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ocfs2: allocate blocks in ocfs2_direct_IO_get_blocks 

Allow blocks allocation in ocfs2_direct_IO_get_blocks.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Weiwei Wang <wangww631@huawei.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Xuejiufei <xuejiufei@huawei.com>
Cc: alex chen <alex.chen@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joseph Qi 2015-02-16 16:00:03 -08:00 committed by Linus Torvalds
parent 24c40b329e
commit 49255dce65
1 changed files with 42 additions and 3 deletions
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45
fs/ocfs2/aops.c
View File

@ -510,18 +510,21 @@ bail:
*
* called like this: dio->get_blocks(dio->inode, fs_startblk,
* fs_count, map_bh, dio->rw == WRITE);
*
* Note that we never bother to allocate blocks here, and thus ignore the
* create argument.
*/
static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
int ret;
u32 cpos = 0;
int alloc_locked = 0;
u64 p_blkno, inode_blocks, contig_blocks;
unsigned int ext_flags;
unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
unsigned long len = bh_result->b_size;
unsigned int clusters_to_alloc = 0;
cpos = ocfs2_blocks_to_clusters(inode->i_sb, iblock);
/* This function won't even be called if the request isn't all
* nicely aligned and of the right size, so there's no need
@ -543,6 +546,40 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
/* We should already CoW the refcounted extent in case of create. */
BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED));
/* allocate blocks if no p_blkno is found, and create == 1 */
if (!p_blkno && create) {
ret = ocfs2_inode_lock(inode, NULL, 1);
if (ret < 0) {
mlog_errno(ret);
goto bail;
}
alloc_locked = 1;
/* fill hole, allocate blocks can't be larger than the size
* of the hole */
clusters_to_alloc = ocfs2_clusters_for_bytes(inode->i_sb, len);
if (clusters_to_alloc > contig_blocks)
clusters_to_alloc = contig_blocks;
/* allocate extent and insert them into the extent tree */
ret = ocfs2_extend_allocation(inode, cpos,
clusters_to_alloc, 0);
if (ret < 0) {
mlog_errno(ret);
goto bail;
}
ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
&contig_blocks, &ext_flags);
if (ret < 0) {
mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
(unsigned long long)iblock);
ret = -EIO;
goto bail;
}
}
/*
* get_more_blocks() expects us to describe a hole by clearing
* the mapped bit on bh_result().
@ -560,6 +597,8 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
contig_blocks = max_blocks;
bh_result->b_size = contig_blocks << blocksize_bits;
bail:
if (alloc_locked)
ocfs2_inode_unlock(inode, 1);
return ret;
}