[PATCH V9.1] xfs: Enable bulkstat ioctl to support 64-bit per-inode extent counters

Chandan Babu R
2022-04-09T13:57:36Z

The following changes are made to enable userspace to obtain 64-bit extent
counters,
1. Carve out a new 64-bit field xfs_bulkstat->bs_extents64 from
xfs_bulkstat->bs_pad[] to hold 64-bit extent counter.
2. Define the new flag XFS_BULK_IREQ_BULKSTAT for userspace to indicate that
it is capable of receiving 64-bit extent counters.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Suggested-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
---
fs/xfs/libxfs/xfs_fs.h | 20 ++++++++++++++++----
fs/xfs/xfs_ioctl.c | 3 +++
fs/xfs/xfs_itable.c | 9 ++++++++-
fs/xfs/xfs_itable.h | 3 +++
4 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 1f7238db35cc..2a42bfb85c3b 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -378,7 +378,7 @@ struct xfs_bulkstat {
uint32_t bs_extsize_blks; /* extent size hint, blocks */

uint32_t bs_nlink; /* number of links */
- uint32_t bs_extents; /* number of extents */
+ uint32_t bs_extents; /* 32-bit data fork extent counter */
uint32_t bs_aextents; /* attribute number of extents */
uint16_t bs_version; /* structure version */
uint16_t bs_forkoff; /* inode fork offset in bytes */
@@ -387,8 +387,9 @@ struct xfs_bulkstat {
uint16_t bs_checked; /* checked inode metadata */
uint16_t bs_mode; /* type and mode */
uint16_t bs_pad2; /* zeroed */
+ uint64_t bs_extents64; /* 64-bit data fork extent counter */

- uint64_t bs_pad[7]; /* zeroed */
+ uint64_t bs_pad[6]; /* zeroed */
};

#define XFS_BULKSTAT_VERSION_V1 (1)
@@ -469,8 +470,19 @@ struct xfs_bulk_ireq {
*/
#define XFS_BULK_IREQ_SPECIAL (1 << 1)

-#define XFS_BULK_IREQ_FLAGS_ALL (XFS_BULK_IREQ_AGNO | \
- XFS_BULK_IREQ_SPECIAL)
+/*
+ * Return data fork extent count via xfs_bulkstat->bs_extents64 field and assign
+ * 0 to xfs_bulkstat->bs_extents when the flag is set. Otherwise, use
+ * xfs_bulkstat->bs_extents for returning data fork extent count and set
+ * xfs_bulkstat->bs_extents64 to 0. In the second case, return -EOVERFLOW and
+ * assign 0 to xfs_bulkstat->bs_extents if data fork extent count is larger than
+ * XFS_MAX_EXTCNT_DATA_FORK_OLD.
+ */
+#define XFS_BULK_IREQ_NREXT64 (1 << 2)
+
+#define XFS_BULK_IREQ_FLAGS_ALL (XFS_BULK_IREQ_AGNO | \
+ XFS_BULK_IREQ_SPECIAL | \
+ XFS_BULK_IREQ_NREXT64)

/* Operate on the root directory inode. */
#define XFS_BULK_IREQ_SPECIAL_ROOT (1)
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 83481005317a..e9eadc7337ce 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -813,6 +813,9 @@ xfs_bulk_ireq_setup(
if (XFS_INO_TO_AGNO(mp, breq->startino) >= mp->m_sb.sb_agcount)
return -ECANCELED;

+ if (hdr->flags & XFS_BULK_IREQ_NREXT64)
+ breq->flags |= XFS_IBULK_NREXT64;
+
return 0;
}

diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index 71ed4905f206..f74c9fff72bb 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -64,6 +64,7 @@ xfs_bulkstat_one_int(
struct xfs_inode *ip; /* incore inode pointer */
struct inode *inode;
struct xfs_bulkstat *buf = bc->buf;
+ xfs_extnum_t nextents;
int error = -EINVAL;

if (xfs_internal_inum(mp, ino))
@@ -102,7 +103,13 @@ xfs_bulkstat_one_int(

buf->bs_xflags = xfs_ip2xflags(ip);
buf->bs_extsize_blks = ip->i_extsize;
- buf->bs_extents = xfs_ifork_nextents(&ip->i_df);
+
+ nextents = xfs_ifork_nextents(&ip->i_df);
+ if (!(bc->breq->flags & XFS_IBULK_NREXT64))
+ buf->bs_extents = min(nextents, XFS_MAX_EXTCNT_DATA_FORK_SMALL);
+ else
+ buf->bs_extents64 = nextents;
+
xfs_bulkstat_health(ip, buf);
buf->bs_aextents = xfs_ifork_nextents(ip->i_afp);
buf->bs_forkoff = XFS_IFORK_BOFF(ip);
diff --git a/fs/xfs/xfs_itable.h b/fs/xfs/xfs_itable.h
index 5ee1d3f44ce9..e2d0eba43f35 100644
--- a/fs/xfs/xfs_itable.h
+++ b/fs/xfs/xfs_itable.h
@@ -19,6 +19,9 @@ struct xfs_ibulk {
/* Only iterate within the same AG as startino */
#define XFS_IBULK_SAME_AG (1U << 0)

+/* Fill out the bs_extents64 field if set. */
+#define XFS_IBULK_NREXT64 (1U << 1)
+
/*
* Advance the user buffer pointer by one record of the given size. If the
* buffer is now full, return the appropriate error code.
--
2.30.2