Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2660 insertions, 0 deletions

diff --git a/fs/xfs/xfs_attr.c b/fs/xfs/xfs_attr.c
new file mode 100644
index 000000000000..ee8b5904ec7c
--- /dev/null
+++ b/fs/xfs/xfs_attr.c
@@ -0,0 +1,2660 @@
+/*
+ * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 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.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_alloc.h"
+#include "xfs_btree.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_da_btree.h"
+#include "xfs_attr.h"
+#include "xfs_attr_leaf.h"
+#include "xfs_error.h"
+#include "xfs_bit.h"
+#include "xfs_quota.h"
+#include "xfs_rw.h"
+#include "xfs_trans_space.h"
+#include "xfs_acl.h"
+
+/*
+ * xfs_attr.c
+ *
+ * Provide the external interfaces to manage attribute lists.
+ */
+
+/*========================================================================
+ * Function prototypes for the kernel.
+ *========================================================================*/
+
+/*
+ * Internal routines when attribute list fits inside the inode.
+ */
+STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
+
+/*
+ * Internal routines when attribute list is one block.
+ */
+STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
+STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
+STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
+
+/*
+ * Internal routines when attribute list is more than one block.
+ */
+STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
+STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
+STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
+STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
+STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
+
+/*
+ * Routines to manipulate out-of-line attribute values.
+ */
+STATIC int xfs_attr_rmtval_get(xfs_da_args_t *args);
+STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
+STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
+
+#define ATTR_RMTVALUE_MAPSIZE	1	/* # of map entries at once */
+
+#if defined(XFS_ATTR_TRACE)
+ktrace_t *xfs_attr_trace_buf;
+#endif
+
+
+/*========================================================================
+ * Overall external interface routines.
+ *========================================================================*/
+
+int
+xfs_attr_fetch(xfs_inode_t *ip, char *name, int namelen,
+	       char *value, int *valuelenp, int flags, struct cred *cred)
+{
+	xfs_da_args_t   args;
+	int             error;
+
+	if ((XFS_IFORK_Q(ip) == 0) ||
+	    (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
+	     ip->i_d.di_anextents == 0))
+		return(ENOATTR);
+
+	if (!(flags & (ATTR_KERNACCESS|ATTR_SECURE))) {
+		if ((error = xfs_iaccess(ip, S_IRUSR, cred)))
+			return(XFS_ERROR(error));
+	}
+
+	/*
+	 * Fill in the arg structure for this request.
+	 */
+	memset((char *)&args, 0, sizeof(args));
+	args.name = name;
+	args.namelen = namelen;
+	args.value = value;
+	args.valuelen = *valuelenp;
+	args.flags = flags;
+	args.hashval = xfs_da_hashname(args.name, args.namelen);
+	args.dp = ip;
+	args.whichfork = XFS_ATTR_FORK;
+
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	if (XFS_IFORK_Q(ip) == 0 ||
+	    (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
+	     ip->i_d.di_anextents == 0)) {
+		error = XFS_ERROR(ENOATTR);
+	} else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
+		error = xfs_attr_shortform_getvalue(&args);
+	} else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
+		error = xfs_attr_leaf_get(&args);
+	} else {
+		error = xfs_attr_node_get(&args);
+	}
+
+	/*
+	 * Return the number of bytes in the value to the caller.
+	 */
+	*valuelenp = args.valuelen;
+
+	if (error == EEXIST)
+		error = 0;
+	return(error);
+}
+
+int
+xfs_attr_get(bhv_desc_t *bdp, char *name, char *value, int *valuelenp,
+	     int flags, struct cred *cred)
+{
+	xfs_inode_t	*ip = XFS_BHVTOI(bdp);
+	int		error, namelen;
+
+	XFS_STATS_INC(xs_attr_get);
+
+	if (!name)
+		return(EINVAL);
+	namelen = strlen(name);
+	if (namelen >= MAXNAMELEN)
+		return(EFAULT);		/* match IRIX behaviour */
+
+	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+		return(EIO);
+
+	xfs_ilock(ip, XFS_ILOCK_SHARED);
+	error = xfs_attr_fetch(ip, name, namelen, value, valuelenp, flags, cred);
+	xfs_iunlock(ip, XFS_ILOCK_SHARED);
+	return(error);
+}
+
+/*ARGSUSED*/
+int								/* error */
+xfs_attr_set(bhv_desc_t *bdp, char *name, char *value, int valuelen, int flags,
+		     struct cred *cred)
+{
+	xfs_da_args_t	args;
+	xfs_inode_t	*dp;
+	xfs_fsblock_t	firstblock;
+	xfs_bmap_free_t flist;
+	int		error, err2, committed;
+	int		local, size;
+	uint		nblks;
+	xfs_mount_t	*mp;
+	int             rsvd = (flags & ATTR_ROOT) != 0;
+	int             namelen;
+
+	namelen = strlen(name);
+	if (namelen >= MAXNAMELEN)
+		return EFAULT;		/* match IRIX behaviour */
+
+	XFS_STATS_INC(xs_attr_set);
+
+	dp = XFS_BHVTOI(bdp);
+	mp = dp->i_mount;
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return (EIO);
+
+	xfs_ilock(dp, XFS_ILOCK_SHARED);
+	if (!(flags & ATTR_SECURE) &&
+	     (error = xfs_iaccess(dp, S_IWUSR, cred))) {
+		xfs_iunlock(dp, XFS_ILOCK_SHARED);
+		return(XFS_ERROR(error));
+	}
+	xfs_iunlock(dp, XFS_ILOCK_SHARED);
+
+	/*
+	 * Attach the dquots to the inode.
+	 */
+	if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
+		return (error);
+
+	/*
+	 * If the inode doesn't have an attribute fork, add one.
+	 * (inode must not be locked when we call this routine)
+	 */
+	if (XFS_IFORK_Q(dp) == 0) {
+		error = xfs_bmap_add_attrfork(dp, rsvd);
+		if (error)
+			return(error);
+	}
+
+	/*
+	 * Fill in the arg structure for this request.
+	 */
+	memset((char *)&args, 0, sizeof(args));
+	args.name = name;
+	args.namelen = namelen;
+	args.value = value;
+	args.valuelen = valuelen;
+	args.flags = flags;
+	args.hashval = xfs_da_hashname(args.name, args.namelen);
+	args.dp = dp;
+	args.firstblock = &firstblock;
+	args.flist = &flist;
+	args.whichfork = XFS_ATTR_FORK;
+	args.oknoent = 1;
+
+	/* Determine space new attribute will use, and if it will be inline
+	 * or out of line.
+	 */
+	size = xfs_attr_leaf_newentsize(&args, mp->m_sb.sb_blocksize, &local);
+
+	nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
+	if (local) {
+		if (size > (mp->m_sb.sb_blocksize >> 1)) {
+			/* Double split possible */
+			nblks <<= 1;
+		}
+	} else {
+		uint	dblocks = XFS_B_TO_FSB(mp, valuelen);
+		/* Out of line attribute, cannot double split, but make
+		 * room for the attribute value itself.
+		 */
+		nblks += dblocks;
+		nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
+	}
+
+	/* Size is now blocks for attribute data */
+	args.total = nblks;
+
+	/*
+	 * Start our first transaction of the day.
+	 *
+	 * All future transactions during this code must be "chained" off
+	 * this one via the trans_dup() call.  All transactions will contain
+	 * the inode, and the inode will always be marked with trans_ihold().
+	 * Since the inode will be locked in all transactions, we must log
+	 * the inode in every transaction to let it float upward through
+	 * the log.
+	 */
+	args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
+
+	/*
+	 * Root fork attributes can use reserved data blocks for this
+	 * operation if necessary
+	 */
+
+	if (rsvd)
+		args.trans->t_flags |= XFS_TRANS_RESERVE;
+
+	if ((error = xfs_trans_reserve(args.trans, (uint) nblks,
+				      XFS_ATTRSET_LOG_RES(mp, nblks),
+				      0, XFS_TRANS_PERM_LOG_RES,
+				      XFS_ATTRSET_LOG_COUNT))) {
+		xfs_trans_cancel(args.trans, 0);
+		return(error);
+	}
+	xfs_ilock(dp, XFS_ILOCK_EXCL);
+
+	error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, nblks, 0,
+			 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
+				XFS_QMOPT_RES_REGBLKS);
+	if (error) {
+		xfs_iunlock(dp, XFS_ILOCK_EXCL);
+		xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
+		return (error);
+	}
+
+	xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
+	xfs_trans_ihold(args.trans, dp);
+
+	/*
+	 * If the attribute list is non-existant or a shortform list,
+	 * upgrade it to a single-leaf-block attribute list.
+	 */
+	if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
+	    ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
+	     (dp->i_d.di_anextents == 0))) {
+
+		/*
+		 * Build initial attribute list (if required).
+		 */
+		if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
+			(void)xfs_attr_shortform_create(&args);
+
+		/*
+		 * Try to add the attr to the attribute list in
+		 * the inode.
+		 */
+		error = xfs_attr_shortform_addname(&args);
+		if (error != ENOSPC) {
+			/*
+			 * Commit the shortform mods, and we're done.
+			 * NOTE: this is also the error path (EEXIST, etc).
+			 */
+			ASSERT(args.trans != NULL);
+
+			/*
+			 * If this is a synchronous mount, make sure that
+			 * the transaction goes to disk before returning
+			 * to the user.
+			 */
+			if (mp->m_flags & XFS_MOUNT_WSYNC) {
+				xfs_trans_set_sync(args.trans);
+			}
+			err2 = xfs_trans_commit(args.trans,
+						 XFS_TRANS_RELEASE_LOG_RES,
+						 NULL);
+			xfs_iunlock(dp, XFS_ILOCK_EXCL);
+
+			/*
+			 * Hit the inode change time.
+			 */
+			if (!error && (flags & ATTR_KERNOTIME) == 0) {
+				xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
+			}
+			return(error == 0 ? err2 : error);
+		}
+
+		/*
+		 * It won't fit in the shortform, transform to a leaf block.
+		 * GROT: another possible req'mt for a double-split btree op.
+		 */
+		XFS_BMAP_INIT(args.flist, args.firstblock);
+		error = xfs_attr_shortform_to_leaf(&args);
+		if (!error) {
+			error = xfs_bmap_finish(&args.trans, args.flist,
+						*args.firstblock, &committed);
+		}
+		if (error) {
+			ASSERT(committed);
+			args.trans = NULL;
+			xfs_bmap_cancel(&flist);
+			goto out;
+		}
+
+		/*
+		 * bmap_finish() may have committed the last trans and started
+		 * a new one.  We need the inode to be in all transactions.
+		 */
+		if (committed) {
+			xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
+			xfs_trans_ihold(args.trans, dp);
+		}
+
+		/*
+		 * Commit the leaf transformation.  We'll need another (linked)
+		 * transaction to add the new attribute to the leaf.
+		 */
+		if ((error = xfs_attr_rolltrans(&args.trans, dp)))
+			goto out;
+
+	}
+
+	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
+		error = xfs_attr_leaf_addname(&args);
+	} else {
+		error = xfs_attr_node_addname(&args);
+	}
+	if (error) {
+		goto out;
+	}
+
+	/*
+	 * If this is a synchronous mount, make sure that the
+	 * transaction goes to disk before returning to the user.
+	 */
+	if (mp->m_flags & XFS_MOUNT_WSYNC) {
+		xfs_trans_set_sync(args.trans);
+	}
+
+	/*
+	 * Commit the last in the sequence of transactions.
+	 */
+	xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
+	error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
+				 NULL);
+	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+
+	/*
+	 * Hit the inode change time.
+	 */
+	if (!error && (flags & ATTR_KERNOTIME) == 0) {
+		xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
+	}
+
+	return(error);
+
+out:
+	if (args.trans)
+		xfs_trans_cancel(args.trans,
+			XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
+	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+	return(error);
+}
+
+/*
+ * Generic handler routine to remove a name from an attribute list.
+ * Transitions attribute list from Btree to shortform as necessary.
+ */
+/*ARGSUSED*/
+int								/* error */
+xfs_attr_remove(bhv_desc_t *bdp, char *name, int flags, struct cred *cred)
+{
+	xfs_da_args_t       args;
+	xfs_inode_t         *dp;
+	xfs_fsblock_t       firstblock;
+	xfs_bmap_free_t     flist;
+	int                 error;
+	xfs_mount_t         *mp;
+	int                 namelen;
+
+	ASSERT(MAXNAMELEN-1<=0xff); /* length is stored in uint8 */
+	namelen = strlen(name);
+	if (namelen>=MAXNAMELEN)
+		return EFAULT; /* match irix behaviour */
+
+	XFS_STATS_INC(xs_attr_remove);
+
+	dp = XFS_BHVTOI(bdp);
+	mp = dp->i_mount;
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return (EIO);
+
+	xfs_ilock(dp, XFS_ILOCK_SHARED);
+	if (!(flags & ATTR_SECURE) &&
+	     (error = xfs_iaccess(dp, S_IWUSR, cred))) {
+		xfs_iunlock(dp, XFS_ILOCK_SHARED);
+		return(XFS_ERROR(error));
+	} else if (XFS_IFORK_Q(dp) == 0 ||
+		   (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
+		    dp->i_d.di_anextents == 0)) {
+		xfs_iunlock(dp, XFS_ILOCK_SHARED);
+		return(XFS_ERROR(ENOATTR));
+	}
+	xfs_iunlock(dp, XFS_ILOCK_SHARED);
+
+	/*
+	 * Fill in the arg structure for this request.
+	 */
+	memset((char *)&args, 0, sizeof(args));
+	args.name = name;
+	args.namelen = namelen;
+	args.flags = flags;
+	args.hashval = xfs_da_hashname(args.name, args.namelen);
+	args.dp = dp;
+	args.firstblock = &firstblock;
+	args.flist = &flist;
+	args.total = 0;
+	args.whichfork = XFS_ATTR_FORK;
+
+	/*
+	 * Attach the dquots to the inode.
+	 */
+	if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
+		return (error);
+
+	/*
+	 * Start our first transaction of the day.
+	 *
+	 * All future transactions during this code must be "chained" off
+	 * this one via the trans_dup() call.  All transactions will contain
+	 * the inode, and the inode will always be marked with trans_ihold().
+	 * Since the inode will be locked in all transactions, we must log
+	 * the inode in every transaction to let it float upward through
+	 * the log.
+	 */
+	args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
+
+	/*
+	 * Root fork attributes can use reserved data blocks for this
+	 * operation if necessary
+	 */
+
+	if (flags & ATTR_ROOT)
+		args.trans->t_flags |= XFS_TRANS_RESERVE;
+
+	if ((error = xfs_trans_reserve(args.trans,
+				      XFS_ATTRRM_SPACE_RES(mp),
+				      XFS_ATTRRM_LOG_RES(mp),
+				      0, XFS_TRANS_PERM_LOG_RES,
+				      XFS_ATTRRM_LOG_COUNT))) {
+		xfs_trans_cancel(args.trans, 0);
+		return(error);
+
+	}
+
+	xfs_ilock(dp, XFS_ILOCK_EXCL);
+	/*
+	 * No need to make quota reservations here. We expect to release some
+	 * blocks not allocate in the common case.
+	 */
+	xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
+	xfs_trans_ihold(args.trans, dp);
+
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	if (XFS_IFORK_Q(dp) == 0 ||
+	    (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
+	     dp->i_d.di_anextents == 0)) {
+		error = XFS_ERROR(ENOATTR);
+		goto out;
+	}
+	if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
+		ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
+		error = xfs_attr_shortform_remove(&args);
+		if (error) {
+			goto out;
+		}
+	} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
+		error = xfs_attr_leaf_removename(&args);
+	} else {
+		error = xfs_attr_node_removename(&args);
+	}
+	if (error) {
+		goto out;
+	}
+
+	/*
+	 * If this is a synchronous mount, make sure that the
+	 * transaction goes to disk before returning to the user.
+	 */
+	if (mp->m_flags & XFS_MOUNT_WSYNC) {
+		xfs_trans_set_sync(args.trans);
+	}
+
+	/*
+	 * Commit the last in the sequence of transactions.
+	 */
+	xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
+	error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
+				 NULL);
+	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+
+	/*
+	 * Hit the inode change time.
+	 */
+	if (!error && (flags & ATTR_KERNOTIME) == 0) {
+		xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
+	}
+
+	return(error);
+
+out:
+	if (args.trans)
+		xfs_trans_cancel(args.trans,
+			XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
+	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+	return(error);
+}
+
+/*
+ * 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(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
+		      attrlist_cursor_kern_t *cursor, struct cred *cred)
+{
+	xfs_attr_list_context_t context;
+	xfs_inode_t *dp;
+	int error;
+
+	XFS_STATS_INC(xs_attr_list);
+
+	/*
+	 * 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.
+	 */
+	context.dp = dp = XFS_BHVTOI(bdp);
+	context.cursor = cursor;
+	context.count = 0;
+	context.dupcnt = 0;
+	context.resynch = 1;
+	context.flags = flags;
+	if (!(flags & ATTR_KERNAMELS)) {
+		context.bufsize = (bufsize & ~(sizeof(int)-1));  /* align */
+		context.firstu = context.bufsize;
+		context.alist = (attrlist_t *)buffer;
+		context.alist->al_count = 0;
+		context.alist->al_more = 0;
+		context.alist->al_offset[0] = context.bufsize;
+	}
+	else {
+		context.bufsize = bufsize;
+		context.firstu = context.bufsize;
+		context.alist = (attrlist_t *)buffer;
+	}
+
+	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
+		return (EIO);
+
+	xfs_ilock(dp, XFS_ILOCK_SHARED);
+	if (!(flags & ATTR_SECURE) &&
+	     (error = xfs_iaccess(dp, S_IRUSR, cred))) {
+		xfs_iunlock(dp, XFS_ILOCK_SHARED);
+		return(XFS_ERROR(error));
+	}
+
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	xfs_attr_trace_l_c("syscall start", &context);
+	if (XFS_IFORK_Q(dp) == 0 ||
+	    (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
+	     dp->i_d.di_anextents == 0)) {
+		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, XFS_ILOCK_SHARED);
+	xfs_attr_trace_l_c("syscall end", &context);
+
+	if (!(context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS))) {
+		ASSERT(error >= 0);
+	}
+	else {	/* must return negated buffer size or the error */
+		if (context.count < 0)
+			error = XFS_ERROR(ERANGE);
+		else
+			error = -context.count;
+	}
+
+	return(error);
+}
+
+int								/* error */
+xfs_attr_inactive(xfs_inode_t *dp)
+{
+	xfs_trans_t *trans;
+	xfs_mount_t *mp;
+	int error;
+
+	mp = dp->i_mount;
+	ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
+
+	xfs_ilock(dp, XFS_ILOCK_SHARED);
+	if ((XFS_IFORK_Q(dp) == 0) ||
+	    (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
+	    (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
+	     dp->i_d.di_anextents == 0)) {
+		xfs_iunlock(dp, XFS_ILOCK_SHARED);
+		return(0);
+	}
+	xfs_iunlock(dp, XFS_ILOCK_SHARED);
+
+	/*
+	 * Start our first transaction of the day.
+	 *
+	 * All future transactions during this code must be "chained" off
+	 * this one via the trans_dup() call.  All transactions will contain
+	 * the inode, and the inode will always be marked with trans_ihold().
+	 * Since the inode will be locked in all transactions, we must log
+	 * the inode in every transaction to let it float upward through
+	 * the log.
+	 */
+	trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
+	if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
+				      XFS_TRANS_PERM_LOG_RES,
+				      XFS_ATTRINVAL_LOG_COUNT))) {
+		xfs_trans_cancel(trans, 0);
+		return(error);
+	}
+	xfs_ilock(dp, XFS_ILOCK_EXCL);
+
+	/*
+	 * No need to make quota reservations here. We expect to release some
+	 * blocks, not allocate, in the common case.
+	 */
+	xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
+	xfs_trans_ihold(trans, dp);
+
+	/*
+	 * Decide on what work routines to call based on the inode size.
+	 */
+	if ((XFS_IFORK_Q(dp) == 0) ||
+	    (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
+	    (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
+	     dp->i_d.di_anextents == 0)) {
+		error = 0;
+		goto out;
+	}
+	error = xfs_attr_root_inactive(&trans, dp);
+	if (error)
+		goto out;
+	/*
+	 * signal synchronous inactive transactions unless this
+	 * is a synchronous mount filesystem in which case we
+	 * know that we're here because we've been called out of
+	 * xfs_inactive which means that the last reference is gone
+	 * and the unlink transaction has already hit the disk so
+	 * async inactive transactions are safe.
+	 */
+	if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
+				(!(mp->m_flags & XFS_MOUNT_WSYNC)
+				 ? 1 : 0))))
+		goto out;
+
+	/*
+	 * Commit the last in the sequence of transactions.
+	 */
+	xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
+	error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES,
+				 NULL);
+	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+
+	return(error);
+
+out:
+	xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
+	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+	return(error);
+}
+
+
+
+/*========================================================================
+ * External routines when attribute list is inside the inode
+ *========================================================================*/
+
+/*
+ * Add a name to the shortform attribute list structure
+ * This is the external routine.
+ */
+STATIC int
+xfs_attr_shortform_addname(xfs_da_args_t *args)
+{
+	int newsize, retval;
+
+	retval = xfs_attr_shortform_lookup(args);
+	if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
+		return(retval);
+	} else if (retval == EEXIST) {
+		if (args->flags & ATTR_CREATE)
+			return(retval);
+		retval = xfs_attr_shortform_remove(args);
+		ASSERT(retval == 0);
+	}
+
+	newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
+	newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
+	if ((newsize <= XFS_IFORK_ASIZE(args->dp)) &&
+	    (args->namelen < XFS_ATTR_SF_ENTSIZE_MAX) &&
+	    (args->valuelen < XFS_ATTR_SF_ENTSIZE_MAX)) {
+		retval = xfs_attr_shortform_add(args);
+		ASSERT(retval == 0);
+	} else {
+		return(XFS_ERROR(ENOSPC));
+	}
+	return(0);
+}
+
+
+/*========================================================================
+ * External routines when attribute list is one block
+ *========================================================================*/
+
+/*
+ * Add a name to the leaf attribute list structure
+ *
+ * This leaf block cannot have a "remote" value, we only call this routine
+ * if bmap_one_block() says there is only one block (ie: no remote blks).
+ */
+int
+xfs_attr_leaf_addname(xfs_da_args_t *args)
+{
+	xfs_inode_t *dp;
+	xfs_dabuf_t *bp;
+	int retval, error, committed;
+
+	/*
+	 * Read the (only) block in the attribute list in.
+	 */
+	dp = args->dp;
+	args->blkno = 0;
+	error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
+					     XFS_ATTR_FORK);
+	if (error)
+		return(error);
+	ASSERT(bp != NULL);
+
+	/*
+	 * Look up the given attribute in the leaf block.  Figure out if
+	 * the given flags produce an error or call for an atomic rename.
+	 */
+	retval = xfs_attr_leaf_lookup_int(bp, args);
+	if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
+		xfs_da_brelse(args->trans, bp);
+		return(retval);
+	} else if (retval == EEXIST) {
+		if (args->flags & ATTR_CREATE) {	/* pure create op */
+			xfs_da_brelse(args->trans, bp);
+			return(retval);
+		}
+		args->rename = 1;			/* an atomic rename */
+		args->blkno2 = args->blkno;		/* set 2nd entry info*/
+		args->index2 = args->index;
+		args->rmtblkno2 = args->rmtblkno;
+		args->rmtblkcnt2 = args->rmtblkcnt;
+	}
+
+	/*
+	 * Add the attribute to the leaf block, transitioning to a Btree
+	 * if required.
+	 */
+	retval = xfs_attr_leaf_add(bp, args);
+	xfs_da_buf_done(bp);
+	if (retval == ENOSPC) {
+		/*
+		 * Promote the attribute list to the Btree format, then
+		 * Commit that transaction so that the node_addname() call
+		 * can manage its own transactions.
+		 */
+		XFS_BMAP_INIT(args->flist, args->firstblock);
+		error = xfs_attr_leaf_to_node(args);
+		if (!error) {
+			error = xfs_bmap_finish(&args->trans, args->flist,
+						*args->firstblock, &committed);
+		}
+		if (error) {
+			ASSERT(committed);
+			args->trans = NULL;
+			xfs_bmap_cancel(args->flist);
+			return(error);
+		}
+
+		/*
+		 * bmap_finish() may have committed the last trans and started
+		 * a new one.  We need the inode to be in all transactions.
+		 */
+		if (committed) {
+			xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
+			xfs_trans_ihold(args->trans, dp);
+		}
+
+		/*
+		 * Commit the current trans (including the inode) and start
+		 * a new one.
+		 */
+		if ((error = xfs_attr_rolltrans(&args->trans, dp)))
+			return (error);
+
+		/*
+		 * Fob the whole rest of the problem off on the Btree code.
+		 */
+		error = xfs_attr_node_addname(args);
+		return(error);
+	}
+
+	/*
+	 * Commit the transaction that added the attr name so that
+	 * later routines can manage their own transactions.
+	 */
+	if ((error = xfs_attr_rolltrans(&args->trans, dp)))
+		return (error);
+
+	/*
+	 * If there was an out-of-line value, allocate the blocks we
+	 * identified for its storage and copy the value.  This is done
+	 * after we create the attribute so that we don't overflow the
+	 * maximum size of a transaction and/or hit a deadlock.
+	 */
+	if (args->rmtblkno > 0) {
+		error = xfs_attr_rmtval_set(args);
+		if (error)
+			return(error);
+	}
+
+	/*
+	 * If this is an atomic rename operation, we must "flip" the
+	 * incomplete flags on the "new" and "old" attribute/value pairs
+	 * so that one disappears and one appears atomically.  Then we
+	 * must remove the "old" attribute/value pair.
+	 */
+	if (args->rename) {
+		/*
+		 * In a separate transaction, set the incomplete flag on the
+		 * "old" attr and clear the incomplete flag on the "new" attr.
+		 */
+		error = xfs_attr_leaf_flipflags(args);
+		if (error)
+			return(error);
+
+		/*
+		 * Dismantle the "old" attribute/value pair by removing
+		 * a "remote" value (if it exists).
+		 */
+		args->index = args->index2;
+		args->blkno = args->blkno2;
+		args->rmtblkno = args->rmtblkno2;
+		args->rmtblkcnt = args->rmtblkcnt2;
+		if (args->rmtblkno) {
+			error = xfs_attr_rmtval_remove(args);
+			if (error)
+				return(error);
+		}
+
+		/*
+		 * Read in the block containing the "old" attr, then
+		 * remove the "old" attr from that block (neat, huh!)
+		 */
+		error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
+						     &bp, XFS_ATTR_FORK);
+		if (error)
+			return(error);
+		ASSERT(bp != NULL);
+		(void)xfs_attr_leaf_remove(bp, args);
+
+		/*
+		 * If the result is small enough, shrink it all into the inode.
+		 */
+		if (xfs_attr_shortform_allfit(bp, dp)) {
+			XFS_BMAP_INIT(args->flist, args->firstblock);
+			error = xfs_attr_leaf_to_shortform(bp, args);
+			/* bp is gone due to xfs_da_shrink_inode */
+			if (!error) {
+				error = xfs_bmap_finish(&args->trans,
+							args->flist,
+							*args->firstblock,
+							&committed);
+			}
+			if (error) {
+				ASSERT(committed);
+				args->trans = NULL;
+				xfs_bmap_cancel(args->flist);
+				return(error);
+			}
+
+			/*
+			 * bmap_finish() may have committed the last trans
+			 * and started a new one.  We need the inode to be
+			 * in all transactions.
+			 */
+			if (committed) {
+				xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
+				xfs_trans_ihold(args->trans, dp);
+			}
+		} else
+			xfs_da_buf_done(bp);
+
+		/*
+		 * Commit the remove and start the next trans in series.
+		 */
+		error = xfs_attr_rolltrans(&args->trans, dp);
+
+	} else if (args->rmtblkno > 0) {
+		/*
+		 * Added a "remote" value, just clear the incomplete flag.
+		 */
+		error = xfs_attr_leaf_clearflag(args);
+	}
+	return(error);
+}
+
+/*
+ * Remove a name from the leaf attribute list structure
+ *
+ * This leaf block cannot have a "remote" value, we only call this routine
+ * if bmap_one_block() says there is only one block (ie: no remote blks).
+ */
+STATIC int
+xfs_attr_leaf_removename(xfs_da_args_t *args)
+{
+	xfs_inode_t *dp;
+	xfs_dabuf_t *bp;
+	int committed;
+	int error;
+
+	/*
+	 * Remove the attribute.
+	 */
+	dp = args->dp;
+	args->blkno = 0;
+	error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
+					     XFS_ATTR_FORK);
+	if (error) {
+		return(error);
+	}
+
+	ASSERT(bp != NULL);
+	error = xfs_attr_leaf_lookup_int(bp, args);
+	if (error == ENOATTR) {
+		xfs_da_brelse(args->trans, bp);
+		return(error);
+	}
+
+	(void)xfs_attr_leaf_remove(bp, args);
+
+	/*
+	 * If the result is small enough, shrink it all into the inode.
+	 */
+	if (xfs_attr_shortform_allfit(bp, dp)) {
+		XFS_BMAP_INIT(args->flist, args->firstblock);
+		error = xfs_attr_leaf_to_shortform(bp, args);
+		/* bp is gone due to xfs_da_shrink_inode */
+		if (!error) {
+			error = xfs_bmap_finish(&args->trans, args->flist,
+						*args->firstblock, &committed);
+		}
+		if (error) {
+			ASSERT(committed);
+			args->trans = NULL;
+			xfs_bmap_cancel(args->flist);
+			return(error);
+		}
+
+		/*
+		 * bmap_finish() may have committed the last trans and started
+		 * a new one.  We need the inode to be in all transactions.
+		 */
+		if (committed) {
+			xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
+			xfs_trans_ihold(args->trans, dp);
+		}
+	} else
+		xfs_da_buf_done(bp);
+	return(0);
+}
+
+/*
+ * Look up a name in a leaf attribute list structure.
+ *
+ * This leaf block cannot have a "remote" value, we only call this routine
+ * if bmap_one_block() says there is only one block (ie: no remote blks).
+ */
+int
+xfs_attr_leaf_get(xfs_da_args_t *args)
+{
+	xfs_dabuf_t *bp;
+	int error;
+
+	args->blkno = 0;
+	error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
+					     XFS_ATTR_FORK);
+	if (error)
+		return(error);
+	ASSERT(bp != NULL);
+
+	error = xfs_attr_leaf_lookup_int(bp, args);
+	if (error != EEXIST)  {
+		xfs_da_brelse(args->trans, bp);
+		return(error);
+	}
+	error = xfs_attr_leaf_getvalue(bp, args);
+	xfs_da_brelse(args->trans, bp);
+	if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
+		error = xfs_attr_rmtval_get(args);
+	}
+	return(error);
+}
+
+/*
+ * Copy out attribute entries for attr_list(), for leaf attribute lists.
+ */
+STATIC int
+xfs_attr_leaf_list(xfs_attr_list_context_t *context)
+{
+	xfs_attr_leafblock_t *leaf;
+	int error;
+	xfs_dabuf_t *bp;
+
+	context->cursor->blkno = 0;
+	error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
+	if (error)
+		return(error);
+	ASSERT(bp != NULL);
+	leaf = bp->data;
+	if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+						!= XFS_ATTR_LEAF_MAGIC)) {
+		XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
+				     context->dp->i_mount, leaf);
+		xfs_da_brelse(NULL, bp);
+		return(XFS_ERROR(EFSCORRUPTED));
+	}
+
+	(void)xfs_attr_leaf_list_int(bp, context);
+	xfs_da_brelse(NULL, bp);
+	return(0);
+}
+
+
+/*========================================================================
+ * External routines when attribute list size > XFS_LBSIZE(mp).
+ *========================================================================*/
+
+/*
+ * Add a name to a Btree-format attribute list.
+ *
+ * This will involve walking down the Btree, and may involve splitting
+ * leaf nodes and even splitting intermediate nodes up to and including
+ * the root node (a special case of an intermediate node).
+ *
+ * "Remote" attribute values confuse the issue and atomic rename operations
+ * add a whole extra layer of confusion on top of that.
+ */
+STATIC int
+xfs_attr_node_addname(xfs_da_args_t *args)
+{
+	xfs_da_state_t *state;
+	xfs_da_state_blk_t *blk;
+	xfs_inode_t *dp;
+	xfs_mount_t *mp;
+	int committed, retval, error;
+
+	/*
+	 * Fill in bucket of arguments/results/context to carry around.
+	 */
+	dp = args->dp;
+	mp = dp->i_mount;
+restart:
+	state = xfs_da_state_alloc();
+	state->args = args;
+	state->mp = mp;
+	state->blocksize = state->mp->m_sb.sb_blocksize;
+	state->node_ents = state->mp->m_attr_node_ents;
+
+	/*
+	 * Search to see if name already exists, and get back a pointer
+	 * to where it should go.
+	 */
+	error = xfs_da_node_lookup_int(state, &retval);
+	if (error)
+		goto out;
+	blk = &state->path.blk[ state->path.active-1 ];
+	ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
+	if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
+		goto out;
+	} else if (retval == EEXIST) {
+		if (args->flags & ATTR_CREATE)
+			goto out;
+		args->rename = 1;			/* atomic rename op */
+		args->blkno2 = args->blkno;		/* set 2nd entry info*/
+		args->index2 = args->index;
+		args->rmtblkno2 = args->rmtblkno;
+		args->rmtblkcnt2 = args->rmtblkcnt;
+		args->rmtblkno = 0;
+		args->rmtblkcnt = 0;
+	}
+
+	retval = xfs_attr_leaf_add(blk->bp, state->args);
+	if (retval == ENOSPC) {
+		if (state->path.active == 1) {
+			/*
+			 * Its really a single leaf node, but it had
+			 * out-of-line values so it looked like it *might*
+			 * have been a b-tree.
+			 */
+			xfs_da_state_free(state);
+			XFS_BMAP_INIT(args->flist, args->firstblock);
+			error = xfs_attr_leaf_to_node(args);
+			if (!error) {
+				error = xfs_bmap_finish(&args->trans,
+							args->flist,
+							*args->firstblock,
+							&committed);
+			}
+			if (error) {
+				ASSERT(committed);
+				args->trans = NULL;
+				xfs_bmap_cancel(args->flist);
+				goto out;
+			}
+
+			/*
+			 * bmap_finish() may have committed the last trans
+			 * and started a new one.  We need the inode to be
+			 * in all transactions.
+			 */
+			if (committed) {
+				xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
+				xfs_trans_ihold(args->trans, dp);
+			}
+
+			/*
+			 * Commit the node conversion and start the next
+			 * trans in the chain.
+			 */
+			if ((error = xfs_attr_rolltrans(&args->trans, dp)))
+				goto out;
+
+			goto restart;
+		}
+
+		/*
+		 * Split as many Btree elements as required.
+		 * This code tracks the new and old attr's location
+		 * in the index/blkno/rmtblkno/rmtblkcnt fields and
+		 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
+		 */
+		XFS_BMAP_INIT(args->flist, args->firstblock);
+		error = xfs_da_split(state);
+		if (!error) {
+			error = xfs_bmap_finish(&args->trans, args->flist,
+						*args->firstblock, &committed);
+		}
+		if (error) {
+			ASSERT(committed);
+			args->trans = NULL;
+			xfs_bmap_cancel(args->flist);
+			goto out;
+		}
+
+		/*
+		 * bmap_finish() may have committed the last trans and started
+		 * a new one.  We need the inode to be in all transactions.
+		 */
+		if (committed) {
+			xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
+			xfs_trans_ihold(args->trans, dp);
+		}
+	} else {
+		/*
+		 * Addition succeeded, update Btree hashvals.
+		 */
+		xfs_da_fixhashpath(state, &state->path);
+	}
+
+	/*
+	 * Kill the state structure, we're done with it and need to
+	 * allow the buffers to come back later.
+	 */
+	xfs_da_state_free(state);
+	state = NULL;
+
+	/*
+	 * Commit the leaf addition or btree split and start the next
+	 * trans in the chain.
+	 */
+	if ((error = xfs_attr_rolltrans(&args->trans, dp)))
+		goto out;
+
+	/*
+	 * If there was an out-of-line value, allocate the blocks we
+	 * identified for its storage and copy the value.  This is done
+	 * after we create the attribute so that we don't overflow the
+	 * maximum size of a transaction and/or hit a deadlock.
+	 */
+	if (args->rmtblkno > 0) {
+		error = xfs_attr_rmtval_set(args);
+		if (error)
+			return(error);
+	}
+
+	/*
+	 * If this is an atomic rename operation, we must "flip" the
+	 * incomplete flags on the "new" and "old" attribute/value pairs
+	 * so that one disappears and one appears atomically.  Then we
+	 * must remove the "old" attribute/value pair.
+	 */
+	if (args->rename) {
+		/*
+		 * In a separate transaction, set the incomplete flag on the
+		 * "old" attr and clear the incomplete flag on the "new" attr.
+		 */
+		error = xfs_attr_leaf_flipflags(args);
+		if (error)
+			goto out;
+
+		/*
+		 * Dismantle the "old" attribute/value pair by removing
+		 * a "remote" value (if it exists).
+		 */
+		args->index = args->index2;
+		args->blkno = args->blkno2;
+		args->rmtblkno = args->rmtblkno2;
+		args->rmtblkcnt = args->rmtblkcnt2;
+		if (args->rmtblkno) {
+			error = xfs_attr_rmtval_remove(args);
+			if (error)
+				return(error);
+		}
+
+		/*
+		 * Re-find the "old" attribute entry after any split ops.
+		 * The INCOMPLETE flag means that we will find the "old"
+		 * attr, not the "new" one.
+		 */
+		args->flags |= XFS_ATTR_INCOMPLETE;
+		state = xfs_da_state_alloc();
+		state->args = args;
+		state->mp = mp;
+		state->blocksize = state->mp->m_sb.sb_blocksize;
+		state->node_ents = state->mp->m_attr_node_ents;
+		state->inleaf = 0;
+		error = xfs_da_node_lookup_int(state, &retval);
+		if (error)
+			goto out;
+
+		/*
+		 * Remove the name and update the hashvals in the tree.
+		 */
+		blk = &state->path.blk[ state->path.active-1 ];
+		ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
+		error = xfs_attr_leaf_remove(blk->bp, args);
+		xfs_da_fixhashpath(state, &state->path);
+
+		/*
+		 * Check to see if the tree needs to be collapsed.
+		 */
+		if (retval && (state->path.active > 1)) {
+			XFS_BMAP_INIT(args->flist, args->firstblock);
+			error = xfs_da_join(state);
+			if (!error) {
+				error = xfs_bmap_finish(&args->trans,
+							args->flist,
+							*args->firstblock,
+							&committed);
+			}
+			if (error) {
+				ASSERT(committed);
+				args->trans = NULL;
+				xfs_bmap_cancel(args->flist);
+				goto out;
+			}
+
+			/*
+			 * bmap_finish() may have committed the last trans
+			 * and started a new one.  We need the inode to be
+			 * in all transactions.
+			 */
+			if (committed) {
+				xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
+				xfs_trans_ihold(args->trans, dp);
+			}
+		}
+
+		/*
+		 * Commit and start the next trans in the chain.
+		 */
+		if ((error = xfs_attr_rolltrans(&args->trans, dp)))
+			goto out;
+
+	} else if (args->rmtblkno > 0) {
+		/*
+		 * Added a "remote" value, just clear the incomplete flag.
+		 */
+		error = xfs_attr_leaf_clearflag(args);
+		if (error)
+			goto out;
+	}
+	retval = error = 0;
+
+out:
+	if (state)
+		xfs_da_state_free(state);
+	if (error)
+		return(error);
+	return(retval);
+}
+
+/*
+ * Remove a name from a B-tree attribute list.
+ *
+ * This will involve walking down the Btree, and may involve joining
+ * leaf nodes and even joining intermediate nodes up to and including
+ * the root node (a special case of an intermediate node).
+ */
+STATIC int
+xfs_attr_node_removename(xfs_da_args_t *args)
+{
+	xfs_da_state_t *state;
+	xfs_da_state_blk_t *blk;
+	xfs_inode_t *dp;
+	xfs_dabuf_t *bp;
+	int retval, error, committed;
+
+	/*
+	 * Tie a string around our finger to remind us where we are.
+	 */
+	dp = args->dp;
+	state = xfs_da_state_alloc();
+	state->args = args;
+	state->mp = dp->i_mount;
+	state->blocksize = state->mp->m_sb.sb_blocksize;
+	state->node_ents = state->mp->m_attr_node_ents;
+
+	/*
+	 * Search to see if name exists, and get back a pointer to it.
+	 */
+	error = xfs_da_node_lookup_int(state, &retval);
+	if (error || (retval != EEXIST)) {
+		if (error == 0)
+			error = retval;
+		goto out;
+	}
+
+	/*
+	 * If there is an out-of-line value, de-allocate the blocks.
+	 * This is done before we remove the attribute so that we don't
+	 * overflow the maximum size of a transaction and/or hit a deadlock.
+	 */
+	blk = &state->path.blk[ state->path.active-1 ];
+	ASSERT(blk->bp != NULL);
+	ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
+	if (args->rmtblkno > 0) {
+		/*
+		 * Fill in disk block numbers in the state structure
+		 * so that we can get the buffers back after we commit
+		 * several transactions in the following calls.
+		 */
+		error = xfs_attr_fillstate(state);
+		if (error)
+			goto out;
+
+		/*
+		 * Mark the attribute as INCOMPLETE, then bunmapi() the
+		 * remote value.
+		 */
+		error = xfs_attr_leaf_setflag(args);
+		if (error)
+			goto out;
+		error = xfs_attr_rmtval_remove(args);
+		if (error)
+			goto out;
+
+		/*
+		 * Refill the state structure with buffers, the prior calls
+		 * released our buffers.
+		 */
+		error = xfs_attr_refillstate(state);
+		if (error)
+			goto out;
+	}
+
+	/*
+	 * Remove the name and update the hashvals in the tree.
+	 */
+	blk = &state->path.blk[ state->path.active-1 ];
+	ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
+	retval = xfs_attr_leaf_remove(blk->bp, args);
+	xfs_da_fixhashpath(state, &state->path);
+
+	/*
+	 * Check to see if the tree needs to be collapsed.
+	 */
+	if (retval && (state->path.active > 1)) {
+		XFS_BMAP_INIT(args->flist, args->firstblock);
+		error = xfs_da_join(state);
+		if (!error) {
+			error = xfs_bmap_finish(&args->trans, args->flist,
+						*args->firstblock, &committed);
+		}
+		if (error) {
+			ASSERT(committed);
+			args->trans = NULL;
+			xfs_bmap_cancel(args->flist);
+			goto out;
+		}
+
+		/*
+		 * bmap_finish() may have committed the last trans and started
+		 * a new one.  We need the inode to be in all transactions.
+		 */
+		if (committed) {
+			xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
+			xfs_trans_ihold(args->trans, dp);
+		}
+
+		/*
+		 * Commit the Btree join operation and start a new trans.
+		 */
+		if ((error = xfs_attr_rolltrans(&args->trans, dp)))
+			goto out;
+	}
+
+	/*
+	 * If the result is small enough, push it all into the inode.
+	 */
+	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
+		/*
+		 * Have to get rid of the copy of this dabuf in the state.
+		 */
+		ASSERT(state->path.active == 1);
+		ASSERT(state->path.blk[0].bp);
+		xfs_da_buf_done(state->path.blk[0].bp);
+		state->path.blk[0].bp = NULL;
+
+		error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
+						     XFS_ATTR_FORK);
+		if (error)
+			goto out;
+		ASSERT(INT_GET(((xfs_attr_leafblock_t *)
+				      bp->data)->hdr.info.magic, ARCH_CONVERT)
+						       == XFS_ATTR_LEAF_MAGIC);
+
+		if (xfs_attr_shortform_allfit(bp, dp)) {
+			XFS_BMAP_INIT(args->flist, args->firstblock);
+			error = xfs_attr_leaf_to_shortform(bp, args);
+			/* bp is gone due to xfs_da_shrink_inode */
+			if (!error) {
+				error = xfs_bmap_finish(&args->trans,
+							args->flist,
+							*args->firstblock,
+							&committed);
+			}
+			if (error) {
+				ASSERT(committed);
+				args->trans = NULL;
+				xfs_bmap_cancel(args->flist);
+				goto out;
+			}
+
+			/*
+			 * bmap_finish() may have committed the last trans
+			 * and started a new one.  We need the inode to be
+			 * in all transactions.
+			 */
+			if (committed) {
+				xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
+				xfs_trans_ihold(args->trans, dp);
+			}
+		} else
+			xfs_da_brelse(args->trans, bp);
+	}
+	error = 0;
+
+out:
+	xfs_da_state_free(state);
+	return(error);
+}
+
+/*
+ * Fill in the disk block numbers in the state structure for the buffers
+ * that are attached to the state structure.
+ * This is done so that we can quickly reattach ourselves to those buffers
+ * after some set of transaction commit's has released these buffers.
+ */
+STATIC int
+xfs_attr_fillstate(xfs_da_state_t *state)
+{
+	xfs_da_state_path_t *path;
+	xfs_da_state_blk_t *blk;
+	int level;
+
+	/*
+	 * Roll down the "path" in the state structure, storing the on-disk
+	 * block number for those buffers in the "path".
+	 */
+	path = &state->path;
+	ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
+	for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
+		if (blk->bp) {
+			blk->disk_blkno = xfs_da_blkno(blk->bp);
+			xfs_da_buf_done(blk->bp);
+			blk->bp = NULL;
+		} else {
+			blk->disk_blkno = 0;
+		}
+	}
+
+	/*
+	 * Roll down the "altpath" in the state structure, storing the on-disk
+	 * block number for those buffers in the "altpath".
+	 */
+	path = &state->altpath;
+	ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
+	for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
+		if (blk->bp) {
+			blk->disk_blkno = xfs_da_blkno(blk->bp);
+			xfs_da_buf_done(blk->bp);
+			blk->bp = NULL;
+		} else {
+			blk->disk_blkno = 0;
+		}
+	}
+
+	return(0);
+}
+
+/*
+ * Reattach the buffers to the state structure based on the disk block
+ * numbers stored in the state structure.
+ * This is done after some set of transaction commit's has released those
+ * buffers from our grip.
+ */
+STATIC int
+xfs_attr_refillstate(xfs_da_state_t *state)
+{
+	xfs_da_state_path_t *path;
+	xfs_da_state_blk_t *blk;
+	int level, error;
+
+	/*
+	 * Roll down the "path" in the state structure, storing the on-disk
+	 * block number for those buffers in the "path".
+	 */
+	path = &state->path;
+	ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
+	for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
+		if (blk->disk_blkno) {
+			error = xfs_da_read_buf(state->args->trans,
+						state->args->dp,
+						blk->blkno, blk->disk_blkno,
+						&blk->bp, XFS_ATTR_FORK);
+			if (error)
+				return(error);
+		} else {
+			blk->bp = NULL;
+		}
+	}
+
+	/*
+	 * Roll down the "altpath" in the state structure, storing the on-disk
+	 * block number for those buffers in the "altpath".
+	 */
+	path = &state->altpath;
+	ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
+	for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
+		if (blk->disk_blkno) {
+			error = xfs_da_read_buf(state->args->trans,
+						state->args->dp,
+						blk->blkno, blk->disk_blkno,
+						&blk->bp, XFS_ATTR_FORK);
+			if (error)
+				return(error);
+		} else {
+			blk->bp = NULL;
+		}
+	}
+
+	return(0);
+}
+
+/*
+ * Look up a filename in a node attribute list.
+ *
+ * This routine gets called for any attribute fork that has more than one
+ * block, ie: both true Btree attr lists and for single-leaf-blocks with
+ * "remote" values taking up more blocks.
+ */
+int
+xfs_attr_node_get(xfs_da_args_t *args)
+{
+	xfs_da_state_t *state;
+	xfs_da_state_blk_t *blk;
+	int error, retval;
+	int i;
+
+	state = xfs_da_state_alloc();
+	state->args = args;
+	state->mp = args->dp->i_mount;
+	state->blocksize = state->mp->m_sb.sb_blocksize;
+	state->node_ents = state->mp->m_attr_node_ents;
+
+	/*
+	 * Search to see if name exists, and get back a pointer to it.
+	 */
+	error = xfs_da_node_lookup_int(state, &retval);
+	if (error) {
+		retval = error;
+	} else if (retval == EEXIST) {
+		blk = &state->path.blk[ state->path.active-1 ];
+		ASSERT(blk->bp != NULL);
+		ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
+
+		/*
+		 * Get the value, local or "remote"
+		 */
+		retval = xfs_attr_leaf_getvalue(blk->bp, args);
+		if (!retval && (args->rmtblkno > 0)
+		    && !(args->flags & ATTR_KERNOVAL)) {
+			retval = xfs_attr_rmtval_get(args);
+		}
+	}
+
+	/*
+	 * If not in a transaction, we have to release all the buffers.
+	 */
+	for (i = 0; i < state->path.active; i++) {
+		xfs_da_brelse(args->trans, state->path.blk[i].bp);
+		state->path.blk[i].bp = NULL;
+	}
+
+	xfs_da_state_free(state);
+	return(retval);
+}
+
+STATIC int							/* error */
+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;
+	xfs_da_node_entry_t *btree;
+	int error, i;
+	xfs_dabuf_t *bp;
+
+	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_da_read_buf(NULL, context->dp, cursor->blkno, -1,
+					      &bp, XFS_ATTR_FORK);
+		if ((error != 0) && (error != EFSCORRUPTED))
+			return(error);
+		if (bp) {
+			node = bp->data;
+			switch (INT_GET(node->hdr.info.magic, ARCH_CONVERT)) {
+			case XFS_DA_NODE_MAGIC:
+				xfs_attr_trace_l_cn("wrong blk", context, node);
+				xfs_da_brelse(NULL, bp);
+				bp = NULL;
+				break;
+			case XFS_ATTR_LEAF_MAGIC:
+				leaf = bp->data;
+				if (cursor->hashval >
+				    INT_GET(leaf->entries[
+					 INT_GET(leaf->hdr.count,
+						ARCH_CONVERT)-1].hashval,
+							ARCH_CONVERT)) {
+					xfs_attr_trace_l_cl("wrong blk",
+							   context, leaf);
+					xfs_da_brelse(NULL, bp);
+					bp = NULL;
+				} else if (cursor->hashval <=
+					     INT_GET(leaf->entries[0].hashval,
+							ARCH_CONVERT)) {
+					xfs_attr_trace_l_cl("maybe wrong blk",
+							   context, leaf);
+					xfs_da_brelse(NULL, bp);
+					bp = NULL;
+				}
+				break;
+			default:
+				xfs_attr_trace_l_c("wrong blk - ??", context);
+				xfs_da_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 (;;) {
+			error = xfs_da_read_buf(NULL, context->dp,
+						      cursor->blkno, -1, &bp,
+						      XFS_ATTR_FORK);
+			if (error)
+				return(error);
+			if (unlikely(bp == NULL)) {
+				XFS_ERROR_REPORT("xfs_attr_node_list(2)",
+						 XFS_ERRLEVEL_LOW,
+						 context->dp->i_mount);
+				return(XFS_ERROR(EFSCORRUPTED));
+			}
+			node = bp->data;
+			if (INT_GET(node->hdr.info.magic, ARCH_CONVERT)
+							== XFS_ATTR_LEAF_MAGIC)
+				break;
+			if (unlikely(INT_GET(node->hdr.info.magic, ARCH_CONVERT)
+							!= XFS_DA_NODE_MAGIC)) {
+				XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
+						     XFS_ERRLEVEL_LOW,
+						     context->dp->i_mount,
+						     node);
+				xfs_da_brelse(NULL, bp);
+				return(XFS_ERROR(EFSCORRUPTED));
+			}
+			btree = node->btree;
+			for (i = 0;
+				i < INT_GET(node->hdr.count, ARCH_CONVERT);
+								btree++, i++) {
+				if (cursor->hashval
+						<= INT_GET(btree->hashval,
+							    ARCH_CONVERT)) {
+					cursor->blkno = INT_GET(btree->before, ARCH_CONVERT);
+					xfs_attr_trace_l_cb("descending",
+							    context, btree);
+					break;
+				}
+			}
+			if (i == INT_GET(node->hdr.count, ARCH_CONVERT)) {
+				xfs_da_brelse(NULL, bp);
+				return(0);
+			}
+			xfs_da_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->data;
+		if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+						!= XFS_ATTR_LEAF_MAGIC)) {
+			XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
+					     XFS_ERRLEVEL_LOW,
+					     context->dp->i_mount, leaf);
+			xfs_da_brelse(NULL, bp);
+			return(XFS_ERROR(EFSCORRUPTED));
+		}
+		error = xfs_attr_leaf_list_int(bp, context);
+		if (error || !leaf->hdr.info.forw)
+			break;	/* not really an error, buffer full or EOF */
+		cursor->blkno = INT_GET(leaf->hdr.info.forw, ARCH_CONVERT);
+		xfs_da_brelse(NULL, bp);
+		error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
+					      &bp, XFS_ATTR_FORK);
+		if (error)
+			return(error);
+		if (unlikely((bp == NULL))) {
+			XFS_ERROR_REPORT("xfs_attr_node_list(5)",
+					 XFS_ERRLEVEL_LOW,
+					 context->dp->i_mount);
+			return(XFS_ERROR(EFSCORRUPTED));
+		}
+	}
+	xfs_da_brelse(NULL, bp);
+	return(0);
+}
+
+
+/*========================================================================
+ * External routines for manipulating out-of-line attribute values.
+ *========================================================================*/
+
+/*
+ * Read the value associated with an attribute from the out-of-line buffer
+ * that we stored it in.
+ */
+STATIC int
+xfs_attr_rmtval_get(xfs_da_args_t *args)
+{
+	xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
+	xfs_mount_t *mp;
+	xfs_daddr_t dblkno;
+	xfs_caddr_t dst;
+	xfs_buf_t *bp;
+	int nmap, error, tmp, valuelen, blkcnt, i;
+	xfs_dablk_t lblkno;
+
+	ASSERT(!(args->flags & ATTR_KERNOVAL));
+
+	mp = args->dp->i_mount;
+	dst = args->value;
+	valuelen = args->valuelen;
+	lblkno = args->rmtblkno;
+	while (valuelen > 0) {
+		nmap = ATTR_RMTVALUE_MAPSIZE;
+		error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
+				  args->rmtblkcnt,
+				  XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
+				  NULL, 0, map, &nmap, NULL);
+		if (error)
+			return(error);
+		ASSERT(nmap >= 1);
+
+		for (i = 0; (i < nmap) && (valuelen > 0); i++) {
+			ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
+			       (map[i].br_startblock != HOLESTARTBLOCK));
+			dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
+			blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
+			error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
+					     blkcnt, XFS_BUF_LOCK, &bp);
+			if (error)
+				return(error);
+
+			tmp = (valuelen < XFS_BUF_SIZE(bp))
+				? valuelen : XFS_BUF_SIZE(bp);
+			xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
+			xfs_buf_relse(bp);
+			dst += tmp;
+			valuelen -= tmp;
+
+			lblkno += map[i].br_blockcount;
+		}
+	}
+	ASSERT(valuelen == 0);
+	return(0);
+}
+
+/*
+ * Write the value associated with an attribute into the out-of-line buffer
+ * that we have defined for it.
+ */
+STATIC int
+xfs_attr_rmtval_set(xfs_da_args_t *args)
+{
+	xfs_mount_t *mp;
+	xfs_fileoff_t lfileoff;
+	xfs_inode_t *dp;
+	xfs_bmbt_irec_t map;
+	xfs_daddr_t dblkno;
+	xfs_caddr_t src;
+	xfs_buf_t *bp;
+	xfs_dablk_t lblkno;
+	int blkcnt, valuelen, nmap, error, tmp, committed;
+
+	dp = args->dp;
+	mp = dp->i_mount;
+	src = args->value;
+
+	/*
+	 * Find a "hole" in the attribute address space large enough for
+	 * us to drop the new attribute's value into.
+	 */
+	blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
+	lfileoff = 0;
+	error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
+						   XFS_ATTR_FORK);
+	if (error) {
+		return(error);
+	}
+	args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
+	args->rmtblkcnt = blkcnt;
+
+	/*
+	 * Roll through the "value", allocating blocks on disk as required.
+	 */
+	while (blkcnt > 0) {
+		/*
+		 * Allocate a single extent, up to the size of the value.
+		 */
+		XFS_BMAP_INIT(args->flist, args->firstblock);
+		nmap = 1;
+		error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
+				  blkcnt,
+				  XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
+							XFS_BMAPI_WRITE,
+				  args->firstblock, args->total, &map, &nmap,
+				  args->flist);
+		if (!error) {
+			error = xfs_bmap_finish(&args->trans, args->flist,
+						*args->firstblock, &committed);
+		}
+		if (error) {
+			ASSERT(committed);
+			args->trans = NULL;
+			xfs_bmap_cancel(args->flist);
+			return(error);
+		}
+
+		/*
+		 * bmap_finish() may have committed the last trans and started
+		 * a new one.  We need the inode to be in all transactions.
+		 */
+		if (committed) {
+			xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
+			xfs_trans_ihold(args->trans, dp);
+		}
+
+		ASSERT(nmap == 1);
+		ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
+		       (map.br_startblock != HOLESTARTBLOCK));
+		lblkno += map.br_blockcount;
+		blkcnt -= map.br_blockcount;
+
+		/*
+		 * Start the next trans in the chain.
+		 */
+		if ((error = xfs_attr_rolltrans(&args->trans, dp)))
+			return (error);
+	}
+
+	/*
+	 * Roll through the "value", copying the attribute value to the
+	 * already-allocated blocks.  Blocks are written synchronously
+	 * so that we can know they are all on disk before we turn off
+	 * the INCOMPLETE flag.
+	 */
+	lblkno = args->rmtblkno;
+	valuelen = args->valuelen;
+	while (valuelen > 0) {
+		/*
+		 * Try to remember where we decided to put the value.
+		 */
+		XFS_BMAP_INIT(args->flist, args->firstblock);
+		nmap = 1;
+		error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
+				  args->rmtblkcnt,
+				  XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
+				  args->firstblock, 0, &map, &nmap, NULL);
+		if (error) {
+			return(error);
+		}
+		ASSERT(nmap == 1);
+		ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
+		       (map.br_startblock != HOLESTARTBLOCK));
+
+		dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
+		blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
+
+		bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
+							blkcnt, XFS_BUF_LOCK);
+		ASSERT(bp);
+		ASSERT(!XFS_BUF_GETERROR(bp));
+
+		tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
+							XFS_BUF_SIZE(bp);
+		xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
+		if (tmp < XFS_BUF_SIZE(bp))
+			xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
+		if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
+			return (error);
+		}
+		src += tmp;
+		valuelen -= tmp;
+
+		lblkno += map.br_blockcount;
+	}
+	ASSERT(valuelen == 0);
+	return(0);
+}
+
+/*
+ * Remove the value associated with an attribute by deleting the
+ * out-of-line buffer that it is stored on.
+ */
+STATIC int
+xfs_attr_rmtval_remove(xfs_da_args_t *args)
+{
+	xfs_mount_t *mp;
+	xfs_bmbt_irec_t map;
+	xfs_buf_t *bp;
+	xfs_daddr_t dblkno;
+	xfs_dablk_t lblkno;
+	int valuelen, blkcnt, nmap, error, done, committed;
+
+	mp = args->dp->i_mount;
+
+	/*
+	 * Roll through the "value", invalidating the attribute value's
+	 * blocks.
+	 */
+	lblkno = args->rmtblkno;
+	valuelen = args->rmtblkcnt;
+	while (valuelen > 0) {
+		/*
+		 * Try to remember where we decided to put the value.
+		 */
+		XFS_BMAP_INIT(args->flist, args->firstblock);
+		nmap = 1;
+		error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
+					args->rmtblkcnt,
+					XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
+					args->firstblock, 0, &map, &nmap,
+					args->flist);
+		if (error) {
+			return(error);
+		}
+		ASSERT(nmap == 1);
+		ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
+		       (map.br_startblock != HOLESTARTBLOCK));
+
+		dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
+		blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
+
+		/*
+		 * If the "remote" value is in the cache, remove it.
+		 */
+		bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
+				XFS_INCORE_TRYLOCK);
+		if (bp) {
+			XFS_BUF_STALE(bp);
+			XFS_BUF_UNDELAYWRITE(bp);
+			xfs_buf_relse(bp);
+			bp = NULL;
+		}
+
+		valuelen -= map.br_blockcount;
+
+		lblkno += map.br_blockcount;
+	}
+
+	/*
+	 * Keep de-allocating extents until the remote-value region is gone.
+	 */
+	lblkno = args->rmtblkno;
+	blkcnt = args->rmtblkcnt;
+	done = 0;
+	while (!done) {
+		XFS_BMAP_INIT(args->flist, args->firstblock);
+		error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
+				    XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
+				    1, args->firstblock, args->flist, &done);
+		if (!error) {
+			error = xfs_bmap_finish(&args->trans, args->flist,
+						*args->firstblock, &committed);
+		}
+		if (error) {
+			ASSERT(committed);
+			args->trans = NULL;
+			xfs_bmap_cancel(args->flist);
+			return(error);
+		}
+
+		/*
+		 * bmap_finish() may have committed the last trans and started
+		 * a new one.  We need the inode to be in all transactions.
+		 */
+		if (committed) {
+			xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
+			xfs_trans_ihold(args->trans, args->dp);
+		}
+
+		/*
+		 * Close out trans and start the next one in the chain.
+		 */
+		if ((error = xfs_attr_rolltrans(&args->trans, args->dp)))
+			return (error);
+	}
+	return(0);
+}
+
+#if defined(XFS_ATTR_TRACE)
+/*
+ * Add a trace buffer entry for an attr_list context structure.
+ */
+void
+xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context)
+{
+	xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where,
+		(__psunsigned_t)context->dp,
+		(__psunsigned_t)context->cursor->hashval,
+		(__psunsigned_t)context->cursor->blkno,
+		(__psunsigned_t)context->cursor->offset,
+		(__psunsigned_t)context->alist,
+		(__psunsigned_t)context->bufsize,
+		(__psunsigned_t)context->count,
+		(__psunsigned_t)context->firstu,
+		(__psunsigned_t)
+			((context->count > 0) &&
+			!(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
+				? (ATTR_ENTRY(context->alist,
+					      context->count-1)->a_valuelen)
+				: 0,
+		(__psunsigned_t)context->dupcnt,
+		(__psunsigned_t)context->flags,
+		(__psunsigned_t)NULL,
+		(__psunsigned_t)NULL,
+		(__psunsigned_t)NULL);
+}
+
+/*
+ * Add a trace buffer entry for a context structure and a Btree node.
+ */
+void
+xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
+			 struct xfs_da_intnode *node)
+{
+	xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where,
+		(__psunsigned_t)context->dp,
+		(__psunsigned_t)context->cursor->hashval,
+		(__psunsigned_t)context->cursor->blkno,
+		(__psunsigned_t)context->cursor->offset,
+		(__psunsigned_t)context->alist,
+		(__psunsigned_t)context->bufsize,
+		(__psunsigned_t)context->count,
+		(__psunsigned_t)context->firstu,
+		(__psunsigned_t)
+			((context->count > 0) &&
+			!(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
+				? (ATTR_ENTRY(context->alist,
+					      context->count-1)->a_valuelen)
+				: 0,
+		(__psunsigned_t)context->dupcnt,
+		(__psunsigned_t)context->flags,
+		(__psunsigned_t)INT_GET(node->hdr.count, ARCH_CONVERT),
+		(__psunsigned_t)INT_GET(node->btree[0].hashval, ARCH_CONVERT),
+		(__psunsigned_t)INT_GET(node->btree[INT_GET(node->hdr.count, ARCH_CONVERT)-1].hashval, ARCH_CONVERT));
+}
+
+/*
+ * Add a trace buffer entry for a context structure and a Btree element.
+ */
+void
+xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
+			  struct xfs_da_node_entry *btree)
+{
+	xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where,
+		(__psunsigned_t)context->dp,
+		(__psunsigned_t)context->cursor->hashval,
+		(__psunsigned_t)context->cursor->blkno,
+		(__psunsigned_t)context->cursor->offset,
+		(__psunsigned_t)context->alist,
+		(__psunsigned_t)context->bufsize,
+		(__psunsigned_t)context->count,
+		(__psunsigned_t)context->firstu,
+		(__psunsigned_t)
+			((context->count > 0) &&
+			!(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
+				? (ATTR_ENTRY(context->alist,
+					      context->count-1)->a_valuelen)
+				: 0,
+		(__psunsigned_t)context->dupcnt,
+		(__psunsigned_t)context->flags,
+		(__psunsigned_t)INT_GET(btree->hashval, ARCH_CONVERT),
+		(__psunsigned_t)INT_GET(btree->before, ARCH_CONVERT),
+		(__psunsigned_t)NULL);
+}
+
+/*
+ * Add a trace buffer entry for a context structure and a leaf block.
+ */
+void
+xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
+			      struct xfs_attr_leafblock *leaf)
+{
+	xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where,
+		(__psunsigned_t)context->dp,
+		(__psunsigned_t)context->cursor->hashval,
+		(__psunsigned_t)context->cursor->blkno,
+		(__psunsigned_t)context->cursor->offset,
+		(__psunsigned_t)context->alist,
+		(__psunsigned_t)context->bufsize,
+		(__psunsigned_t)context->count,
+		(__psunsigned_t)context->firstu,
+		(__psunsigned_t)
+			((context->count > 0) &&
+			!(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
+				? (ATTR_ENTRY(context->alist,
+					      context->count-1)->a_valuelen)
+				: 0,
+		(__psunsigned_t)context->dupcnt,
+		(__psunsigned_t)context->flags,
+		(__psunsigned_t)INT_GET(leaf->hdr.count, ARCH_CONVERT),
+		(__psunsigned_t)INT_GET(leaf->entries[0].hashval, ARCH_CONVERT),
+		(__psunsigned_t)INT_GET(leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT)-1].hashval, ARCH_CONVERT));
+}
+
+/*
+ * Add a trace buffer entry for the arguments given to the routine,
+ * generic form.
+ */
+void
+xfs_attr_trace_enter(int type, char *where,
+			 __psunsigned_t a2, __psunsigned_t a3,
+			 __psunsigned_t a4, __psunsigned_t a5,
+			 __psunsigned_t a6, __psunsigned_t a7,
+			 __psunsigned_t a8, __psunsigned_t a9,
+			 __psunsigned_t a10, __psunsigned_t a11,
+			 __psunsigned_t a12, __psunsigned_t a13,
+			 __psunsigned_t a14, __psunsigned_t a15)
+{
+	ASSERT(xfs_attr_trace_buf);
+	ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type),
+					 (void *)where,
+					 (void *)a2,  (void *)a3,  (void *)a4,
+					 (void *)a5,  (void *)a6,  (void *)a7,
+					 (void *)a8,  (void *)a9,  (void *)a10,
+					 (void *)a11, (void *)a12, (void *)a13,
+					 (void *)a14, (void *)a15);
+}
+#endif	/* XFS_ATTR_TRACE */
+
+
+/*========================================================================
+ * System (pseudo) namespace attribute interface routines.
+ *========================================================================*/
+
+STATIC int
+posix_acl_access_set(
+	vnode_t	*vp, char *name, void *data, size_t size, int xflags)
+{
+	return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS);
+}
+
+STATIC int
+posix_acl_access_remove(
+	struct vnode *vp, char *name, int xflags)
+{
+	return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
+}
+
+STATIC int
+posix_acl_access_get(
+	vnode_t *vp, char *name, void *data, size_t size, int xflags)
+{
+	return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS);
+}
+
+STATIC int
+posix_acl_access_exists(
+	vnode_t *vp)
+{
+	return xfs_acl_vhasacl_access(vp);
+}
+
+STATIC int
+posix_acl_default_set(
+	vnode_t	*vp, char *name, void *data, size_t size, int xflags)
+{
+	return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT);
+}
+
+STATIC int
+posix_acl_default_get(
+	vnode_t *vp, char *name, void *data, size_t size, int xflags)
+{
+	return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT);
+}
+
+STATIC int
+posix_acl_default_remove(
+	struct vnode *vp, char *name, int xflags)
+{
+	return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT);
+}
+
+STATIC int
+posix_acl_default_exists(
+	vnode_t *vp)
+{
+	return xfs_acl_vhasacl_default(vp);
+}
+
+struct attrnames posix_acl_access = {
+	.attr_name	= "posix_acl_access",
+	.attr_namelen	= sizeof("posix_acl_access") - 1,
+	.attr_get	= posix_acl_access_get,
+	.attr_set	= posix_acl_access_set,
+	.attr_remove	= posix_acl_access_remove,
+	.attr_exists	= posix_acl_access_exists,
+};
+
+struct attrnames posix_acl_default = {
+	.attr_name	= "posix_acl_default",
+	.attr_namelen	= sizeof("posix_acl_default") - 1,
+	.attr_get	= posix_acl_default_get,
+	.attr_set	= posix_acl_default_set,
+	.attr_remove	= posix_acl_default_remove,
+	.attr_exists	= posix_acl_default_exists,
+};
+
+struct attrnames *attr_system_names[] =
+	{ &posix_acl_access, &posix_acl_default };
+
+
+/*========================================================================
+ * Namespace-prefix-style attribute name interface routines.
+ *========================================================================*/
+
+STATIC int
+attr_generic_set(
+	struct vnode *vp, char *name, void *data, size_t size, int xflags)
+{
+	int 	error;
+
+	VOP_ATTR_SET(vp, name, data, size, xflags, NULL, error);
+	return -error;
+}
+
+STATIC int
+attr_generic_get(
+	struct vnode *vp, char *name, void *data, size_t size, int xflags)
+{
+	int	error, asize = size;
+
+	VOP_ATTR_GET(vp, name, data, &asize, xflags, NULL, error);
+	if (!error)
+		return asize;
+	return -error;
+}
+
+STATIC int
+attr_generic_remove(
+	struct vnode *vp, char *name, int xflags)
+{
+	int	error;
+
+	VOP_ATTR_REMOVE(vp, name, xflags, NULL, error);
+	return -error;
+}
+
+STATIC int
+attr_generic_listadd(
+	attrnames_t		*prefix,
+	attrnames_t		*namesp,
+	void			*data,
+	size_t			size,
+	ssize_t			*result)
+{
+	char			*p = data + *result;
+
+	*result += prefix->attr_namelen;
+	*result += namesp->attr_namelen + 1;
+	if (!size)
+		return 0;
+	if (*result > size)
+		return -ERANGE;
+	strcpy(p, prefix->attr_name);
+	p += prefix->attr_namelen;
+	strcpy(p, namesp->attr_name);
+	p += namesp->attr_namelen + 1;
+	return 0;
+}
+
+STATIC int
+attr_system_list(
+	struct vnode		*vp,
+	void			*data,
+	size_t			size,
+	ssize_t			*result)
+{
+	attrnames_t		*namesp;
+	int			i, error = 0;
+
+	for (i = 0; i < ATTR_SYSCOUNT; i++) {
+		namesp = attr_system_names[i];
+		if (!namesp->attr_exists || !namesp->attr_exists(vp))
+			continue;
+		error = attr_generic_listadd(&attr_system, namesp,
+						data, size, result);
+		if (error)
+			break;
+	}
+	return error;
+}
+
+int
+attr_generic_list(
+	struct vnode *vp, void *data, size_t size, int xflags, ssize_t *result)
+{
+	attrlist_cursor_kern_t	cursor = { 0 };
+	int			error;
+
+	VOP_ATTR_LIST(vp, data, size, xflags, &cursor, NULL, error);
+	if (error > 0)
+		return -error;
+	*result = -error;
+	return attr_system_list(vp, data, size, result);
+}
+
+attrnames_t *
+attr_lookup_namespace(
+	char			*name,
+	struct attrnames	**names,
+	int			nnames)
+{
+	int			i;
+
+	for (i = 0; i < nnames; i++)
+		if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen))
+			return names[i];
+	return NULL;
+}
+
+/*
+ * Some checks to prevent people abusing EAs to get over quota:
+ * - Don't allow modifying user EAs on devices/symlinks;
+ * - Don't allow modifying user EAs if sticky bit set;
+ */
+STATIC int
+attr_user_capable(
+	struct vnode	*vp,
+	cred_t		*cred)
+{
+	struct inode	*inode = LINVFS_GET_IP(vp);
+
+	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+		return -EPERM;
+	if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
+	    !capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
+	    (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
+		return -EPERM;
+	return 0;
+}
+
+STATIC int
+attr_trusted_capable(
+	struct vnode	*vp,
+	cred_t		*cred)
+{
+	struct inode	*inode = LINVFS_GET_IP(vp);
+
+	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+		return -EPERM;
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+	return 0;
+}
+
+STATIC int
+attr_secure_capable(
+	struct vnode	*vp,
+	cred_t		*cred)
+{
+	return -ENOSECURITY;
+}
+
+STATIC int
+attr_system_set(
+	struct vnode *vp, char *name, void *data, size_t size, int xflags)
+{
+	attrnames_t	*namesp;
+	int		error;
+
+	if (xflags & ATTR_CREATE)
+		return -EINVAL;
+
+	namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
+	if (!namesp)
+		return -EOPNOTSUPP;
+	error = namesp->attr_set(vp, name, data, size, xflags);
+	if (!error)
+		error = vn_revalidate(vp);
+	return error;
+}
+
+STATIC int
+attr_system_get(
+	struct vnode *vp, char *name, void *data, size_t size, int xflags)
+{
+	attrnames_t	*namesp;
+
+	namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
+	if (!namesp)
+		return -EOPNOTSUPP;
+	return namesp->attr_get(vp, name, data, size, xflags);
+}
+
+STATIC int
+attr_system_remove(
+	struct vnode *vp, char *name, int xflags)
+{
+	attrnames_t	*namesp;
+
+	namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
+	if (!namesp)
+		return -EOPNOTSUPP;
+	return namesp->attr_remove(vp, name, xflags);
+}
+
+struct attrnames attr_system = {
+	.attr_name	= "system.",
+	.attr_namelen	= sizeof("system.") - 1,
+	.attr_flag	= ATTR_SYSTEM,
+	.attr_get	= attr_system_get,
+	.attr_set	= attr_system_set,
+	.attr_remove	= attr_system_remove,
+	.attr_capable	= (attrcapable_t)fs_noerr,
+};
+
+struct attrnames attr_trusted = {
+	.attr_name	= "trusted.",
+	.attr_namelen	= sizeof("trusted.") - 1,
+	.attr_flag	= ATTR_ROOT,
+	.attr_get	= attr_generic_get,
+	.attr_set	= attr_generic_set,
+	.attr_remove	= attr_generic_remove,
+	.attr_capable	= attr_trusted_capable,
+};
+
+struct attrnames attr_secure = {
+	.attr_name	= "security.",
+	.attr_namelen	= sizeof("security.") - 1,
+	.attr_flag	= ATTR_SECURE,
+	.attr_get	= attr_generic_get,
+	.attr_set	= attr_generic_set,
+	.attr_remove	= attr_generic_remove,
+	.attr_capable	= attr_secure_capable,
+};
+
+struct attrnames attr_user = {
+	.attr_name	= "user.",
+	.attr_namelen	= sizeof("user.") - 1,
+	.attr_get	= attr_generic_get,
+	.attr_set	= attr_generic_set,
+	.attr_remove	= attr_generic_remove,
+	.attr_capable	= attr_user_capable,
+};
+
+struct attrnames *attr_namespaces[] =
+	{ &attr_system, &attr_trusted, &attr_secure, &attr_user };