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f2fs: allocate data blocks in advance for f2fs_direct_IO 

This patch adds preallocation for data blocks to prepare f2fs_direct_IO.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-02-09 12:09:53 -08:00
parent f7ef9b83b5
commit 59b802e5a4
1 changed files with 54 additions and 3 deletions
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57
fs/f2fs/data.c
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@ -592,6 +592,56 @@ static int __allocate_data_block(struct dnode_of_data *dn)
return 0;
}
static void __allocate_data_blocks(struct inode *inode, loff_t offset,
size_t count)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct dnode_of_data dn;
u64 start = F2FS_BYTES_TO_BLK(offset);
u64 len = F2FS_BYTES_TO_BLK(count);
bool allocated;
u64 end_offset;
while (len) {
f2fs_balance_fs(sbi);
f2fs_lock_op(sbi);
/* When reading holes, we need its node page */
set_new_dnode(&dn, inode, NULL, NULL, 0);
if (get_dnode_of_data(&dn, start, ALLOC_NODE))
goto out;
allocated = false;
end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
while (dn.ofs_in_node < end_offset && len) {
if (dn.data_blkaddr == NULL_ADDR) {
if (__allocate_data_block(&dn))
goto sync_out;
allocated = true;
}
len--;
start++;
dn.ofs_in_node++;
}
if (allocated)
sync_inode_page(&dn);
f2fs_put_dnode(&dn);
f2fs_unlock_op(sbi);
}
return;
sync_out:
if (allocated)
sync_inode_page(&dn);
f2fs_put_dnode(&dn);
out:
f2fs_unlock_op(sbi);
return;
}
/*
* get_data_block() now supported readahead/bmap/rw direct_IO with mapped bh.
* If original data blocks are allocated, then give them to blockdev.
@ -617,10 +667,8 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
if (check_extent_cache(inode, pgofs, bh_result))
goto out;
if (create) {
f2fs_balance_fs(F2FS_I_SB(inode));
if (create)
f2fs_lock_op(F2FS_I_SB(inode));
}
/* When reading holes, we need its node page */
set_new_dnode(&dn, inode, NULL, NULL, 0);
@ -1108,6 +1156,9 @@ static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
trace_f2fs_direct_IO_enter(inode, offset, count, rw);
if (rw & WRITE)
__allocate_data_blocks(inode, offset, count);
err = blockdev_direct_IO(rw, iocb, inode, iter, offset, get_data_block);
if (err < 0 && (rw & WRITE))
f2fs_write_failed(mapping, offset + count);