[deliverable/linux.git] / fs / xfs / xfs_attr_list.c

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * Copyright (c) 2013 Red Hat, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_inode_item.h"
#include "xfs_bmap.h"
#include "xfs_attr.h"
#include "xfs_attr_sf.h"
#include "xfs_attr_remote.h"
#include "xfs_attr_leaf.h"
#include "xfs_error.h"
#include "xfs_trace.h"
#include "xfs_buf_item.h"
#include "xfs_cksum.h"
#include "xfs_dir2.h"

STATIC int
xfs_attr_shortform_compare(const void *a, const void *b)
{
	xfs_attr_sf_sort_t *sa, *sb;

	sa = (xfs_attr_sf_sort_t *)a;
	sb = (xfs_attr_sf_sort_t *)b;
	if (sa->hash < sb->hash) {
		return -1;
	} else if (sa->hash > sb->hash) {
		return 1;
	} else {
		return sa->entno - sb->entno;
	}
}

#define XFS_ISRESET_CURSOR(cursor) \
	(!((cursor)->initted) && !((cursor)->hashval) && \
	 !((cursor)->blkno) && !((cursor)->offset))
/*
 * Copy out entries of shortform attribute lists for attr_list().
 * Shortform attribute lists are not stored in hashval sorted order.
 * If the output buffer is not large enough to hold them all, then we
 * we have to calculate each entries' hashvalue and sort them before
 * we can begin returning them to the user.
 */
int
xfs_attr_shortform_list(xfs_attr_list_context_t *context)
{
	attrlist_cursor_kern_t *cursor;
	xfs_attr_sf_sort_t *sbuf, *sbp;
	xfs_attr_shortform_t *sf;
	xfs_attr_sf_entry_t *sfe;
	xfs_inode_t *dp;
	int sbsize, nsbuf, count, i;
	int error;

	ASSERT(context != NULL);
	dp = context->dp;
	ASSERT(dp != NULL);
	ASSERT(dp->i_afp != NULL);
	sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
	ASSERT(sf != NULL);
	if (!sf->hdr.count)
		return 0;
	cursor = context->cursor;
	ASSERT(cursor != NULL);

	trace_xfs_attr_list_sf(context);

	/*
	 * If the buffer is large enough and the cursor is at the start,
	 * do not bother with sorting since we will return everything in
	 * one buffer and another call using the cursor won't need to be
	 * made.
	 * Note the generous fudge factor of 16 overhead bytes per entry.
	 * If bufsize is zero then put_listent must be a search function
	 * and can just scan through what we have.
	 */
	if (context->bufsize == 0 ||
	    (XFS_ISRESET_CURSOR(cursor) &&
             (dp->i_afp->if_bytes + sf->hdr.count * 16) < context->bufsize)) {
		for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
			error = context->put_listent(context,
					   sfe->flags,
					   sfe->nameval,
					   (int)sfe->namelen,
					   (int)sfe->valuelen,
					   &sfe->nameval[sfe->namelen]);

			/*
			 * Either search callback finished early or
			 * didn't fit it all in the buffer after all.
			 */
			if (context->seen_enough)
				break;

			if (error)
				return error;
			sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
		}
		trace_xfs_attr_list_sf_all(context);
		return 0;
	}

	/* do no more for a search callback */
	if (context->bufsize == 0)
		return 0;

	/*
	 * It didn't all fit, so we have to sort everything on hashval.
	 */
	sbsize = sf->hdr.count * sizeof(*sbuf);
	sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP | KM_NOFS);

	/*
	 * Scan the attribute list for the rest of the entries, storing
	 * the relevant info from only those that match into a buffer.
	 */
	nsbuf = 0;
	for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
		if (unlikely(
		    ((char *)sfe < (char *)sf) ||
		    ((char *)sfe >= ((char *)sf + dp->i_afp->if_bytes)))) {
			XFS_CORRUPTION_ERROR("xfs_attr_shortform_list",
					     XFS_ERRLEVEL_LOW,
					     context->dp->i_mount, sfe);
			kmem_free(sbuf);
			return -EFSCORRUPTED;
		}

		sbp->entno = i;
		sbp->hash = xfs_da_hashname(sfe->nameval, sfe->namelen);
		sbp->name = sfe->nameval;
		sbp->namelen = sfe->namelen;
		/* These are bytes, and both on-disk, don't endian-flip */
		sbp->valuelen = sfe->valuelen;
		sbp->flags = sfe->flags;
		sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
		sbp++;
		nsbuf++;
	}

	/*
	 * Sort the entries on hash then entno.
	 */
	xfs_sort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare);

	/*
	 * Re-find our place IN THE SORTED LIST.
	 */
	count = 0;
	cursor->initted = 1;
	cursor->blkno = 0;
	for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) {
		if (sbp->hash == cursor->hashval) {
			if (cursor->offset == count) {
				break;
			}
			count++;
		} else if (sbp->hash > cursor->hashval) {
			break;
		}
	}
	if (i == nsbuf) {
		kmem_free(sbuf);
		return 0;
	}

	/*
	 * Loop putting entries into the user buffer.
	 */
	for ( ; i < nsbuf; i++, sbp++) {
		if (cursor->hashval != sbp->hash) {
			cursor->hashval = sbp->hash;
			cursor->offset = 0;
		}
		error = context->put_listent(context,
					sbp->flags,
					sbp->name,
					sbp->namelen,
					sbp->valuelen,
					&sbp->name[sbp->namelen]);
		if (error) {
			kmem_free(sbuf);
			return error;
		}
		if (context->seen_enough)
			break;
		cursor->offset++;
	}

	kmem_free(sbuf);
	return 0;
}

STATIC int
xfs_attr_node_list(xfs_attr_list_context_t *context)
{
	attrlist_cursor_kern_t *cursor;
	xfs_attr_leafblock_t *leaf;
	xfs_da_intnode_t *node;
	struct xfs_attr3_icleaf_hdr leafhdr;
	struct xfs_da3_icnode_hdr nodehdr;
	struct xfs_da_node_entry *btree;
	int error, i;
	struct xfs_buf *bp;
	struct xfs_inode	*dp = context->dp;
	struct xfs_mount	*mp = dp->i_mount;

	trace_xfs_attr_node_list(context);

	cursor = context->cursor;
	cursor->initted = 1;

	/*
	 * Do all sorts of validation on the passed-in cursor structure.
	 * If anything is amiss, ignore the cursor and look up the hashval
	 * starting from the btree root.
	 */
	bp = NULL;
	if (cursor->blkno > 0) {
		error = xfs_da3_node_read(NULL, dp, cursor->blkno, -1,
					      &bp, XFS_ATTR_FORK);
		if ((error != 0) && (error != -EFSCORRUPTED))
			return error;
		if (bp) {
			struct xfs_attr_leaf_entry *entries;

			node = bp->b_addr;
			switch (be16_to_cpu(node->hdr.info.magic)) {
			case XFS_DA_NODE_MAGIC:
			case XFS_DA3_NODE_MAGIC:
				trace_xfs_attr_list_wrong_blk(context);
				xfs_trans_brelse(NULL, bp);
				bp = NULL;
				break;
			case XFS_ATTR_LEAF_MAGIC:
			case XFS_ATTR3_LEAF_MAGIC:
				leaf = bp->b_addr;
				xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo,
							     &leafhdr, leaf);
				entries = xfs_attr3_leaf_entryp(leaf);
				if (cursor->hashval > be32_to_cpu(
						entries[leafhdr.count - 1].hashval)) {
					trace_xfs_attr_list_wrong_blk(context);
					xfs_trans_brelse(NULL, bp);
					bp = NULL;
				} else if (cursor->hashval <= be32_to_cpu(
						entries[0].hashval)) {
					trace_xfs_attr_list_wrong_blk(context);
					xfs_trans_brelse(NULL, bp);
					bp = NULL;
				}
				break;
			default:
				trace_xfs_attr_list_wrong_blk(context);
				xfs_trans_brelse(NULL, bp);
				bp = NULL;
			}
		}
	}

	/*
	 * We did not find what we expected given the cursor's contents,
	 * so we start from the top and work down based on the hash value.
	 * Note that start of node block is same as start of leaf block.
	 */
	if (bp == NULL) {
		cursor->blkno = 0;
		for (;;) {
			__uint16_t magic;

			error = xfs_da3_node_read(NULL, dp,
						      cursor->blkno, -1, &bp,
						      XFS_ATTR_FORK);
			if (error)
				return error;
			node = bp->b_addr;
			magic = be16_to_cpu(node->hdr.info.magic);
			if (magic == XFS_ATTR_LEAF_MAGIC ||
			    magic == XFS_ATTR3_LEAF_MAGIC)
				break;
			if (magic != XFS_DA_NODE_MAGIC &&
			    magic != XFS_DA3_NODE_MAGIC) {
				XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
						     XFS_ERRLEVEL_LOW,
						     context->dp->i_mount,
						     node);
				xfs_trans_brelse(NULL, bp);
				return -EFSCORRUPTED;
			}

			dp->d_ops->node_hdr_from_disk(&nodehdr, node);
			btree = dp->d_ops->node_tree_p(node);
			for (i = 0; i < nodehdr.count; btree++, i++) {
				if (cursor->hashval
						<= be32_to_cpu(btree->hashval)) {
					cursor->blkno = be32_to_cpu(btree->before);
					trace_xfs_attr_list_node_descend(context,
									 btree);
					break;
				}
			}
			if (i == nodehdr.count) {
				xfs_trans_brelse(NULL, bp);
				return 0;
			}
			xfs_trans_brelse(NULL, bp);
		}
	}
	ASSERT(bp != NULL);

	/*
	 * 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;
		}
		xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
		if (context->seen_enough || leafhdr.forw == 0)
			break;
		cursor->blkno = leafhdr.forw;
		xfs_trans_brelse(NULL, bp);
		error = xfs_attr3_leaf_read(NULL, dp, cursor->blkno, -1, &bp);
		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;
	struct xfs_mount		*mp = context->dp->i_mount;

	trace_xfs_attr_list_leaf(context);

	leaf = bp->b_addr;
	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
	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));
				args.geo = context->dp->i_mount->m_attr_geo;
				args.dp = context->dp;
				args.whichfork = XFS_ATTR_FORK;
				args.valuelen = valuelen;
				args.rmtvaluelen = valuelen;
				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)
					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)
		return error;

	error = xfs_attr3_leaf_list_int(bp, context);
	xfs_trans_brelse(NULL, bp);
	return 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(dp->i_mount, 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 -EINVAL;
	if ((cursor->initted == 0) &&
	    (cursor->hashval || cursor->blkno || cursor->offset))
		return -EINVAL;

	/*
	 * Check for a properly aligned buffer.
	 */
	if (((long)buffer) & (sizeof(int)-1))
		return -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;
}
Commit	Line	Data
abec5f2b DC	1	/*
	2	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
	3	* Copyright (c) 2013 Red Hat, Inc.
	4	* All Rights Reserved.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it would be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write the Free Software Foundation,
	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18	*/
	19	#include "xfs.h"
	20	#include "xfs_fs.h"
a4fbe6ab	21	#include "xfs_format.h"
239880ef DC	22	#include "xfs_log_format.h"
239880ef DC	23	#include "xfs_trans_resv.h"
abec5f2b	24	#include "xfs_bit.h"
abec5f2b	25	#include "xfs_mount.h"
57062787	26	#include "xfs_da_format.h"
abec5f2b	27	#include "xfs_da_btree.h"
abec5f2b	28	#include "xfs_inode.h"
239880ef	29	#include "xfs_trans.h"
abec5f2b DC	30	#include "xfs_inode_item.h"
	31	#include "xfs_bmap.h"
	32	#include "xfs_attr.h"
a4fbe6ab DC	33	#include "xfs_attr_sf.h"
a4fbe6ab DC	34	#include "xfs_attr_remote.h"
abec5f2b DC	35	#include "xfs_attr_leaf.h"
	36	#include "xfs_error.h"
	37	#include "xfs_trace.h"
	38	#include "xfs_buf_item.h"
	39	#include "xfs_cksum.h"
4bceb18f	40	#include "xfs_dir2.h"
abec5f2b DC	41
	42	STATIC int
	43	xfs_attr_shortform_compare(const void a, const void b)
	44	{
	45	xfs_attr_sf_sort_t sa, sb;
	46
	47	sa = (xfs_attr_sf_sort_t *)a;
	48	sb = (xfs_attr_sf_sort_t *)b;
	49	if (sa->hash < sb->hash) {
d99831ff	50	return -1;
abec5f2b	51	} else if (sa->hash > sb->hash) {
d99831ff	52	return 1;
abec5f2b	53	} else {
d99831ff	54	return sa->entno - sb->entno;
abec5f2b DC	55	}
	56	}
	57
	58	#define XFS_ISRESET_CURSOR(cursor) \
	59	(!((cursor)->initted) && !((cursor)->hashval) && \
	60	!((cursor)->blkno) && !((cursor)->offset))
	61	/*
	62	* Copy out entries of shortform attribute lists for attr_list().
	63	* Shortform attribute lists are not stored in hashval sorted order.
	64	* If the output buffer is not large enough to hold them all, then we
	65	* we have to calculate each entries' hashvalue and sort them before
	66	* we can begin returning them to the user.
	67	*/
	68	int
	69	xfs_attr_shortform_list(xfs_attr_list_context_t *context)
	70	{
	71	attrlist_cursor_kern_t *cursor;
	72	xfs_attr_sf_sort_t sbuf, sbp;
	73	xfs_attr_shortform_t *sf;
	74	xfs_attr_sf_entry_t *sfe;
	75	xfs_inode_t *dp;
	76	int sbsize, nsbuf, count, i;
	77	int error;
	78
	79	ASSERT(context != NULL);
	80	dp = context->dp;
	81	ASSERT(dp != NULL);
	82	ASSERT(dp->i_afp != NULL);
	83	sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
	84	ASSERT(sf != NULL);
	85	if (!sf->hdr.count)
d99831ff	86	return 0;
abec5f2b DC	87	cursor = context->cursor;
	88	ASSERT(cursor != NULL);
	89
	90	trace_xfs_attr_list_sf(context);
	91
	92	/*
	93	* If the buffer is large enough and the cursor is at the start,
	94	* do not bother with sorting since we will return everything in
	95	* one buffer and another call using the cursor won't need to be
	96	* made.
	97	* Note the generous fudge factor of 16 overhead bytes per entry.
	98	* If bufsize is zero then put_listent must be a search function
	99	* and can just scan through what we have.
	100	*/
	101	if (context->bufsize == 0 \|\|
	102	(XFS_ISRESET_CURSOR(cursor) &&
	103	(dp->i_afp->if_bytes + sf->hdr.count * 16) < context->bufsize)) {
	104	for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
	105	error = context->put_listent(context,
	106	sfe->flags,
	107	sfe->nameval,
	108	(int)sfe->namelen,
	109	(int)sfe->valuelen,
	110	&sfe->nameval[sfe->namelen]);
	111
	112	/*
	113	* Either search callback finished early or
	114	* didn't fit it all in the buffer after all.
	115	*/
	116	if (context->seen_enough)
	117	break;
	118
	119	if (error)
	120	return error;
	121	sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
	122	}
	123	trace_xfs_attr_list_sf_all(context);
d99831ff	124	return 0;
abec5f2b DC	125	}
	126
	127	/* do no more for a search callback */
	128	if (context->bufsize == 0)
	129	return 0;
	130
	131	/*
	132	* It didn't all fit, so we have to sort everything on hashval.
	133	*/
	134	sbsize = sf->hdr.count * sizeof(*sbuf);
	135	sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP \| KM_NOFS);
	136
	137	/*
	138	* Scan the attribute list for the rest of the entries, storing
	139	* the relevant info from only those that match into a buffer.
	140	*/
	141	nsbuf = 0;
	142	for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
	143	if (unlikely(
	144	((char )sfe < (char )sf) \|\|
	145	((char )sfe >= ((char )sf + dp->i_afp->if_bytes)))) {
	146	XFS_CORRUPTION_ERROR("xfs_attr_shortform_list",
	147	XFS_ERRLEVEL_LOW,
	148	context->dp->i_mount, sfe);
	149	kmem_free(sbuf);
2451337d	150	return -EFSCORRUPTED;
abec5f2b DC	151	}
	152
	153	sbp->entno = i;
	154	sbp->hash = xfs_da_hashname(sfe->nameval, sfe->namelen);
	155	sbp->name = sfe->nameval;
	156	sbp->namelen = sfe->namelen;
	157	/* These are bytes, and both on-disk, don't endian-flip */
	158	sbp->valuelen = sfe->valuelen;
	159	sbp->flags = sfe->flags;
	160	sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
	161	sbp++;
	162	nsbuf++;
	163	}
	164
	165	/*
	166	* Sort the entries on hash then entno.
	167	*/
	168	xfs_sort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare);
	169
	170	/*
	171	* Re-find our place IN THE SORTED LIST.
	172	*/
	173	count = 0;
	174	cursor->initted = 1;
	175	cursor->blkno = 0;
	176	for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) {
	177	if (sbp->hash == cursor->hashval) {
	178	if (cursor->offset == count) {
	179	break;
	180	}
	181	count++;
	182	} else if (sbp->hash > cursor->hashval) {
	183	break;
	184	}
	185	}
	186	if (i == nsbuf) {
	187	kmem_free(sbuf);
d99831ff	188	return 0;
abec5f2b DC	189	}
	190
	191	/*
	192	* Loop putting entries into the user buffer.
	193	*/
	194	for ( ; i < nsbuf; i++, sbp++) {
	195	if (cursor->hashval != sbp->hash) {
	196	cursor->hashval = sbp->hash;
	197	cursor->offset = 0;
	198	}
	199	error = context->put_listent(context,
	200	sbp->flags,
	201	sbp->name,
	202	sbp->namelen,
	203	sbp->valuelen,
	204	&sbp->name[sbp->namelen]);
2e83b79b MG	205	if (error) {
2e83b79b MG	206	kmem_free(sbuf);
abec5f2b	207	return error;
2e83b79b	208	}
abec5f2b DC	209	if (context->seen_enough)
	210	break;
	211	cursor->offset++;
	212	}
	213
	214	kmem_free(sbuf);
d99831ff	215	return 0;
abec5f2b DC	216	}
	217
	218	STATIC int
	219	xfs_attr_node_list(xfs_attr_list_context_t *context)
	220	{
	221	attrlist_cursor_kern_t *cursor;
	222	xfs_attr_leafblock_t *leaf;
	223	xfs_da_intnode_t *node;
	224	struct xfs_attr3_icleaf_hdr leafhdr;
	225	struct xfs_da3_icnode_hdr nodehdr;
	226	struct xfs_da_node_entry *btree;
	227	int error, i;
	228	struct xfs_buf *bp;
4bceb18f	229	struct xfs_inode *dp = context->dp;
2f661241	230	struct xfs_mount *mp = dp->i_mount;
abec5f2b DC	231
	232	trace_xfs_attr_node_list(context);
	233
	234	cursor = context->cursor;
	235	cursor->initted = 1;
	236
	237	/*
	238	* Do all sorts of validation on the passed-in cursor structure.
	239	* If anything is amiss, ignore the cursor and look up the hashval
	240	* starting from the btree root.
	241	*/
	242	bp = NULL;
	243	if (cursor->blkno > 0) {
4bceb18f	244	error = xfs_da3_node_read(NULL, dp, cursor->blkno, -1,
abec5f2b	245	&bp, XFS_ATTR_FORK);
2451337d	246	if ((error != 0) && (error != -EFSCORRUPTED))
d99831ff	247	return error;
abec5f2b DC	248	if (bp) {
	249	struct xfs_attr_leaf_entry *entries;
	250
	251	node = bp->b_addr;
	252	switch (be16_to_cpu(node->hdr.info.magic)) {
	253	case XFS_DA_NODE_MAGIC:
	254	case XFS_DA3_NODE_MAGIC:
	255	trace_xfs_attr_list_wrong_blk(context);
	256	xfs_trans_brelse(NULL, bp);
	257	bp = NULL;
	258	break;
	259	case XFS_ATTR_LEAF_MAGIC:
	260	case XFS_ATTR3_LEAF_MAGIC:
	261	leaf = bp->b_addr;
2f661241 BF	262	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo,
2f661241 BF	263	&leafhdr, leaf);
abec5f2b DC	264	entries = xfs_attr3_leaf_entryp(leaf);
	265	if (cursor->hashval > be32_to_cpu(
	266	entries[leafhdr.count - 1].hashval)) {
	267	trace_xfs_attr_list_wrong_blk(context);
	268	xfs_trans_brelse(NULL, bp);
	269	bp = NULL;
	270	} else if (cursor->hashval <= be32_to_cpu(
	271	entries[0].hashval)) {
	272	trace_xfs_attr_list_wrong_blk(context);
	273	xfs_trans_brelse(NULL, bp);
	274	bp = NULL;
	275	}
	276	break;
	277	default:
	278	trace_xfs_attr_list_wrong_blk(context);
	279	xfs_trans_brelse(NULL, bp);
	280	bp = NULL;
	281	}
	282	}
	283	}
	284
	285	/*
	286	* We did not find what we expected given the cursor's contents,
	287	* so we start from the top and work down based on the hash value.
	288	* Note that start of node block is same as start of leaf block.
	289	*/
	290	if (bp == NULL) {
	291	cursor->blkno = 0;
	292	for (;;) {
	293	__uint16_t magic;
	294
4bceb18f	295	error = xfs_da3_node_read(NULL, dp,
abec5f2b DC	296	cursor->blkno, -1, &bp,
	297	XFS_ATTR_FORK);
	298	if (error)
d99831ff	299	return error;
abec5f2b DC	300	node = bp->b_addr;
	301	magic = be16_to_cpu(node->hdr.info.magic);
	302	if (magic == XFS_ATTR_LEAF_MAGIC \|\|
	303	magic == XFS_ATTR3_LEAF_MAGIC)
	304	break;
	305	if (magic != XFS_DA_NODE_MAGIC &&
	306	magic != XFS_DA3_NODE_MAGIC) {
	307	XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
	308	XFS_ERRLEVEL_LOW,
	309	context->dp->i_mount,
	310	node);
	311	xfs_trans_brelse(NULL, bp);
2451337d	312	return -EFSCORRUPTED;
abec5f2b DC	313	}
abec5f2b DC	314
01ba43b8	315	dp->d_ops->node_hdr_from_disk(&nodehdr, node);
4bceb18f	316	btree = dp->d_ops->node_tree_p(node);
abec5f2b DC	317	for (i = 0; i < nodehdr.count; btree++, i++) {
	318	if (cursor->hashval
	319	<= be32_to_cpu(btree->hashval)) {
	320	cursor->blkno = be32_to_cpu(btree->before);
	321	trace_xfs_attr_list_node_descend(context,
	322	btree);
	323	break;
	324	}
	325	}
	326	if (i == nodehdr.count) {
	327	xfs_trans_brelse(NULL, bp);
	328	return 0;
	329	}
	330	xfs_trans_brelse(NULL, bp);
	331	}
	332	}
	333	ASSERT(bp != NULL);
	334
	335	/*
	336	* Roll upward through the blocks, processing each leaf block in
	337	* order. As long as there is space in the result buffer, keep
	338	* adding the information.
	339	*/
	340	for (;;) {
	341	leaf = bp->b_addr;
	342	error = xfs_attr3_leaf_list_int(bp, context);
	343	if (error) {
	344	xfs_trans_brelse(NULL, bp);
	345	return error;
	346	}
2f661241	347	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
abec5f2b DC	348	if (context->seen_enough \|\| leafhdr.forw == 0)
	349	break;
	350	cursor->blkno = leafhdr.forw;
	351	xfs_trans_brelse(NULL, bp);
4bceb18f	352	error = xfs_attr3_leaf_read(NULL, dp, cursor->blkno, -1, &bp);
abec5f2b DC	353	if (error)
	354	return error;
	355	}
	356	xfs_trans_brelse(NULL, bp);
	357	return 0;
	358	}
	359
	360	/*
	361	* Copy out attribute list entries for attr_list(), for leaf attribute lists.
	362	*/
	363	int
	364	xfs_attr3_leaf_list_int(
	365	struct xfs_buf *bp,
	366	struct xfs_attr_list_context *context)
	367	{
	368	struct attrlist_cursor_kern *cursor;
	369	struct xfs_attr_leafblock *leaf;
	370	struct xfs_attr3_icleaf_hdr ichdr;
	371	struct xfs_attr_leaf_entry *entries;
	372	struct xfs_attr_leaf_entry *entry;
	373	int retval;
	374	int i;
2f661241	375	struct xfs_mount *mp = context->dp->i_mount;
abec5f2b DC	376
	377	trace_xfs_attr_list_leaf(context);
	378
	379	leaf = bp->b_addr;
2f661241	380	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
abec5f2b DC	381	entries = xfs_attr3_leaf_entryp(leaf);
	382
	383	cursor = context->cursor;
	384	cursor->initted = 1;
	385
	386	/*
	387	* Re-find our place in the leaf block if this is a new syscall.
	388	*/
	389	if (context->resynch) {
	390	entry = &entries[0];
	391	for (i = 0; i < ichdr.count; entry++, i++) {
	392	if (be32_to_cpu(entry->hashval) == cursor->hashval) {
	393	if (cursor->offset == context->dupcnt) {
	394	context->dupcnt = 0;
	395	break;
	396	}
	397	context->dupcnt++;
	398	} else if (be32_to_cpu(entry->hashval) >
	399	cursor->hashval) {
	400	context->dupcnt = 0;
	401	break;
	402	}
	403	}
	404	if (i == ichdr.count) {
	405	trace_xfs_attr_list_notfound(context);
	406	return 0;
	407	}
	408	} else {
	409	entry = &entries[0];
	410	i = 0;
	411	}
	412	context->resynch = 0;
	413
	414	/*
	415	* We have found our place, start copying out the new attributes.
	416	*/
	417	retval = 0;
	418	for (; i < ichdr.count; entry++, i++) {
	419	if (be32_to_cpu(entry->hashval) != cursor->hashval) {
	420	cursor->hashval = be32_to_cpu(entry->hashval);
	421	cursor->offset = 0;
	422	}
	423
	424	if (entry->flags & XFS_ATTR_INCOMPLETE)
	425	continue; /* skip incomplete entries */
	426
	427	if (entry->flags & XFS_ATTR_LOCAL) {
	428	xfs_attr_leaf_name_local_t *name_loc =
	429	xfs_attr3_leaf_name_local(leaf, i);
	430
	431	retval = context->put_listent(context,
	432	entry->flags,
	433	name_loc->nameval,
	434	(int)name_loc->namelen,
	435	be16_to_cpu(name_loc->valuelen),
	436	&name_loc->nameval[name_loc->namelen]);
	437	if (retval)
	438	return retval;
	439	} else {
	440	xfs_attr_leaf_name_remote_t *name_rmt =
	441	xfs_attr3_leaf_name_remote(leaf, i);
	442
	443	int valuelen = be32_to_cpu(name_rmt->valuelen);
	444
445	if (context->put_value) {
446	xfs_da_args_t args;
447
448	memset((char *)&args, 0, sizeof(args));
0650b554	449	args.geo = context->dp->i_mount->m_attr_geo;
abec5f2b DC	450	args.dp = context->dp;
	451	args.whichfork = XFS_ATTR_FORK;
	452	args.valuelen = valuelen;
8275cdd0	453	args.rmtvaluelen = valuelen;
abec5f2b DC	454	args.value = kmem_alloc(valuelen, KM_SLEEP \| KM_NOFS);
	455	args.rmtblkno = be32_to_cpu(name_rmt->valueblk);
	456	args.rmtblkcnt = xfs_attr3_rmt_blocks(
	457	args.dp->i_mount, valuelen);
	458	retval = xfs_attr_rmtval_get(&args);
2e83b79b MG	459	if (!retval)
	460	retval = context->put_listent(context,
	461	entry->flags,
	462	name_rmt->name,
	463	(int)name_rmt->namelen,
	464	valuelen,
	465	args.value);
abec5f2b DC	466	kmem_free(args.value);
	467	} else {
	468	retval = context->put_listent(context,
	469	entry->flags,
	470	name_rmt->name,
	471	(int)name_rmt->namelen,
	472	valuelen,
	473	NULL);
	474	}
	475	if (retval)
	476	return retval;
	477	}
	478	if (context->seen_enough)
	479	break;
	480	cursor->offset++;
	481	}
	482	trace_xfs_attr_list_leaf_end(context);
	483	return retval;
	484	}
	485
	486	/*
	487	* Copy out attribute entries for attr_list(), for leaf attribute lists.
	488	*/
	489	STATIC int
	490	xfs_attr_leaf_list(xfs_attr_list_context_t *context)
	491	{
	492	int error;
	493	struct xfs_buf *bp;
	494
	495	trace_xfs_attr_leaf_list(context);
	496
	497	context->cursor->blkno = 0;
	498	error = xfs_attr3_leaf_read(NULL, context->dp, 0, -1, &bp);
	499	if (error)
b474c7ae	500	return error;
abec5f2b DC	501
	502	error = xfs_attr3_leaf_list_int(bp, context);
	503	xfs_trans_brelse(NULL, bp);
b474c7ae	504	return error;
abec5f2b DC	505	}
	506
	507	int
	508	xfs_attr_list_int(
	509	xfs_attr_list_context_t *context)
	510	{
	511	int error;
	512	xfs_inode_t *dp = context->dp;
568d994e	513	uint lock_mode;
abec5f2b	514
ff6d6af2	515	XFS_STATS_INC(dp->i_mount, xs_attr_list);
abec5f2b DC	516
abec5f2b DC	517	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
2451337d	518	return -EIO;
abec5f2b	519
abec5f2b DC	520	/*
	521	* Decide on what work routines to call based on the inode size.
	522	*/
568d994e	523	lock_mode = xfs_ilock_attr_map_shared(dp);
abec5f2b DC	524	if (!xfs_inode_hasattr(dp)) {
	525	error = 0;
	526	} else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
	527	error = xfs_attr_shortform_list(context);
	528	} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
	529	error = xfs_attr_leaf_list(context);
	530	} else {
	531	error = xfs_attr_node_list(context);
	532	}
568d994e	533	xfs_iunlock(dp, lock_mode);
abec5f2b DC	534	return error;
	535	}
	536
	537	#define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
	538	(((struct attrlist_ent ) 0)->a_name - (char ) 0)
	539	#define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
	540	((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
	541	& ~(sizeof(u_int32_t)-1))
	542
	543	/*
	544	* Format an attribute and copy it out to the user's buffer.
	545	* Take care to check values and protect against them changing later,
	546	* we may be reading them directly out of a user buffer.
	547	*/
	548	STATIC int
	549	xfs_attr_put_listent(
	550	xfs_attr_list_context_t *context,
	551	int flags,
	552	unsigned char *name,
	553	int namelen,
	554	int valuelen,
	555	unsigned char *value)
	556	{
	557	struct attrlist alist = (struct attrlist )context->alist;
	558	attrlist_ent_t *aep;
	559	int arraytop;
	560
	561	ASSERT(!(context->flags & ATTR_KERNOVAL));
	562	ASSERT(context->count >= 0);
	563	ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
	564	ASSERT(context->firstu >= sizeof(*alist));
	565	ASSERT(context->firstu <= context->bufsize);
	566
	567	/*
	568	* Only list entries in the right namespace.
	569	*/
	570	if (((context->flags & ATTR_SECURE) == 0) !=
	571	((flags & XFS_ATTR_SECURE) == 0))
	572	return 0;
	573	if (((context->flags & ATTR_ROOT) == 0) !=
	574	((flags & XFS_ATTR_ROOT) == 0))
	575	return 0;
	576
	577	arraytop = sizeof(*alist) +
	578	context->count * sizeof(alist->al_offset[0]);
	579	context->firstu -= ATTR_ENTSIZE(namelen);
	580	if (context->firstu < arraytop) {
	581	trace_xfs_attr_list_full(context);
	582	alist->al_more = 1;
	583	context->seen_enough = 1;
	584	return 1;
	585	}
	586
	587	aep = (attrlist_ent_t *)&context->alist[context->firstu];
	588	aep->a_valuelen = valuelen;
	589	memcpy(aep->a_name, name, namelen);
	590	aep->a_name[namelen] = 0;
	591	alist->al_offset[context->count++] = context->firstu;
	592	alist->al_count = context->count;
	593	trace_xfs_attr_list_add(context);
	594	return 0;
	595	}
	596
	597	/*
598	* Generate a list of extended attribute names and optionally
599	* also value lengths. Positive return value follows the XFS
600	* convention of being an error, zero or negative return code
601	* is the length of the buffer returned (negated), indicating
602	* success.
603	*/
604	int
605	xfs_attr_list(
606	xfs_inode_t *dp,
607	char *buffer,
608	int bufsize,
609	int flags,
610	attrlist_cursor_kern_t *cursor)
611	{
612	xfs_attr_list_context_t context;
613	struct attrlist *alist;
614	int error;
615
616	/*
617	* Validate the cursor.
618	*/
619	if (cursor->pad1 \|\| cursor->pad2)
2451337d	620	return -EINVAL;
abec5f2b DC	621	if ((cursor->initted == 0) &&
abec5f2b DC	622	(cursor->hashval \|\| cursor->blkno \|\| cursor->offset))
2451337d	623	return -EINVAL;
abec5f2b DC	624
	625	/*
	626	* Check for a properly aligned buffer.
	627	*/
	628	if (((long)buffer) & (sizeof(int)-1))
2451337d	629	return -EFAULT;
abec5f2b DC	630	if (flags & ATTR_KERNOVAL)
	631	bufsize = 0;
	632
	633	/*
	634	* Initialize the output buffer.
	635	*/
	636	memset(&context, 0, sizeof(context));
	637	context.dp = dp;
	638	context.cursor = cursor;
	639	context.resynch = 1;
	640	context.flags = flags;
	641	context.alist = buffer;
	642	context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
	643	context.firstu = context.bufsize;
	644	context.put_listent = xfs_attr_put_listent;
	645
	646	alist = (struct attrlist *)context.alist;
	647	alist->al_count = 0;
	648	alist->al_more = 0;
	649	alist->al_offset[0] = context.bufsize;
	650
	651	error = xfs_attr_list_int(&context);
2451337d	652	ASSERT(error <= 0);
abec5f2b DC	653	return error;
abec5f2b DC	654	}