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OpenCloudOS-Kernel/fs/xfs/scrub/common.h

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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: probe the scrub ioctl Create a probe scrubber with id 0. This will be used by xfs_scrub to probe the kernel's abilities to scrub (and repair) the metadata. We do this by validating the ioctl inputs from userspace, preparing the filesystem for a scrub (or a repair) operation, and immediately returning to userspace. Userspace can use the returned errno and structure state to decide (in broad terms) if scrub/repair are supported by the running kernel. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
/*
* Copyright (C) 2017 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#ifndef __XFS_SCRUB_COMMON_H__
#define __XFS_SCRUB_COMMON_H__
/*
* We /could/ terminate a scrub/repair operation early. If we're not
* in a good place to continue (fatal signal, etc.) then bail out.
* Note that we're careful not to make any judgements about *error.
*/
static inline bool
xfs_scrub_should_terminate(
struct xfs_scrub_context *sc,
int *error)
{
if (fatal_signal_pending(current)) {
if (*error == 0)
*error = -EAGAIN;
return true;
}
return false;
}
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
int xfs_scrub_trans_alloc(struct xfs_scrub_context *sc, uint resblks);
xfs: create helpers to record and deal with scrub problems Create helper functions to record crc and corruption problems, and deal with any other runtime errors that arise. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
bool xfs_scrub_process_error(struct xfs_scrub_context *sc, xfs_agnumber_t agno,
xfs_agblock_t bno, int *error);
bool xfs_scrub_fblock_process_error(struct xfs_scrub_context *sc, int whichfork,
xfs_fileoff_t offset, int *error);
xfs: set up scrub cross-referencing helpers Create some helper functions that we'll use later to deal with problems we might encounter while cross referencing metadata with other metadata. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-01-17 10:52:14 +08:00
bool xfs_scrub_xref_process_error(struct xfs_scrub_context *sc,
xfs_agnumber_t agno, xfs_agblock_t bno, int *error);
bool xfs_scrub_fblock_xref_process_error(struct xfs_scrub_context *sc,
int whichfork, xfs_fileoff_t offset, int *error);
xfs: create helpers to record and deal with scrub problems Create helper functions to record crc and corruption problems, and deal with any other runtime errors that arise. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
void xfs_scrub_block_set_preen(struct xfs_scrub_context *sc,
struct xfs_buf *bp);
xfs: remove xfs_buf parameter from inode scrub methods Now that we no longer do raw inode buffer scrubbing, the bp parameter is no longer used anywhere we're dealing with an inode, so remove it and all the useless NULL parameters that go with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-03-24 01:06:54 +08:00
void xfs_scrub_ino_set_preen(struct xfs_scrub_context *sc, xfs_ino_t ino);
xfs: create helpers to record and deal with scrub problems Create helper functions to record crc and corruption problems, and deal with any other runtime errors that arise. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
void xfs_scrub_block_set_corrupt(struct xfs_scrub_context *sc,
struct xfs_buf *bp);
xfs: remove xfs_buf parameter from inode scrub methods Now that we no longer do raw inode buffer scrubbing, the bp parameter is no longer used anywhere we're dealing with an inode, so remove it and all the useless NULL parameters that go with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-03-24 01:06:54 +08:00
void xfs_scrub_ino_set_corrupt(struct xfs_scrub_context *sc, xfs_ino_t ino);
xfs: create helpers to record and deal with scrub problems Create helper functions to record crc and corruption problems, and deal with any other runtime errors that arise. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
void xfs_scrub_fblock_set_corrupt(struct xfs_scrub_context *sc, int whichfork,
xfs_fileoff_t offset);
xfs: set up scrub cross-referencing helpers Create some helper functions that we'll use later to deal with problems we might encounter while cross referencing metadata with other metadata. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-01-17 10:52:14 +08:00
void xfs_scrub_block_xref_set_corrupt(struct xfs_scrub_context *sc,
struct xfs_buf *bp);
xfs: remove xfs_buf parameter from inode scrub methods Now that we no longer do raw inode buffer scrubbing, the bp parameter is no longer used anywhere we're dealing with an inode, so remove it and all the useless NULL parameters that go with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-03-24 01:06:54 +08:00
void xfs_scrub_ino_xref_set_corrupt(struct xfs_scrub_context *sc,
xfs_ino_t ino);
xfs: set up scrub cross-referencing helpers Create some helper functions that we'll use later to deal with problems we might encounter while cross referencing metadata with other metadata. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-01-17 10:52:14 +08:00
void xfs_scrub_fblock_xref_set_corrupt(struct xfs_scrub_context *sc,
int whichfork, xfs_fileoff_t offset);
xfs: remove xfs_buf parameter from inode scrub methods Now that we no longer do raw inode buffer scrubbing, the bp parameter is no longer used anywhere we're dealing with an inode, so remove it and all the useless NULL parameters that go with it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-03-24 01:06:54 +08:00
void xfs_scrub_ino_set_warning(struct xfs_scrub_context *sc, xfs_ino_t ino);
xfs: create helpers to record and deal with scrub problems Create helper functions to record crc and corruption problems, and deal with any other runtime errors that arise. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
void xfs_scrub_fblock_set_warning(struct xfs_scrub_context *sc, int whichfork,
xfs_fileoff_t offset);
void xfs_scrub_set_incomplete(struct xfs_scrub_context *sc);
xfs: scrub inode btrees Check the records of the inode btrees to make sure that the values make sense given the inode records themselves. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:40 +08:00
int xfs_scrub_checkpoint_log(struct xfs_mount *mp);
xfs: create helpers to record and deal with scrub problems Create helper functions to record crc and corruption problems, and deal with any other runtime errors that arise. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
xfs: set up scrub cross-referencing helpers Create some helper functions that we'll use later to deal with problems we might encounter while cross referencing metadata with other metadata. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-01-17 10:52:14 +08:00
/* Are we set up for a cross-referencing check? */
bool xfs_scrub_should_check_xref(struct xfs_scrub_context *sc, int *error,
struct xfs_btree_cur **curpp);
xfs: probe the scrub ioctl Create a probe scrubber with id 0. This will be used by xfs_scrub to probe the kernel's abilities to scrub (and repair) the metadata. We do this by validating the ioctl inputs from userspace, preparing the filesystem for a scrub (or a repair) operation, and immediately returning to userspace. Userspace can use the returned errno and structure state to decide (in broad terms) if scrub/repair are supported by the running kernel. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
/* Setup functions */
int xfs_scrub_setup_fs(struct xfs_scrub_context *sc, struct xfs_inode *ip);
xfs: scrub free space btrees Check the extent records free space btrees to ensure that the values look sane. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:40 +08:00
int xfs_scrub_setup_ag_allocbt(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub inode btrees Check the records of the inode btrees to make sure that the values make sense given the inode records themselves. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:40 +08:00
int xfs_scrub_setup_ag_iallocbt(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub rmap btrees Check the reverse mapping records to make sure that the contents make sense. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:41 +08:00
int xfs_scrub_setup_ag_rmapbt(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub refcount btrees Plumb in the pieces necessary to check the refcount btree. If rmap is available, check the reference count by performing an interval query against the rmapbt. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:41 +08:00
int xfs_scrub_setup_ag_refcountbt(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub inodes Scrub the fields within an inode. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:42 +08:00
int xfs_scrub_setup_inode(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub inode block mappings Scrub an individual inode's block mappings to make sure they make sense. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:43 +08:00
int xfs_scrub_setup_inode_bmap(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
int xfs_scrub_setup_inode_bmap_data(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub directory metadata Scrub the hash tree and all the entries in a directory. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:44 +08:00
int xfs_scrub_setup_directory(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub extended attributes Scrub the hash tree, keys, and values in an extended attribute structure. Refactor the attribute code to use the transaction if the caller supplied one to avoid buffer deadocks. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:45 +08:00
int xfs_scrub_setup_xattr(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub symbolic links Create the infrastructure to scrub symbolic link data. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:45 +08:00
int xfs_scrub_setup_symlink(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub directory parent pointers Scrub parent pointers, sort of. For directories, we can ride the '..' entry up to the parent to confirm that there's at most one dentry that points back to this directory. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:46 +08:00
int xfs_scrub_setup_parent(struct xfs_scrub_context *sc,
struct xfs_inode *ip);
xfs: scrub realtime bitmap/summary Perform simple tests of the realtime bitmap and summary. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:46 +08:00
#ifdef CONFIG_XFS_RT
int xfs_scrub_setup_rt(struct xfs_scrub_context *sc, struct xfs_inode *ip);
#else
static inline int
xfs_scrub_setup_rt(struct xfs_scrub_context *sc, struct xfs_inode *ip)
xfs: scrub quota information Perform some quick sanity testing of the disk quota information. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:47 +08:00
{
return -ENOENT;
}
#endif
#ifdef CONFIG_XFS_QUOTA
int xfs_scrub_setup_quota(struct xfs_scrub_context *sc, struct xfs_inode *ip);
#else
static inline int
xfs_scrub_setup_quota(struct xfs_scrub_context *sc, struct xfs_inode *ip)
xfs: scrub realtime bitmap/summary Perform simple tests of the realtime bitmap and summary. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:46 +08:00
{
return -ENOENT;
}
#endif
xfs: probe the scrub ioctl Create a probe scrubber with id 0. This will be used by xfs_scrub to probe the kernel's abilities to scrub (and repair) the metadata. We do this by validating the ioctl inputs from userspace, preparing the filesystem for a scrub (or a repair) operation, and immediately returning to userspace. Userspace can use the returned errno and structure state to decide (in broad terms) if scrub/repair are supported by the running kernel. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
xfs: create helpers to scan an allocation group Add some helpers to enable us to lock an AG's headers, create btree cursors for all btrees in that allocation group, and clean up afterwards. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:38 +08:00
void xfs_scrub_ag_free(struct xfs_scrub_context *sc, struct xfs_scrub_ag *sa);
int xfs_scrub_ag_init(struct xfs_scrub_context *sc, xfs_agnumber_t agno,
struct xfs_scrub_ag *sa);
xfs: grab the per-ag structure whenever relevant Grab and hold the per-AG data across a scrub run whenever relevant. This helps us avoid repeated trips through rcu and the radix tree in the repair code. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-05-30 13:24:44 +08:00
void xfs_scrub_perag_get(struct xfs_mount *mp, struct xfs_scrub_ag *sa);
xfs: create helpers to scan an allocation group Add some helpers to enable us to lock an AG's headers, create btree cursors for all btrees in that allocation group, and clean up afterwards. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:38 +08:00
int xfs_scrub_ag_read_headers(struct xfs_scrub_context *sc, xfs_agnumber_t agno,
struct xfs_buf **agi, struct xfs_buf **agf,
struct xfs_buf **agfl);
void xfs_scrub_ag_btcur_free(struct xfs_scrub_ag *sa);
int xfs_scrub_ag_btcur_init(struct xfs_scrub_context *sc,
struct xfs_scrub_ag *sa);
xfs: cross-reference reverse-mapping btree When scrubbing various btrees, we should cross-reference the records with the reverse mapping btree and ensure that traversing the btree finds the same number of blocks that the rmapbt thinks are owned by that btree. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-01-17 10:53:08 +08:00
int xfs_scrub_count_rmap_ownedby_ag(struct xfs_scrub_context *sc,
struct xfs_btree_cur *cur,
struct xfs_owner_info *oinfo,
xfs_filblks_t *blocks);
xfs: create helpers to scan an allocation group Add some helpers to enable us to lock an AG's headers, create btree cursors for all btrees in that allocation group, and clean up afterwards. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:38 +08:00
xfs: scrub free space btrees Check the extent records free space btrees to ensure that the values look sane. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:40 +08:00
int xfs_scrub_setup_ag_btree(struct xfs_scrub_context *sc,
struct xfs_inode *ip, bool force_log);
xfs: scrub inodes Scrub the fields within an inode. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:42 +08:00
int xfs_scrub_get_inode(struct xfs_scrub_context *sc, struct xfs_inode *ip_in);
xfs: scrub directory metadata Scrub the hash tree and all the entries in a directory. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:44 +08:00
int xfs_scrub_setup_inode_contents(struct xfs_scrub_context *sc,
struct xfs_inode *ip, unsigned int resblks);
xfs: scrub in-core metadata Whenever we load a buffer, explicitly re-call the structure verifier to ensure that memory isn't corrupting things. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-01-17 10:53:11 +08:00
void xfs_scrub_buffer_recheck(struct xfs_scrub_context *sc, struct xfs_buf *bp);
xfs: scrub free space btrees Check the extent records free space btrees to ensure that the values look sane. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:40 +08:00
xfs: skip scrub xref if corruption already noted Don't bother looking for cross-referencing problems if the metadata is already corrupt or we've already found a cross-referencing problem. Since we added a helper function for flags testing, convert existing users to use it. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-05-14 21:34:31 +08:00
/*
* Don't bother cross-referencing if we already found corruption or cross
* referencing discrepancies.
*/
static inline bool xfs_scrub_skip_xref(struct xfs_scrub_metadata *sm)
{
return sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
XFS_SCRUB_OFLAG_XCORRUPT);
}
xfs: quota scrub should use bmapbtd scrubber Replace the quota scrubber's open-coded data fork scrubber with a redirected call to the bmapbtd scrubber. This strengthens the quota scrub to include all the cross-referencing that it does. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-05-14 21:34:33 +08:00
int xfs_scrub_metadata_inode_forks(struct xfs_scrub_context *sc);
xfs: avoid ABBA deadlock when scrubbing parent pointers In normal operation, the XFS convention is to take an inode's iolock and then allocate a transaction. However, when scrubbing parent inodes this is inverted -- we allocated the transaction to do the scrub, and now we're trying to grab the parent's iolock. This can lead to ABBA deadlocks: some thread grabbed the parent's iolock and is waiting for space for a transaction while our parent scrubber is sitting on a transaction trying to get the parent's iolock. Therefore, convert all iolock attempts to use trylock; if that fails, they can use the existing mechanisms to back off and try again. The ABBA deadlock didn't happen with a non-repair scrub because the transactions don't reserve any space, but repair scrubs require reservation in order to update metadata. However, any other concurrent metadata update (e.g. directory create in the parent) could also induce this deadlock with the parent scrubber. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-05-14 21:34:34 +08:00
int xfs_scrub_ilock_inverted(struct xfs_inode *ip, uint lock_mode);
xfs: quota scrub should use bmapbtd scrubber Replace the quota scrubber's open-coded data fork scrubber with a redirected call to the bmapbtd scrubber. This strengthens the quota scrub to include all the cross-referencing that it does. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
2018-05-14 21:34:33 +08:00
xfs: probe the scrub ioctl Create a probe scrubber with id 0. This will be used by xfs_scrub to probe the kernel's abilities to scrub (and repair) the metadata. We do this by validating the ioctl inputs from userspace, preparing the filesystem for a scrub (or a repair) operation, and immediately returning to userspace. Userspace can use the returned errno and structure state to decide (in broad terms) if scrub/repair are supported by the running kernel. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2017-10-18 12:37:36 +08:00
#endif /* __XFS_SCRUB_COMMON_H__ */