fs: Replace CURRENT_TIME with current_time() for inode timestamps

CURRENT_TIME macro is not appropriate for filesystems as it
doesn't use the right granularity for filesystem timestamps.
Use current_time() instead.

CURRENT_TIME is also not y2038 safe.

This is also in preparation for the patch that transitions
vfs timestamps to use 64 bit time and hence make them
y2038 safe. As part of the effort current_time() will be
extended to do range checks. Hence, it is necessary for all
file system timestamps to use current_time(). Also,
current_time() will be transitioned along with vfs to be
y2038 safe.

Note that whenever a single call to current_time() is used
to change timestamps in different inodes, it is because they
share the same time granularity.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Felipe Balbi <balbi@kernel.org>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Acked-by: David Sterba <dsterba@suse.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 10 insertions, 10 deletions

diff --git a/mm/shmem.c b/mm/shmem.c
index fd8b2b5741b1..28ae88bbeffa 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -933,7 +933,7 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
 void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)
 {
         shmem_undo_range(inode, lstart, lend, false);
-        inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+        inode->i_ctime = inode->i_mtime = current_time(inode);
 }
 EXPORT_SYMBOL_GPL(shmem_truncate_range);
 
@@ -978,7 +978,7 @@ static int shmem_setattr(struct dentry *dentry, struct iattr *attr)
                         if (error)
                                 return error;
                         i_size_write(inode, newsize);
-                        inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+                        inode->i_ctime = inode->i_mtime = current_time(inode);
                 }
                 if (newsize <= oldsize) {
                         loff_t holebegin = round_up(newsize, PAGE_SIZE);
@@ -2082,7 +2082,7 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
                 inode->i_ino = get_next_ino();
                 inode_init_owner(inode, dir, mode);
                 inode->i_blocks = 0;
-                inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+                inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
                 inode->i_generation = get_seconds();
                 info = SHMEM_I(inode);
                 memset(info, 0, (char *)inode - (char *)info);
@@ -2853,7 +2853,7 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
 
         if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size)
                 i_size_write(inode, offset + len);
-        inode->i_ctime = CURRENT_TIME;
+        inode->i_ctime = current_time(inode);
 undone:
         spin_lock(&inode->i_lock);
         inode->i_private = NULL;
@@ -2906,7 +2906,7 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
 
                 error = 0;
                 dir->i_size += BOGO_DIRENT_SIZE;
-                dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+                dir->i_ctime = dir->i_mtime = current_time(dir);
                 d_instantiate(dentry, inode);
                 dget(dentry); /* Extra count - pin the dentry in core */
         }
@@ -2974,7 +2974,7 @@ static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentr
                 goto out;
 
         dir->i_size += BOGO_DIRENT_SIZE;
-        inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+        inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
         inc_nlink(inode);
         ihold(inode);   /* New dentry reference */
         dget(dentry);           /* Extra pinning count for the created dentry */
@@ -2991,7 +2991,7 @@ static int shmem_unlink(struct inode *dir, struct dentry *dentry)
                 shmem_free_inode(inode->i_sb);
 
         dir->i_size -= BOGO_DIRENT_SIZE;
-        inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+        inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
         drop_nlink(inode);
         dput(dentry);   /* Undo the count from "create" - this does all the work */
         return 0;
@@ -3024,7 +3024,7 @@ static int shmem_exchange(struct inode *old_dir, struct dentry *old_dentry, stru
         old_dir->i_ctime = old_dir->i_mtime =
         new_dir->i_ctime = new_dir->i_mtime =
         d_inode(old_dentry)->i_ctime =
-        d_inode(new_dentry)->i_ctime = CURRENT_TIME;
+        d_inode(new_dentry)->i_ctime = current_time(old_dir);
 
         return 0;
 }
@@ -3098,7 +3098,7 @@ static int shmem_rename2(struct inode *old_dir, struct dentry *old_dentry, struc
         new_dir->i_size += BOGO_DIRENT_SIZE;
         old_dir->i_ctime = old_dir->i_mtime =
         new_dir->i_ctime = new_dir->i_mtime =
-        inode->i_ctime = CURRENT_TIME;
+        inode->i_ctime = current_time(old_dir);
         return 0;
 }
 
@@ -3153,7 +3153,7 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s
                 put_page(page);
         }
         dir->i_size += BOGO_DIRENT_SIZE;
-        dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+        dir->i_ctime = dir->i_mtime = current_time(dir);
         d_instantiate(dentry, inode);
         dget(dentry);
         return 0;