Merge tag 'v6.6-vfs.ctime' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs timestamp updates from Christian Brauner:
 "This adds VFS support for multi-grain timestamps and converts tmpfs,
  xfs, ext4, and btrfs to use them. This carries acks from all relevant
  filesystems.

  The VFS always uses coarse-grained timestamps when updating the ctime
  and mtime after a change. This has the benefit of allowing filesystems
  to optimize away a lot of metadata updates, down to around 1 per
  jiffy, even when a file is under heavy writes.

  Unfortunately, this has always been an issue when we're exporting via
  NFSv3, which relies on timestamps to validate caches. A lot of changes
  can happen in a jiffy, so timestamps aren't sufficient to help the
  client decide to invalidate the cache.

  Even with NFSv4, a lot of exported filesystems don't properly support
  a change attribute and are subject to the same problems with timestamp
  granularity. Other applications have similar issues with timestamps
  (e.g., backup applications).

  If we were to always use fine-grained timestamps, that would improve
  the situation, but that becomes rather expensive, as the underlying
  filesystem would have to log a lot more metadata updates.

  This introduces fine-grained timestamps that are used when they are
  actively queried.

  This uses the 31st bit of the ctime tv_nsec field to indicate that
  something has queried the inode for the mtime or ctime. When this flag
  is set, on the next mtime or ctime update, the kernel will fetch a
  fine-grained timestamp instead of the usual coarse-grained one.

  As POSIX generally mandates that when the mtime changes, the ctime
  must also change the kernel always stores normalized ctime values, so
  only the first 30 bits of the tv_nsec field are ever used.

  Filesytems can opt into this behavior by setting the FS_MGTIME flag in
  the fstype. Filesystems that don't set this flag will continue to use
  coarse-grained timestamps.

  Various preparatory changes, fixes and cleanups are included:

   - Fixup all relevant places where POSIX requires updating ctime
     together with mtime. This is a wide-range of places and all
     maintainers provided necessary Acks.

   - Add new accessors for inode->i_ctime directly and change all
     callers to rely on them. Plain accesses to inode->i_ctime are now
     gone and it is accordingly rename to inode->__i_ctime and commented
     as requiring accessors.

   - Extend generic_fillattr() to pass in a request mask mirroring in a
     sense the statx() uapi. This allows callers to pass in a request
     mask to only get a subset of attributes filled in.

   - Rework timestamp updates so it's possible to drop the @now
     parameter the update_time() inode operation and associated helpers.

   - Add inode_update_timestamps() and convert all filesystems to it
     removing a bunch of open-coding"

* tag 'v6.6-vfs.ctime' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (107 commits)
  btrfs: convert to multigrain timestamps
  ext4: switch to multigrain timestamps
  xfs: switch to multigrain timestamps
  tmpfs: add support for multigrain timestamps
  fs: add infrastructure for multigrain timestamps
  fs: drop the timespec64 argument from update_time
  xfs: have xfs_vn_update_time gets its own timestamp
  fat: make fat_update_time get its own timestamp
  fat: remove i_version handling from fat_update_time
  ubifs: have ubifs_update_time use inode_update_timestamps
  btrfs: have it use inode_update_timestamps
  fs: drop the timespec64 arg from generic_update_time
  fs: pass the request_mask to generic_fillattr
  fs: remove silly warning from current_time
  gfs2: fix timestamp handling on quota inodes
  fs: rename i_ctime field to __i_ctime
  selinux: convert to ctime accessor functions
  security: convert to ctime accessor functions
  apparmor: convert to ctime accessor functions
  sunrpc: convert to ctime accessor functions
  ...

8 files changed, 19 insertions, 19 deletions

diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index 82b17d7fc93f..7e54c31589c7 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -237,7 +237,7 @@ ext2_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 	error = __ext2_set_acl(inode, acl, type);
 	if (!error && update_mode) {
 		inode->i_mode = mode;
-		inode->i_ctime = current_time(inode);
+		inode_set_ctime_current(inode);
 		mark_inode_dirty(inode);
 	}
 	return error;
diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index 42db804794bd..b335f17f682f 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -468,7 +468,7 @@ int ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
 	ext2_set_de_type(de, inode);
 	ext2_commit_chunk(page, pos, len);
 	if (update_times)
-		dir->i_mtime = dir->i_ctime = current_time(dir);
+		dir->i_mtime = inode_set_ctime_current(dir);
 	EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
 	mark_inode_dirty(dir);
 	return ext2_handle_dirsync(dir);
@@ -555,7 +555,7 @@ got_it:
 	de->inode = cpu_to_le32(inode->i_ino);
 	ext2_set_de_type (de, inode);
 	ext2_commit_chunk(page, pos, rec_len);
-	dir->i_mtime = dir->i_ctime = current_time(dir);
+	dir->i_mtime = inode_set_ctime_current(dir);
 	EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
 	mark_inode_dirty(dir);
 	err = ext2_handle_dirsync(dir);
@@ -606,7 +606,7 @@ int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct page *page)
 		pde->rec_len = ext2_rec_len_to_disk(to - from);
 	dir->inode = 0;
 	ext2_commit_chunk(page, pos, to - from);
-	inode->i_ctime = inode->i_mtime = current_time(inode);
+	inode->i_mtime = inode_set_ctime_current(inode);
 	EXT2_I(inode)->i_flags &= ~EXT2_BTREE_FL;
 	mark_inode_dirty(inode);
 	return ext2_handle_dirsync(inode);
diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index a4e1d7a9c544..124df89689e1 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -549,7 +549,7 @@ got:
 
 	inode->i_ino = ino;
 	inode->i_blocks = 0;
-	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
+	inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode);
 	memset(ei->i_data, 0, sizeof(ei->i_data));
 	ei->i_flags =
 		ext2_mask_flags(mode, EXT2_I(dir)->i_flags & EXT2_FL_INHERITED);
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 75983215c7a1..acbab27fe957 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -595,7 +595,7 @@ static void ext2_splice_branch(struct inode *inode,
 	if (where->bh)
 		mark_buffer_dirty_inode(where->bh, inode);
 
-	inode->i_ctime = current_time(inode);
+	inode_set_ctime_current(inode);
 	mark_inode_dirty(inode);
 }
 
@@ -1287,7 +1287,7 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
 	__ext2_truncate_blocks(inode, newsize);
 	filemap_invalidate_unlock(inode->i_mapping);
 
-	inode->i_mtime = inode->i_ctime = current_time(inode);
+	inode->i_mtime = inode_set_ctime_current(inode);
 	if (inode_needs_sync(inode)) {
 		sync_mapping_buffers(inode->i_mapping);
 		sync_inode_metadata(inode, 1);
@@ -1409,9 +1409,9 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
 	set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
 	inode->i_size = le32_to_cpu(raw_inode->i_size);
 	inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime);
-	inode->i_ctime.tv_sec = (signed)le32_to_cpu(raw_inode->i_ctime);
+	inode_set_ctime(inode, (signed)le32_to_cpu(raw_inode->i_ctime), 0);
 	inode->i_mtime.tv_sec = (signed)le32_to_cpu(raw_inode->i_mtime);
-	inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0;
+	inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
 	ei->i_dtime = le32_to_cpu(raw_inode->i_dtime);
 	/* We now have enough fields to check if the inode was active or not.
 	 * This is needed because nfsd might try to access dead inodes
@@ -1541,7 +1541,7 @@ static int __ext2_write_inode(struct inode *inode, int do_sync)
 	raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
 	raw_inode->i_size = cpu_to_le32(inode->i_size);
 	raw_inode->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
-	raw_inode->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
+	raw_inode->i_ctime = cpu_to_le32(inode_get_ctime(inode).tv_sec);
 	raw_inode->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
 
 	raw_inode->i_blocks = cpu_to_le32(inode->i_blocks);
@@ -1628,7 +1628,7 @@ int ext2_getattr(struct mnt_idmap *idmap, const struct path *path,
 			STATX_ATTR_IMMUTABLE |
 			STATX_ATTR_NODUMP);
 
-	generic_fillattr(&nop_mnt_idmap, inode, stat);
+	generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
 	return 0;
 }
 
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index cc87d413eb43..44e04484e570 100644
--- a/fs/ext2/ioctl.c
+++ b/fs/ext2/ioctl.c
@@ -44,7 +44,7 @@ int ext2_fileattr_set(struct mnt_idmap *idmap,
 		(fa->flags & EXT2_FL_USER_MODIFIABLE);
 
 	ext2_set_inode_flags(inode);
-	inode->i_ctime = current_time(inode);
+	inode_set_ctime_current(inode);
 	mark_inode_dirty(inode);
 
 	return 0;
@@ -77,7 +77,7 @@ long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		}
 
 		inode_lock(inode);
-		inode->i_ctime = current_time(inode);
+		inode_set_ctime_current(inode);
 		inode->i_generation = generation;
 		inode_unlock(inode);
 
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 937dd8f60f96..059517068adc 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -211,7 +211,7 @@ static int ext2_link (struct dentry * old_dentry, struct inode * dir,
 	if (err)
 		return err;
 
-	inode->i_ctime = current_time(inode);
+	inode_set_ctime_current(inode);
 	inode_inc_link_count(inode);
 	ihold(inode);
 
@@ -291,7 +291,7 @@ static int ext2_unlink(struct inode *dir, struct dentry *dentry)
 	if (err)
 		goto out;
 
-	inode->i_ctime = dir->i_ctime;
+	inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
 	inode_dec_link_count(inode);
 	err = 0;
 out:
@@ -367,7 +367,7 @@ static int ext2_rename (struct mnt_idmap * idmap,
 		ext2_put_page(new_page, new_de);
 		if (err)
 			goto out_dir;
-		new_inode->i_ctime = current_time(new_inode);
+		inode_set_ctime_current(new_inode);
 		if (dir_de)
 			drop_nlink(new_inode);
 		inode_dec_link_count(new_inode);
@@ -383,7 +383,7 @@ static int ext2_rename (struct mnt_idmap * idmap,
 	 * Like most other Unix systems, set the ctime for inodes on a
  	 * rename.
 	 */
-	old_inode->i_ctime = current_time(old_inode);
+	inode_set_ctime_current(old_inode);
 	mark_inode_dirty(old_inode);
 
 	err = ext2_delete_entry(old_de, old_page);
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 2959afc7541c..aaf3e3e88cb2 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1572,7 +1572,7 @@ out:
 	if (inode->i_size < off+len-towrite)
 		i_size_write(inode, off+len-towrite);
 	inode_inc_iversion(inode);
-	inode->i_mtime = inode->i_ctime = current_time(inode);
+	inode->i_mtime = inode_set_ctime_current(inode);
 	mark_inode_dirty(inode);
 	return len - towrite;
 }
diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index 8906ba479aaf..1c9187188d68 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -773,7 +773,7 @@ ext2_xattr_set2(struct inode *inode, struct buffer_head *old_bh,
 
 	/* Update the inode. */
 	EXT2_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0;
-	inode->i_ctime = current_time(inode);
+	inode_set_ctime_current(inode);
 	if (IS_SYNC(inode)) {
 		error = sync_inode_metadata(inode, 1);
 		/* In case sync failed due to ENOSPC the inode was actually