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fs: remove mandatory file locking support

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We added CONFIG_MANDATORY_FILE_LOCKING in 2015, and soon after turned it
off in Fedora and RHEL8. Several other distros have followed suit.

I've heard of one problem in all that time: Someone migrated from an
older distro that supported "-o mand" to one that didn't, and the host
had a fstab entry with "mand" in it which broke on reboot. They didn't
actually _use_ mandatory locking so they just removed the mount option
and moved on.

This patch rips out mandatory locking support wholesale from the kernel,
along with the Kconfig option and the Documentation file. It also
changes the mount code to ignore the "mand" mount option instead of
erroring out, and to throw a big, ugly warning.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
Jeff Layton
2021-08-19 14:56:38 -04:00
parent 2f488f698f
commit f7e33bdbd6
19 changed files with 15 additions and 521 deletions
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12
fs/remap_range.c
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@@ -99,24 +99,12 @@ static int generic_remap_checks(struct file *file_in, loff_t pos_in,
static int remap_verify_area(struct file *file, loff_t pos, loff_t len,
bool write)
{
struct inode *inode = file_inode(file);
if (unlikely(pos < 0 || len < 0))
return -EINVAL;
if (unlikely((loff_t) (pos + len) < 0))
return -EINVAL;
if (unlikely(inode->i_flctx && mandatory_lock(inode))) {
loff_t end = len ? pos + len - 1 : OFFSET_MAX;
int retval;
retval = locks_mandatory_area(inode, file, pos, end,
write ? F_WRLCK : F_RDLCK);
if (retval < 0)
return retval;
}
return security_file_permission(file, write ? MAY_WRITE : MAY_READ);
}