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JFS: clear PAGECACHE_TAG_DIRTY for no-write pages 

When JFS decides to drop a dirty metapage, it simply clears the META_dirty
bit and leave alone the PG_dirty and PAGECACHE_TAG_DIRTY bits.

When such no-write page goes to metapage_writepage(), the `relic'
PAGECACHE_TAG_DIRTY tag should be cleared, to prevent pdflush from
repeatedly trying to sync them.  This is done through
set_page_writeback(), so call it should be called in all cases.  If
no I/O is initiated, end_page_writeback() should be called immediately.

This is how __block_write_full_page() does things.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
CC: Fengguang Wu <wfg@mail.ustc.edu.cn>
This commit is contained in:
Dave Kleikamp 2008-01-03 13:09:33 -06:00
parent b8c9a18712
commit 29a424f283
1 changed files with 8 additions and 3 deletions
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11
fs/jfs/jfs_metapage.c
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@ -360,6 +360,7 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
struct metapage *mp;
int redirty = 0;
sector_t lblock;
int nr_underway = 0;
sector_t pblock;
sector_t next_block = 0;
sector_t page_start;
@ -371,6 +372,7 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
(PAGE_CACHE_SHIFT - inode->i_blkbits);
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
set_page_writeback(page);
for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) {
mp = page_to_mp(page, offset);
@ -413,11 +415,10 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
if (!bio->bi_size)
goto dump_bio;
submit_bio(WRITE, bio);
nr_underway++;
bio = NULL;
} else {
set_page_writeback(page);
} else
inc_io(page);
}
xlen = (PAGE_CACHE_SIZE - offset) >> inode->i_blkbits;
pblock = metapage_get_blocks(inode, lblock, &xlen);
if (!pblock) {
@ -449,12 +450,16 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
goto dump_bio;
submit_bio(WRITE, bio);
nr_underway++;
}
if (redirty)
redirty_page_for_writepage(wbc, page);
unlock_page(page);
if (nr_underway == 0)
end_page_writeback(page);
return 0;
add_failed:
/* We should never reach here, since we're only adding one vec */