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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-05-25 02:47:14 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-06-10 23:41:12 +0900
commitc3a7abf06ce719a51139e62a034590be99abbc2c (patch)
tree14d61bbd8c34d1b1c7997c9afad79158b7af2914 /fs/nilfs2/inode.c
parentfa032744ad41de1b0a1807e7c379c6196e72ad80 (diff)
downloadop-kernel-dev-c3a7abf06ce719a51139e62a034590be99abbc2c.zip
op-kernel-dev-c3a7abf06ce719a51139e62a034590be99abbc2c.tar.gz
nilfs2: support contiguous lookup of blocks
Although get_block() callback function can return extent of contiguous blocks with bh->b_size, nilfs_get_block() function did not support this feature. This adds contiguous lookup feature to the block mapping codes of nilfs, and allows the nilfs_get_blocks() function to return the extent information by applying the feature. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/inode.c')
-rw-r--r--fs/nilfs2/inode.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index f25fd4b..2696d6b 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -43,22 +43,23 @@
*
* This function does not issue actual read request of the specified data
* block. It is done by VFS.
- * Bulk read for direct-io is not supported yet. (should be supported)
*/
int nilfs_get_block(struct inode *inode, sector_t blkoff,
struct buffer_head *bh_result, int create)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
- unsigned long blknum = 0;
+ __u64 blknum = 0;
int err = 0, ret;
struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode));
+ unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
- /* This exclusion control is a workaround; should be revised */
- down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
- ret = nilfs_bmap_lookup(ii->i_bmap, (unsigned long)blkoff, &blknum);
- up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
- if (ret == 0) { /* found */
+ down_read(&NILFS_MDT(dat)->mi_sem);
+ ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
+ up_read(&NILFS_MDT(dat)->mi_sem);
+ if (ret >= 0) { /* found */
map_bh(bh_result, inode->i_sb, blknum);
+ if (ret > 0)
+ bh_result->b_size = (ret << inode->i_blkbits);
goto out;
}
/* data block was not found */
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