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authorChao Yu <yuchao0@huawei.com>2019-09-27 13:01:35 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2019-10-04 23:32:32 +0300
commitfe1897eaa6646f5a64a4cee0e6473ed9887d324b (patch)
tree28aac9cc3953df67755ae28d22dde07aaed205fe /fs/f2fs
parentb145b0eb2031a620ca010174240963e4d2c6ce26 (diff)
downloadlinux-fe1897eaa6646f5a64a4cee0e6473ed9887d324b.tar.xz
f2fs: fix to update time in lazytime mode
generic/018 reports an inconsistent status of atime, the testcase is as below: - open file with O_SYNC - write file to construct fraged space - calc md5 of file - record {a,c,m}time - defrag file --- do nothing - umount & mount - check {a,c,m}time The root cause is, as f2fs enables lazytime by default, atime update will dirty vfs inode, rather than dirtying f2fs inode (by set with FI_DIRTY_INODE), so later f2fs_write_inode() called from VFS will fail to update inode page due to our skip: f2fs_write_inode() if (is_inode_flag_set(inode, FI_DIRTY_INODE)) return 0; So eventually, after evict(), we lose last atime for ever. To fix this issue, we need to check whether {a,c,m,cr}time is consistent in between inode cache and inode page, and only skip f2fs_update_inode() if f2fs inode is not dirty and time is consistent as well. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/f2fs.h23
-rw-r--r--fs/f2fs/inode.c6
2 files changed, 20 insertions, 9 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 4024790028aa..f078cd20dab8 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2704,6 +2704,20 @@ static inline void clear_file(struct inode *inode, int type)
f2fs_mark_inode_dirty_sync(inode, true);
}
+static inline bool f2fs_is_time_consistent(struct inode *inode)
+{
+ if (!timespec64_equal(F2FS_I(inode)->i_disk_time, &inode->i_atime))
+ return false;
+ if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 1, &inode->i_ctime))
+ return false;
+ if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 2, &inode->i_mtime))
+ return false;
+ if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 3,
+ &F2FS_I(inode)->i_crtime))
+ return false;
+ return true;
+}
+
static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
{
bool ret;
@@ -2721,14 +2735,7 @@ static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
i_size_read(inode) & ~PAGE_MASK)
return false;
- if (!timespec64_equal(F2FS_I(inode)->i_disk_time, &inode->i_atime))
- return false;
- if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 1, &inode->i_ctime))
- return false;
- if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 2, &inode->i_mtime))
- return false;
- if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 3,
- &F2FS_I(inode)->i_crtime))
+ if (!f2fs_is_time_consistent(inode))
return false;
down_read(&F2FS_I(inode)->i_sem);
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index db4fec30c30d..386ad54c13c3 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -615,7 +615,11 @@ int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc)
inode->i_ino == F2FS_META_INO(sbi))
return 0;
- if (!is_inode_flag_set(inode, FI_DIRTY_INODE))
+ /*
+ * atime could be updated without dirtying f2fs inode in lazytime mode
+ */
+ if (f2fs_is_time_consistent(inode) &&
+ !is_inode_flag_set(inode, FI_DIRTY_INODE))
return 0;
if (!f2fs_is_checkpoint_ready(sbi))