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mount: warn only once about timestamp range expiration

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[ Upstream commit a128b054ce029554a4a52fc3abb8c1df8bafcaef ]

Commit f8b92ba67c ("mount: Add mount warning for impending timestamp
expiry") introduced a mount warning regarding filesystem timestamp
limits, that is printed upon each writable mount or remount.

This can result in a lot of unnecessary messages in the kernel log in
setups where filesystems are being frequently remounted (or mounted
multiple times).

Avoid this by setting a superblock flag which indicates that the warning
has been emitted at least once for any particular mount, as suggested in
[1].

Link: https://lore.kernel.org/CAHk-=wim6VGnxQmjfK_tDg6fbHYKL4EFkmnTjVr9QnRqjDBAeA@mail.gmail.com/ [1]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Anthony Iliopoulos <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Acked-by: Christian Brauner <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Deepa Dinamani <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Stable-dep-of: 4bcda1eaf184 ("mount: handle OOM on mnt_warn_timestamp_expiry")
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Anthony Iliopoulos 2022-03-22 14:39:22 -07:00 • committed by Greg Kroah-Hartman
commit 7e2e113f94
2 changed files with 3 additions and 0 deletions
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2
fs/namespace.c
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@ -2492,6 +2492,7 @@ static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *
struct super_block *sb = mnt->mnt_sb;
if (!__mnt_is_readonly(mnt) &&
(!(sb->s_iflags & SB_I_TS_EXPIRY_WARNED)) &&
(ktime_get_real_seconds() + TIME_UPTIME_SEC_MAX > sb->s_time_max)) {
char *buf = (char *)__get_free_page(GFP_KERNEL);
char *mntpath = buf ? d_path(mountpoint, buf, PAGE_SIZE) : ERR_PTR(-ENOMEM);
@ -2506,6 +2507,7 @@ static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *
tm.tm_year+1900, (unsigned long long)sb->s_time_max);
free_page((unsigned long)buf);
sb->s_iflags |= SB_I_TS_EXPIRY_WARNED;
}
}