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ext4: Handle unwritten extent properly with delayed allocation 

When using fallocate the buffer_heads are marked unwritten and unmapped.
We need to map them in the writepages after a get_block.  Otherwise we
split the uninit extents, but never write the content to disk.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Aneesh Kumar K.V 2008-08-19 22:16:43 -04:00 committed by Theodore Ts'o
parent 30a2f3c60a
commit bf068ee266
1 changed files with 10 additions and 2 deletions
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12
fs/ext4/inode.c
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@ -1741,6 +1741,13 @@ static void mpage_put_bnr_to_bhs(struct mpage_da_data *mpd, sector_t logical,
if (buffer_delay(bh)) {
bh->b_blocknr = pblock;
clear_buffer_delay(bh);
bh->b_bdev = inode->i_sb->s_bdev;
} else if (buffer_unwritten(bh)) {
bh->b_blocknr = pblock;
clear_buffer_unwritten(bh);
set_buffer_mapped(bh);
set_buffer_new(bh);
bh->b_bdev = inode->i_sb->s_bdev;
} else if (buffer_mapped(bh))
BUG_ON(bh->b_blocknr != pblock);
@ -1814,7 +1821,7 @@ static void mpage_da_map_blocks(struct mpage_da_data *mpd)
* If blocks are delayed marked, we need to
* put actual blocknr and drop delayed bit
*/
if (buffer_delay(lbh))
if (buffer_delay(lbh) || buffer_unwritten(lbh))
mpage_put_bnr_to_bhs(mpd, next, &new);
/* go for the remaining blocks */
@ -1823,7 +1830,8 @@ static void mpage_da_map_blocks(struct mpage_da_data *mpd)
}
}
#define BH_FLAGS ((1 << BH_Uptodate) | (1 << BH_Mapped) | (1 << BH_Delay))
#define BH_FLAGS ((1 << BH_Uptodate) | (1 << BH_Mapped) | \
(1 << BH_Delay) | (1 << BH_Unwritten))
/*
* mpage_add_bh_to_extent - try to add one more block to extent of blocks