d31d8cc.tar.gz kernel_samsung_smdk4412-bd2d0210cf22f2bd0cef72eb97cf94fc7d31d8cc.tar.bz2 | |
ext4: use bio layer instead of buffer layer in mpage_da_submit_io
Call the block I/O layer directly instad of going through the buffer
layer. This should give us much better performance and scalability,
as well as lowering our CPU utilization when doing buffered writeback.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 2283369..ca9fda6 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -168,7 +168,20 @@ struct mpage_da_data { int pages_written; int retval; }; -#define EXT4_IO_UNWRITTEN 0x1 + +/* + * Flags for ext4_io_end->flags + */ +#define EXT4_IO_END_UNWRITTEN 0x0001 +#define EXT4_IO_END_ERROR 0x0002 + +struct ext4_io_page { + struct page *p_page; + int p_count; +}; + +#define MAX_IO_PAGES 128 + typedef struct ext4_io_end { struct list_head list; /* per-file finished IO list */ struct inode *inode; /* file being written to */ @@ -179,8 +192,18 @@ typedef struct ext4_io_end { struct work_struct work; /* data work queue */ struct kiocb *iocb; /* iocb struct for AIO */ int result; /* error value for AIO */ + int num_io_pages; + struct ext4_io_page *pages[MAX_IO_PAGES]; } ext4_io_end_t; +struct ext4_io_submit { + int io_op; + struct bio *io_bio; + ext4_io_end_t *io_end; + struct ext4_io_page *io_page; + sector_t io_next_block; +}; + /* * Special inodes numbers */ @@ -2044,6 +2067,17 @@ extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 start_orig, __u64 start_donor, __u64 len, __u64 *moved_len); +/* page-io.c */ +extern int __init init_ext4_pageio(void); +extern void exit_ext4_pageio(void); +extern void ext4_free_io_end(ext4_io_end_t *io); +extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); +extern int ext4_end_io_nolock(ext4_io_end_t *io); +extern void ext4_io_submit(struct ext4_io_submit *io); +extern int ext4_bio_write_page(struct ext4_io_submit *io, + struct page *page, + int len, + struct writeback_control *wbc); /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ enum ext4_state_bits { |