nilfs2: support nanosecond timestamp
After a review of user's feedback for finding out other compatibility
issues, I found nilfs improperly initializes timestamps in inode;
CURRENT_TIME was used there instead of CURRENT_TIME_SEC even though nilfs
didn't have nanosecond timestamps on disk. A few users gave us the report
that the tar program sometimes failed to expand symbolic links on nilfs,
and it turned out to be the cause.
Instead of applying the above displacement, I've decided to support
nanosecond timestamps on this occation. Fortunetaly, a needless 64-bit
field was in the nilfs_inode struct, and I found it's available for this
purpose without impact for the users.
So, this will do the enhancement and resolve the tar problem.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index 77615aa..19d2102 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -226,7 +226,6 @@
ii->i_flags = 0;
ii->i_state = 1 << NILFS_I_GCINODE;
ii->i_bh = NULL;
- ii->i_dtime = 0;
nilfs_bmap_init_gc(ii->i_bmap);
return inode;
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index a1922b1..49ab4a4 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -306,7 +306,6 @@
/* ii->i_file_acl = 0; */
/* ii->i_dir_acl = 0; */
- ii->i_dtime = 0;
ii->i_dir_start_lookup = 0;
#ifdef CONFIG_NILFS_FS_POSIX_ACL
ii->i_acl = NULL;
@@ -390,11 +389,10 @@
inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
- inode->i_atime.tv_nsec = 0;
- inode->i_ctime.tv_nsec = 0;
- inode->i_mtime.tv_nsec = 0;
- ii->i_dtime = le64_to_cpu(raw_inode->i_dtime);
- if (inode->i_nlink == 0 && (inode->i_mode == 0 || ii->i_dtime))
+ inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
+ inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
+ inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
+ if (inode->i_nlink == 0 && inode->i_mode == 0)
return -EINVAL; /* this inode is deleted */
inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
@@ -505,9 +503,10 @@
raw_inode->i_size = cpu_to_le64(inode->i_size);
raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
+ raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
+ raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
- raw_inode->i_dtime = cpu_to_le64(ii->i_dtime);
raw_inode->i_flags = cpu_to_le32(ii->i_flags);
raw_inode->i_generation = cpu_to_le32(inode->i_generation);
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index 19af5ab..7558c97 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -48,7 +48,6 @@
struct nilfs_bmap *i_bmap;
union nilfs_bmap_union i_bmap_union;
__u64 i_xattr; /* sector_t ??? */
- __u32 i_dtime;
__u32 i_dir_start_lookup;
__u64 i_cno; /* check point number for GC inode */
struct address_space i_btnode_cache;
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index e2ced82..e117e1e 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -792,6 +792,7 @@
sb->s_op = &nilfs_sops;
sb->s_export_op = &nilfs_export_ops;
sb->s_root = NULL;
+ sb->s_time_gran = 1;
if (!nilfs_loaded(nilfs)) {
err = load_nilfs(nilfs, sbi);
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index 1275b30..79fec6a 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -67,9 +67,10 @@
* struct nilfs_inode - structure of an inode on disk
* @i_blocks: blocks count
* @i_size: size in bytes
- * @i_ctime: creation time
- * @i_mtime: modification time
- * @i_dtime: deletion time
+ * @i_ctime: creation time (seconds)
+ * @i_mtime: modification time (seconds)
+ * @i_ctime_nsec: creation time (nano seconds)
+ * @i_mtime_nsec: modification time (nano seconds)
* @i_uid: user id
* @i_gid: group id
* @i_mode: file mode
@@ -85,7 +86,8 @@
__le64 i_size;
__le64 i_ctime;
__le64 i_mtime;
- __le64 i_dtime;
+ __le32 i_ctime_nsec;
+ __le32 i_mtime_nsec;
__le32 i_uid;
__le32 i_gid;
__le16 i_mode;