diff options
| author | Darrick J. Wong <darrick.wong@oracle.com> | 2019-05-22 08:44:25 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2019-06-26 13:01:56 -0700 |
| commit | a077630dba26c4edbd534dd1d9e3ad2b97201bb4 (patch) | |
| tree | 7ea6dee6f6304498bc49cbd9bb327294325451ee | |
| parent | 4b4f3ae674e1bf79ff47f0b3ddd8e5b101d894bb (diff) | |
xfs: allow bulkstat_single of special inodesbulkstat-v5_2019-06-26
Create a new ireq flag (for single bulkstats) that enables userspace to
ask us for a special inode number instead of interpreting @ino as a
literal inode number. This enables us to query the root inode easily.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
| -rw-r--r-- | fs/xfs/libxfs/xfs_fs.h | 11 | ||||
| -rw-r--r-- | fs/xfs/xfs_ioctl.c | 10 |
2 files changed, 20 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h index 77c06850ac52..1489bce07d66 100644 --- a/fs/xfs/libxfs/xfs_fs.h +++ b/fs/xfs/libxfs/xfs_fs.h @@ -482,7 +482,16 @@ struct xfs_ireq { uint64_t reserved[2]; /* must be zero */ }; -#define XFS_IREQ_FLAGS_ALL (0) +/* + * The @ino value is a special value, not a literal inode number. See the + * XFS_IREQ_SPECIAL_* values below. + */ +#define XFS_IREQ_SPECIAL (1 << 0) + +#define XFS_IREQ_FLAGS_ALL (XFS_IREQ_SPECIAL) + +/* Operate on the root directory inode. */ +#define XFS_IREQ_SPECIAL_ROOT (1) /* * ioctl structures for v5 bulkstat and inumbers requests diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index f71341cd8340..3bb5f980fabf 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -961,6 +961,16 @@ xfs_ireq_setup( memchr_inv(hdr->reserved, 0, sizeof(hdr->reserved))) return -EINVAL; + if (hdr->flags & XFS_IREQ_SPECIAL) { + switch (hdr->ino) { + case XFS_IREQ_SPECIAL_ROOT: + hdr->ino = mp->m_sb.sb_rootino; + break; + default: + return -EINVAL; + } + } + if (XFS_INO_TO_AGNO(mp, hdr->ino) >= mp->m_sb.sb_agcount) return -EINVAL; |