Wire up label ioctls for XFS.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
This is where the implementation questions come in;
is using growlock an abomination? How can I make the
primary super change immediately visible?
fs/xfs/xfs_ioctl.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index dbca737..ab59213 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -41,6 +41,8 @@
#include "xfs_trans.h"
#include "xfs_pnfs.h"
#include "xfs_acl.h"
+#include "xfs_log.h"
+#include "xfs_sb.h"
#include <linux/capability.h>
#include <linux/dcache.h>
@@ -1603,6 +1605,62 @@ xfs_ioc_swapext(
return error;
}
+static int
+xfs_ioc_getlabel(
+ struct xfs_mount *mp,
+ char __user *label)
+{
+ int error = 0;
+ struct xfs_sb *sbp = &mp->m_sb;
+
+ if (!mutex_trylock(&mp->m_growlock))
+ return -EWOULDBLOCK;
+ if (copy_to_user(label, sbp->sb_fname, sizeof(sbp->sb_fname)))
+ error = -EFAULT;
+ mutex_unlock(&mp->m_growlock);
+ return error;
+}
+
+static int
+xfs_ioc_setlabel(
+ struct file *filp,
+ struct xfs_mount *mp,
+ char __user *newlabel)
+{
+ int error;
+ struct xfs_sb *sbp = &mp->m_sb;
+ char sb_fname[12];
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(sb_fname, newlabel, sizeof(sb_fname)))
+ return -EFAULT;
+
+ error = mnt_want_write_file(filp);
+ if (error)
+ return error;
+
+ /* growfs & label both muck w/ the super directly... */
+ if (!mutex_trylock(&mp->m_growlock))
+ return -EWOULDBLOCK;
+ memset(sbp->sb_fname, 0, sizeof(sbp->sb_fname));
+ strncpy(sbp->sb_fname, sb_fname, sizeof(sbp->sb_fname));
+
+ error = xfs_sync_sb(mp, true);
+ if (error)
+ goto out;
+ /*
+ * Most kernelspace superblock updates only update sb 0.
+ * Userspace relabel has always updated all, though, so:
+ */
+ error = xfs_update_secondary_supers(mp, sbp->sb_agcount, 0);
+out:
+ mutex_unlock(&mp->m_growlock);
+ mnt_drop_write_file(filp);
+ return error;
+}
+
/*
* Note: some of the ioctl's return positive numbers as a
* byte count indicating success, such as readlink_by_handle.
@@ -1630,6 +1688,10 @@ xfs_file_ioctl(
switch (cmd) {
case FITRIM:
return xfs_ioc_trim(mp, arg);
+ case FS_IOC_GET_FSLABEL:
+ return xfs_ioc_getlabel(mp, arg);
+ case FS_IOC_SET_FSLABEL:
+ return xfs_ioc_setlabel(filp, mp, arg);
case XFS_IOC_ALLOCSP:
case XFS_IOC_FREESP:
case XFS_IOC_RESVSP:
--
1.7.1
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