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Avoid showing stale errors when nmount(2) fails.

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Sometimes nmount(2) will fail without setting errmsg. The previous (ignored)
error would then be shown as the reason for the failed call if the next
nmount(2) also fails without [ENOENT,ENOTSUP].

An example is when there is a tmpfs mounted with -o size. vfs_filteropt() adds
'size' as an error in errmsg due to 'size' not being in tmpfs_updateopts. Then
tmpfs_mount returns [ENOTSUP] from nmount(2), which is then ignored. The next
call may race with an unmount causing an invalid [EINVAL] that then does log an
error, with the tmpfs errmsg.

The race itself is a separate issue to fix as it is expected to have an
[ENOENT] returned instead.

In this example the mount being shown is actually nullfs, not tmpfs that the
error is from.

  mountd[740]: can't delete exports for /poudriere/data/.m/exp-head-commit-test-devel/04/.npkg: Invalid argument mount option <size> is unknown

It should only show:

  mountd[740]: can't delete exports for /poudriere/data/.m/exp-head-commit-test-devel/04/.npkg: Invalid argument

MFC after:	2 weeks
This commit is contained in:
Bryan Drewery 2014-08-19 21:04:31 +00:00
parent 11cb1b138e
commit 4a185fa6c9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=270183
1 changed files with 2 additions and 0 deletions
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2
usr.sbin/mountd/mountd.c
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@ -1744,6 +1744,7 @@ get_exportlist(void)
iov[3].iov_len = strlen(fsp->f_mntonname) + 1;
iov[5].iov_base = fsp->f_mntfromname;
iov[5].iov_len = strlen(fsp->f_mntfromname) + 1;
errmsg[0] = '\0';
if (nmount(iov, iovlen, fsp->f_flags) < 0 &&
errno != ENOENT && errno != ENOTSUP) {
@ -2501,6 +2502,7 @@ do_mount(struct exportlist *ep, struct grouplist *grp, int exflags,
iov[3].iov_len = strlen(fsb->f_mntonname) + 1;
iov[5].iov_base = fsb->f_mntfromname; /* "from" */
iov[5].iov_len = strlen(fsb->f_mntfromname) + 1;
errmsg[0] = '\0';
while (nmount(iov, iovlen, fsb->f_flags) < 0) {
if (cp)