UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity
OpenCloudOS-Kernel/fs/xfs/scrub/repair.h

92 lines
2.4 KiB
C
Raw Normal View History

xfs: convert to SPDX license tags Remove the verbose license text from XFS files and replace them with SPDX tags. This does not change the license of any of the code, merely refers to the common, up-to-date license files in LICENSES/ This change was mostly scripted. fs/xfs/Makefile and fs/xfs/libxfs/xfs_fs.h were modified by hand, the rest were detected and modified by the following command: for f in `git grep -l "GNU General" fs/xfs/` ; do echo $f cat $f | awk -f hdr.awk > $f.new mv -f $f.new $f done And the hdr.awk script that did the modification (including detecting the difference between GPL-2.0 and GPL-2.0+ licenses) is as follows: $ cat hdr.awk BEGIN { hdr = 1.0 tag = "GPL-2.0" str = "" } /^ \* This program is free software/ { hdr = 2.0; next } /any later version./ { tag = "GPL-2.0+" next } /^ \*\// { if (hdr > 0.0) { print "// SPDX-License-Identifier: " tag print str print $0 str="" hdr = 0.0 next } print $0 next } /^ \* / { if (hdr > 1.0) next if (hdr > 0.0) { if (str != "") str = str "\n" str = str $0 next } print $0 next } /^ \*/ { if (hdr > 0.0) next print $0 next } // { if (hdr > 0.0) { if (str != "") str = str "\n" str = str $0 next } print $0 } END { } $ Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2018-06-06 10:42:14 +08:00
// SPDX-License-Identifier: GPL-2.0+
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
/*
* Copyright (C) 2018 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#ifndef __XFS_SCRUB_REPAIR_H__
#define __XFS_SCRUB_REPAIR_H__
xfs: create xfs_dqtype_t to represent quota types Create a new type (xfs_dqtype_t) to represent the type of an incore dquot (user, group, project, or none). Rename the incore dquot's dq_flags field to q_type. This allows us to replace all the "uint type" arguments to the quota functions with "xfs_dqtype_t type", to make it obvious when we're passing a quota type argument into a function. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2020-07-16 08:53:43 +08:00
#include "xfs_quota_defs.h"
xfs: shorten struct xfs_scrub_context to struct xfs_scrub Shorten the name of the online fsck context structure. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:12 +08:00
static inline int xrep_notsupported(struct xfs_scrub *sc)
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
{
return -EOPNOTSUPP;
}
#ifdef CONFIG_XFS_ONLINE_REPAIR
/* Repair helpers */
xfs: get rid of the ip parameter to xchk_setup_* Now that the scrub context stores a pointer to the file that was used to invoke the scrub call, the struct xfs_inode pointer that we passed to all the setup functions is no longer necessary. This is only ever used if the caller wants us to scrub the metadata of the open file. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2021-04-08 08:59:39 +08:00
int xrep_attempt(struct xfs_scrub *sc);
xfs: shorten xfs_repair_ prefix to xrep_ Shorten all the metadata repair xfs_repair_* symbols to xrep_. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:11 +08:00
void xrep_failure(struct xfs_mount *mp);
xfs: shorten struct xfs_scrub_context to struct xfs_scrub Shorten the name of the online fsck context structure. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:12 +08:00
int xrep_roll_ag_trans(struct xfs_scrub *sc);
xfs: shorten xfs_repair_ prefix to xrep_ Shorten all the metadata repair xfs_repair_* symbols to xrep_. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:11 +08:00
bool xrep_ag_has_space(struct xfs_perag *pag, xfs_extlen_t nr_blocks,
xfs: add helpers to deal with transaction allocation and rolling For repairs, we need to reserve at least as many blocks as we think we're going to need to rebuild the data structure, and we're going to need some helpers to roll transactions while maintaining locks on the AG headers so that other threads cannot wander into the middle of a repair. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
2018-05-30 13:18:08 +08:00
enum xfs_ag_resv_type type);
xfs: shorten struct xfs_scrub_context to struct xfs_scrub Shorten the name of the online fsck context structure. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:12 +08:00
xfs_extlen_t xrep_calc_ag_resblks(struct xfs_scrub *sc);
xfs: const-ify xfs_owner_info arguments Only certain functions actually change the contents of an xfs_owner_info; the rest can accept a const struct pointer. This will enable us to save stack space by hoisting static owner info types to be const global variables. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-12-13 00:46:23 +08:00
int xrep_alloc_ag_block(struct xfs_scrub *sc,
const struct xfs_owner_info *oinfo, xfs_fsblock_t *fsbno,
enum xfs_ag_resv_type resv);
xfs: shorten struct xfs_scrub_context to struct xfs_scrub Shorten the name of the online fsck context structure. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:12 +08:00
int xrep_init_btblock(struct xfs_scrub *sc, xfs_fsblock_t fsb,
xfs: add helpers to allocate and initialize fresh btree roots Add a pair of helper functions to allocate and initialize fresh btree roots. The repair functions will use these as part of recreating corrupted metadata. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
2018-05-30 13:18:09 +08:00
struct xfs_buf **bpp, xfs_btnum_t btnum,
const struct xfs_buf_ops *ops);
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
xfs: rename xfs_bitmap to xbitmap Shorten the name of xfs_bitmap to xbitmap since the scrub bitmap has nothing to do with the libxfs bitmap. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2020-03-17 08:13:05 +08:00
struct xbitmap;
xfs: add helpers to collect and sift btree block pointers during repair Add some helpers to assemble a list of fs block extents. Generally, repair functions will iterate the rmapbt to make a list (1) of all extents owned by the nominal owner of the metadata structure; then they will iterate all other structures with the same rmap owner to make a list (2) of active blocks; and finally we have a subtraction function to subtract all the blocks in (2) from (1), with the result that (1) is now a list of blocks that were owned by the old btree and must be disposed. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:09 +08:00
xfs: shorten struct xfs_scrub_context to struct xfs_scrub Shorten the name of the online fsck context structure. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:12 +08:00
int xrep_fix_freelist(struct xfs_scrub *sc, bool can_shrink);
xfs: rename xfs_bitmap to xbitmap Shorten the name of xfs_bitmap to xbitmap since the scrub bitmap has nothing to do with the libxfs bitmap. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2020-03-17 08:13:05 +08:00
int xrep_invalidate_blocks(struct xfs_scrub *sc, struct xbitmap *btlist);
int xrep_reap_extents(struct xfs_scrub *sc, struct xbitmap *exlist,
xfs: const-ify xfs_owner_info arguments Only certain functions actually change the contents of an xfs_owner_info; the rest can accept a const struct pointer. This will enable us to save stack space by hoisting static owner info types to be const global variables. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-12-13 00:46:23 +08:00
const struct xfs_owner_info *oinfo, enum xfs_ag_resv_type type);
xfs: add helpers to collect and sift btree block pointers during repair Add some helpers to assemble a list of fs block extents. Generally, repair functions will iterate the rmapbt to make a list (1) of all extents owned by the nominal owner of the metadata structure; then they will iterate all other structures with the same rmap owner to make a list (2) of active blocks; and finally we have a subtraction function to subtract all the blocks in (2) from (1), with the result that (1) is now a list of blocks that were owned by the old btree and must be disposed. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:09 +08:00
xfs: shorten xfs_repair_ prefix to xrep_ Shorten all the metadata repair xfs_repair_* symbols to xrep_. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:11 +08:00
struct xrep_find_ag_btree {
xfs: recover AG btree roots from rmap data Add a helper function to help us recover btree roots from the rmap data. Callers pass in a list of rmap owner codes, buffer ops, and magic numbers. We iterate the rmap records looking for owner matches, and then read the matching blocks to see if the magic number & uuid match. If so, we then read-verify the block, and if that passes then we retain a pointer to the block with the highest level, assuming that by the end of the call we will have found the root. This will be used to reset the AGF/AGI btree root fields during their rebuild procedures. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:10 +08:00
/* in: rmap owner of the btree we're looking for */
uint64_t rmap_owner;
/* in: buffer ops */
const struct xfs_buf_ops *buf_ops;
/* out: the highest btree block found and the tree height */
xfs_agblock_t root;
unsigned int height;
};
xfs: fix indentation and other whitespace problems in scrub/repair Now that we've shortened everything, fix up all the indentation and whitespace problems. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:12 +08:00
int xrep_find_ag_btree_roots(struct xfs_scrub *sc, struct xfs_buf *agf_bp,
struct xrep_find_ag_btree *btree_info, struct xfs_buf *agfl_bp);
xfs: create xfs_dqtype_t to represent quota types Create a new type (xfs_dqtype_t) to represent the type of an incore dquot (user, group, project, or none). Rename the incore dquot's dq_flags field to q_type. This allows us to replace all the "uint type" arguments to the quota functions with "xfs_dqtype_t type", to make it obvious when we're passing a quota type argument into a function. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2020-07-16 08:53:43 +08:00
void xrep_force_quotacheck(struct xfs_scrub *sc, xfs_dqtype_t type);
xfs: shorten struct xfs_scrub_context to struct xfs_scrub Shorten the name of the online fsck context structure. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:12 +08:00
int xrep_ino_dqattach(struct xfs_scrub *sc);
xfs: recover AG btree roots from rmap data Add a helper function to help us recover btree roots from the rmap data. Callers pass in a list of rmap owner codes, buffer ops, and magic numbers. We iterate the rmap records looking for owner matches, and then read the matching blocks to see if the magic number & uuid match. If so, we then read-verify the block, and if that passes then we retain a pointer to the block with the highest level, assuming that by the end of the call we will have found the root. This will be used to reset the AGF/AGI btree root fields during their rebuild procedures. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:18:10 +08:00
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
/* Metadata repairers */
xfs: shorten struct xfs_scrub_context to struct xfs_scrub Shorten the name of the online fsck context structure. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:12 +08:00
int xrep_probe(struct xfs_scrub *sc);
int xrep_superblock(struct xfs_scrub *sc);
xfs: repair the AGF Regenerate the AGF from the rmap data. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-08-10 13:42:53 +08:00
int xrep_agf(struct xfs_scrub *sc);
xfs: repair the AGFL Repair the AGFL from the rmap data. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-08-10 13:43:02 +08:00
int xrep_agfl(struct xfs_scrub *sc);
xfs: repair the AGI Rebuild the AGI header items with some help from the rmapbt. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-08-10 13:43:04 +08:00
int xrep_agi(struct xfs_scrub *sc);
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
#else
xfs: get rid of the ip parameter to xchk_setup_* Now that the scrub context stores a pointer to the file that was used to invoke the scrub call, the struct xfs_inode pointer that we passed to all the setup functions is no longer necessary. This is only ever used if the caller wants us to scrub the metadata of the open file. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2021-04-08 08:59:39 +08:00
static inline int
xrep_attempt(
xfs: hoist the already_fixed variable to the scrub context Now that we no longer memset the scrub context, we can move the already_fixed variable into the scrub context's state flags instead of passing around pointers to separate stack variables. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2019-04-16 23:22:00 +08:00
struct xfs_scrub *sc)
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
{
return -EOPNOTSUPP;
}
xfs: shorten xfs_repair_ prefix to xrep_ Shorten all the metadata repair xfs_repair_* symbols to xrep_. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:11 +08:00
static inline void xrep_failure(struct xfs_mount *mp) {}
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
xfs: add helpers to deal with transaction allocation and rolling For repairs, we need to reserve at least as many blocks as we think we're going to need to rebuild the data structure, and we're going to need some helpers to roll transactions while maintaining locks on the AG headers so that other threads cannot wander into the middle of a repair. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
2018-05-30 13:18:08 +08:00
static inline xfs_extlen_t
xfs: shorten xfs_repair_ prefix to xrep_ Shorten all the metadata repair xfs_repair_* symbols to xrep_. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:11 +08:00
xrep_calc_ag_resblks(
xfs: shorten struct xfs_scrub_context to struct xfs_scrub Shorten the name of the online fsck context structure. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:12 +08:00
struct xfs_scrub *sc)
xfs: add helpers to deal with transaction allocation and rolling For repairs, we need to reserve at least as many blocks as we think we're going to need to rebuild the data structure, and we're going to need some helpers to roll transactions while maintaining locks on the AG headers so that other threads cannot wander into the middle of a repair. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
2018-05-30 13:18:08 +08:00
{
return 0;
}
xfs: shorten xfs_repair_ prefix to xrep_ Shorten all the metadata repair xfs_repair_* symbols to xrep_. Whitespace damage will be fixed by a subsequent patch. There are no functional changes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-07-20 03:29:11 +08:00
#define xrep_probe xrep_notsupported
#define xrep_superblock xrep_notsupported
xfs: repair the AGF Regenerate the AGF from the rmap data. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-08-10 13:42:53 +08:00
#define xrep_agf xrep_notsupported
xfs: repair the AGFL Repair the AGFL from the rmap data. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-08-10 13:43:02 +08:00
#define xrep_agfl xrep_notsupported
xfs: repair the AGI Rebuild the AGI header items with some help from the rmapbt. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-08-10 13:43:04 +08:00
#define xrep_agi xrep_notsupported
xfs: implement the metadata repair ioctl flag Plumb in the pieces necessary to make the "scrub" subfunction of the scrub ioctl actually work. This means that we make the IFLAG_REPAIR flag to the scrub ioctl actually do something, and we add an errortag knob so that xfstests can force the kernel to rebuild a metadata structure even if there's nothing wrong with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-14 21:34:36 +08:00
#endif /* CONFIG_XFS_ONLINE_REPAIR */
#endif /* __XFS_SCRUB_REPAIR_H__ */