xfs: add inode id filtering to eofblocks scan

Support inode ID filtering in the eofblocks scan. The caller must
set the associated XFS_EOF_FLAGS_*ID bit and ID field.
Signed-off-by: NBrian Foster <bfoster@redhat.com>
Reviewed-by: NMark Tinguely <tinguely@sgi.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NBen Myers <bpm@sgi.com>

fs/xfs/xfs_fs.h

@@ -346,13 +346,23 @@ typedef struct xfs_error_injection {
 struct xfs_eofblocks {
 	__u32		eof_version;
 	__u32		eof_flags;
-	__u64		pad[15];
+	uid_t		eof_uid;
+	gid_t		eof_gid;
+	prid_t		eof_prid;
+	__u32		pad32;
+	__u64		pad64[13];
 };
 
 /* eof_flags values */
 #define XFS_EOF_FLAGS_SYNC		(1 << 0) /* sync/wait mode scan */
+#define XFS_EOF_FLAGS_UID		(1 << 1) /* filter by uid */
+#define XFS_EOF_FLAGS_GID		(1 << 2) /* filter by gid */
+#define XFS_EOF_FLAGS_PRID		(1 << 3) /* filter by project id */
 #define XFS_EOF_FLAGS_VALID	\
-	(XFS_EOF_FLAGS_SYNC)
+	(XFS_EOF_FLAGS_SYNC |	\
+	 XFS_EOF_FLAGS_UID |	\
+	 XFS_EOF_FLAGS_GID |	\
+	 XFS_EOF_FLAGS_PRID)
 
 
 /*

fs/xfs/xfs_icache.c

@@ -1170,6 +1170,21 @@ xfs_reclaim_inodes_count(
 	return reclaimable;
 }
 
+STATIC int
+xfs_inode_match_id(
+	struct xfs_inode	*ip,
+	struct xfs_eofblocks	*eofb)
+{
+	if (eofb->eof_flags & XFS_EOF_FLAGS_UID)
+		return ip->i_d.di_uid == eofb->eof_uid;
+	else if (eofb->eof_flags & XFS_EOF_FLAGS_GID)
+		return ip->i_d.di_gid == eofb->eof_gid;
+	else if (eofb->eof_flags & XFS_EOF_FLAGS_PRID)
+		return xfs_get_projid(ip) == eofb->eof_prid;
+
+	return 0;
+}
+
 STATIC int
 xfs_inode_free_eofblocks(
 	struct xfs_inode	*ip,
@@ -1178,6 +1193,7 @@ xfs_inode_free_eofblocks(
 	void			*args)
 {
 	int ret;
+	struct xfs_eofblocks *eofb = args;
 
 	if (!xfs_can_free_eofblocks(ip, false)) {
 		/* inode could be preallocated or append-only */
@@ -1194,6 +1210,12 @@ xfs_inode_free_eofblocks(
 	    mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY))
 		return 0;
 
+	if (eofb &&
+	    (eofb->eof_flags & (XFS_EOF_FLAGS_UID|XFS_EOF_FLAGS_GID|
+			       XFS_EOF_FLAGS_PRID)) &&
+	    !xfs_inode_match_id(ip, eofb))
+		return 0;
+
 	ret = xfs_free_eofblocks(ip->i_mount, ip, true);
 
 	/* don't revisit the inode if we're not waiting */

fs/xfs/xfs_ioctl.c

@@ -1615,7 +1615,8 @@ xfs_file_ioctl(
 		if (eofb.eof_flags & ~XFS_EOF_FLAGS_VALID)
 			return -XFS_ERROR(EINVAL);
 
-		if (memchr_inv(eofb.pad, 0, sizeof(eofb.pad)))
+		if (memchr_inv(&eofb.pad32, 0, sizeof(eofb.pad32)) ||
+		    memchr_inv(eofb.pad64, 0, sizeof(eofb.pad64)))
 			return -XFS_ERROR(EINVAL);
 
 		error = xfs_icache_free_eofblocks(mp, &eofb);