[PATCH 5/9] xfs: wire up new v5 bulkstat ioctls

Darrick J. Wong
2019-05-29T22:28:08Z

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

Wire up the new v5 BULKSTAT ioctl and rename the old one to V1.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/libxfs/xfs_fs.h | 24 +++++++++++
fs/xfs/xfs_ioctl.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++
fs/xfs/xfs_ioctl32.c | 1
fs/xfs/xfs_ondisk.h | 1
4 files changed, 129 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 8b8fe78511fb..960f3542e207 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -435,7 +435,6 @@ struct xfs_fsop_bulkreq {
__s32 __user *ocount; /* output count pointer */
};

-
/*
* Structures returned from xfs_inumbers routine (XFS_IOC_FSINUMBERS).
*/
@@ -457,6 +456,28 @@ struct xfs_inumbers {
#define XFS_INUMBERS_VERSION_V1 (1)
#define XFS_INUMBERS_VERSION_V5 (5)

+/* Header for bulk inode requests. */
+struct xfs_bulk_ireq {
+ uint64_t ino; /* I/O: start with this inode */
+ uint32_t flags; /* I/O: operation flags */
+ uint32_t icount; /* I: count of entries in buffer */
+ uint32_t ocount; /* O: count of entries filled out */
+ uint32_t reserved32; /* must be zero */
+ uint64_t reserved[5]; /* must be zero */
+};
+
+#define XFS_BULK_IREQ_FLAGS_ALL (0)
+
+/*
+ * ioctl structures for v5 bulkstat and inumbers requests
+ */
+struct xfs_bulkstat_req {
+ struct xfs_bulk_ireq hdr;
+ struct xfs_bulkstat bulkstat[];
+};
+#define XFS_BULKSTAT_REQ_SIZE(nr) (sizeof(struct xfs_bulkstat_req) + \
+ (nr) * sizeof(struct xfs_bulkstat))
+
/*
* Error injection.
*/
@@ -758,6 +779,7 @@ struct xfs_scrub_metadata {
#define XFS_IOC_FSGEOMETRY_V4 _IOR ('X', 124, struct xfs_fsop_geom_v4)
#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)
/* XFS_IOC_GETFSUUID ---------- deprecated 140 */

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index e43ad688e683..f6724c75ba97 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -822,6 +822,107 @@ xfs_ioc_fsbulkstat(
return 0;
}

+/* Return 0 on success or positive error */
+static int
+xfs_bulkstat_fmt(
+ struct xfs_ibulk *breq,
+ const struct xfs_bulkstat *bstat)
+{
+ if (copy_to_user(breq->ubuffer, bstat, sizeof(struct xfs_bulkstat)))
+ return -EFAULT;
+ return xfs_ibulk_advance(breq, sizeof(struct xfs_bulkstat));
+}
+
+/*
+ * Check the incoming bulk request @hdr from userspace and initialize the
+ * internal @breq bulk request appropriately. Returns 0 if the bulk request
+ * should proceed; 1 if there's nothing to do; or the usual negative error
+ * code.
+ */
+static int
+xfs_bulk_ireq_setup(
+ struct xfs_mount *mp,
+ struct xfs_bulk_ireq *hdr,
+ struct xfs_ibulk *breq,
+ void __user *ubuffer)
+{
+ if (hdr->icount == 0 ||
+ (hdr->flags & ~XFS_BULK_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)
+ goto no_results;
+
+ breq->ubuffer = ubuffer;
+ breq->icount = hdr->icount;
+ breq->startino = hdr->ino;
+ return 0;
+no_results:
+ hdr->ocount = 0;
+ return 1;
+}
+
+/*
+ * Update the userspace bulk request @hdr to reflect the end state of the
+ * internal bulk request @breq. If @error is negative then we return just
+ * that; otherwise (@error is 0 or 1) we copy the state so that userspace
+ * can discover what happened.
+ */
+static int
+xfs_bulk_ireq_teardown(
+ struct xfs_bulk_ireq *hdr,
+ struct xfs_ibulk *breq,
+ int error)
+{
+ if (error < 0)
+ return error;
+
+ hdr->ino = breq->startino;
+ hdr->ocount = breq->ocount;
+ return 0;
+}
+
+/* Handle the v5 bulkstat ioctl. */
+STATIC int
+xfs_ioc_bulkstat(
+ struct xfs_mount *mp,
+ unsigned int cmd,
+ struct xfs_bulkstat_req __user *arg)
+{
+ struct xfs_bulk_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_bulk_ireq_setup(mp, &hdr, &breq, arg->bulkstat);
+ if (error < 0)
+ return error;
+
+ if (!error)
+ error = xfs_bulkstat(&breq, xfs_bulkstat_fmt);
+
+ error = xfs_bulk_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,
@@ -1986,6 +2087,9 @@ xfs_file_ioctl(
case XFS_IOC_FSINUMBERS:
return xfs_ioc_fsbulkstat(mp, cmd, arg);

+ case XFS_IOC_BULKSTAT:
+ return xfs_ioc_bulkstat(mp, cmd, arg);
+
case XFS_IOC_FSGEOMETRY_V1:
return xfs_ioc_fsgeometry(mp, arg, 3);
case XFS_IOC_FSGEOMETRY_V4:
diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index bfe71747776b..84c342be4536 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -576,6 +576,7 @@ xfs_file_compat_ioctl(
case XFS_IOC_ERROR_CLEARALL:
case FS_IOC_GETFSMAP:
case XFS_IOC_SCRUB_METADATA:
+ case XFS_IOC_BULKSTAT:
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 d8f941b4d51c..954484c6eb96 100644
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -149,6 +149,7 @@ 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);
}

#endif /* __XFS_ONDISK_H */