mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 02:16:39 +07:00
568d994e9f
We might not have read in the extent list at this point, so make sure we take the ilock exclusively if we have to do so. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Ben Myers <bpm@sgi.com>
652 lines
16 KiB
C
652 lines
16 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* Copyright (c) 2013 Red Hat, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_inode_item.h"
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#include "xfs_bmap.h"
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#include "xfs_attr.h"
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#include "xfs_attr_sf.h"
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#include "xfs_attr_remote.h"
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#include "xfs_attr_leaf.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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#include "xfs_buf_item.h"
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#include "xfs_cksum.h"
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#include "xfs_dinode.h"
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#include "xfs_dir2.h"
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STATIC int
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xfs_attr_shortform_compare(const void *a, const void *b)
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{
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xfs_attr_sf_sort_t *sa, *sb;
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sa = (xfs_attr_sf_sort_t *)a;
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sb = (xfs_attr_sf_sort_t *)b;
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if (sa->hash < sb->hash) {
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return(-1);
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} else if (sa->hash > sb->hash) {
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return(1);
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} else {
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return(sa->entno - sb->entno);
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}
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}
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#define XFS_ISRESET_CURSOR(cursor) \
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(!((cursor)->initted) && !((cursor)->hashval) && \
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!((cursor)->blkno) && !((cursor)->offset))
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/*
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* Copy out entries of shortform attribute lists for attr_list().
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* Shortform attribute lists are not stored in hashval sorted order.
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* If the output buffer is not large enough to hold them all, then we
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* we have to calculate each entries' hashvalue and sort them before
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* we can begin returning them to the user.
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*/
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int
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xfs_attr_shortform_list(xfs_attr_list_context_t *context)
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{
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attrlist_cursor_kern_t *cursor;
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xfs_attr_sf_sort_t *sbuf, *sbp;
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xfs_attr_shortform_t *sf;
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xfs_attr_sf_entry_t *sfe;
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xfs_inode_t *dp;
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int sbsize, nsbuf, count, i;
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int error;
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ASSERT(context != NULL);
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dp = context->dp;
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ASSERT(dp != NULL);
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ASSERT(dp->i_afp != NULL);
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sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
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ASSERT(sf != NULL);
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if (!sf->hdr.count)
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return(0);
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cursor = context->cursor;
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ASSERT(cursor != NULL);
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trace_xfs_attr_list_sf(context);
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/*
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* If the buffer is large enough and the cursor is at the start,
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* do not bother with sorting since we will return everything in
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* one buffer and another call using the cursor won't need to be
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* made.
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* Note the generous fudge factor of 16 overhead bytes per entry.
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* If bufsize is zero then put_listent must be a search function
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* and can just scan through what we have.
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*/
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if (context->bufsize == 0 ||
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(XFS_ISRESET_CURSOR(cursor) &&
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(dp->i_afp->if_bytes + sf->hdr.count * 16) < context->bufsize)) {
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for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
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error = context->put_listent(context,
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sfe->flags,
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sfe->nameval,
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(int)sfe->namelen,
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(int)sfe->valuelen,
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&sfe->nameval[sfe->namelen]);
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/*
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* Either search callback finished early or
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* didn't fit it all in the buffer after all.
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*/
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if (context->seen_enough)
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break;
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if (error)
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return error;
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sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
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}
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trace_xfs_attr_list_sf_all(context);
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return(0);
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}
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/* do no more for a search callback */
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if (context->bufsize == 0)
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return 0;
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/*
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* It didn't all fit, so we have to sort everything on hashval.
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*/
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sbsize = sf->hdr.count * sizeof(*sbuf);
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sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP | KM_NOFS);
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/*
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* Scan the attribute list for the rest of the entries, storing
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* the relevant info from only those that match into a buffer.
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*/
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nsbuf = 0;
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for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
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if (unlikely(
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((char *)sfe < (char *)sf) ||
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((char *)sfe >= ((char *)sf + dp->i_afp->if_bytes)))) {
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XFS_CORRUPTION_ERROR("xfs_attr_shortform_list",
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XFS_ERRLEVEL_LOW,
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context->dp->i_mount, sfe);
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kmem_free(sbuf);
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return XFS_ERROR(EFSCORRUPTED);
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}
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sbp->entno = i;
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sbp->hash = xfs_da_hashname(sfe->nameval, sfe->namelen);
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sbp->name = sfe->nameval;
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sbp->namelen = sfe->namelen;
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/* These are bytes, and both on-disk, don't endian-flip */
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sbp->valuelen = sfe->valuelen;
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sbp->flags = sfe->flags;
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sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
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sbp++;
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nsbuf++;
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}
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/*
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* Sort the entries on hash then entno.
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*/
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xfs_sort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare);
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/*
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* Re-find our place IN THE SORTED LIST.
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*/
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count = 0;
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cursor->initted = 1;
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cursor->blkno = 0;
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for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) {
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if (sbp->hash == cursor->hashval) {
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if (cursor->offset == count) {
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break;
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}
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count++;
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} else if (sbp->hash > cursor->hashval) {
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break;
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}
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}
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if (i == nsbuf) {
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kmem_free(sbuf);
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return(0);
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}
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/*
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* Loop putting entries into the user buffer.
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*/
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for ( ; i < nsbuf; i++, sbp++) {
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if (cursor->hashval != sbp->hash) {
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cursor->hashval = sbp->hash;
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cursor->offset = 0;
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}
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error = context->put_listent(context,
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sbp->flags,
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sbp->name,
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sbp->namelen,
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sbp->valuelen,
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&sbp->name[sbp->namelen]);
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if (error)
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return error;
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if (context->seen_enough)
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break;
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cursor->offset++;
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}
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kmem_free(sbuf);
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return(0);
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}
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STATIC int
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xfs_attr_node_list(xfs_attr_list_context_t *context)
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{
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attrlist_cursor_kern_t *cursor;
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xfs_attr_leafblock_t *leaf;
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xfs_da_intnode_t *node;
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struct xfs_attr3_icleaf_hdr leafhdr;
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struct xfs_da3_icnode_hdr nodehdr;
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struct xfs_da_node_entry *btree;
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int error, i;
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struct xfs_buf *bp;
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struct xfs_inode *dp = context->dp;
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trace_xfs_attr_node_list(context);
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cursor = context->cursor;
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cursor->initted = 1;
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/*
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* Do all sorts of validation on the passed-in cursor structure.
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* If anything is amiss, ignore the cursor and look up the hashval
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* starting from the btree root.
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*/
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bp = NULL;
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if (cursor->blkno > 0) {
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error = xfs_da3_node_read(NULL, dp, cursor->blkno, -1,
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&bp, XFS_ATTR_FORK);
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if ((error != 0) && (error != EFSCORRUPTED))
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return(error);
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if (bp) {
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struct xfs_attr_leaf_entry *entries;
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node = bp->b_addr;
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switch (be16_to_cpu(node->hdr.info.magic)) {
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case XFS_DA_NODE_MAGIC:
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case XFS_DA3_NODE_MAGIC:
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trace_xfs_attr_list_wrong_blk(context);
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xfs_trans_brelse(NULL, bp);
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bp = NULL;
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break;
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case XFS_ATTR_LEAF_MAGIC:
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case XFS_ATTR3_LEAF_MAGIC:
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leaf = bp->b_addr;
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xfs_attr3_leaf_hdr_from_disk(&leafhdr, leaf);
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entries = xfs_attr3_leaf_entryp(leaf);
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if (cursor->hashval > be32_to_cpu(
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entries[leafhdr.count - 1].hashval)) {
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trace_xfs_attr_list_wrong_blk(context);
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xfs_trans_brelse(NULL, bp);
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bp = NULL;
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} else if (cursor->hashval <= be32_to_cpu(
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entries[0].hashval)) {
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trace_xfs_attr_list_wrong_blk(context);
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xfs_trans_brelse(NULL, bp);
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bp = NULL;
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}
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break;
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default:
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trace_xfs_attr_list_wrong_blk(context);
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xfs_trans_brelse(NULL, bp);
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bp = NULL;
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}
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}
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}
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/*
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* We did not find what we expected given the cursor's contents,
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* so we start from the top and work down based on the hash value.
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* Note that start of node block is same as start of leaf block.
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*/
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if (bp == NULL) {
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cursor->blkno = 0;
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for (;;) {
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__uint16_t magic;
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error = xfs_da3_node_read(NULL, dp,
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cursor->blkno, -1, &bp,
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XFS_ATTR_FORK);
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if (error)
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return(error);
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node = bp->b_addr;
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magic = be16_to_cpu(node->hdr.info.magic);
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if (magic == XFS_ATTR_LEAF_MAGIC ||
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magic == XFS_ATTR3_LEAF_MAGIC)
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break;
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if (magic != XFS_DA_NODE_MAGIC &&
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magic != XFS_DA3_NODE_MAGIC) {
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XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
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XFS_ERRLEVEL_LOW,
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context->dp->i_mount,
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node);
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xfs_trans_brelse(NULL, bp);
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return XFS_ERROR(EFSCORRUPTED);
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}
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dp->d_ops->node_hdr_from_disk(&nodehdr, node);
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btree = dp->d_ops->node_tree_p(node);
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for (i = 0; i < nodehdr.count; btree++, i++) {
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if (cursor->hashval
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<= be32_to_cpu(btree->hashval)) {
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cursor->blkno = be32_to_cpu(btree->before);
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trace_xfs_attr_list_node_descend(context,
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btree);
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break;
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}
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}
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if (i == nodehdr.count) {
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xfs_trans_brelse(NULL, bp);
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return 0;
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}
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xfs_trans_brelse(NULL, bp);
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}
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}
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ASSERT(bp != NULL);
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/*
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* Roll upward through the blocks, processing each leaf block in
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* order. As long as there is space in the result buffer, keep
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* adding the information.
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*/
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for (;;) {
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leaf = bp->b_addr;
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error = xfs_attr3_leaf_list_int(bp, context);
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if (error) {
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xfs_trans_brelse(NULL, bp);
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return error;
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}
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xfs_attr3_leaf_hdr_from_disk(&leafhdr, leaf);
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if (context->seen_enough || leafhdr.forw == 0)
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break;
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cursor->blkno = leafhdr.forw;
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xfs_trans_brelse(NULL, bp);
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error = xfs_attr3_leaf_read(NULL, dp, cursor->blkno, -1, &bp);
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if (error)
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return error;
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}
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xfs_trans_brelse(NULL, bp);
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return 0;
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}
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/*
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* Copy out attribute list entries for attr_list(), for leaf attribute lists.
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*/
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int
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xfs_attr3_leaf_list_int(
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struct xfs_buf *bp,
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struct xfs_attr_list_context *context)
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{
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struct attrlist_cursor_kern *cursor;
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struct xfs_attr_leafblock *leaf;
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struct xfs_attr3_icleaf_hdr ichdr;
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struct xfs_attr_leaf_entry *entries;
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struct xfs_attr_leaf_entry *entry;
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int retval;
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int i;
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trace_xfs_attr_list_leaf(context);
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leaf = bp->b_addr;
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xfs_attr3_leaf_hdr_from_disk(&ichdr, leaf);
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entries = xfs_attr3_leaf_entryp(leaf);
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cursor = context->cursor;
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cursor->initted = 1;
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/*
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* Re-find our place in the leaf block if this is a new syscall.
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*/
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if (context->resynch) {
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entry = &entries[0];
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for (i = 0; i < ichdr.count; entry++, i++) {
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if (be32_to_cpu(entry->hashval) == cursor->hashval) {
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if (cursor->offset == context->dupcnt) {
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context->dupcnt = 0;
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break;
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}
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context->dupcnt++;
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} else if (be32_to_cpu(entry->hashval) >
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cursor->hashval) {
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context->dupcnt = 0;
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break;
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}
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}
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if (i == ichdr.count) {
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trace_xfs_attr_list_notfound(context);
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return 0;
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}
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} else {
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entry = &entries[0];
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i = 0;
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}
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context->resynch = 0;
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/*
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* We have found our place, start copying out the new attributes.
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*/
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retval = 0;
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for (; i < ichdr.count; entry++, i++) {
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if (be32_to_cpu(entry->hashval) != cursor->hashval) {
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cursor->hashval = be32_to_cpu(entry->hashval);
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cursor->offset = 0;
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}
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if (entry->flags & XFS_ATTR_INCOMPLETE)
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continue; /* skip incomplete entries */
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if (entry->flags & XFS_ATTR_LOCAL) {
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xfs_attr_leaf_name_local_t *name_loc =
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xfs_attr3_leaf_name_local(leaf, i);
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retval = context->put_listent(context,
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entry->flags,
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name_loc->nameval,
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(int)name_loc->namelen,
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be16_to_cpu(name_loc->valuelen),
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&name_loc->nameval[name_loc->namelen]);
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if (retval)
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return retval;
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} else {
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xfs_attr_leaf_name_remote_t *name_rmt =
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xfs_attr3_leaf_name_remote(leaf, i);
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int valuelen = be32_to_cpu(name_rmt->valuelen);
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if (context->put_value) {
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xfs_da_args_t args;
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memset((char *)&args, 0, sizeof(args));
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args.dp = context->dp;
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args.whichfork = XFS_ATTR_FORK;
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args.valuelen = valuelen;
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args.value = kmem_alloc(valuelen, KM_SLEEP | KM_NOFS);
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args.rmtblkno = be32_to_cpu(name_rmt->valueblk);
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args.rmtblkcnt = xfs_attr3_rmt_blocks(
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args.dp->i_mount, valuelen);
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retval = xfs_attr_rmtval_get(&args);
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if (retval)
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return retval;
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retval = context->put_listent(context,
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entry->flags,
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name_rmt->name,
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(int)name_rmt->namelen,
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valuelen,
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args.value);
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kmem_free(args.value);
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} else {
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retval = context->put_listent(context,
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entry->flags,
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name_rmt->name,
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(int)name_rmt->namelen,
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valuelen,
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NULL);
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}
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if (retval)
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return retval;
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}
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if (context->seen_enough)
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break;
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cursor->offset++;
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}
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trace_xfs_attr_list_leaf_end(context);
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return retval;
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}
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/*
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* Copy out attribute entries for attr_list(), for leaf attribute lists.
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*/
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STATIC int
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xfs_attr_leaf_list(xfs_attr_list_context_t *context)
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{
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int error;
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struct xfs_buf *bp;
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trace_xfs_attr_leaf_list(context);
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context->cursor->blkno = 0;
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error = xfs_attr3_leaf_read(NULL, context->dp, 0, -1, &bp);
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if (error)
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return XFS_ERROR(error);
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error = xfs_attr3_leaf_list_int(bp, context);
|
|
xfs_trans_brelse(NULL, bp);
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
int
|
|
xfs_attr_list_int(
|
|
xfs_attr_list_context_t *context)
|
|
{
|
|
int error;
|
|
xfs_inode_t *dp = context->dp;
|
|
uint lock_mode;
|
|
|
|
XFS_STATS_INC(xs_attr_list);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
|
|
return EIO;
|
|
|
|
/*
|
|
* Decide on what work routines to call based on the inode size.
|
|
*/
|
|
lock_mode = xfs_ilock_attr_map_shared(dp);
|
|
if (!xfs_inode_hasattr(dp)) {
|
|
error = 0;
|
|
} else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
|
|
error = xfs_attr_shortform_list(context);
|
|
} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
|
|
error = xfs_attr_leaf_list(context);
|
|
} else {
|
|
error = xfs_attr_node_list(context);
|
|
}
|
|
xfs_iunlock(dp, lock_mode);
|
|
return error;
|
|
}
|
|
|
|
#define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
|
|
(((struct attrlist_ent *) 0)->a_name - (char *) 0)
|
|
#define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
|
|
((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
|
|
& ~(sizeof(u_int32_t)-1))
|
|
|
|
/*
|
|
* Format an attribute and copy it out to the user's buffer.
|
|
* Take care to check values and protect against them changing later,
|
|
* we may be reading them directly out of a user buffer.
|
|
*/
|
|
STATIC int
|
|
xfs_attr_put_listent(
|
|
xfs_attr_list_context_t *context,
|
|
int flags,
|
|
unsigned char *name,
|
|
int namelen,
|
|
int valuelen,
|
|
unsigned char *value)
|
|
{
|
|
struct attrlist *alist = (struct attrlist *)context->alist;
|
|
attrlist_ent_t *aep;
|
|
int arraytop;
|
|
|
|
ASSERT(!(context->flags & ATTR_KERNOVAL));
|
|
ASSERT(context->count >= 0);
|
|
ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
|
|
ASSERT(context->firstu >= sizeof(*alist));
|
|
ASSERT(context->firstu <= context->bufsize);
|
|
|
|
/*
|
|
* Only list entries in the right namespace.
|
|
*/
|
|
if (((context->flags & ATTR_SECURE) == 0) !=
|
|
((flags & XFS_ATTR_SECURE) == 0))
|
|
return 0;
|
|
if (((context->flags & ATTR_ROOT) == 0) !=
|
|
((flags & XFS_ATTR_ROOT) == 0))
|
|
return 0;
|
|
|
|
arraytop = sizeof(*alist) +
|
|
context->count * sizeof(alist->al_offset[0]);
|
|
context->firstu -= ATTR_ENTSIZE(namelen);
|
|
if (context->firstu < arraytop) {
|
|
trace_xfs_attr_list_full(context);
|
|
alist->al_more = 1;
|
|
context->seen_enough = 1;
|
|
return 1;
|
|
}
|
|
|
|
aep = (attrlist_ent_t *)&context->alist[context->firstu];
|
|
aep->a_valuelen = valuelen;
|
|
memcpy(aep->a_name, name, namelen);
|
|
aep->a_name[namelen] = 0;
|
|
alist->al_offset[context->count++] = context->firstu;
|
|
alist->al_count = context->count;
|
|
trace_xfs_attr_list_add(context);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Generate a list of extended attribute names and optionally
|
|
* also value lengths. Positive return value follows the XFS
|
|
* convention of being an error, zero or negative return code
|
|
* is the length of the buffer returned (negated), indicating
|
|
* success.
|
|
*/
|
|
int
|
|
xfs_attr_list(
|
|
xfs_inode_t *dp,
|
|
char *buffer,
|
|
int bufsize,
|
|
int flags,
|
|
attrlist_cursor_kern_t *cursor)
|
|
{
|
|
xfs_attr_list_context_t context;
|
|
struct attrlist *alist;
|
|
int error;
|
|
|
|
/*
|
|
* Validate the cursor.
|
|
*/
|
|
if (cursor->pad1 || cursor->pad2)
|
|
return(XFS_ERROR(EINVAL));
|
|
if ((cursor->initted == 0) &&
|
|
(cursor->hashval || cursor->blkno || cursor->offset))
|
|
return XFS_ERROR(EINVAL);
|
|
|
|
/*
|
|
* Check for a properly aligned buffer.
|
|
*/
|
|
if (((long)buffer) & (sizeof(int)-1))
|
|
return XFS_ERROR(EFAULT);
|
|
if (flags & ATTR_KERNOVAL)
|
|
bufsize = 0;
|
|
|
|
/*
|
|
* Initialize the output buffer.
|
|
*/
|
|
memset(&context, 0, sizeof(context));
|
|
context.dp = dp;
|
|
context.cursor = cursor;
|
|
context.resynch = 1;
|
|
context.flags = flags;
|
|
context.alist = buffer;
|
|
context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
|
|
context.firstu = context.bufsize;
|
|
context.put_listent = xfs_attr_put_listent;
|
|
|
|
alist = (struct attrlist *)context.alist;
|
|
alist->al_count = 0;
|
|
alist->al_more = 0;
|
|
alist->al_offset[0] = context.bufsize;
|
|
|
|
error = xfs_attr_list_int(&context);
|
|
ASSERT(error >= 0);
|
|
return error;
|
|
}
|