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ext4: use bio layer instead of buffer layer in mpage_da_submit_io

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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>
This commit is contained in:
Theodore Ts'o
2010-10-27 21:30:10 -04:00
parent 1de3e3df91
commit bd2d0210cf
6 changed files with 489 additions and 109 deletions
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36
fs/ext4/ext4.h
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@@ -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 {