2013-08-12 10:49:38 +00:00
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/*
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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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2013-10-22 23:51:50 +00:00
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#include "xfs_format.h"
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2013-10-22 23:50:10 +00:00
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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2013-08-12 10:49:38 +00:00
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#include "xfs_bit.h"
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#include "xfs_mount.h"
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2013-10-14 22:17:51 +00:00
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#include "xfs_da_format.h"
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2013-08-12 10:49:38 +00:00
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#include "xfs_da_btree.h"
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#include "xfs_inode.h"
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2013-10-22 23:50:10 +00:00
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#include "xfs_trans.h"
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2013-08-12 10:49:38 +00:00
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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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2013-10-22 23:51:50 +00:00
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#include "xfs_attr_sf.h"
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#include "xfs_attr_remote.h"
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2013-08-12 10:49:38 +00:00
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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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2013-10-29 11:11:51 +00:00
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#include "xfs_dir2.h"
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2013-08-12 10:49:38 +00:00
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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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2014-06-22 05:03:54 +00:00
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return -1;
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2013-08-12 10:49:38 +00:00
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} else if (sa->hash > sb->hash) {
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2014-06-22 05:03:54 +00:00
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return 1;
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2013-08-12 10:49:38 +00:00
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} else {
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2014-06-22 05:03:54 +00:00
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return sa->entno - sb->entno;
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2013-08-12 10:49:38 +00:00
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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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2014-06-22 05:03:54 +00:00
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return 0;
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2013-08-12 10:49:38 +00:00
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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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2014-06-22 05:03:54 +00:00
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return 0;
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2013-08-12 10:49:38 +00:00
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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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2014-06-25 04:58:08 +00:00
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return -EFSCORRUPTED;
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2013-08-12 10:49:38 +00:00
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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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2014-06-22 05:03:54 +00:00
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return 0;
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2013-08-12 10:49:38 +00:00
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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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2014-06-22 05:03:54 +00:00
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return 0;
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2013-08-12 10:49:38 +00:00
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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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2013-10-29 11:11:51 +00:00
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struct xfs_inode *dp = context->dp;
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2015-04-13 01:26:02 +00:00
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struct xfs_mount *mp = dp->i_mount;
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2013-08-12 10:49:38 +00:00
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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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2013-10-29 11:11:51 +00:00
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error = xfs_da3_node_read(NULL, dp, cursor->blkno, -1,
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2013-08-12 10:49:38 +00:00
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&bp, XFS_ATTR_FORK);
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2014-06-25 04:58:08 +00:00
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if ((error != 0) && (error != -EFSCORRUPTED))
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2014-06-22 05:03:54 +00:00
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return error;
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2013-08-12 10:49:38 +00:00
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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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2015-04-13 01:26:02 +00:00
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xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo,
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&leafhdr, leaf);
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2013-08-12 10:49:38 +00:00
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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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|
2013-10-29 11:11:51 +00:00
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error = xfs_da3_node_read(NULL, dp,
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2013-08-12 10:49:38 +00:00
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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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2014-06-22 05:03:54 +00:00
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return error;
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2013-08-12 10:49:38 +00:00
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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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2014-06-25 04:58:08 +00:00
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return -EFSCORRUPTED;
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2013-08-12 10:49:38 +00:00
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}
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2013-10-29 11:11:52 +00:00
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dp->d_ops->node_hdr_from_disk(&nodehdr, node);
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2013-10-29 11:11:51 +00:00
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btree = dp->d_ops->node_tree_p(node);
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2013-08-12 10:49:38 +00:00
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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
|
|
|
|
* order. As long as there is space in the result buffer, keep
|
|
|
|
* adding the information.
|
|
|
|
*/
|
|
|
|
for (;;) {
|
|
|
|
leaf = bp->b_addr;
|
|
|
|
error = xfs_attr3_leaf_list_int(bp, context);
|
|
|
|
if (error) {
|
|
|
|
xfs_trans_brelse(NULL, bp);
|
|
|
|
return error;
|
|
|
|
}
|
2015-04-13 01:26:02 +00:00
|
|
|
xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
|
2013-08-12 10:49:38 +00:00
|
|
|
if (context->seen_enough || leafhdr.forw == 0)
|
|
|
|
break;
|
|
|
|
cursor->blkno = leafhdr.forw;
|
|
|
|
xfs_trans_brelse(NULL, bp);
|
2013-10-29 11:11:51 +00:00
|
|
|
error = xfs_attr3_leaf_read(NULL, dp, cursor->blkno, -1, &bp);
|
2013-08-12 10:49:38 +00:00
|
|
|
if (error)
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
xfs_trans_brelse(NULL, bp);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Copy out attribute list entries for attr_list(), for leaf attribute lists.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
xfs_attr3_leaf_list_int(
|
|
|
|
struct xfs_buf *bp,
|
|
|
|
struct xfs_attr_list_context *context)
|
|
|
|
{
|
|
|
|
struct attrlist_cursor_kern *cursor;
|
|
|
|
struct xfs_attr_leafblock *leaf;
|
|
|
|
struct xfs_attr3_icleaf_hdr ichdr;
|
|
|
|
struct xfs_attr_leaf_entry *entries;
|
|
|
|
struct xfs_attr_leaf_entry *entry;
|
|
|
|
int retval;
|
|
|
|
int i;
|
2015-04-13 01:26:02 +00:00
|
|
|
struct xfs_mount *mp = context->dp->i_mount;
|
2013-08-12 10:49:38 +00:00
|
|
|
|
|
|
|
trace_xfs_attr_list_leaf(context);
|
|
|
|
|
|
|
|
leaf = bp->b_addr;
|
2015-04-13 01:26:02 +00:00
|
|
|
xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
|
2013-08-12 10:49:38 +00:00
|
|
|
entries = xfs_attr3_leaf_entryp(leaf);
|
|
|
|
|
|
|
|
cursor = context->cursor;
|
|
|
|
cursor->initted = 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Re-find our place in the leaf block if this is a new syscall.
|
|
|
|
*/
|
|
|
|
if (context->resynch) {
|
|
|
|
entry = &entries[0];
|
|
|
|
for (i = 0; i < ichdr.count; entry++, i++) {
|
|
|
|
if (be32_to_cpu(entry->hashval) == cursor->hashval) {
|
|
|
|
if (cursor->offset == context->dupcnt) {
|
|
|
|
context->dupcnt = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
context->dupcnt++;
|
|
|
|
} else if (be32_to_cpu(entry->hashval) >
|
|
|
|
cursor->hashval) {
|
|
|
|
context->dupcnt = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (i == ichdr.count) {
|
|
|
|
trace_xfs_attr_list_notfound(context);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
entry = &entries[0];
|
|
|
|
i = 0;
|
|
|
|
}
|
|
|
|
context->resynch = 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We have found our place, start copying out the new attributes.
|
|
|
|
*/
|
|
|
|
retval = 0;
|
|
|
|
for (; i < ichdr.count; entry++, i++) {
|
|
|
|
if (be32_to_cpu(entry->hashval) != cursor->hashval) {
|
|
|
|
cursor->hashval = be32_to_cpu(entry->hashval);
|
|
|
|
cursor->offset = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (entry->flags & XFS_ATTR_INCOMPLETE)
|
|
|
|
continue; /* skip incomplete entries */
|
|
|
|
|
|
|
|
if (entry->flags & XFS_ATTR_LOCAL) {
|
|
|
|
xfs_attr_leaf_name_local_t *name_loc =
|
|
|
|
xfs_attr3_leaf_name_local(leaf, i);
|
|
|
|
|
|
|
|
retval = context->put_listent(context,
|
|
|
|
entry->flags,
|
|
|
|
name_loc->nameval,
|
|
|
|
(int)name_loc->namelen,
|
|
|
|
be16_to_cpu(name_loc->valuelen),
|
|
|
|
&name_loc->nameval[name_loc->namelen]);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
} else {
|
|
|
|
xfs_attr_leaf_name_remote_t *name_rmt =
|
|
|
|
xfs_attr3_leaf_name_remote(leaf, i);
|
|
|
|
|
|
|
|
int valuelen = be32_to_cpu(name_rmt->valuelen);
|
|
|
|
|
|
|
|
if (context->put_value) {
|
|
|
|
xfs_da_args_t args;
|
|
|
|
|
|
|
|
memset((char *)&args, 0, sizeof(args));
|
2014-06-06 05:01:58 +00:00
|
|
|
args.geo = context->dp->i_mount->m_attr_geo;
|
2013-08-12 10:49:38 +00:00
|
|
|
args.dp = context->dp;
|
|
|
|
args.whichfork = XFS_ATTR_FORK;
|
|
|
|
args.valuelen = valuelen;
|
xfs: remote attribute overwrite causes transaction overrun
Commit e461fcb ("xfs: remote attribute lookups require the value
length") passes the remote attribute length in the xfs_da_args
structure on lookup so that CRC calculations and validity checking
can be performed correctly by related code. This, unfortunately has
the side effect of changing the args->valuelen parameter in cases
where it shouldn't.
That is, when we replace a remote attribute, the incoming
replacement stores the value and length in args->value and
args->valuelen, but then the lookup which finds the existing remote
attribute overwrites args->valuelen with the length of the remote
attribute being replaced. Hence when we go to create the new
attribute, we create it of the size of the existing remote
attribute, not the size it is supposed to be. When the new attribute
is much smaller than the old attribute, this results in a
transaction overrun and an ASSERT() failure on a debug kernel:
XFS: Assertion failed: tp->t_blk_res_used <= tp->t_blk_res, file: fs/xfs/xfs_trans.c, line: 331
Fix this by keeping the remote attribute value length separate to
the attribute value length in the xfs_da_args structure. The enables
us to pass the length of the remote attribute to be removed without
overwriting the new attribute's length.
Also, ensure that when we save remote block contexts for a later
rename we zero the original state variables so that we don't confuse
the state of the attribute to be removes with the state of the new
attribute that we just added. [Spotted by Brain Foster.]
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2014-05-05 21:37:31 +00:00
|
|
|
args.rmtvaluelen = valuelen;
|
2013-08-12 10:49:38 +00:00
|
|
|
args.value = kmem_alloc(valuelen, KM_SLEEP | KM_NOFS);
|
|
|
|
args.rmtblkno = be32_to_cpu(name_rmt->valueblk);
|
|
|
|
args.rmtblkcnt = xfs_attr3_rmt_blocks(
|
|
|
|
args.dp->i_mount, valuelen);
|
|
|
|
retval = xfs_attr_rmtval_get(&args);
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
retval = context->put_listent(context,
|
|
|
|
entry->flags,
|
|
|
|
name_rmt->name,
|
|
|
|
(int)name_rmt->namelen,
|
|
|
|
valuelen,
|
|
|
|
args.value);
|
|
|
|
kmem_free(args.value);
|
|
|
|
} else {
|
|
|
|
retval = context->put_listent(context,
|
|
|
|
entry->flags,
|
|
|
|
name_rmt->name,
|
|
|
|
(int)name_rmt->namelen,
|
|
|
|
valuelen,
|
|
|
|
NULL);
|
|
|
|
}
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
if (context->seen_enough)
|
|
|
|
break;
|
|
|
|
cursor->offset++;
|
|
|
|
}
|
|
|
|
trace_xfs_attr_list_leaf_end(context);
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Copy out attribute entries for attr_list(), for leaf attribute lists.
|
|
|
|
*/
|
|
|
|
STATIC int
|
|
|
|
xfs_attr_leaf_list(xfs_attr_list_context_t *context)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
struct xfs_buf *bp;
|
|
|
|
|
|
|
|
trace_xfs_attr_leaf_list(context);
|
|
|
|
|
|
|
|
context->cursor->blkno = 0;
|
|
|
|
error = xfs_attr3_leaf_read(NULL, context->dp, 0, -1, &bp);
|
|
|
|
if (error)
|
2014-06-22 05:04:54 +00:00
|
|
|
return error;
|
2013-08-12 10:49:38 +00:00
|
|
|
|
|
|
|
error = xfs_attr3_leaf_list_int(bp, context);
|
|
|
|
xfs_trans_brelse(NULL, bp);
|
2014-06-22 05:04:54 +00:00
|
|
|
return error;
|
2013-08-12 10:49:38 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
xfs_attr_list_int(
|
|
|
|
xfs_attr_list_context_t *context)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
xfs_inode_t *dp = context->dp;
|
2013-12-06 20:30:16 +00:00
|
|
|
uint lock_mode;
|
2013-08-12 10:49:38 +00:00
|
|
|
|
2015-10-12 07:21:22 +00:00
|
|
|
XFS_STATS_INC(dp->i_mount, xs_attr_list);
|
2013-08-12 10:49:38 +00:00
|
|
|
|
|
|
|
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
|
2014-06-25 04:58:08 +00:00
|
|
|
return -EIO;
|
2013-08-12 10:49:38 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Decide on what work routines to call based on the inode size.
|
|
|
|
*/
|
2013-12-06 20:30:16 +00:00
|
|
|
lock_mode = xfs_ilock_attr_map_shared(dp);
|
2013-08-12 10:49:38 +00:00
|
|
|
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);
|
|
|
|
}
|
2013-12-06 20:30:16 +00:00
|
|
|
xfs_iunlock(dp, lock_mode);
|
2013-08-12 10:49:38 +00:00
|
|
|
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)
|
2014-06-25 04:58:08 +00:00
|
|
|
return -EINVAL;
|
2013-08-12 10:49:38 +00:00
|
|
|
if ((cursor->initted == 0) &&
|
|
|
|
(cursor->hashval || cursor->blkno || cursor->offset))
|
2014-06-25 04:58:08 +00:00
|
|
|
return -EINVAL;
|
2013-08-12 10:49:38 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Check for a properly aligned buffer.
|
|
|
|
*/
|
|
|
|
if (((long)buffer) & (sizeof(int)-1))
|
2014-06-25 04:58:08 +00:00
|
|
|
return -EFAULT;
|
2013-08-12 10:49:38 +00:00
|
|
|
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);
|
2014-06-25 04:58:08 +00:00
|
|
|
ASSERT(error <= 0);
|
2013-08-12 10:49:38 +00:00
|
|
|
return error;
|
|
|
|
}
|