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ocfs2_inode_lock_update(): make sure we don't change the type bits of i_mode

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... even if another node has gone insane.  Fail with -ESTALE if it detects
an attempt to change the type bits.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2021-02-13 22:39:18 -05:00
parent e89f00d602
commit 60606ecad1
1 changed files with 10 additions and 2 deletions
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12
fs/ocfs2/dlmglue.c
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@ -2204,7 +2204,7 @@ static void ocfs2_unpack_timespec(struct timespec64 *spec,
spec->tv_nsec = packed_time & OCFS2_NSEC_MASK;
}
static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
static int ocfs2_refresh_inode_from_lvb(struct inode *inode)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
@ -2213,6 +2213,8 @@ static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
mlog_meta_lvb(0, lockres);
lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
if (inode_wrong_type(inode, be16_to_cpu(lvb->lvb_imode)))
return -ESTALE;
/* We're safe here without the lockres lock... */
spin_lock(&oi->ip_lock);
@ -2240,6 +2242,7 @@ static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
ocfs2_unpack_timespec(&inode->i_ctime,
be64_to_cpu(lvb->lvb_ictime_packed));
spin_unlock(&oi->ip_lock);
return 0;
}
static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
@ -2342,7 +2345,8 @@ static int ocfs2_inode_lock_update(struct inode *inode,
if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
mlog(0, "Trusting LVB on inode %llu\n",
(unsigned long long)oi->ip_blkno);
ocfs2_refresh_inode_from_lvb(inode);
status = ocfs2_refresh_inode_from_lvb(inode);
goto bail_refresh;
} else {
/* Boo, we have to go to disk. */
/* read bh, cast, ocfs2_refresh_inode */
@ -2352,6 +2356,10 @@ static int ocfs2_inode_lock_update(struct inode *inode,
goto bail_refresh;
}
fe = (struct ocfs2_dinode *) (*bh)->b_data;
if (inode_wrong_type(inode, le16_to_cpu(fe->i_mode))) {
status = -ESTALE;
goto bail_refresh;
}
/* This is a good chance to make sure we're not
* locking an invalid object. ocfs2_read_inode_block()