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f2fs: don't grab super block buffer header all the time

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We have already got one copy of valid super block in memory, do not grab
buffer header of super block all the time.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2015-12-15 17:19:26 +08:00 committed by Jaegeuk Kim
parent b39f0de23d
commit e8240f656d
3 changed files with 39 additions and 54 deletions
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2
fs/f2fs/f2fs.h
View File

@ -715,8 +715,8 @@ enum {
struct f2fs_sb_info {
struct super_block *sb; /* pointer to VFS super block */
struct proc_dir_entry *s_proc; /* proc entry */
struct buffer_head *raw_super_buf; /* buffer head of raw sb */
struct f2fs_super_block *raw_super; /* raw super block pointer */
int valid_super_block; /* valid super block no */
int s_flag; /* flags for sbi */
/* for node-related operations */

8
fs/f2fs/file.c
View File

@ -1591,20 +1591,16 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
return err;
/* update superblock with uuid */
lock_buffer(sbi->raw_super_buf);
generate_random_uuid(sbi->raw_super->encrypt_pw_salt);
unlock_buffer(sbi->raw_super_buf);
err = f2fs_commit_super(sbi, false);
mnt_drop_write_file(filp);
if (err) {
/* undo new data */
lock_buffer(sbi->raw_super_buf);
memset(sbi->raw_super->encrypt_pw_salt, 0, 16);
unlock_buffer(sbi->raw_super_buf);
mnt_drop_write_file(filp);
return err;
}
mnt_drop_write_file(filp);
got_it:
if (copy_to_user((__u8 __user *)arg, sbi->raw_super->encrypt_pw_salt,
16))

83
fs/f2fs/super.c
View File

@ -567,7 +567,6 @@ static void f2fs_put_super(struct super_block *sb)
wait_for_completion(&sbi->s_kobj_unregister);
sb->s_fs_info = NULL;
brelse(sbi->raw_super_buf);
kfree(sbi->raw_super);
kfree(sbi);
}
@ -1132,65 +1131,53 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
*/
static int read_raw_super_block(struct super_block *sb,
struct f2fs_super_block **raw_super,
struct buffer_head **raw_super_buf,
int *recovery)
int *valid_super_block, int *recovery)
{
int block = 0;
struct buffer_head *buffer;
struct f2fs_super_block *super;
struct buffer_head *bh;
struct f2fs_super_block *super, *buf;
int err = 0;
super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL);
if (!super)
return -ENOMEM;
retry:
buffer = sb_bread(sb, block);
if (!buffer) {
bh = sb_bread(sb, block);
if (!bh) {
*recovery = 1;
f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
block + 1);
if (block == 0) {
block++;
goto retry;
} else {
err = -EIO;
goto out;
}
err = -EIO;
goto next;
}
memcpy(super, buffer->b_data + F2FS_SUPER_OFFSET, sizeof(*super));
buf = (struct f2fs_super_block *)(bh->b_data + F2FS_SUPER_OFFSET);
/* sanity checking of raw super */
if (sanity_check_raw_super(sb, super)) {
brelse(buffer);
if (sanity_check_raw_super(sb, buf)) {
brelse(bh);
*recovery = 1;
f2fs_msg(sb, KERN_ERR,
"Can't find valid F2FS filesystem in %dth superblock",
block + 1);
if (block == 0) {
block++;
goto retry;
} else {
err = -EINVAL;
goto out;
}
err = -EINVAL;
goto next;
}
if (!*raw_super) {
*raw_super_buf = buffer;
memcpy(super, buf, sizeof(*super));
*valid_super_block = block;
*raw_super = super;
} else {
/* already have a valid superblock */
brelse(buffer);
}
brelse(bh);
next:
/* check the validity of the second superblock */
if (block == 0) {
block++;
goto retry;
}
out:
/* No valid superblock */
if (!*raw_super) {
kfree(super);
@ -1203,18 +1190,16 @@ out:
int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
{
struct f2fs_super_block *super = F2FS_RAW_SUPER(sbi);
struct buffer_head *sbh = sbi->raw_super_buf;
struct buffer_head *bh;
int err;
/* write back-up superblock first */
bh = sb_getblk(sbi->sb, sbh->b_blocknr ? 0 : 1);
bh = sb_getblk(sbi->sb, sbi->valid_super_block ? 0 : 1);
if (!bh)
return -EIO;
lock_buffer(bh);
memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
WARN_ON(sbh->b_size != F2FS_BLKSIZE);
set_buffer_uptodate(bh);
set_buffer_dirty(bh);
unlock_buffer(bh);
@ -1227,33 +1212,37 @@ int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
if (recover || err)
return err;
/* write current valid superblock */
lock_buffer(sbh);
if (memcmp(sbh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super))) {
f2fs_msg(sbi->sb, KERN_INFO, "Write modified valid superblock");
memcpy(sbh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
}
set_buffer_dirty(sbh);
unlock_buffer(sbh);
bh = sb_getblk(sbi->sb, sbi->valid_super_block);
if (!bh)
return -EIO;
return __sync_dirty_buffer(sbh, WRITE_FLUSH_FUA);
/* write current valid superblock */
lock_buffer(bh);
memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
set_buffer_uptodate(bh);
set_buffer_dirty(bh);
unlock_buffer(bh);
err = __sync_dirty_buffer(bh, WRITE_FLUSH_FUA);
brelse(bh);
return err;
}
static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
{
struct f2fs_sb_info *sbi;
struct f2fs_super_block *raw_super;
struct buffer_head *raw_super_buf;
struct inode *root;
long err;
bool retry = true, need_fsck = false;
char *options = NULL;
int recovery, i;
int recovery, i, valid_super_block;
try_onemore:
err = -EINVAL;
raw_super = NULL;
raw_super_buf = NULL;
valid_super_block = -1;
recovery = 0;
/* allocate memory for f2fs-specific super block info */
@ -1267,7 +1256,8 @@ try_onemore:
goto free_sbi;
}
err = read_raw_super_block(sb, &raw_super, &raw_super_buf, &recovery);
err = read_raw_super_block(sb, &raw_super, &valid_super_block,
&recovery);
if (err)
goto free_sbi;
@ -1300,7 +1290,7 @@ try_onemore:
/* init f2fs-specific super block info */
sbi->sb = sb;
sbi->raw_super = raw_super;
sbi->raw_super_buf = raw_super_buf;
sbi->valid_super_block = valid_super_block;
mutex_init(&sbi->gc_mutex);
mutex_init(&sbi->writepages);
mutex_init(&sbi->cp_mutex);
@ -1506,7 +1496,6 @@ free_meta_inode:
free_options:
kfree(options);
free_sb_buf:
brelse(raw_super_buf);
kfree(raw_super);
free_sbi:
kfree(sbi);