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fs: kernfs: Replace CURRENT_TIME by current_fs_time()

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This is in preparation for the series that transitions
filesystem timestamps to use 64 bit time and hence make
them y2038 safe.

CURRENT_TIME macro will be deleted before merging the
aforementioned series.

Use current_fs_time() instead of CURRENT_TIME for inode
timestamps.

struct kernfs_node is associated with a sysfs file/ directory.
Truncate the values to appropriate time granularity when
writing to inode timestamps of the files.

ktime_get_real_ts() is used to obtain times for
struct kernfs_iattrs. Since these times are later assigned to
inode times using timespec_truncate() for all filesystem based
operations, we can save the supers list traversal time here by
using ktime_get_real_ts() directly.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Deepa Dinamani 2016-02-22 07:17:53 -08:00 committed by Greg Kroah-Hartman
parent 1b48b530da
commit 3a3a5fece6
2 changed files with 15 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/kernfs/dir.c
View File

@ -753,7 +753,8 @@ int kernfs_add_one(struct kernfs_node *kn)
ps_iattr = parent->iattr;
if (ps_iattr) {
struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
ktime_get_real_ts(&ps_iattrs->ia_ctime);
ps_iattrs->ia_mtime = ps_iattrs->ia_ctime;
}
mutex_unlock(&kernfs_mutex);
@ -1279,8 +1280,9 @@ static void __kernfs_remove(struct kernfs_node *kn)
/* update timestamps on the parent */
if (ps_iattr) {
ps_iattr->ia_iattr.ia_ctime = CURRENT_TIME;
ps_iattr->ia_iattr.ia_mtime = CURRENT_TIME;
ktime_get_real_ts(&ps_iattr->ia_iattr.ia_ctime);
ps_iattr->ia_iattr.ia_mtime =
ps_iattr->ia_iattr.ia_ctime;
}
kernfs_put(pos);

15
fs/kernfs/inode.c
View File

@ -54,7 +54,10 @@ static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn)
iattrs->ia_mode = kn->mode;
iattrs->ia_uid = GLOBAL_ROOT_UID;
iattrs->ia_gid = GLOBAL_ROOT_GID;
iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME;
ktime_get_real_ts(&iattrs->ia_atime);
iattrs->ia_mtime = iattrs->ia_atime;
iattrs->ia_ctime = iattrs->ia_atime;
simple_xattrs_init(&kn->iattr->xattrs);
out_unlock:
@ -236,16 +239,18 @@ ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size)
static inline void set_default_inode_attr(struct inode *inode, umode_t mode)
{
inode->i_mode = mode;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inode->i_atime = inode->i_mtime =
inode->i_ctime = current_fs_time(inode->i_sb);
}
static inline void set_inode_attr(struct inode *inode, struct iattr *iattr)
{
struct super_block *sb = inode->i_sb;
inode->i_uid = iattr->ia_uid;
inode->i_gid = iattr->ia_gid;
inode->i_atime = iattr->ia_atime;
inode->i_mtime = iattr->ia_mtime;
inode->i_ctime = iattr->ia_ctime;
inode->i_atime = timespec_trunc(iattr->ia_atime, sb->s_time_gran);
inode->i_mtime = timespec_trunc(iattr->ia_mtime, sb->s_time_gran);
inode->i_ctime = timespec_trunc(iattr->ia_ctime, sb->s_time_gran);
}
static void kernfs_refresh_inode(struct kernfs_node *kn, struct inode *inode)