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f2fs: change i_compr_blocks of inode to atomic value

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writepages() can be concurrently invoked for the same file by different
threads such as a thread fsyncing the file and a kworker kernel thread.
So, changing i_compr_blocks without protection is racy and we need to
protect it by changing it with atomic type value. Plus, we don't need
a 64bit value for i_compr_blocks, so just we will use a atomic value,
not atomic64.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daeho Jeong 2020-09-08 11:44:10 +09:00 committed by Jaegeuk Kim
parent 32c0fec1aa
commit c2759ebaf7
4 changed files with 30 additions and 21 deletions
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17
fs/f2fs/f2fs.h
View File

@ -807,7 +807,7 @@ struct f2fs_inode_info {
struct timespec64 i_disk_time[4];/* inode disk times */
/* for file compress */
u64 i_compr_blocks; /* # of compressed blocks */
atomic_t i_compr_blocks; /* # of compressed blocks */
unsigned char i_compress_algorithm; /* algorithm type */
unsigned char i_log_cluster_size; /* log of cluster size */
unsigned int i_cluster_size; /* cluster size */
@ -3963,17 +3963,19 @@ static inline void set_compress_context(struct inode *inode)
f2fs_mark_inode_dirty_sync(inode, true);
}
static inline u64 f2fs_disable_compressed_file(struct inode *inode)
static inline u32 f2fs_disable_compressed_file(struct inode *inode)
{
struct f2fs_inode_info *fi = F2FS_I(inode);
u32 i_compr_blocks;
if (!f2fs_compressed_file(inode))
return 0;
if (S_ISREG(inode->i_mode)) {
if (get_dirty_pages(inode))
return 1;
if (fi->i_compr_blocks)
return fi->i_compr_blocks;
i_compr_blocks = atomic_read(&fi->i_compr_blocks);
if (i_compr_blocks)
return i_compr_blocks;
}
fi->i_flags &= ~F2FS_COMPR_FL;
@ -4090,16 +4092,17 @@ static inline void f2fs_i_compr_blocks_update(struct inode *inode,
u64 blocks, bool add)
{
int diff = F2FS_I(inode)->i_cluster_size - blocks;
struct f2fs_inode_info *fi = F2FS_I(inode);
/* don't update i_compr_blocks if saved blocks were released */
if (!add && !F2FS_I(inode)->i_compr_blocks)
if (!add && !atomic_read(&fi->i_compr_blocks))
return;
if (add) {
F2FS_I(inode)->i_compr_blocks += diff;
atomic_add(diff, &fi->i_compr_blocks);
stat_add_compr_blocks(inode, diff);
} else {
F2FS_I(inode)->i_compr_blocks -= diff;
atomic_sub(diff, &fi->i_compr_blocks);
stat_sub_compr_blocks(inode, diff);
}
f2fs_mark_inode_dirty_sync(inode, true);

22
fs/f2fs/file.c
View File

@ -545,7 +545,7 @@ void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
bool compressed_cluster = false;
int cluster_index = 0, valid_blocks = 0;
int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
bool released = !F2FS_I(dn->inode)->i_compr_blocks;
bool released = !atomic_read(&F2FS_I(dn->inode)->i_compr_blocks);
if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
base = get_extra_isize(dn->inode);
@ -3424,7 +3424,7 @@ static int f2fs_get_compress_blocks(struct file *filp, unsigned long arg)
if (!f2fs_compressed_file(inode))
return -EINVAL;
blocks = F2FS_I(inode)->i_compr_blocks;
blocks = atomic_read(&F2FS_I(inode)->i_compr_blocks);
return put_user(blocks, (u64 __user *)arg);
}
@ -3528,7 +3528,7 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
inode->i_ctime = current_time(inode);
f2fs_mark_inode_dirty_sync(inode, true);
if (!F2FS_I(inode)->i_compr_blocks)
if (!atomic_read(&F2FS_I(inode)->i_compr_blocks))
goto out;
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
@ -3576,14 +3576,15 @@ out:
if (ret >= 0) {
ret = put_user(released_blocks, (u64 __user *)arg);
} else if (released_blocks && F2FS_I(inode)->i_compr_blocks) {
} else if (released_blocks &&
atomic_read(&F2FS_I(inode)->i_compr_blocks)) {
set_sbi_flag(sbi, SBI_NEED_FSCK);
f2fs_warn(sbi, "%s: partial blocks were released i_ino=%lx "
"iblocks=%llu, released=%u, compr_blocks=%llu, "
"iblocks=%llu, released=%u, compr_blocks=%u, "
"run fsck to fix.",
__func__, inode->i_ino, inode->i_blocks,
released_blocks,
F2FS_I(inode)->i_compr_blocks);
atomic_read(&F2FS_I(inode)->i_compr_blocks));
}
return ret;
@ -3671,7 +3672,7 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
if (ret)
return ret;
if (F2FS_I(inode)->i_compr_blocks)
if (atomic_read(&F2FS_I(inode)->i_compr_blocks))
goto out;
f2fs_balance_fs(F2FS_I_SB(inode), true);
@ -3735,14 +3736,15 @@ out:
if (ret >= 0) {
ret = put_user(reserved_blocks, (u64 __user *)arg);
} else if (reserved_blocks && F2FS_I(inode)->i_compr_blocks) {
} else if (reserved_blocks &&
atomic_read(&F2FS_I(inode)->i_compr_blocks)) {
set_sbi_flag(sbi, SBI_NEED_FSCK);
f2fs_warn(sbi, "%s: partial blocks were released i_ino=%lx "
"iblocks=%llu, reserved=%u, compr_blocks=%llu, "
"iblocks=%llu, reserved=%u, compr_blocks=%u, "
"run fsck to fix.",
__func__, inode->i_ino, inode->i_blocks,
reserved_blocks,
F2FS_I(inode)->i_compr_blocks);
atomic_read(&F2FS_I(inode)->i_compr_blocks));
}
return ret;

11
fs/f2fs/inode.c
View File

@ -442,7 +442,8 @@ static int do_read_inode(struct inode *inode)
(fi->i_flags & F2FS_COMPR_FL)) {
if (F2FS_FITS_IN_INODE(ri, fi->i_extra_isize,
i_log_cluster_size)) {
fi->i_compr_blocks = le64_to_cpu(ri->i_compr_blocks);
atomic_set(&fi->i_compr_blocks,
le64_to_cpu(ri->i_compr_blocks));
fi->i_compress_algorithm = ri->i_compress_algorithm;
fi->i_log_cluster_size = ri->i_log_cluster_size;
fi->i_cluster_size = 1 << fi->i_log_cluster_size;
@ -460,7 +461,7 @@ static int do_read_inode(struct inode *inode)
stat_inc_inline_inode(inode);
stat_inc_inline_dir(inode);
stat_inc_compr_inode(inode);
stat_add_compr_blocks(inode, F2FS_I(inode)->i_compr_blocks);
stat_add_compr_blocks(inode, atomic_read(&fi->i_compr_blocks));
return 0;
}
@ -619,7 +620,8 @@ void f2fs_update_inode(struct inode *inode, struct page *node_page)
F2FS_FITS_IN_INODE(ri, F2FS_I(inode)->i_extra_isize,
i_log_cluster_size)) {
ri->i_compr_blocks =
cpu_to_le64(F2FS_I(inode)->i_compr_blocks);
cpu_to_le64(atomic_read(
&F2FS_I(inode)->i_compr_blocks));
ri->i_compress_algorithm =
F2FS_I(inode)->i_compress_algorithm;
ri->i_log_cluster_size =
@ -768,7 +770,8 @@ no_delete:
stat_dec_inline_dir(inode);
stat_dec_inline_inode(inode);
stat_dec_compr_inode(inode);
stat_sub_compr_blocks(inode, F2FS_I(inode)->i_compr_blocks);
stat_sub_compr_blocks(inode,
atomic_read(&F2FS_I(inode)->i_compr_blocks));
if (likely(!f2fs_cp_error(sbi) &&
!is_sbi_flag_set(sbi, SBI_CP_DISABLED)))

1
fs/f2fs/super.c
View File

@ -1026,6 +1026,7 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
/* Initialize f2fs-specific inode info */
atomic_set(&fi->dirty_pages, 0);
atomic_set(&fi->i_compr_blocks, 0);
init_rwsem(&fi->i_sem);
spin_lock_init(&fi->i_size_lock);
INIT_LIST_HEAD(&fi->dirty_list);