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author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-04-30 06:36:53 +0200 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2017-04-30 06:36:53 +0200 |
commit | 0c9ec4beecac94cb450c8abb2ac8b7e8a79240ea (patch) | |
tree | 95dec5ec2bd1b53c425c29bc98e7506e41e4747e /fs/ext4/fsmap.h | |
parent | vfs: add common GETFSMAP ioctl definitions (diff) | |
download | linux-0c9ec4beecac94cb450c8abb2ac8b7e8a79240ea.tar.xz linux-0c9ec4beecac94cb450c8abb2ac8b7e8a79240ea.zip |
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.h | 69 |
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 --- /dev/null +++ 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__ */ |