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authorDarrick J. Wong <darrick.wong@oracle.com>2017-04-30 00:36:53 -0400
committerTheodore Ts'o <tytso@mit.edu>2017-04-30 00:36:53 -0400
commit0c9ec4beecac94cb450c8abb2ac8b7e8a79240ea (patch)
tree95dec5ec2bd1b53c425c29bc98e7506e41e4747e /fs/ext4/fsmap.h
parentd0649f0416feb616d34d15e541716cb8a555e899 (diff)
downloadlinux-0c9ec4beecac94cb450c8abb2ac8b7e8a79240ea.tar.bz2
ext4: support GETFSMAP ioctls
Support the GETFSMAP ioctls so that we can use the xfs free space management tools to probe ext4 as well. Note that this is a partial implementation -- we only report fixed-location metadata and free space; everything else is reported as "unknown". Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/fsmap.h')
-rw-r--r--fs/ext4/fsmap.h69
1 files changed, 69 insertions, 0 deletions
diff --git a/fs/ext4/fsmap.h b/fs/ext4/fsmap.h
new file mode 100644
index 000000000000..9a2cd367cc66
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+++ b/fs/ext4/fsmap.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2017 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#ifndef __EXT4_FSMAP_H__
+#define __EXT4_FSMAP_H__
+
+struct fsmap;
+
+/* internal fsmap representation */
+struct ext4_fsmap {
+ struct list_head fmr_list;
+ dev_t fmr_device; /* device id */
+ uint32_t fmr_flags; /* mapping flags */
+ uint64_t fmr_physical; /* device offset of segment */
+ uint64_t fmr_owner; /* owner id */
+ uint64_t fmr_length; /* length of segment, blocks */
+};
+
+struct ext4_fsmap_head {
+ uint32_t fmh_iflags; /* control flags */
+ uint32_t fmh_oflags; /* output flags */
+ unsigned int fmh_count; /* # of entries in array incl. input */
+ unsigned int fmh_entries; /* # of entries filled in (output). */
+
+ struct ext4_fsmap fmh_keys[2]; /* low and high keys */
+};
+
+void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
+ struct ext4_fsmap *src);
+void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
+ struct fsmap *src);
+
+/* fsmap to userspace formatter - copy to user & advance pointer */
+typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *);
+
+int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
+ ext4_fsmap_format_t formatter, void *arg);
+
+#define EXT4_QUERY_RANGE_ABORT 1
+#define EXT4_QUERY_RANGE_CONTINUE 0
+
+/* fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */
+#define EXT4_FMR_OWN_FREE FMR_OWN_FREE /* free space */
+#define EXT4_FMR_OWN_UNKNOWN FMR_OWN_UNKNOWN /* unknown owner */
+#define EXT4_FMR_OWN_FS FMR_OWNER('X', 1) /* static fs metadata */
+#define EXT4_FMR_OWN_LOG FMR_OWNER('X', 2) /* journalling log */
+#define EXT4_FMR_OWN_INODES FMR_OWNER('X', 5) /* inodes */
+#define EXT4_FMR_OWN_GDT FMR_OWNER('f', 1) /* group descriptors */
+#define EXT4_FMR_OWN_RESV_GDT FMR_OWNER('f', 2) /* reserved gdt blocks */
+#define EXT4_FMR_OWN_BLKBM FMR_OWNER('f', 3) /* inode bitmap */
+#define EXT4_FMR_OWN_INOBM FMR_OWNER('f', 4) /* block bitmap */
+
+#endif /* __EXT4_FSMAP_H__ */