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vfs: add hooks for ext4's delayed allocation support

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Export mpage_bio_submit() and __mpage_writepage() for the benefit of
ext4's delayed allocation support.   Also change __block_write_full_page
so that if buffers that have the BH_Delay flag set it will call
get_block() to get the physical block allocated, just as in the
!BH_Mapped case.

Signed-off-by: Alex Tomas <alex@clusterfs.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Alex Tomas 2008-07-11 19:27:31 -04:00 • committed by Theodore Ts'o
parent 87c89c232c
commit 29a814d2ee
3 changed files with 20 additions and 11 deletions
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14
fs/mpage.c
View file

@ -82,7 +82,7 @@ static void mpage_end_io_write(struct bio *bio, int err)
bio_put(bio);
}
static struct bio *mpage_bio_submit(int rw, struct bio *bio)
struct bio *mpage_bio_submit(int rw, struct bio *bio)
{
bio->bi_end_io = mpage_end_io_read;
if (rw == WRITE)
@ -90,6 +90,7 @@ static struct bio *mpage_bio_submit(int rw, struct bio *bio)
submit_bio(rw, bio);
return NULL;
}
EXPORT_SYMBOL(mpage_bio_submit);
static struct bio *
mpage_alloc(struct block_device *bdev,
@ -435,15 +436,9 @@ EXPORT_SYMBOL(mpage_readpage);
* written, so it can intelligently allocate a suitably-sized BIO. For now,
* just allocate full-size (16-page) BIOs.
*/
struct mpage_data {
struct bio *bio;
sector_t last_block_in_bio;
get_block_t *get_block;
unsigned use_writepage;
};
static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
void *data)
int __mpage_writepage(struct page *page, struct writeback_control *wbc,
void *data)
{
struct mpage_data *mpd = data;
struct bio *bio = mpd->bio;
@ -651,6 +646,7 @@ out:
mpd->bio = bio;
return ret;
}
EXPORT_SYMBOL(__mpage_writepage);
/**
* mpage_writepages - walk the list of dirty pages of the given address space & writepage() all of them