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Register .remount_fs handler

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Register the missing .remount_fs handler.  This handler isn't strictly
required because the VFS does a pretty good job updating most of the
MS_* flags.  However, there's no harm in using the hook to call the
registered zpl callback for various MS_* flags.  Additionaly, this
allows us to lay the ground work for more complicated argument parsing
in the future.
This commit is contained in:
Brian Behlendorf 2011-03-15 12:41:19 -07:00
parent 03f9ba9d99
commit 0de19dad9c
3 changed files with 52 additions and 1 deletions
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1
include/sys/zfs_vfsops.h
View File

@ -187,6 +187,7 @@ extern int zfs_register_callbacks(zfs_sb_t *zsb);
extern void zfs_unregister_callbacks(zfs_sb_t *zsb);
extern int zfs_domount(struct super_block *sb, void *data, int silent);
extern int zfs_umount(struct super_block *sb);
extern int zfs_remount(struct super_block *sb, int *flags, char *data);
extern int zfs_root(zfs_sb_t *zsb, struct inode **ipp);
extern int zfs_statvfs(struct dentry *dentry, struct kstatfs *statp);
extern int zfs_vget(struct vfsmount *vfsp, struct inode **ipp, fid_t *fidp);

40
module/zfs/zfs_vfsops.c
View File

@ -1291,6 +1291,46 @@ zfs_umount(struct super_block *sb)
}
EXPORT_SYMBOL(zfs_umount);
int
zfs_remount(struct super_block *sb, int *flags, char *data)
{
zfs_sb_t *zsb = sb->s_fs_info;
boolean_t readonly = B_FALSE;
boolean_t setuid = B_TRUE;
boolean_t exec = B_TRUE;
boolean_t devices = B_TRUE;
boolean_t atime = B_TRUE;
if (*flags & MS_RDONLY)
readonly = B_TRUE;
if (*flags & MS_NOSUID) {
devices = B_FALSE;
setuid = B_FALSE;
} else {
if (*flags & MS_NODEV)
devices = B_FALSE;
}
if (*flags & MS_NOEXEC)
exec = B_FALSE;
if (*flags & MS_NOATIME)
atime = B_FALSE;
/*
* Invoke our callbacks to set required flags.
*/
readonly_changed_cb(zsb, readonly);
setuid_changed_cb(zsb, setuid);
exec_changed_cb(zsb, exec);
devices_changed_cb(zsb, devices);
atime_changed_cb(zsb, atime);
return (0);
}
EXPORT_SYMBOL(zfs_remount);
int
zfs_vget(struct vfsmount *vfsp, struct inode **ipp, fid_t *fidp)
{

12
module/zfs/zpl_super.c
View File

@ -129,6 +129,16 @@ zpl_statfs(struct dentry *dentry, struct kstatfs *statp)
return (error);
}
static int
zpl_remount_fs(struct super_block *sb, int *flags, char *data)
{
int error;
error = -zfs_remount(sb, flags, data);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_show_options(struct seq_file *seq, struct vfsmount *vfsp)
{
@ -197,7 +207,7 @@ const struct super_operations zpl_super_operations = {
.freeze_fs = NULL,
.unfreeze_fs = NULL,
.statfs = zpl_statfs,
.remount_fs = NULL,
.remount_fs = zpl_remount_fs,
.show_options = zpl_show_options,
.show_stats = NULL,
};