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Code Issues Releases Activity

tmpfs: Allow update mounts only for certain options.

Browse Source 
Since r230208 update mounts were allowed if the list of mount options
contained the "export" option. This is not correct as tmpfs doesn't
really support updating all options.

Reviewed by:	kevlo, trociny
This commit is contained in:
Jaakko Heinonen 2012-04-16 18:07:42 +00:00
parent f933af5dbf
commit c5ab5ce345
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=234346
2 changed files with 15 additions and 6 deletions
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3
sys/fs/tmpfs/tmpfs.h
View File

@ -387,6 +387,9 @@ struct tmpfs_mount {
* tmpfs_pool.c. */
uma_zone_t tm_dirent_pool;
uma_zone_t tm_node_pool;
/* Read-only status. */
int tm_ronly;
};
#define TMPFS_LOCK(tm) mtx_lock(&(tm)->allnode_lock)
#define TMPFS_UNLOCK(tm) mtx_unlock(&(tm)->allnode_lock)

18
sys/fs/tmpfs/tmpfs_vfsops.c
View File

@ -82,6 +82,10 @@ static const char *tmpfs_opts[] = {
NULL
};
static const char *tmpfs_updateopts[] = {
"from", "export", NULL
};
/* --------------------------------------------------------------------- */
static int
@ -150,12 +154,13 @@ tmpfs_mount(struct mount *mp)
return (EINVAL);
if (mp->mnt_flag & MNT_UPDATE) {
/*
* Only support update mounts for NFS export.
*/
if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
return (0);
return (EOPNOTSUPP);
/* Only support update mounts for certain options. */
if (vfs_filteropt(mp->mnt_optnew, tmpfs_updateopts) != 0)
return (EOPNOTSUPP);
if (vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0) !=
((struct tmpfs_mount *)mp->mnt_data)->tm_ronly)
return (EOPNOTSUPP);
return (0);
}
vn_lock(mp->mnt_vnodecovered, LK_SHARED | LK_RETRY);
@ -228,6 +233,7 @@ tmpfs_mount(struct mount *mp)
tmpfs_node_ctor, tmpfs_node_dtor,
tmpfs_node_init, tmpfs_node_fini,
UMA_ALIGN_PTR, 0);
tmp->tm_ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
/* Allocate the root node. */
error = tmpfs_alloc_node(tmp, VDIR, root_uid,