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block: separate priority boosting from REQ_META

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Add a new REQ_PRIO to let requests preempt others in the cfq I/O schedule,
and lave REQ_META purely for marking requests as metadata in blktrace.

All existing callers of REQ_META except for XFS are updated to also
set REQ_PRIO for now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Christoph Hellwig
2011-08-23 14:50:29 +02:00
committed by Jens Axboe
parent 5dc06c5a70
commit 65299a3b78
11 changed files with 32 additions and 25 deletions
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4
fs/ext3/inode.c
View File

@@ -1134,7 +1134,7 @@ struct buffer_head *ext3_bread(handle_t *handle, struct inode *inode,
return bh;
if (buffer_uptodate(bh))
return bh;
ll_rw_block(READ | REQ_META, 1, &bh);
ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &bh);
wait_on_buffer(bh);
if (buffer_uptodate(bh))
return bh;
@@ -2807,7 +2807,7 @@ make_io:
trace_ext3_load_inode(inode);
get_bh(bh);
bh->b_end_io = end_buffer_read_sync;
submit_bh(READ | REQ_META, bh);
submit_bh(READ | REQ_META | REQ_PRIO, bh);
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
ext3_error(inode->i_sb, "ext3_get_inode_loc",

3
fs/ext3/namei.c
View File

@@ -922,7 +922,8 @@ restart:
bh = ext3_getblk(NULL, dir, b++, 0, &err);
bh_use[ra_max] = bh;
if (bh)
ll_rw_block(READ | REQ_META, 1, &bh);
ll_rw_block(READ | REQ_META | REQ_PRIO,
1, &bh);
}
}
if ((bh = bh_use[ra_ptr++]) == NULL)