[PATCH 6/9] xfs: wire up the new v5 bulkstat_single ioctl

Darrick J. Wong
2019-05-29T22:28:14Z

From: Darrick J. Wong <darrick.wong@oracle.com>

Wire up the V5 BULKSTAT_SINGLE ioctl and rename the old one V1.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/libxfs/xfs_fs.h | 16 +++++++++
fs/xfs/xfs_ioctl.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
fs/xfs/xfs_ioctl32.c | 1 +
fs/xfs/xfs_ondisk.h | 1 +
4 files changed, 103 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 960f3542e207..95d0411dae9b 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -468,6 +468,16 @@ struct xfs_bulk_ireq {

#define XFS_BULK_IREQ_FLAGS_ALL (0)

+/* Header for a single inode request. */
+struct xfs_ireq {
+ uint64_t ino; /* I/O: start with this inode */
+ uint32_t flags; /* I/O: operation flags */
+ uint32_t reserved32; /* must be zero */
+ uint64_t reserved[2]; /* must be zero */
+};
+
+#define XFS_IREQ_FLAGS_ALL (0)
+
/*
* ioctl structures for v5 bulkstat and inumbers requests
*/
@@ -478,6 +488,11 @@ struct xfs_bulkstat_req {
#define XFS_BULKSTAT_REQ_SIZE(nr) (sizeof(struct xfs_bulkstat_req) + \
(nr) * sizeof(struct xfs_bulkstat))

+struct xfs_bulkstat_single_req {
+ struct xfs_ireq hdr;
+ struct xfs_bulkstat bulkstat;
+};
+
/*
* Error injection.
*/
@@ -780,6 +795,7 @@ struct xfs_scrub_metadata {
#define XFS_IOC_GOINGDOWN _IOR ('X', 125, uint32_t)
#define XFS_IOC_FSGEOMETRY _IOR ('X', 126, struct xfs_fsop_geom)
#define XFS_IOC_BULKSTAT _IOR ('X', 127, struct xfs_bulkstat_req)
+#define XFS_IOC_BULKSTAT_SINGLE _IOR ('X', 128, struct xfs_bulkstat_single_req)
/* XFS_IOC_GETFSUUID ---------- deprecated 140 */

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index f6724c75ba97..f6971eb9561e 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -923,6 +923,89 @@ xfs_ioc_bulkstat(
return 0;
}

+/*
+ * Check the incoming singleton request @hdr from userspace and initialize the
+ * internal @breq bulk request appropriately. Returns 0 if the bulk request
+ * should proceed; or the usual negative error code.
+ */
+static int
+xfs_ireq_setup(
+ struct xfs_mount *mp,
+ struct xfs_ireq *hdr,
+ struct xfs_ibulk *breq,
+ void __user *ubuffer)
+{
+ if ((hdr->flags & ~XFS_IREQ_FLAGS_ALL) ||
+ hdr->reserved32 ||
+ memchr_inv(hdr->reserved, 0, sizeof(hdr->reserved)))
+ return -EINVAL;
+
+ if (XFS_INO_TO_AGNO(mp, hdr->ino) >= mp->m_sb.sb_agcount)
+ return -EINVAL;
+
+ breq->ubuffer = ubuffer;
+ breq->icount = 1;
+ breq->startino = hdr->ino;
+ return 0;
+}
+
+/*
+ * Update the userspace singleton request @hdr to reflect the end state of the
+ * internal bulk request @breq. If @error is negative then we return just
+ * that; otherwise we copy the state so that userspace can discover what
+ * happened.
+ */
+static int
+xfs_ireq_teardown(
+ struct xfs_ireq *hdr,
+ struct xfs_ibulk *breq,
+ int error)
+{
+ if (error < 0)
+ return error;
+
+ hdr->ino = breq->startino;
+ return 0;
+}
+
+/* Handle the v5 bulkstat_single ioctl. */
+STATIC int
+xfs_ioc_bulkstat_single(
+ struct xfs_mount *mp,
+ unsigned int cmd,
+ struct xfs_bulkstat_single_req __user *arg)
+{
+ struct xfs_ireq hdr;
+ struct xfs_ibulk breq = {
+ .mp = mp,
+ };
+ int error;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ if (copy_from_user(&hdr, &arg->hdr, sizeof(hdr)))
+ return -EFAULT;
+
+ error = xfs_ireq_setup(mp, &hdr, &breq, &arg->bulkstat);
+ if (error)
+ return error;
+
+ error = xfs_bulkstat_one(&breq, xfs_bulkstat_fmt);
+
+ error = xfs_ireq_teardown(&hdr, &breq, error);
+ if (error)
+ return error;
+
+ if (copy_to_user(&arg->hdr, &hdr, sizeof(hdr)))
+ return -EFAULT;
+
+ return 0;
+}
+
STATIC int
xfs_ioc_fsgeometry(
struct xfs_mount *mp,
@@ -2089,6 +2172,8 @@ xfs_file_ioctl(

case XFS_IOC_BULKSTAT:
return xfs_ioc_bulkstat(mp, cmd, arg);
+ case XFS_IOC_BULKSTAT_SINGLE:
+ return xfs_ioc_bulkstat_single(mp, cmd, arg);

case XFS_IOC_FSGEOMETRY_V1:
return xfs_ioc_fsgeometry(mp, arg, 3);
diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index 84c342be4536..08a90e3459d1 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -577,6 +577,7 @@ xfs_file_compat_ioctl(
case FS_IOC_GETFSMAP:
case XFS_IOC_SCRUB_METADATA:
case XFS_IOC_BULKSTAT:
+ case XFS_IOC_BULKSTAT_SINGLE:
return xfs_file_ioctl(filp, cmd, p);
#if !defined(BROKEN_X86_ALIGNMENT) || defined(CONFIG_X86_X32)
/*
diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
index 954484c6eb96..fa1252657b08 100644
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -150,6 +150,7 @@ xfs_check_ondisk_structs(void)
XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat, 192);
XFS_CHECK_STRUCT_SIZE(struct xfs_inumbers, 24);
XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat_req, 64);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_bulkstat_single_req, 224);
}

#endif /* __XFS_ONDISK_H */