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authorEric Biggers <ebiggers@google.com>2021-01-12 22:02:45 +0300
committerJan Kara <jack@suse.cz>2021-01-13 19:26:28 +0300
commite20b14db050ae25ef7c5a2d9a41dd62b7e5e75c1 (patch)
tree37c192ae23ae0d4ac134880fc51a42e93ee5fa62 /fs/inode.c
parent1e9d63331f8fa556f31e1406ab12f2a1e5cdb495 (diff)
downloadlinux-e20b14db050ae25ef7c5a2d9a41dd62b7e5e75c1.tar.xz
fs: only specify I_DIRTY_TIME when needed in generic_update_time()
generic_update_time() always passes I_DIRTY_TIME to __mark_inode_dirty(), which doesn't really make sense because (a) generic_update_time() might be asked to do only an i_version update, not also a timestamps update; and (b) I_DIRTY_TIME is only supposed to be set in i_state if the filesystem has lazytime enabled, so using it unconditionally in generic_update_time() is inconsistent. As a result there is a weird edge case where if only an i_version update was requested (not also a timestamps update) but it is no longer needed (i.e. inode_maybe_inc_iversion() returns false), then I_DIRTY_TIME will be set in i_state even if the filesystem isn't mounted with lazytime. Fix this by only passing I_DIRTY_TIME to __mark_inode_dirty() if the timestamps were updated and the filesystem has lazytime enabled. Link: https://lore.kernel.org/r/20210112190253.64307-4-ebiggers@kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c38
1 files changed, 20 insertions, 18 deletions
diff --git a/fs/inode.c b/fs/inode.c
index 6442d97d9a4a..d0fa43d8e9d5 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1743,24 +1743,26 @@ static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
int generic_update_time(struct inode *inode, struct timespec64 *time, int flags)
{
- int iflags = I_DIRTY_TIME;
- bool dirty = false;
-
- if (flags & S_ATIME)
- inode->i_atime = *time;
- if (flags & S_VERSION)
- dirty = inode_maybe_inc_iversion(inode, false);
- if (flags & S_CTIME)
- inode->i_ctime = *time;
- if (flags & S_MTIME)
- inode->i_mtime = *time;
- if ((flags & (S_ATIME | S_CTIME | S_MTIME)) &&
- !(inode->i_sb->s_flags & SB_LAZYTIME))
- dirty = true;
-
- if (dirty)
- iflags |= I_DIRTY_SYNC;
- __mark_inode_dirty(inode, iflags);
+ int dirty_flags = 0;
+
+ if (flags & (S_ATIME | S_CTIME | S_MTIME)) {
+ if (flags & S_ATIME)
+ inode->i_atime = *time;
+ if (flags & S_CTIME)
+ inode->i_ctime = *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;
+ }
+
+ if ((flags & S_VERSION) && inode_maybe_inc_iversion(inode, false))
+ dirty_flags |= I_DIRTY_SYNC;
+
+ __mark_inode_dirty(inode, dirty_flags);
return 0;
}
EXPORT_SYMBOL(generic_update_time);