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f2fs: align direct_io'ed data to section

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This patch aligns the start block address of a file for direct io to the f2fs's
section size.

Some flash devices manage an over 4KB-sized page as a write unit, and if the
direct_io'ed data are written but not aligned to that unit, the performance can
be degraded due to the partial page copies.

Thus, since f2fs has a section that is well aligned to FTL units, we can align
the block address to the section size so that f2fs avoids this misalignment.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2015-01-05 16:02:20 -08:00
parent 41ef94b35c
commit 38aa0889b2
3 changed files with 26 additions and 11 deletions
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7
fs/f2fs/data.c
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@@ -564,6 +564,7 @@ static int __allocate_data_block(struct dnode_of_data *dn)
struct f2fs_inode_info *fi = F2FS_I(dn->inode);
struct f2fs_summary sum;
struct node_info ni;
int seg = CURSEG_WARM_DATA;
pgoff_t fofs;
if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
@@ -574,8 +575,10 @@ static int __allocate_data_block(struct dnode_of_data *dn)
get_node_info(sbi, dn->nid, &ni);
set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
allocate_data_block(sbi, NULL, NULL_ADDR, &dn->data_blkaddr, &sum,
CURSEG_WARM_DATA);
if (dn->ofs_in_node == 0 && dn->inode_page == dn->node_page)
seg = CURSEG_DIRECT_IO;
allocate_data_block(sbi, NULL, NULL_ADDR, &dn->data_blkaddr, &sum, seg);
/* direct IO doesn't use extent cache to maximize the performance */
__set_data_blkaddr(dn);