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authorJeff Layton <jlayton@kernel.org>2023-08-07 22:38:34 +0300
committerChristian Brauner <brauner@kernel.org>2023-08-09 09:56:37 +0300
commit541d4c798a598854fcce7326d947cbcbd35701d6 (patch)
tree26703c5d9b35218747b417efd69d77459a159a87 /fs/inode.c
parent0d72b92883c651a11059d93335f33d65c6eb653b (diff)
downloadlinux-541d4c798a598854fcce7326d947cbcbd35701d6.tar.xz
fs: drop the timespec64 arg from generic_update_time
In future patches we're going to change how the ctime is updated to keep track of when it has been queried. The way that the update_time operation works (and a lot of its callers) make this difficult, since they grab a timestamp early and then pass it down to eventually be copied into the inode. All of the existing update_time callers pass in the result of current_time() in some fashion. Drop the "time" parameter from generic_update_time, and rework it to fetch its own timestamp. This change means that an update_time could fetch a different timestamp than was seen in inode_needs_update_time. update_time is only ever called with one of two flag combinations: Either S_ATIME is set, or S_MTIME|S_CTIME|S_VERSION are set. With this change we now treat the flags argument as an indicator that some value needed to be updated when last checked, rather than an indication to update specific timestamps. Rework the logic for updating the timestamps and put it in a new inode_update_timestamps helper that other update_time routines can use. S_ATIME is as treated as we always have, but if any of the other three are set, then we attempt to update all three. Also, some callers of generic_update_time need to know what timestamps were actually updated. Change it to return an S_* flag mask to indicate that and rework the callers to expect it. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Message-Id: <20230807-mgctime-v7-3-d1dec143a704@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c84
1 files changed, 66 insertions, 18 deletions
diff --git a/fs/inode.c b/fs/inode.c
index 3fc251bfaf73..e07e45f6cd01 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1881,29 +1881,76 @@ static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
return 0;
}
-int generic_update_time(struct inode *inode, struct timespec64 *time, int flags)
+/**
+ * inode_update_timestamps - update the timestamps on the inode
+ * @inode: inode to be updated
+ * @flags: S_* flags that needed to be updated
+ *
+ * The update_time function is called when an inode's timestamps need to be
+ * updated for a read or write operation. This function handles updating the
+ * actual timestamps. It's up to the caller to ensure that the inode is marked
+ * dirty appropriately.
+ *
+ * In the case where any of S_MTIME, S_CTIME, or S_VERSION need to be updated,
+ * attempt to update all three of them. S_ATIME updates can be handled
+ * independently of the rest.
+ *
+ * Returns a set of S_* flags indicating which values changed.
+ */
+int inode_update_timestamps(struct inode *inode, int flags)
{
- int dirty_flags = 0;
+ int updated = 0;
+ struct timespec64 now;
+
+ if (flags & (S_MTIME|S_CTIME|S_VERSION)) {
+ struct timespec64 ctime = inode_get_ctime(inode);
- if (flags & (S_ATIME | S_CTIME | S_MTIME)) {
- if (flags & S_ATIME)
- inode->i_atime = *time;
- if (flags & S_CTIME)
- inode_set_ctime_to_ts(inode, *time);
- if (flags & S_MTIME)
- inode->i_mtime = *time;
-
- if (inode->i_sb->s_flags & SB_LAZYTIME)
- dirty_flags |= I_DIRTY_TIME;
- else
- dirty_flags |= I_DIRTY_SYNC;
+ now = inode_set_ctime_current(inode);
+ if (!timespec64_equal(&now, &ctime))
+ updated |= S_CTIME;
+ if (!timespec64_equal(&now, &inode->i_mtime)) {
+ inode->i_mtime = now;
+ updated |= S_MTIME;
+ }
+ if (IS_I_VERSION(inode) && inode_maybe_inc_iversion(inode, updated))
+ updated |= S_VERSION;
+ } else {
+ now = current_time(inode);
}
- if ((flags & S_VERSION) && inode_maybe_inc_iversion(inode, false))
- dirty_flags |= I_DIRTY_SYNC;
+ if (flags & S_ATIME) {
+ if (!timespec64_equal(&now, &inode->i_atime)) {
+ inode->i_atime = now;
+ updated |= S_ATIME;
+ }
+ }
+ return updated;
+}
+EXPORT_SYMBOL(inode_update_timestamps);
+
+/**
+ * generic_update_time - update the timestamps on the inode
+ * @inode: inode to be updated
+ * @flags: S_* flags that needed to be updated
+ *
+ * The update_time function is called when an inode's timestamps need to be
+ * updated for a read or write operation. In the case where any of S_MTIME, S_CTIME,
+ * or S_VERSION need to be updated we attempt to update all three of them. S_ATIME
+ * updates can be handled done independently of the rest.
+ *
+ * Returns a S_* mask indicating which fields were updated.
+ */
+int generic_update_time(struct inode *inode, int flags)
+{
+ int updated = inode_update_timestamps(inode, flags);
+ int dirty_flags = 0;
+ if (updated & (S_ATIME|S_MTIME|S_CTIME))
+ dirty_flags = inode->i_sb->s_flags & SB_LAZYTIME ? I_DIRTY_TIME : I_DIRTY_SYNC;
+ if (updated & S_VERSION)
+ dirty_flags |= I_DIRTY_SYNC;
__mark_inode_dirty(inode, dirty_flags);
- return 0;
+ return updated;
}
EXPORT_SYMBOL(generic_update_time);
@@ -1915,7 +1962,8 @@ int inode_update_time(struct inode *inode, struct timespec64 *time, int flags)
{
if (inode->i_op->update_time)
return inode->i_op->update_time(inode, time, flags);
- return generic_update_time(inode, time, flags);
+ generic_update_time(inode, flags);
+ return 0;
}
EXPORT_SYMBOL(inode_update_time);