[PATCH-v2 1/5] fs: split update_time() into update_time() and write_time()

Theodore Ts'o
2014-11-22T16:54:39Z

In preparation for adding support for the lazytime mount option, we
need to be able to separate out the update_time() and write_time()
inode operations. Currently, only btrfs and xfs uses update_time().

We needed to preserve update_time() because btrfs wants to have a
special btrfs_root_readonly() check; otherwise we could drop the
update_time() inode operation entirely.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: xfs@oss.sgi.com
Cc: linux-btrfs@vger.kernel.org
---
fs/btrfs/inode.c | 10 ++++++++++
fs/inode.c | 29 ++++++++++++++++++-----------
fs/xfs/xfs_iops.c | 39 ++++++++++++++++-----------------------
include/linux/fs.h | 1 +
4 files changed, 45 insertions(+), 34 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d23362f..a5e0d0d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5574,6 +5574,11 @@ static int btrfs_update_time(struct inode *inode, struct timespec *now,
inode->i_mtime = *now;
if (flags & S_ATIME)
inode->i_atime = *now;
+ return 0;
+}
+
+static int btrfs_write_time(struct inode *inode)
+{
return btrfs_dirty_inode(inode);
}

@@ -9462,6 +9467,7 @@ static const struct inode_operations btrfs_dir_inode_operations = {
.get_acl = btrfs_get_acl,
.set_acl = btrfs_set_acl,
.update_time = btrfs_update_time,
+ .write_time = btrfs_write_time,
.tmpfile = btrfs_tmpfile,
};
static const struct inode_operations btrfs_dir_ro_inode_operations = {
@@ -9470,6 +9476,7 @@ static const struct inode_operations btrfs_dir_ro_inode_operations = {
.get_acl = btrfs_get_acl,
.set_acl = btrfs_set_acl,
.update_time = btrfs_update_time,
+ .write_time = btrfs_write_time,
};

static const struct file_operations btrfs_dir_file_operations = {
@@ -9540,6 +9547,7 @@ static const struct inode_operations btrfs_file_inode_operations = {
.get_acl = btrfs_get_acl,
.set_acl = btrfs_set_acl,
.update_time = btrfs_update_time,
+ .write_time = btrfs_write_time,
};
static const struct inode_operations btrfs_special_inode_operations = {
.getattr = btrfs_getattr,
@@ -9552,6 +9560,7 @@ static const struct inode_operations btrfs_special_inode_operations = {
.get_acl = btrfs_get_acl,
.set_acl = btrfs_set_acl,
.update_time = btrfs_update_time,
+ .write_time = btrfs_write_time,
};
static const struct inode_operations btrfs_symlink_inode_operations = {
.readlink = generic_readlink,
@@ -9565,6 +9574,7 @@ static const struct inode_operations btrfs_symlink_inode_operations = {
.listxattr = btrfs_listxattr,
.removexattr = btrfs_removexattr,
.update_time = btrfs_update_time,
+ .write_time = btrfs_write_time,
};

const struct dentry_operations btrfs_dentry_operations = {
diff --git a/fs/inode.c b/fs/inode.c
index 26753ba..8f5c4b5 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1499,17 +1499,24 @@ static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
*/
static int update_time(struct inode *inode, struct timespec *time, int flags)
{
- if (inode->i_op->update_time)
- return inode->i_op->update_time(inode, time, flags);
-
- if (flags & S_ATIME)
- inode->i_atime = *time;
- if (flags & S_VERSION)
- inode_inc_iversion(inode);
- if (flags & S_CTIME)
- inode->i_ctime = *time;
- if (flags & S_MTIME)
- inode->i_mtime = *time;
+ int ret;
+
+ if (inode->i_op->update_time) {
+ ret = inode->i_op->update_time(inode, time, flags);
+ if (ret)
+ return ret;
+ } else {
+ if (flags & S_ATIME)
+ inode->i_atime = *time;
+ if (flags & S_VERSION)
+ inode_inc_iversion(inode);
+ if (flags & S_CTIME)
+ inode->i_ctime = *time;
+ if (flags & S_MTIME)
+ inode->i_mtime = *time;
+ }
+ if (inode->i_op->write_time)
+ return inode->i_op->write_time(inode);
mark_inode_dirty_sync(inode);
return 0;
}
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index ec6dcdc..0e9653c 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -984,10 +984,8 @@ xfs_vn_setattr(
}

STATIC int
-xfs_vn_update_time(
- struct inode *inode,
- struct timespec *now,
- int flags)
+xfs_vn_write_time(
+ struct inode *inode)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
@@ -1004,21 +1002,16 @@ xfs_vn_update_time(
}

xfs_ilock(ip, XFS_ILOCK_EXCL);
- if (flags & S_CTIME) {
- inode->i_ctime = *now;
- ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec;
- ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec;
- }
- if (flags & S_MTIME) {
- inode->i_mtime = *now;
- ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec;
- ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec;
- }
- if (flags & S_ATIME) {
- inode->i_atime = *now;
- ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec;
- ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec;
- }
+
+ ip->i_d.di_ctime.t_sec = (__int32_t) inode->i_ctime.tv_sec;
+ ip->i_d.di_ctime.t_nsec = (__int32_t) inode->i_ctime.tv_nsec;
+
+ ip->i_d.di_mtime.t_sec = (__int32_t)inode->i_mtime.tv_sec;
+ ip->i_d.di_mtime.t_nsec = (__int32_t) inode->i_mtime.tv_nsec;
+
+ ip->i_d.di_atime.t_sec = (__int32_t) inode->i_atime.tv_sec;
+ ip->i_d.di_atime.t_nsec = (__int32_t) inode->i_atime.tv_nsec;
+
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
return xfs_trans_commit(tp, 0);
@@ -1129,7 +1122,7 @@ static const struct inode_operations xfs_inode_operations = {
.removexattr = generic_removexattr,
.listxattr = xfs_vn_listxattr,
.fiemap = xfs_vn_fiemap,
- .update_time = xfs_vn_update_time,
+ .write_time = xfs_vn_write_time,
};

static const struct inode_operations xfs_dir_inode_operations = {
@@ -1156,7 +1149,7 @@ static const struct inode_operations xfs_dir_inode_operations = {
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = xfs_vn_listxattr,
- .update_time = xfs_vn_update_time,
+ .write_time = xfs_vn_write_time,
.tmpfile = xfs_vn_tmpfile,
};

@@ -1184,7 +1177,7 @@ static const struct inode_operations xfs_dir_ci_inode_operations = {
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = xfs_vn_listxattr,
- .update_time = xfs_vn_update_time,
+ .write_time = xfs_vn_write_time,
.tmpfile = xfs_vn_tmpfile,
};

@@ -1198,7 +1191,7 @@ static const struct inode_operations xfs_symlink_inode_operations = {
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = xfs_vn_listxattr,
- .update_time = xfs_vn_update_time,
+ .write_time = xfs_vn_write_time,
};

STATIC void
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9ab779e..3633239 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1545,6 +1545,7 @@ struct inode_operations {
int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
u64 len);
int (*update_time)(struct inode *, struct timespec *, int);
+ int (*write_time)(struct inode *);
int (*atomic_open)(struct inode *, struct dentry *,
struct file *, unsigned open_flag,
umode_t create_mode, int *opened);