[PATCH v6 07/10] xfs: add inode id filtering to eofblocks scan

[Brian Foster <bfoster@xxxxxxxxxx>]

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: Brian Foster <bfoster@xxxxxxxxxx>
---
 fs/xfs/xfs_fs.h     |   11 +++++++++--
 fs/xfs/xfs_icache.c |   22 ++++++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_fs.h b/fs/xfs/xfs_fs.h
index 26ff43a..88eb1bc 100644
--- a/fs/xfs/xfs_fs.h
+++ b/fs/xfs/xfs_fs.h
@@ -345,13 +345,20 @@ 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           pad[27];
 };
 
 /* 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)
 
 
 /*
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index d0d9273..699d1b0 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -1171,6 +1171,21 @@ xfs_reclaim_inodes_count(
 }
 
 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,
        struct xfs_perag        *pag,
@@ -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 */
-- 
1.7.7.6