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tmpfs_mount update: simplify, cache the value of VFS_TO_TMPFS() calculation.

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Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2020-02-04 18:52:25 +00:00
parent e88f22ff04
commit b66352b787
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357511
1 changed files with 5 additions and 4 deletions
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9
sys/fs/tmpfs/tmpfs_vfsops.c
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@ -346,6 +346,7 @@ tmpfs_mount(struct mount *mp)
/* Only support update mounts for certain options. */
if (vfs_filteropt(mp->mnt_optnew, tmpfs_updateopts) != 0)
return (EOPNOTSUPP);
tmp = VFS_TO_TMPFS(mp);
if (vfs_getopt_size(mp->mnt_optnew, "size", &size_max) == 0) {
/*
* On-the-fly resizing is not supported (yet). We still
@ -354,17 +355,17 @@ tmpfs_mount(struct mount *mp)
* parameter, say trying to change rw to ro or vice
* versa, would cause vfs_filteropt() to bail.
*/
if (size_max != VFS_TO_TMPFS(mp)->tm_size_max)
if (size_max != tmp->tm_size_max)
return (EOPNOTSUPP);
}
if (vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0) &&
!(VFS_TO_TMPFS(mp)->tm_ronly)) {
!tmp->tm_ronly) {
/* RW -> RO */
return (tmpfs_rw_to_ro(mp));
} else if (!vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0) &&
VFS_TO_TMPFS(mp)->tm_ronly) {
tmp->tm_ronly) {
/* RO -> RW */
VFS_TO_TMPFS(mp)->tm_ronly = 0;
tmp->tm_ronly = 0;
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_RDONLY;
MNT_IUNLOCK(mp);