From: Aneesh Kumar K.V Date: Wed, 20 Aug 2008 02:16:43 +0000 (-0400) Subject: ext4: Handle unwritten extent properly with delayed allocation X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bf068ee266f9dbaa6dacb8433a366bb399e7ae5b;p=linux-2.6 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 Signed-off-by: Mingming Cao Signed-off-by: "Theodore Ts'o" --- diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 59fbbe899a..a1c7d76232 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -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