Commit d0adde57 authored by Matthew Garrett's avatar Matthew Garrett Committed by Linus Torvalds
Browse files

Add a strictatime mount option 



Add support for explicitly requesting full atime updates. This makes it
possible for kernels to default to relatime but still allow userspace to
override it.

Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 11ff6f05

fs/namespace.c

+5 −1
Original line number Diff line number Diff line
@@ -780,6 +780,7 @@ static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt) 
		{ MNT_NOATIME, ",noatime" },

		{ MNT_NODIRATIME, ",nodiratime" },

		{ MNT_RELATIME, ",relatime" },

		{ MNT_STRICTATIME, ",strictatime" },

		{ 0, NULL }

	};

	const struct proc_fs_info *fs_infop;
@@ -1932,11 +1933,14 @@ long do_mount(char *dev_name, char *dir_name, char *type_page, 
		mnt_flags |= MNT_NODIRATIME;

	if (flags & MS_RELATIME)

		mnt_flags |= MNT_RELATIME;

	if (flags & MS_STRICTATIME)

		mnt_flags &= ~(MNT_RELATIME | MNT_NOATIME);

	if (flags & MS_RDONLY)

		mnt_flags |= MNT_READONLY;



	flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE |

		   MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT);

		   MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT |

		   MS_STRICTATIME);



	/* ... and get the mountpoint */

	retval = kern_path(dir_name, LOOKUP_FOLLOW, &path);

include/linux/fs.h

+1 −0
Original line number Diff line number Diff line
@@ -141,6 +141,7 @@ struct inodes_stat_t { 
#define MS_RELATIME	(1<<21)	/* Update atime relative to mtime/ctime. */

#define MS_KERNMOUNT	(1<<22) /* this is a kern_mount call */

#define MS_I_VERSION	(1<<23) /* Update inode I_version field */

#define MS_STRICTATIME	(1<<24) /* Always perform atime updates */

#define MS_ACTIVE	(1<<30)

#define MS_NOUSER	(1<<31)

include/linux/mount.h

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ struct mnt_namespace; 
#define MNT_NODIRATIME	0x10

#define MNT_RELATIME	0x20

#define MNT_READONLY	0x40	/* does the user want this to be r/o? */

#define MNT_STRICTATIME 0x80



#define MNT_SHRINKABLE	0x100

#define MNT_IMBALANCED_WRITE_COUNT	0x200 /* just for debugging */