exfat: write multiple sectors at once

Write multiple sectors at once when updating dir-entries.
Add exfat_update_bhs() for that. It wait for write completion once
instead of sector by sector.
It's only effective if sync enabled.

Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>

diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index 97296bc..542f1a5 100644 (file)
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -606,13 +606,16 @@ void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es)
 
 void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
 {
-       int i;
+       int i, err = 0;
 
-       for (i = 0; i < es->num_bh; i++) {
-               if (es->modified)
-                       exfat_update_bh(es->bh[i], sync);
-               brelse(es->bh[i]);
-       }
+       if (es->modified)
+               err = exfat_update_bhs(es->bh, es->num_bh, sync);
+
+       for (i = 0; i < es->num_bh; i++)
+               if (err)
+                       bforget(es->bh[i]);
+               else
+                       brelse(es->bh[i]);
        kfree(es);
 }
 

diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index 05553b2..af0f526 100644 (file)
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -513,6 +513,7 @@ void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type);
 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type);
 void exfat_update_bh(struct buffer_head *bh, int sync);
+int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync);
 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
                unsigned int size, unsigned char flags);
 void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec);

diff --git a/fs/exfat/misc.c b/fs/exfat/misc.c
index 8a3dde5..d34e619 100644 (file)
--- a/fs/exfat/misc.c
+++ b/fs/exfat/misc.c
@@ -172,6 +172,25 @@ void exfat_update_bh(struct buffer_head *bh, int sync)
                sync_dirty_buffer(bh);
 }
 
+int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync)
+{
+       int i, err = 0;
+
+       for (i = 0; i < nr_bhs; i++) {
+               set_buffer_uptodate(bhs[i]);
+               mark_buffer_dirty(bhs[i]);
+               if (sync)
+                       write_dirty_buffer(bhs[i], 0);
+       }
+
+       for (i = 0; i < nr_bhs && sync; i++) {
+               wait_on_buffer(bhs[i]);
+               if (!err && !buffer_uptodate(bhs[i]))
+                       err = -EIO;
+       }
+       return err;
+}
+
 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
                unsigned int size, unsigned char flags)
 {