[PATCH v5 08/10] xfs: add quota id filtering to eofblocks scan

[Brian Foster]

Support quota ID filtering in the eofblocks scan. The caller must
set the XFS_EOF_FLAGS_QUOTA flags bit, quota ID and quota type. The
associated quota type must be enabled on the mounted filesystem.

Signed-off-by: Brian Foster <bfoster at redhat.com>
---
 fs/xfs/xfs_fs.h     |    3 +++
 fs/xfs/xfs_icache.c |   24 ++++++++++++++++++++++++
 fs/xfs/xfs_ioctl.c  |    8 ++++++++
 3 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/fs/xfs/xfs_fs.h b/fs/xfs/xfs_fs.h
index 5f48b3e..6ef9111 100644
--- a/fs/xfs/xfs_fs.h
+++ b/fs/xfs/xfs_fs.h
@@ -345,11 +345,14 @@ typedef struct xfs_error_injection {
 struct xfs_eofblocks {
 	__u32		eof_version;
 	__u32		eof_flags;
+	__u32		eof_q_id;
+	__u32		eof_q_type;
 	unsigned char	pad[12];
 };
 
 /* eof_flags values */
 #define XFS_EOF_FLAGS_SYNC		0x01	/* sync/wait mode scan */
+#define XFS_EOF_FLAGS_QUOTA		0x02	/* filter by quota id */
 
 
 /*
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 35efdda..b39970b 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -1171,6 +1171,22 @@ xfs_reclaim_inodes_count(
 }
 
 STATIC int
+xfs_inode_match_quota_id(
+	struct xfs_inode	*ip,
+	struct xfs_eofblocks	*eofb)
+{
+	unsigned int type = xfs_quota_type(eofb->eof_q_type);
+	if (type == XFS_DQ_USER)
+		return ip->i_d.di_uid == eofb->eof_q_id;
+	else if (type == XFS_DQ_GROUP)
+		return ip->i_d.di_gid == eofb->eof_q_id;
+	else if (type == XFS_DQ_PROJ)
+		return xfs_get_projid(ip) == eofb->eof_q_id;
+
+	return 0;
+}
+
+STATIC int
 xfs_inode_free_eofblocks(
 	struct xfs_inode	*ip,
 	struct xfs_perag	*pag,
@@ -1178,6 +1194,7 @@ 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 +1211,13 @@ xfs_inode_free_eofblocks(
 	    mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY))
 		return 0;
 
+	if (eofb) {
+		/* filter by quota id */
+		if (eofb->eof_flags & XFS_EOF_FLAGS_QUOTA &&
+		    !xfs_inode_match_quota_id(ip, eofb))
+			return 0;
+	}
+
 	ret = xfs_free_eofblocks(ip->i_mount, ip, true);
 
 	/* don't revisit the inode if we're not waiting */
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index ad4352f..547363b 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1613,6 +1613,14 @@ xfs_file_ioctl(
 		if (eofb.eof_version != XFS_EOFBLOCKS_VERSION)
 			return -XFS_ERROR(EINVAL);
 
+		if (eofb.eof_flags & XFS_EOF_FLAGS_QUOTA) {
+			unsigned int type = xfs_quota_type(eofb.eof_q_type);
+			if ((type == XFS_DQ_USER && !XFS_IS_UQUOTA_ON(mp)) ||
+			    (type == XFS_DQ_GROUP && !XFS_IS_GQUOTA_ON(mp)) ||
+			    (type == XFS_DQ_PROJ && !XFS_IS_PQUOTA_ON(mp)))
+				return -XFS_ERROR(EINVAL);
+		}
+
 		flags = (eofb.eof_flags & XFS_EOF_FLAGS_SYNC) ? SYNC_WAIT : SYNC_TRYLOCK;
 		error = xfs_icache_free_eofblocks(mp, flags, &eofb);
 		return -error;
-- 
1.7.7.6