patch-2.4.25 linux-2.4.25/fs/xfs/xfs_attr_leaf.c
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- Lines: 3036
- Date:
2004-02-18 05:36:32.000000000 -0800
- Orig file:
linux-2.4.24/fs/xfs/xfs_attr_leaf.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.24/fs/xfs/xfs_attr_leaf.c linux-2.4.25/fs/xfs/xfs_attr_leaf.c
@@ -0,0 +1,3035 @@
+/*
+ * Copyright (c) 2000-2003 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/
+ */
+/*
+ * xfs_attr_leaf.c
+ *
+ * GROT: figure out how to recover gracefully when bmap returns ENOSPC.
+ */
+
+#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"
+
+/*
+ * xfs_attr_leaf.c
+ *
+ * Routines to implement leaf blocks of attributes as Btrees of hashed names.
+ */
+
+/*========================================================================
+ * Function prototypes for the kernel.
+ *========================================================================*/
+
+/*
+ * Routines used for growing the Btree.
+ */
+STATIC int xfs_attr_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args,
+ int freemap_index);
+STATIC void xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer);
+STATIC void xfs_attr_leaf_rebalance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2);
+STATIC int xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *leaf_blk_1,
+ xfs_da_state_blk_t *leaf_blk_2,
+ int *number_entries_in_blk1,
+ int *number_usedbytes_in_blk1);
+
+/*
+ * Utility routines.
+ */
+STATIC void xfs_attr_leaf_moveents(xfs_attr_leafblock_t *src_leaf,
+ int src_start,
+ xfs_attr_leafblock_t *dst_leaf,
+ int dst_start, int move_count,
+ xfs_mount_t *mp);
+
+
+/*========================================================================
+ * External routines when dirsize < XFS_LITINO(mp).
+ *========================================================================*/
+
+/*
+ * Create the initial contents of a shortform attribute list.
+ */
+int
+xfs_attr_shortform_create(xfs_da_args_t *args)
+{
+ xfs_attr_sf_hdr_t *hdr;
+ xfs_inode_t *dp;
+ xfs_ifork_t *ifp;
+
+ dp = args->dp;
+ ASSERT(dp != NULL);
+ ifp = dp->i_afp;
+ ASSERT(ifp != NULL);
+ ASSERT(ifp->if_bytes == 0);
+ if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) {
+ ifp->if_flags &= ~XFS_IFEXTENTS; /* just in case */
+ dp->i_d.di_aformat = XFS_DINODE_FMT_LOCAL;
+ ifp->if_flags |= XFS_IFINLINE;
+ } else {
+ ASSERT(ifp->if_flags & XFS_IFINLINE);
+ }
+ xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK);
+ hdr = (xfs_attr_sf_hdr_t *)ifp->if_u1.if_data;
+ INT_ZERO(hdr->count, ARCH_CONVERT);
+ INT_SET(hdr->totsize, ARCH_CONVERT, sizeof(*hdr));
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
+ return(0);
+}
+
+/*
+ * Add a name/value pair to the shortform attribute list.
+ * Overflow from the inode has already been checked for.
+ */
+int
+xfs_attr_shortform_add(xfs_da_args_t *args)
+{
+ xfs_attr_shortform_t *sf;
+ xfs_attr_sf_entry_t *sfe;
+ int i, offset, size;
+ xfs_inode_t *dp;
+ xfs_ifork_t *ifp;
+
+ dp = args->dp;
+ ifp = dp->i_afp;
+ ASSERT(ifp->if_flags & XFS_IFINLINE);
+ sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
+ sfe = &sf->list[0];
+ for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
+ if (sfe->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
+ continue;
+ if (((args->flags & ATTR_SECURE) != 0) !=
+ ((sfe->flags & XFS_ATTR_SECURE) != 0))
+ continue;
+ if (((args->flags & ATTR_ROOT) != 0) !=
+ ((sfe->flags & XFS_ATTR_ROOT) != 0))
+ continue;
+ return(XFS_ERROR(EEXIST));
+ }
+
+ offset = (char *)sfe - (char *)sf;
+ size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
+ xfs_idata_realloc(dp, size, XFS_ATTR_FORK);
+ sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
+ sfe = (xfs_attr_sf_entry_t *)((char *)sf + offset);
+
+ sfe->namelen = args->namelen;
+ INT_SET(sfe->valuelen, ARCH_CONVERT, args->valuelen);
+ sfe->flags = (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE :
+ ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0);
+ memcpy(sfe->nameval, args->name, args->namelen);
+ memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen);
+ INT_MOD(sf->hdr.count, ARCH_CONVERT, 1);
+ INT_MOD(sf->hdr.totsize, ARCH_CONVERT, size);
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
+
+ return(0);
+}
+
+/*
+ * Remove a name from the shortform attribute list structure.
+ */
+int
+xfs_attr_shortform_remove(xfs_da_args_t *args)
+{
+ xfs_attr_shortform_t *sf;
+ xfs_attr_sf_entry_t *sfe;
+ int base, size=0, end, totsize, i;
+ xfs_inode_t *dp;
+
+ /*
+ * Remove the attribute.
+ */
+ dp = args->dp;
+ base = sizeof(xfs_attr_sf_hdr_t);
+ sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
+ sfe = &sf->list[0];
+ for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
+ base += size, i++) {
+ size = XFS_ATTR_SF_ENTSIZE(sfe);
+ if (sfe->namelen != args->namelen)
+ continue;
+ if (memcmp(sfe->nameval, args->name, args->namelen) != 0)
+ continue;
+ if (((args->flags & ATTR_SECURE) != 0) !=
+ ((sfe->flags & XFS_ATTR_SECURE) != 0))
+ continue;
+ if (((args->flags & ATTR_ROOT) != 0) !=
+ ((sfe->flags & XFS_ATTR_ROOT) != 0))
+ continue;
+ break;
+ }
+ if (i == INT_GET(sf->hdr.count, ARCH_CONVERT))
+ return(XFS_ERROR(ENOATTR));
+
+ end = base + size;
+ totsize = INT_GET(sf->hdr.totsize, ARCH_CONVERT);
+ if (end != totsize) {
+ memmove(&((char *)sf)[base], &((char *)sf)[end],
+ totsize - end);
+ }
+ INT_MOD(sf->hdr.count, ARCH_CONVERT, -1);
+ INT_MOD(sf->hdr.totsize, ARCH_CONVERT, -size);
+ xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
+
+ return(0);
+}
+
+/*
+ * Look up a name in a shortform attribute list structure.
+ */
+/*ARGSUSED*/
+int
+xfs_attr_shortform_lookup(xfs_da_args_t *args)
+{
+ xfs_attr_shortform_t *sf;
+ xfs_attr_sf_entry_t *sfe;
+ int i;
+ xfs_ifork_t *ifp;
+
+ ifp = args->dp->i_afp;
+ ASSERT(ifp->if_flags & XFS_IFINLINE);
+ sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
+ sfe = &sf->list[0];
+ for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
+ if (sfe->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
+ continue;
+ if (((args->flags & ATTR_SECURE) != 0) !=
+ ((sfe->flags & XFS_ATTR_SECURE) != 0))
+ continue;
+ if (((args->flags & ATTR_ROOT) != 0) !=
+ ((sfe->flags & XFS_ATTR_ROOT) != 0))
+ continue;
+ return(XFS_ERROR(EEXIST));
+ }
+ return(XFS_ERROR(ENOATTR));
+}
+
+/*
+ * Look up a name in a shortform attribute list structure.
+ */
+/*ARGSUSED*/
+int
+xfs_attr_shortform_getvalue(xfs_da_args_t *args)
+{
+ xfs_attr_shortform_t *sf;
+ xfs_attr_sf_entry_t *sfe;
+ int i;
+
+ ASSERT(args->dp->i_d.di_aformat == XFS_IFINLINE);
+ sf = (xfs_attr_shortform_t *)args->dp->i_afp->if_u1.if_data;
+ sfe = &sf->list[0];
+ for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT);
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
+ if (sfe->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
+ continue;
+ if (((args->flags & ATTR_SECURE) != 0) !=
+ ((sfe->flags & XFS_ATTR_SECURE) != 0))
+ continue;
+ if (((args->flags & ATTR_ROOT) != 0) !=
+ ((sfe->flags & XFS_ATTR_ROOT) != 0))
+ continue;
+ if (args->flags & ATTR_KERNOVAL) {
+ args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
+ return(XFS_ERROR(EEXIST));
+ }
+ if (args->valuelen < INT_GET(sfe->valuelen, ARCH_CONVERT)) {
+ args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
+ return(XFS_ERROR(ERANGE));
+ }
+ args->valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
+ memcpy(args->value, &sfe->nameval[args->namelen],
+ args->valuelen);
+ return(XFS_ERROR(EEXIST));
+ }
+ return(XFS_ERROR(ENOATTR));
+}
+
+/*
+ * Convert from using the shortform to the leaf.
+ */
+int
+xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
+{
+ xfs_inode_t *dp;
+ xfs_attr_shortform_t *sf;
+ xfs_attr_sf_entry_t *sfe;
+ xfs_da_args_t nargs;
+ char *tmpbuffer;
+ int error, i, size;
+ xfs_dablk_t blkno;
+ xfs_dabuf_t *bp;
+ xfs_ifork_t *ifp;
+
+ dp = args->dp;
+ ifp = dp->i_afp;
+ sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
+ size = INT_GET(sf->hdr.totsize, ARCH_CONVERT);
+ tmpbuffer = kmem_alloc(size, KM_SLEEP);
+ ASSERT(tmpbuffer != NULL);
+ memcpy(tmpbuffer, ifp->if_u1.if_data, size);
+ sf = (xfs_attr_shortform_t *)tmpbuffer;
+
+ xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
+ bp = NULL;
+ error = xfs_da_grow_inode(args, &blkno);
+ if (error) {
+ /*
+ * If we hit an IO error middle of the transaction inside
+ * grow_inode(), we may have inconsistent data. Bail out.
+ */
+ if (error == EIO)
+ goto out;
+ xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
+ memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */
+ goto out;
+ }
+
+ ASSERT(blkno == 0);
+ error = xfs_attr_leaf_create(args, blkno, &bp);
+ if (error) {
+ error = xfs_da_shrink_inode(args, 0, bp);
+ bp = NULL;
+ if (error)
+ goto out;
+ xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
+ memcpy(ifp->if_u1.if_data, tmpbuffer, size); /* it back */
+ goto out;
+ }
+
+ memset((char *)&nargs, 0, sizeof(nargs));
+ nargs.dp = dp;
+ nargs.firstblock = args->firstblock;
+ nargs.flist = args->flist;
+ nargs.total = args->total;
+ nargs.whichfork = XFS_ATTR_FORK;
+ nargs.trans = args->trans;
+ nargs.oknoent = 1;
+
+ sfe = &sf->list[0];
+ for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
+ nargs.name = (char *)sfe->nameval;
+ nargs.namelen = sfe->namelen;
+ nargs.value = (char *)&sfe->nameval[nargs.namelen];
+ nargs.valuelen = INT_GET(sfe->valuelen, ARCH_CONVERT);
+ nargs.hashval = xfs_da_hashname((char *)sfe->nameval,
+ sfe->namelen);
+ nargs.flags = (sfe->flags & XFS_ATTR_SECURE) ? ATTR_SECURE :
+ ((sfe->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0);
+ error = xfs_attr_leaf_lookup_int(bp, &nargs); /* set a->index */
+ ASSERT(error == ENOATTR);
+ error = xfs_attr_leaf_add(bp, &nargs);
+ ASSERT(error != ENOSPC);
+ if (error)
+ goto out;
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
+ }
+ error = 0;
+
+out:
+ if(bp)
+ xfs_da_buf_done(bp);
+ kmem_free(tmpbuffer, size);
+ return(error);
+}
+
+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 (INT_GET(sa->hash, ARCH_CONVERT)
+ < INT_GET(sb->hash, ARCH_CONVERT)) {
+ return(-1);
+ } else if (INT_GET(sa->hash, ARCH_CONVERT)
+ > INT_GET(sb->hash, ARCH_CONVERT)) {
+ return(1);
+ } else {
+ return(sa->entno - sb->entno);
+ }
+}
+
+/*
+ * Copy out entries of shortform attribute lists for attr_list().
+ * Shortform atrtribute 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.
+ */
+/*ARGSUSED*/
+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;
+
+ 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 (INT_ISZERO(sf->hdr.count, ARCH_CONVERT))
+ return(0);
+ cursor = context->cursor;
+ ASSERT(cursor != NULL);
+
+ xfs_attr_trace_l_c("sf start", context);
+
+ /*
+ * If the buffer is large enough, do not bother with sorting.
+ * Note the generous fudge factor of 16 overhead bytes per entry.
+ */
+ if ((dp->i_afp->if_bytes + INT_GET(sf->hdr.count, ARCH_CONVERT) * 16)
+ < context->bufsize) {
+ for (i = 0, sfe = &sf->list[0];
+ i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
+ attrnames_t *namesp;
+
+ if (((context->flags & ATTR_ROOT) != 0) !=
+ ((sfe->flags & XFS_ATTR_ROOT) != 0) &&
+ !(context->flags & ATTR_KERNFULLS)) {
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
+ continue;
+ }
+ namesp = (sfe->flags & XFS_ATTR_SECURE) ? &attr_secure:
+ ((sfe->flags & XFS_ATTR_ROOT) ? &attr_trusted :
+ &attr_user);
+ if (context->flags & ATTR_KERNOVAL) {
+ ASSERT(context->flags & ATTR_KERNAMELS);
+ context->count += namesp->attr_namelen +
+ INT_GET(sfe->namelen, ARCH_CONVERT) + 1;
+ }
+ else {
+ if (xfs_attr_put_listent(context, namesp,
+ (char *)sfe->nameval,
+ (int)sfe->namelen,
+ (int)INT_GET(sfe->valuelen,
+ ARCH_CONVERT)))
+ break;
+ }
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
+ }
+ xfs_attr_trace_l_c("sf big-gulp", context);
+ return(0);
+ }
+
+ /*
+ * It didn't all fit, so we have to sort everything on hashval.
+ */
+ sbsize = INT_GET(sf->hdr.count, ARCH_CONVERT) * sizeof(*sbuf);
+ sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP);
+
+ /*
+ * 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 < INT_GET(sf->hdr.count, ARCH_CONVERT); 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);
+ xfs_attr_trace_l_c("sf corrupted", context);
+ kmem_free(sbuf, sbsize);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ if (((context->flags & ATTR_ROOT) != 0) !=
+ ((sfe->flags & XFS_ATTR_ROOT) != 0) &&
+ !(context->flags & ATTR_KERNFULLS)) {
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
+ continue;
+ }
+ sbp->entno = i;
+ INT_SET(sbp->hash, ARCH_CONVERT,
+ xfs_da_hashname((char *)sfe->nameval, sfe->namelen));
+ sbp->name = (char *)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.
+ */
+ qsort(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 (INT_GET(sbp->hash, ARCH_CONVERT) == cursor->hashval) {
+ if (cursor->offset == count) {
+ break;
+ }
+ count++;
+ } else if (INT_GET(sbp->hash, ARCH_CONVERT) > cursor->hashval) {
+ break;
+ }
+ }
+ if (i == nsbuf) {
+ kmem_free(sbuf, sbsize);
+ xfs_attr_trace_l_c("blk end", context);
+ return(0);
+ }
+
+ /*
+ * Loop putting entries into the user buffer.
+ */
+ for ( ; i < nsbuf; i++, sbp++) {
+ attrnames_t *namesp;
+
+ namesp = (sfe->flags & XFS_ATTR_SECURE) ? &attr_secure :
+ ((sfe->flags & XFS_ATTR_ROOT) ? &attr_trusted :
+ &attr_user);
+
+ if (cursor->hashval != INT_GET(sbp->hash, ARCH_CONVERT)) {
+ cursor->hashval = INT_GET(sbp->hash, ARCH_CONVERT);
+ cursor->offset = 0;
+ }
+ if (context->flags & ATTR_KERNOVAL) {
+ ASSERT(context->flags & ATTR_KERNAMELS);
+ context->count += namesp->attr_namelen +
+ sbp->namelen + 1;
+ }
+ else {
+ if (xfs_attr_put_listent(context, namesp,
+ sbp->name, sbp->namelen,
+ INT_GET(sbp->valuelen, ARCH_CONVERT)))
+ break;
+ }
+ cursor->offset++;
+ }
+
+ kmem_free(sbuf, sbsize);
+ xfs_attr_trace_l_c("sf E-O-F", context);
+ return(0);
+}
+
+/*
+ * Check a leaf attribute block to see if all the entries would fit into
+ * a shortform attribute list.
+ */
+int
+xfs_attr_shortform_allfit(xfs_dabuf_t *bp, xfs_inode_t *dp)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_entry_t *entry;
+ xfs_attr_leaf_name_local_t *name_loc;
+ int bytes, i;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+
+ entry = &leaf->entries[0];
+ bytes = sizeof(struct xfs_attr_sf_hdr);
+ for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
+ if (entry->flags & XFS_ATTR_INCOMPLETE)
+ continue; /* don't copy partial entries */
+ if (!(entry->flags & XFS_ATTR_LOCAL))
+ return(0);
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
+ if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX)
+ return(0);
+ if (INT_GET(name_loc->valuelen, ARCH_CONVERT) >= XFS_ATTR_SF_ENTSIZE_MAX)
+ return(0);
+ bytes += sizeof(struct xfs_attr_sf_entry)-1
+ + name_loc->namelen
+ + INT_GET(name_loc->valuelen, ARCH_CONVERT);
+ }
+ return( bytes < XFS_IFORK_ASIZE(dp) );
+}
+
+/*
+ * Convert a leaf attribute list to shortform attribute list
+ */
+int
+xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_entry_t *entry;
+ xfs_attr_leaf_name_local_t *name_loc;
+ xfs_da_args_t nargs;
+ xfs_inode_t *dp;
+ char *tmpbuffer;
+ int error, i;
+
+ dp = args->dp;
+ tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP);
+ ASSERT(tmpbuffer != NULL);
+
+ ASSERT(bp != NULL);
+ memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount));
+ leaf = (xfs_attr_leafblock_t *)tmpbuffer;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ memset(bp->data, 0, XFS_LBSIZE(dp->i_mount));
+
+ /*
+ * Clean out the prior contents of the attribute list.
+ */
+ error = xfs_da_shrink_inode(args, 0, bp);
+ if (error)
+ goto out;
+ error = xfs_attr_shortform_create(args);
+ if (error)
+ goto out;
+
+ /*
+ * Copy the attributes
+ */
+ memset((char *)&nargs, 0, sizeof(nargs));
+ nargs.dp = dp;
+ nargs.firstblock = args->firstblock;
+ nargs.flist = args->flist;
+ nargs.total = args->total;
+ nargs.whichfork = XFS_ATTR_FORK;
+ nargs.trans = args->trans;
+ nargs.oknoent = 1;
+ entry = &leaf->entries[0];
+ for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
+ if (entry->flags & XFS_ATTR_INCOMPLETE)
+ continue; /* don't copy partial entries */
+ if (INT_ISZERO(entry->nameidx, ARCH_CONVERT))
+ continue;
+ ASSERT(entry->flags & XFS_ATTR_LOCAL);
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
+ nargs.name = (char *)name_loc->nameval;
+ nargs.namelen = name_loc->namelen;
+ nargs.value = (char *)&name_loc->nameval[nargs.namelen];
+ nargs.valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT);
+ nargs.hashval = INT_GET(entry->hashval, ARCH_CONVERT);
+ nargs.flags = (entry->flags & XFS_ATTR_SECURE) ? ATTR_SECURE :
+ ((entry->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0);
+ xfs_attr_shortform_add(&nargs);
+ }
+ error = 0;
+
+out:
+ kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount));
+ return(error);
+}
+
+/*
+ * Convert from using a single leaf to a root node and a leaf.
+ */
+int
+xfs_attr_leaf_to_node(xfs_da_args_t *args)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_da_intnode_t *node;
+ xfs_inode_t *dp;
+ xfs_dabuf_t *bp1, *bp2;
+ xfs_dablk_t blkno;
+ int error;
+
+ dp = args->dp;
+ bp1 = bp2 = NULL;
+ error = xfs_da_grow_inode(args, &blkno);
+ if (error)
+ goto out;
+ error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1,
+ XFS_ATTR_FORK);
+ if (error)
+ goto out;
+ ASSERT(bp1 != NULL);
+ bp2 = NULL;
+ error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp2,
+ XFS_ATTR_FORK);
+ if (error)
+ goto out;
+ ASSERT(bp2 != NULL);
+ memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount));
+ xfs_da_buf_done(bp1);
+ bp1 = NULL;
+ xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1);
+
+ /*
+ * Set up the new root node.
+ */
+ error = xfs_da_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK);
+ if (error)
+ goto out;
+ node = bp1->data;
+ leaf = bp2->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ /* both on-disk, don't endian-flip twice */
+ node->btree[0].hashval =
+ leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval;
+ INT_SET(node->btree[0].before, ARCH_CONVERT, blkno);
+ INT_SET(node->hdr.count, ARCH_CONVERT, 1);
+ xfs_da_log_buf(args->trans, bp1, 0, XFS_LBSIZE(dp->i_mount) - 1);
+ error = 0;
+out:
+ if (bp1)
+ xfs_da_buf_done(bp1);
+ if (bp2)
+ xfs_da_buf_done(bp2);
+ return(error);
+}
+
+
+/*========================================================================
+ * Routines used for growing the Btree.
+ *========================================================================*/
+
+/*
+ * Create the initial contents of a leaf attribute list
+ * or a leaf in a node attribute list.
+ */
+int
+xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_hdr_t *hdr;
+ xfs_inode_t *dp;
+ xfs_dabuf_t *bp;
+ int error;
+
+ dp = args->dp;
+ ASSERT(dp != NULL);
+ error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp,
+ XFS_ATTR_FORK);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+ leaf = bp->data;
+ memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount));
+ hdr = &leaf->hdr;
+ INT_SET(hdr->info.magic, ARCH_CONVERT, XFS_ATTR_LEAF_MAGIC);
+ INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount));
+ if (INT_ISZERO(hdr->firstused, ARCH_CONVERT)) {
+ INT_SET(hdr->firstused, ARCH_CONVERT,
+ XFS_LBSIZE(dp->i_mount) - XFS_ATTR_LEAF_NAME_ALIGN);
+ }
+
+ INT_SET(hdr->freemap[0].base, ARCH_CONVERT,
+ sizeof(xfs_attr_leaf_hdr_t));
+ INT_SET(hdr->freemap[0].size, ARCH_CONVERT,
+ INT_GET(hdr->firstused, ARCH_CONVERT)
+ - INT_GET(hdr->freemap[0].base,
+ ARCH_CONVERT));
+
+ xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1);
+
+ *bpp = bp;
+ return(0);
+}
+
+/*
+ * Split the leaf node, rebalance, then add the new entry.
+ */
+int
+xfs_attr_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
+ xfs_da_state_blk_t *newblk)
+{
+ xfs_dablk_t blkno;
+ int error;
+
+ /*
+ * Allocate space for a new leaf node.
+ */
+ ASSERT(oldblk->magic == XFS_ATTR_LEAF_MAGIC);
+ error = xfs_da_grow_inode(state->args, &blkno);
+ if (error)
+ return(error);
+ error = xfs_attr_leaf_create(state->args, blkno, &newblk->bp);
+ if (error)
+ return(error);
+ newblk->blkno = blkno;
+ newblk->magic = XFS_ATTR_LEAF_MAGIC;
+
+ /*
+ * Rebalance the entries across the two leaves.
+ * NOTE: rebalance() currently depends on the 2nd block being empty.
+ */
+ xfs_attr_leaf_rebalance(state, oldblk, newblk);
+ error = xfs_da_blk_link(state, oldblk, newblk);
+ if (error)
+ return(error);
+
+ /*
+ * Save info on "old" attribute for "atomic rename" ops, leaf_add()
+ * modifies the index/blkno/rmtblk/rmtblkcnt fields to show the
+ * "new" attrs info. Will need the "old" info to remove it later.
+ *
+ * Insert the "new" entry in the correct block.
+ */
+ if (state->inleaf)
+ error = xfs_attr_leaf_add(oldblk->bp, state->args);
+ else
+ error = xfs_attr_leaf_add(newblk->bp, state->args);
+
+ /*
+ * Update last hashval in each block since we added the name.
+ */
+ oldblk->hashval = xfs_attr_leaf_lasthash(oldblk->bp, NULL);
+ newblk->hashval = xfs_attr_leaf_lasthash(newblk->bp, NULL);
+ return(error);
+}
+
+/*
+ * Add a name to the leaf attribute list structure.
+ */
+int
+xfs_attr_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_hdr_t *hdr;
+ xfs_attr_leaf_map_t *map;
+ int tablesize, entsize, sum, tmp, i;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT((args->index >= 0)
+ && (args->index <= INT_GET(leaf->hdr.count, ARCH_CONVERT)));
+ hdr = &leaf->hdr;
+ entsize = xfs_attr_leaf_newentsize(args,
+ args->trans->t_mountp->m_sb.sb_blocksize, NULL);
+
+ /*
+ * Search through freemap for first-fit on new name length.
+ * (may need to figure in size of entry struct too)
+ */
+ tablesize = (INT_GET(hdr->count, ARCH_CONVERT) + 1)
+ * sizeof(xfs_attr_leaf_entry_t)
+ + sizeof(xfs_attr_leaf_hdr_t);
+ map = &hdr->freemap[XFS_ATTR_LEAF_MAPSIZE-1];
+ for (sum = 0, i = XFS_ATTR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {
+ if (tablesize > INT_GET(hdr->firstused, ARCH_CONVERT)) {
+ sum += INT_GET(map->size, ARCH_CONVERT);
+ continue;
+ }
+ if (INT_ISZERO(map->size, ARCH_CONVERT))
+ continue; /* no space in this map */
+ tmp = entsize;
+ if (INT_GET(map->base, ARCH_CONVERT)
+ < INT_GET(hdr->firstused, ARCH_CONVERT))
+ tmp += sizeof(xfs_attr_leaf_entry_t);
+ if (INT_GET(map->size, ARCH_CONVERT) >= tmp) {
+ tmp = xfs_attr_leaf_add_work(bp, args, i);
+ return(tmp);
+ }
+ sum += INT_GET(map->size, ARCH_CONVERT);
+ }
+
+ /*
+ * If there are no holes in the address space of the block,
+ * and we don't have enough freespace, then compaction will do us
+ * no good and we should just give up.
+ */
+ if (!hdr->holes && (sum < entsize))
+ return(XFS_ERROR(ENOSPC));
+
+ /*
+ * Compact the entries to coalesce free space.
+ * This may change the hdr->count via dropping INCOMPLETE entries.
+ */
+ xfs_attr_leaf_compact(args->trans, bp);
+
+ /*
+ * After compaction, the block is guaranteed to have only one
+ * free region, in freemap[0]. If it is not big enough, give up.
+ */
+ if (INT_GET(hdr->freemap[0].size, ARCH_CONVERT)
+ < (entsize + sizeof(xfs_attr_leaf_entry_t)))
+ return(XFS_ERROR(ENOSPC));
+
+ return(xfs_attr_leaf_add_work(bp, args, 0));
+}
+
+/*
+ * Add a name to a leaf attribute list structure.
+ */
+STATIC int
+xfs_attr_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int mapindex)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_hdr_t *hdr;
+ xfs_attr_leaf_entry_t *entry;
+ xfs_attr_leaf_name_local_t *name_loc;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+ xfs_attr_leaf_map_t *map;
+ xfs_mount_t *mp;
+ int tmp, i;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ hdr = &leaf->hdr;
+ ASSERT((mapindex >= 0) && (mapindex < XFS_ATTR_LEAF_MAPSIZE));
+ ASSERT((args->index >= 0)
+ && (args->index <= INT_GET(hdr->count, ARCH_CONVERT)));
+
+ /*
+ * Force open some space in the entry array and fill it in.
+ */
+ entry = &leaf->entries[args->index];
+ if (args->index < INT_GET(hdr->count, ARCH_CONVERT)) {
+ tmp = INT_GET(hdr->count, ARCH_CONVERT) - args->index;
+ tmp *= sizeof(xfs_attr_leaf_entry_t);
+ memmove((char *)(entry+1), (char *)entry, tmp);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
+ }
+ INT_MOD(hdr->count, ARCH_CONVERT, 1);
+
+ /*
+ * Allocate space for the new string (at the end of the run).
+ */
+ map = &hdr->freemap[mapindex];
+ mp = args->trans->t_mountp;
+ ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
+ ASSERT((INT_GET(map->base, ARCH_CONVERT) & 0x3) == 0);
+ ASSERT(INT_GET(map->size, ARCH_CONVERT)
+ >= xfs_attr_leaf_newentsize(args,
+ mp->m_sb.sb_blocksize, NULL));
+ ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
+ ASSERT((INT_GET(map->size, ARCH_CONVERT) & 0x3) == 0);
+ INT_MOD(map->size, ARCH_CONVERT,
+ -xfs_attr_leaf_newentsize(args, mp->m_sb.sb_blocksize, &tmp));
+ INT_SET(entry->nameidx, ARCH_CONVERT,
+ INT_GET(map->base, ARCH_CONVERT)
+ + INT_GET(map->size, ARCH_CONVERT));
+ INT_SET(entry->hashval, ARCH_CONVERT, args->hashval);
+ entry->flags = tmp ? XFS_ATTR_LOCAL : 0;
+ entry->flags |= (args->flags & ATTR_SECURE) ? XFS_ATTR_SECURE :
+ ((args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0);
+ if (args->rename) {
+ entry->flags |= XFS_ATTR_INCOMPLETE;
+ if ((args->blkno2 == args->blkno) &&
+ (args->index2 <= args->index)) {
+ args->index2++;
+ }
+ }
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
+ ASSERT((args->index == 0) || (INT_GET(entry->hashval, ARCH_CONVERT)
+ >= INT_GET((entry-1)->hashval,
+ ARCH_CONVERT)));
+ ASSERT((args->index == INT_GET(hdr->count, ARCH_CONVERT)-1) ||
+ (INT_GET(entry->hashval, ARCH_CONVERT)
+ <= (INT_GET((entry+1)->hashval, ARCH_CONVERT))));
+
+ /*
+ * Copy the attribute name and value into the new space.
+ *
+ * For "remote" attribute values, simply note that we need to
+ * allocate space for the "remote" value. We can't actually
+ * allocate the extents in this transaction, and we can't decide
+ * which blocks they should be as we might allocate more blocks
+ * as part of this transaction (a split operation for example).
+ */
+ if (entry->flags & XFS_ATTR_LOCAL) {
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
+ name_loc->namelen = args->namelen;
+ INT_SET(name_loc->valuelen, ARCH_CONVERT, args->valuelen);
+ memcpy((char *)name_loc->nameval, args->name, args->namelen);
+ memcpy((char *)&name_loc->nameval[args->namelen], args->value,
+ INT_GET(name_loc->valuelen, ARCH_CONVERT));
+ } else {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
+ name_rmt->namelen = args->namelen;
+ memcpy((char *)name_rmt->name, args->name, args->namelen);
+ entry->flags |= XFS_ATTR_INCOMPLETE;
+ /* just in case */
+ INT_ZERO(name_rmt->valuelen, ARCH_CONVERT);
+ INT_ZERO(name_rmt->valueblk, ARCH_CONVERT);
+ args->rmtblkno = 1;
+ args->rmtblkcnt = XFS_B_TO_FSB(mp, args->valuelen);
+ }
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
+ xfs_attr_leaf_entsize(leaf, args->index)));
+
+ /*
+ * Update the control info for this leaf node
+ */
+ if (INT_GET(entry->nameidx, ARCH_CONVERT)
+ < INT_GET(hdr->firstused, ARCH_CONVERT)) {
+ /* both on-disk, don't endian-flip twice */
+ hdr->firstused = entry->nameidx;
+ }
+ ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT)
+ >= ((INT_GET(hdr->count, ARCH_CONVERT)
+ * sizeof(*entry))+sizeof(*hdr)));
+ tmp = (INT_GET(hdr->count, ARCH_CONVERT)-1)
+ * sizeof(xfs_attr_leaf_entry_t)
+ + sizeof(xfs_attr_leaf_hdr_t);
+ map = &hdr->freemap[0];
+ for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
+ if (INT_GET(map->base, ARCH_CONVERT) == tmp) {
+ INT_MOD(map->base, ARCH_CONVERT,
+ sizeof(xfs_attr_leaf_entry_t));
+ INT_MOD(map->size, ARCH_CONVERT,
+ -sizeof(xfs_attr_leaf_entry_t));
+ }
+ }
+ INT_MOD(hdr->usedbytes, ARCH_CONVERT,
+ xfs_attr_leaf_entsize(leaf, args->index));
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
+ return(0);
+}
+
+/*
+ * Garbage collect a leaf attribute list block by copying it to a new buffer.
+ */
+STATIC void
+xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp)
+{
+ xfs_attr_leafblock_t *leaf_s, *leaf_d;
+ xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
+ xfs_mount_t *mp;
+ char *tmpbuffer;
+
+ mp = trans->t_mountp;
+ tmpbuffer = kmem_alloc(XFS_LBSIZE(mp), KM_SLEEP);
+ ASSERT(tmpbuffer != NULL);
+ memcpy(tmpbuffer, bp->data, XFS_LBSIZE(mp));
+ memset(bp->data, 0, XFS_LBSIZE(mp));
+
+ /*
+ * Copy basic information
+ */
+ leaf_s = (xfs_attr_leafblock_t *)tmpbuffer;
+ leaf_d = bp->data;
+ hdr_s = &leaf_s->hdr;
+ hdr_d = &leaf_d->hdr;
+ hdr_d->info = hdr_s->info; /* struct copy */
+ INT_SET(hdr_d->firstused, ARCH_CONVERT, XFS_LBSIZE(mp));
+ /* handle truncation gracefully */
+ if (INT_ISZERO(hdr_d->firstused, ARCH_CONVERT)) {
+ INT_SET(hdr_d->firstused, ARCH_CONVERT,
+ XFS_LBSIZE(mp) - XFS_ATTR_LEAF_NAME_ALIGN);
+ }
+ INT_ZERO(hdr_d->usedbytes, ARCH_CONVERT);
+ INT_ZERO(hdr_d->count, ARCH_CONVERT);
+ hdr_d->holes = 0;
+ INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT,
+ sizeof(xfs_attr_leaf_hdr_t));
+ INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT,
+ INT_GET(hdr_d->firstused, ARCH_CONVERT)
+ - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
+
+ /*
+ * Copy all entry's in the same (sorted) order,
+ * but allocate name/value pairs packed and in sequence.
+ */
+ xfs_attr_leaf_moveents(leaf_s, 0, leaf_d, 0,
+ (int)INT_GET(hdr_s->count, ARCH_CONVERT), mp);
+
+ xfs_da_log_buf(trans, bp, 0, XFS_LBSIZE(mp) - 1);
+
+ kmem_free(tmpbuffer, XFS_LBSIZE(mp));
+}
+
+/*
+ * Redistribute the attribute list entries between two leaf nodes,
+ * taking into account the size of the new entry.
+ *
+ * NOTE: if new block is empty, then it will get the upper half of the
+ * old block. At present, all (one) callers pass in an empty second block.
+ *
+ * This code adjusts the args->index/blkno and args->index2/blkno2 fields
+ * to match what it is doing in splitting the attribute leaf block. Those
+ * values are used in "atomic rename" operations on attributes. Note that
+ * the "new" and "old" values can end up in different blocks.
+ */
+STATIC void
+xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2)
+{
+ xfs_da_args_t *args;
+ xfs_da_state_blk_t *tmp_blk;
+ xfs_attr_leafblock_t *leaf1, *leaf2;
+ xfs_attr_leaf_hdr_t *hdr1, *hdr2;
+ int count, totallen, max, space, swap;
+
+ /*
+ * Set up environment.
+ */
+ ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC);
+ leaf1 = blk1->bp->data;
+ leaf2 = blk2->bp->data;
+ ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ args = state->args;
+
+ /*
+ * Check ordering of blocks, reverse if it makes things simpler.
+ *
+ * NOTE: Given that all (current) callers pass in an empty
+ * second block, this code should never set "swap".
+ */
+ swap = 0;
+ if (xfs_attr_leaf_order(blk1->bp, blk2->bp)) {
+ tmp_blk = blk1;
+ blk1 = blk2;
+ blk2 = tmp_blk;
+ leaf1 = blk1->bp->data;
+ leaf2 = blk2->bp->data;
+ swap = 1;
+ }
+ hdr1 = &leaf1->hdr;
+ hdr2 = &leaf2->hdr;
+
+ /*
+ * Examine entries until we reduce the absolute difference in
+ * byte usage between the two blocks to a minimum. Then get
+ * the direction to copy and the number of elements to move.
+ *
+ * "inleaf" is true if the new entry should be inserted into blk1.
+ * If "swap" is also true, then reverse the sense of "inleaf".
+ */
+ state->inleaf = xfs_attr_leaf_figure_balance(state, blk1, blk2,
+ &count, &totallen);
+ if (swap)
+ state->inleaf = !state->inleaf;
+
+ /*
+ * Move any entries required from leaf to leaf:
+ */
+ if (count < INT_GET(hdr1->count, ARCH_CONVERT)) {
+ /*
+ * Figure the total bytes to be added to the destination leaf.
+ */
+ /* number entries being moved */
+ count = INT_GET(hdr1->count, ARCH_CONVERT) - count;
+ space = INT_GET(hdr1->usedbytes, ARCH_CONVERT) - totallen;
+ space += count * sizeof(xfs_attr_leaf_entry_t);
+
+ /*
+ * leaf2 is the destination, compact it if it looks tight.
+ */
+ max = INT_GET(hdr2->firstused, ARCH_CONVERT)
+ - sizeof(xfs_attr_leaf_hdr_t);
+ max -= INT_GET(hdr2->count, ARCH_CONVERT)
+ * sizeof(xfs_attr_leaf_entry_t);
+ if (space > max) {
+ xfs_attr_leaf_compact(args->trans, blk2->bp);
+ }
+
+ /*
+ * Move high entries from leaf1 to low end of leaf2.
+ */
+ xfs_attr_leaf_moveents(leaf1,
+ INT_GET(hdr1->count, ARCH_CONVERT)-count,
+ leaf2, 0, count, state->mp);
+
+ xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
+ xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);
+ } else if (count > INT_GET(hdr1->count, ARCH_CONVERT)) {
+ /*
+ * I assert that since all callers pass in an empty
+ * second buffer, this code should never execute.
+ */
+
+ /*
+ * Figure the total bytes to be added to the destination leaf.
+ */
+ /* number entries being moved */
+ count -= INT_GET(hdr1->count, ARCH_CONVERT);
+ space = totallen - INT_GET(hdr1->usedbytes, ARCH_CONVERT);
+ space += count * sizeof(xfs_attr_leaf_entry_t);
+
+ /*
+ * leaf1 is the destination, compact it if it looks tight.
+ */
+ max = INT_GET(hdr1->firstused, ARCH_CONVERT)
+ - sizeof(xfs_attr_leaf_hdr_t);
+ max -= INT_GET(hdr1->count, ARCH_CONVERT)
+ * sizeof(xfs_attr_leaf_entry_t);
+ if (space > max) {
+ xfs_attr_leaf_compact(args->trans, blk1->bp);
+ }
+
+ /*
+ * Move low entries from leaf2 to high end of leaf1.
+ */
+ xfs_attr_leaf_moveents(leaf2, 0, leaf1,
+ (int)INT_GET(hdr1->count, ARCH_CONVERT), count,
+ state->mp);
+
+ xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
+ xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);
+ }
+
+ /*
+ * Copy out last hashval in each block for B-tree code.
+ */
+ blk1->hashval =
+ INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count,
+ ARCH_CONVERT)-1].hashval, ARCH_CONVERT);
+ blk2->hashval =
+ INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count,
+ ARCH_CONVERT)-1].hashval, ARCH_CONVERT);
+
+ /*
+ * Adjust the expected index for insertion.
+ * NOTE: this code depends on the (current) situation that the
+ * second block was originally empty.
+ *
+ * If the insertion point moved to the 2nd block, we must adjust
+ * the index. We must also track the entry just following the
+ * new entry for use in an "atomic rename" operation, that entry
+ * is always the "old" entry and the "new" entry is what we are
+ * inserting. The index/blkno fields refer to the "old" entry,
+ * while the index2/blkno2 fields refer to the "new" entry.
+ */
+ if (blk1->index > INT_GET(leaf1->hdr.count, ARCH_CONVERT)) {
+ ASSERT(state->inleaf == 0);
+ blk2->index = blk1->index
+ - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
+ args->index = args->index2 = blk2->index;
+ args->blkno = args->blkno2 = blk2->blkno;
+ } else if (blk1->index == INT_GET(leaf1->hdr.count, ARCH_CONVERT)) {
+ if (state->inleaf) {
+ args->index = blk1->index;
+ args->blkno = blk1->blkno;
+ args->index2 = 0;
+ args->blkno2 = blk2->blkno;
+ } else {
+ blk2->index = blk1->index
+ - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
+ args->index = args->index2 = blk2->index;
+ args->blkno = args->blkno2 = blk2->blkno;
+ }
+ } else {
+ ASSERT(state->inleaf == 1);
+ args->index = args->index2 = blk1->index;
+ args->blkno = args->blkno2 = blk1->blkno;
+ }
+}
+
+/*
+ * Examine entries until we reduce the absolute difference in
+ * byte usage between the two blocks to a minimum.
+ * GROT: Is this really necessary? With other than a 512 byte blocksize,
+ * GROT: there will always be enough room in either block for a new entry.
+ * GROT: Do a double-split for this case?
+ */
+STATIC int
+xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2,
+ int *countarg, int *usedbytesarg)
+{
+ xfs_attr_leafblock_t *leaf1, *leaf2;
+ xfs_attr_leaf_hdr_t *hdr1, *hdr2;
+ xfs_attr_leaf_entry_t *entry;
+ int count, max, index, totallen, half;
+ int lastdelta, foundit, tmp;
+
+ /*
+ * Set up environment.
+ */
+ leaf1 = blk1->bp->data;
+ leaf2 = blk2->bp->data;
+ hdr1 = &leaf1->hdr;
+ hdr2 = &leaf2->hdr;
+ foundit = 0;
+ totallen = 0;
+
+ /*
+ * Examine entries until we reduce the absolute difference in
+ * byte usage between the two blocks to a minimum.
+ */
+ max = INT_GET(hdr1->count, ARCH_CONVERT)
+ + INT_GET(hdr2->count, ARCH_CONVERT);
+ half = (max+1) * sizeof(*entry);
+ half += INT_GET(hdr1->usedbytes, ARCH_CONVERT)
+ + INT_GET(hdr2->usedbytes, ARCH_CONVERT)
+ + xfs_attr_leaf_newentsize(state->args,
+ state->blocksize, NULL);
+ half /= 2;
+ lastdelta = state->blocksize;
+ entry = &leaf1->entries[0];
+ for (count = index = 0; count < max; entry++, index++, count++) {
+
+#define XFS_ATTR_ABS(A) (((A) < 0) ? -(A) : (A))
+ /*
+ * The new entry is in the first block, account for it.
+ */
+ if (count == blk1->index) {
+ tmp = totallen + sizeof(*entry) +
+ xfs_attr_leaf_newentsize(state->args,
+ state->blocksize,
+ NULL);
+ if (XFS_ATTR_ABS(half - tmp) > lastdelta)
+ break;
+ lastdelta = XFS_ATTR_ABS(half - tmp);
+ totallen = tmp;
+ foundit = 1;
+ }
+
+ /*
+ * Wrap around into the second block if necessary.
+ */
+ if (count == INT_GET(hdr1->count, ARCH_CONVERT)) {
+ leaf1 = leaf2;
+ entry = &leaf1->entries[0];
+ index = 0;
+ }
+
+ /*
+ * Figure out if next leaf entry would be too much.
+ */
+ tmp = totallen + sizeof(*entry) + xfs_attr_leaf_entsize(leaf1,
+ index);
+ if (XFS_ATTR_ABS(half - tmp) > lastdelta)
+ break;
+ lastdelta = XFS_ATTR_ABS(half - tmp);
+ totallen = tmp;
+#undef XFS_ATTR_ABS
+ }
+
+ /*
+ * Calculate the number of usedbytes that will end up in lower block.
+ * If new entry not in lower block, fix up the count.
+ */
+ totallen -= count * sizeof(*entry);
+ if (foundit) {
+ totallen -= sizeof(*entry) +
+ xfs_attr_leaf_newentsize(state->args,
+ state->blocksize,
+ NULL);
+ }
+
+ *countarg = count;
+ *usedbytesarg = totallen;
+ return(foundit);
+}
+
+/*========================================================================
+ * Routines used for shrinking the Btree.
+ *========================================================================*/
+
+/*
+ * Check a leaf block and its neighbors to see if the block should be
+ * collapsed into one or the other neighbor. Always keep the block
+ * with the smaller block number.
+ * If the current block is over 50% full, don't try to join it, return 0.
+ * If the block is empty, fill in the state structure and return 2.
+ * If it can be collapsed, fill in the state structure and return 1.
+ * If nothing can be done, return 0.
+ *
+ * GROT: allow for INCOMPLETE entries in calculation.
+ */
+int
+xfs_attr_leaf_toosmall(xfs_da_state_t *state, int *action)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_da_state_blk_t *blk;
+ xfs_da_blkinfo_t *info;
+ int count, bytes, forward, error, retval, i;
+ xfs_dablk_t blkno;
+ xfs_dabuf_t *bp;
+
+ /*
+ * Check for the degenerate case of the block being over 50% full.
+ * If so, it's not worth even looking to see if we might be able
+ * to coalesce with a sibling.
+ */
+ blk = &state->path.blk[ state->path.active-1 ];
+ info = blk->bp->data;
+ ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC);
+ leaf = (xfs_attr_leafblock_t *)info;
+ count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ bytes = sizeof(xfs_attr_leaf_hdr_t) +
+ count * sizeof(xfs_attr_leaf_entry_t) +
+ INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
+ if (bytes > (state->blocksize >> 1)) {
+ *action = 0; /* blk over 50%, don't try to join */
+ return(0);
+ }
+
+ /*
+ * Check for the degenerate case of the block being empty.
+ * If the block is empty, we'll simply delete it, no need to
+ * coalesce it with a sibling block. We choose (aribtrarily)
+ * to merge with the forward block unless it is NULL.
+ */
+ if (count == 0) {
+ /*
+ * Make altpath point to the block we want to keep and
+ * path point to the block we want to drop (this one).
+ */
+ forward = (!INT_ISZERO(info->forw, ARCH_CONVERT));
+ memcpy(&state->altpath, &state->path, sizeof(state->path));
+ error = xfs_da_path_shift(state, &state->altpath, forward,
+ 0, &retval);
+ if (error)
+ return(error);
+ if (retval) {
+ *action = 0;
+ } else {
+ *action = 2;
+ }
+ return(0);
+ }
+
+ /*
+ * Examine each sibling block to see if we can coalesce with
+ * at least 25% free space to spare. We need to figure out
+ * whether to merge with the forward or the backward block.
+ * We prefer coalescing with the lower numbered sibling so as
+ * to shrink an attribute list over time.
+ */
+ /* start with smaller blk num */
+ forward = (INT_GET(info->forw, ARCH_CONVERT)
+ < INT_GET(info->back, ARCH_CONVERT));
+ for (i = 0; i < 2; forward = !forward, i++) {
+ if (forward)
+ blkno = INT_GET(info->forw, ARCH_CONVERT);
+ else
+ blkno = INT_GET(info->back, ARCH_CONVERT);
+ if (blkno == 0)
+ continue;
+ error = xfs_da_read_buf(state->args->trans, state->args->dp,
+ blkno, -1, &bp, XFS_ATTR_FORK);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+
+ leaf = (xfs_attr_leafblock_t *)info;
+ count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ bytes = state->blocksize - (state->blocksize>>2);
+ bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ count += INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ bytes -= INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
+ bytes -= count * sizeof(xfs_attr_leaf_entry_t);
+ bytes -= sizeof(xfs_attr_leaf_hdr_t);
+ xfs_da_brelse(state->args->trans, bp);
+ if (bytes >= 0)
+ break; /* fits with at least 25% to spare */
+ }
+ if (i >= 2) {
+ *action = 0;
+ return(0);
+ }
+
+ /*
+ * Make altpath point to the block we want to keep (the lower
+ * numbered block) and path point to the block we want to drop.
+ */
+ memcpy(&state->altpath, &state->path, sizeof(state->path));
+ if (blkno < blk->blkno) {
+ error = xfs_da_path_shift(state, &state->altpath, forward,
+ 0, &retval);
+ } else {
+ error = xfs_da_path_shift(state, &state->path, forward,
+ 0, &retval);
+ }
+ if (error)
+ return(error);
+ if (retval) {
+ *action = 0;
+ } else {
+ *action = 1;
+ }
+ return(0);
+}
+
+/*
+ * Remove a name from the leaf attribute list structure.
+ *
+ * Return 1 if leaf is less than 37% full, 0 if >= 37% full.
+ * If two leaves are 37% full, when combined they will leave 25% free.
+ */
+int
+xfs_attr_leaf_remove(xfs_dabuf_t *bp, xfs_da_args_t *args)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_hdr_t *hdr;
+ xfs_attr_leaf_map_t *map;
+ xfs_attr_leaf_entry_t *entry;
+ int before, after, smallest, entsize;
+ int tablesize, tmp, i;
+ xfs_mount_t *mp;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ hdr = &leaf->hdr;
+ mp = args->trans->t_mountp;
+ ASSERT((INT_GET(hdr->count, ARCH_CONVERT) > 0)
+ && (INT_GET(hdr->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)));
+ ASSERT((args->index >= 0)
+ && (args->index < INT_GET(hdr->count, ARCH_CONVERT)));
+ ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT)
+ >= ((INT_GET(hdr->count, ARCH_CONVERT)
+ * sizeof(*entry))+sizeof(*hdr)));
+ entry = &leaf->entries[args->index];
+ ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT)
+ >= INT_GET(hdr->firstused, ARCH_CONVERT));
+ ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp));
+
+ /*
+ * Scan through free region table:
+ * check for adjacency of free'd entry with an existing one,
+ * find smallest free region in case we need to replace it,
+ * adjust any map that borders the entry table,
+ */
+ tablesize = INT_GET(hdr->count, ARCH_CONVERT)
+ * sizeof(xfs_attr_leaf_entry_t)
+ + sizeof(xfs_attr_leaf_hdr_t);
+ map = &hdr->freemap[0];
+ tmp = INT_GET(map->size, ARCH_CONVERT);
+ before = after = -1;
+ smallest = XFS_ATTR_LEAF_MAPSIZE - 1;
+ entsize = xfs_attr_leaf_entsize(leaf, args->index);
+ for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
+ ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
+ ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
+ if (INT_GET(map->base, ARCH_CONVERT) == tablesize) {
+ INT_MOD(map->base, ARCH_CONVERT,
+ -sizeof(xfs_attr_leaf_entry_t));
+ INT_MOD(map->size, ARCH_CONVERT,
+ sizeof(xfs_attr_leaf_entry_t));
+ }
+
+ if ((INT_GET(map->base, ARCH_CONVERT)
+ + INT_GET(map->size, ARCH_CONVERT))
+ == INT_GET(entry->nameidx, ARCH_CONVERT)) {
+ before = i;
+ } else if (INT_GET(map->base, ARCH_CONVERT)
+ == (INT_GET(entry->nameidx, ARCH_CONVERT) + entsize)) {
+ after = i;
+ } else if (INT_GET(map->size, ARCH_CONVERT) < tmp) {
+ tmp = INT_GET(map->size, ARCH_CONVERT);
+ smallest = i;
+ }
+ }
+
+ /*
+ * Coalesce adjacent freemap regions,
+ * or replace the smallest region.
+ */
+ if ((before >= 0) || (after >= 0)) {
+ if ((before >= 0) && (after >= 0)) {
+ map = &hdr->freemap[before];
+ INT_MOD(map->size, ARCH_CONVERT, entsize);
+ INT_MOD(map->size, ARCH_CONVERT,
+ INT_GET(hdr->freemap[after].size,
+ ARCH_CONVERT));
+ INT_ZERO(hdr->freemap[after].base, ARCH_CONVERT);
+ INT_ZERO(hdr->freemap[after].size, ARCH_CONVERT);
+ } else if (before >= 0) {
+ map = &hdr->freemap[before];
+ INT_MOD(map->size, ARCH_CONVERT, entsize);
+ } else {
+ map = &hdr->freemap[after];
+ /* both on-disk, don't endian flip twice */
+ map->base = entry->nameidx;
+ INT_MOD(map->size, ARCH_CONVERT, entsize);
+ }
+ } else {
+ /*
+ * Replace smallest region (if it is smaller than free'd entry)
+ */
+ map = &hdr->freemap[smallest];
+ if (INT_GET(map->size, ARCH_CONVERT) < entsize) {
+ INT_SET(map->base, ARCH_CONVERT,
+ INT_GET(entry->nameidx, ARCH_CONVERT));
+ INT_SET(map->size, ARCH_CONVERT, entsize);
+ }
+ }
+
+ /*
+ * Did we remove the first entry?
+ */
+ if (INT_GET(entry->nameidx, ARCH_CONVERT)
+ == INT_GET(hdr->firstused, ARCH_CONVERT))
+ smallest = 1;
+ else
+ smallest = 0;
+
+ /*
+ * Compress the remaining entries and zero out the removed stuff.
+ */
+ memset(XFS_ATTR_LEAF_NAME(leaf, args->index), 0, entsize);
+ INT_MOD(hdr->usedbytes, ARCH_CONVERT, -entsize);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
+ entsize));
+
+ tmp = (INT_GET(hdr->count, ARCH_CONVERT) - args->index)
+ * sizeof(xfs_attr_leaf_entry_t);
+ memmove((char *)entry, (char *)(entry+1), tmp);
+ INT_MOD(hdr->count, ARCH_CONVERT, -1);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
+ entry = &leaf->entries[INT_GET(hdr->count, ARCH_CONVERT)];
+ memset((char *)entry, 0, sizeof(xfs_attr_leaf_entry_t));
+
+ /*
+ * If we removed the first entry, re-find the first used byte
+ * in the name area. Note that if the entry was the "firstused",
+ * then we don't have a "hole" in our block resulting from
+ * removing the name.
+ */
+ if (smallest) {
+ tmp = XFS_LBSIZE(mp);
+ entry = &leaf->entries[0];
+ for (i = INT_GET(hdr->count, ARCH_CONVERT)-1;
+ i >= 0; entry++, i--) {
+ ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT)
+ >= INT_GET(hdr->firstused, ARCH_CONVERT));
+ ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT)
+ < XFS_LBSIZE(mp));
+ if (INT_GET(entry->nameidx, ARCH_CONVERT) < tmp)
+ tmp = INT_GET(entry->nameidx, ARCH_CONVERT);
+ }
+ INT_SET(hdr->firstused, ARCH_CONVERT, tmp);
+ if (INT_ISZERO(hdr->firstused, ARCH_CONVERT)) {
+ INT_SET(hdr->firstused, ARCH_CONVERT,
+ tmp - XFS_ATTR_LEAF_NAME_ALIGN);
+ }
+ } else {
+ hdr->holes = 1; /* mark as needing compaction */
+ }
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
+
+ /*
+ * Check if leaf is less than 50% full, caller may want to
+ * "join" the leaf with a sibling if so.
+ */
+ tmp = sizeof(xfs_attr_leaf_hdr_t);
+ tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT)
+ * sizeof(xfs_attr_leaf_entry_t);
+ tmp += INT_GET(leaf->hdr.usedbytes, ARCH_CONVERT);
+ return(tmp < mp->m_attr_magicpct); /* leaf is < 37% full */
+}
+
+/*
+ * Move all the attribute list entries from drop_leaf into save_leaf.
+ */
+void
+xfs_attr_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
+ xfs_da_state_blk_t *save_blk)
+{
+ xfs_attr_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf;
+ xfs_attr_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr;
+ xfs_mount_t *mp;
+ char *tmpbuffer;
+
+ /*
+ * Set up environment.
+ */
+ mp = state->mp;
+ ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(save_blk->magic == XFS_ATTR_LEAF_MAGIC);
+ drop_leaf = drop_blk->bp->data;
+ save_leaf = save_blk->bp->data;
+ ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ drop_hdr = &drop_leaf->hdr;
+ save_hdr = &save_leaf->hdr;
+
+ /*
+ * Save last hashval from dying block for later Btree fixup.
+ */
+ drop_blk->hashval =
+ INT_GET(drop_leaf->entries[INT_GET(drop_leaf->hdr.count,
+ ARCH_CONVERT)-1].hashval,
+ ARCH_CONVERT);
+
+ /*
+ * Check if we need a temp buffer, or can we do it in place.
+ * Note that we don't check "leaf" for holes because we will
+ * always be dropping it, toosmall() decided that for us already.
+ */
+ if (save_hdr->holes == 0) {
+ /*
+ * dest leaf has no holes, so we add there. May need
+ * to make some room in the entry array.
+ */
+ if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
+ xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, 0,
+ (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
+ } else {
+ xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf,
+ INT_GET(save_hdr->count, ARCH_CONVERT),
+ (int)INT_GET(drop_hdr->count, ARCH_CONVERT),
+ mp);
+ }
+ } else {
+ /*
+ * Destination has holes, so we make a temporary copy
+ * of the leaf and add them both to that.
+ */
+ tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP);
+ ASSERT(tmpbuffer != NULL);
+ memset(tmpbuffer, 0, state->blocksize);
+ tmp_leaf = (xfs_attr_leafblock_t *)tmpbuffer;
+ tmp_hdr = &tmp_leaf->hdr;
+ tmp_hdr->info = save_hdr->info; /* struct copy */
+ INT_ZERO(tmp_hdr->count, ARCH_CONVERT);
+ INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize);
+ if (INT_ISZERO(tmp_hdr->firstused, ARCH_CONVERT)) {
+ INT_SET(tmp_hdr->firstused, ARCH_CONVERT,
+ state->blocksize - XFS_ATTR_LEAF_NAME_ALIGN);
+ }
+ INT_ZERO(tmp_hdr->usedbytes, ARCH_CONVERT);
+ if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
+ xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, 0,
+ (int)INT_GET(drop_hdr->count, ARCH_CONVERT),
+ mp);
+ xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf,
+ INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
+ (int)INT_GET(save_hdr->count, ARCH_CONVERT),
+ mp);
+ } else {
+ xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, 0,
+ (int)INT_GET(save_hdr->count, ARCH_CONVERT),
+ mp);
+ xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf,
+ INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
+ (int)INT_GET(drop_hdr->count, ARCH_CONVERT),
+ mp);
+ }
+ memcpy((char *)save_leaf, (char *)tmp_leaf, state->blocksize);
+ kmem_free(tmpbuffer, state->blocksize);
+ }
+
+ xfs_da_log_buf(state->args->trans, save_blk->bp, 0,
+ state->blocksize - 1);
+
+ /*
+ * Copy out last hashval in each block for B-tree code.
+ */
+ save_blk->hashval =
+ INT_GET(save_leaf->entries[INT_GET(save_leaf->hdr.count,
+ ARCH_CONVERT)-1].hashval,
+ ARCH_CONVERT);
+}
+
+/*========================================================================
+ * Routines used for finding things in the Btree.
+ *========================================================================*/
+
+/*
+ * Look up a name in a leaf attribute list structure.
+ * This is the internal routine, it uses the caller's buffer.
+ *
+ * Note that duplicate keys are allowed, but only check within the
+ * current leaf node. The Btree code must check in adjacent leaf nodes.
+ *
+ * Return in args->index the index into the entry[] array of either
+ * the found entry, or where the entry should have been (insert before
+ * that entry).
+ *
+ * Don't change the args->value unless we find the attribute.
+ */
+int
+xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_entry_t *entry;
+ xfs_attr_leaf_name_local_t *name_loc;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+ int probe, span;
+ xfs_dahash_t hashval;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT)
+ < (XFS_LBSIZE(args->dp->i_mount)/8));
+
+ /*
+ * Binary search. (note: small blocks will skip this loop)
+ */
+ hashval = args->hashval;
+ probe = span = INT_GET(leaf->hdr.count, ARCH_CONVERT) / 2;
+ for (entry = &leaf->entries[probe]; span > 4;
+ entry = &leaf->entries[probe]) {
+ span /= 2;
+ if (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)
+ probe += span;
+ else if (INT_GET(entry->hashval, ARCH_CONVERT) > hashval)
+ probe -= span;
+ else
+ break;
+ }
+ ASSERT((probe >= 0) && \
+ ((INT_ISZERO(leaf->hdr.count, ARCH_CONVERT))
+ || (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))));
+ ASSERT((span <= 4) || (INT_GET(entry->hashval, ARCH_CONVERT)
+ == hashval));
+
+ /*
+ * Since we may have duplicate hashval's, find the first matching
+ * hashval in the leaf.
+ */
+ while ((probe > 0) && (INT_GET(entry->hashval, ARCH_CONVERT)
+ >= hashval)) {
+ entry--;
+ probe--;
+ }
+ while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))
+ && (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)) {
+ entry++;
+ probe++;
+ }
+ if ((probe == INT_GET(leaf->hdr.count, ARCH_CONVERT))
+ || (INT_GET(entry->hashval, ARCH_CONVERT) != hashval)) {
+ args->index = probe;
+ return(XFS_ERROR(ENOATTR));
+ }
+
+ /*
+ * Duplicate keys may be present, so search all of them for a match.
+ */
+ for ( ; (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))
+ && (INT_GET(entry->hashval, ARCH_CONVERT) == hashval);
+ entry++, probe++) {
+/*
+ * GROT: Add code to remove incomplete entries.
+ */
+ /*
+ * If we are looking for INCOMPLETE entries, show only those.
+ * If we are looking for complete entries, show only those.
+ */
+ if ((args->flags & XFS_ATTR_INCOMPLETE) !=
+ (entry->flags & XFS_ATTR_INCOMPLETE)) {
+ continue;
+ }
+ if (entry->flags & XFS_ATTR_LOCAL) {
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, probe);
+ if (name_loc->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, (char *)name_loc->nameval,
+ args->namelen) != 0)
+ continue;
+ if (((args->flags & ATTR_SECURE) != 0) !=
+ ((entry->flags & XFS_ATTR_SECURE) != 0))
+ continue;
+ if (((args->flags & ATTR_ROOT) != 0) !=
+ ((entry->flags & XFS_ATTR_ROOT) != 0))
+ continue;
+ args->index = probe;
+ return(XFS_ERROR(EEXIST));
+ } else {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, probe);
+ if (name_rmt->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, (char *)name_rmt->name,
+ args->namelen) != 0)
+ continue;
+ if (((args->flags & ATTR_SECURE) != 0) !=
+ ((entry->flags & XFS_ATTR_SECURE) != 0))
+ continue;
+ if (((args->flags & ATTR_ROOT) != 0) !=
+ ((entry->flags & XFS_ATTR_ROOT) != 0))
+ continue;
+ args->index = probe;
+ args->rmtblkno
+ = INT_GET(name_rmt->valueblk, ARCH_CONVERT);
+ args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount,
+ INT_GET(name_rmt->valuelen,
+ ARCH_CONVERT));
+ return(XFS_ERROR(EEXIST));
+ }
+ }
+ args->index = probe;
+ return(XFS_ERROR(ENOATTR));
+}
+
+/*
+ * Get the value associated with an attribute name from a leaf attribute
+ * list structure.
+ */
+int
+xfs_attr_leaf_getvalue(xfs_dabuf_t *bp, xfs_da_args_t *args)
+{
+ int valuelen;
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_entry_t *entry;
+ xfs_attr_leaf_name_local_t *name_loc;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT)
+ < (XFS_LBSIZE(args->dp->i_mount)/8));
+ ASSERT(args->index < ((int)INT_GET(leaf->hdr.count, ARCH_CONVERT)));
+
+ entry = &leaf->entries[args->index];
+ if (entry->flags & XFS_ATTR_LOCAL) {
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
+ ASSERT(name_loc->namelen == args->namelen);
+ ASSERT(memcmp(args->name, name_loc->nameval, args->namelen) == 0);
+ valuelen = INT_GET(name_loc->valuelen, ARCH_CONVERT);
+ if (args->flags & ATTR_KERNOVAL) {
+ args->valuelen = valuelen;
+ return(0);
+ }
+ if (args->valuelen < valuelen) {
+ args->valuelen = valuelen;
+ return(XFS_ERROR(ERANGE));
+ }
+ args->valuelen = valuelen;
+ memcpy(args->value, &name_loc->nameval[args->namelen], valuelen);
+ } else {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
+ ASSERT(name_rmt->namelen == args->namelen);
+ ASSERT(memcmp(args->name, name_rmt->name, args->namelen) == 0);
+ valuelen = INT_GET(name_rmt->valuelen, ARCH_CONVERT);
+ args->rmtblkno = INT_GET(name_rmt->valueblk, ARCH_CONVERT);
+ args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount, valuelen);
+ if (args->flags & ATTR_KERNOVAL) {
+ args->valuelen = valuelen;
+ return(0);
+ }
+ if (args->valuelen < valuelen) {
+ args->valuelen = valuelen;
+ return(XFS_ERROR(ERANGE));
+ }
+ args->valuelen = valuelen;
+ }
+ return(0);
+}
+
+/*========================================================================
+ * Utility routines.
+ *========================================================================*/
+
+/*
+ * Move the indicated entries from one leaf to another.
+ * NOTE: this routine modifies both source and destination leaves.
+ */
+/*ARGSUSED*/
+STATIC void
+xfs_attr_leaf_moveents(xfs_attr_leafblock_t *leaf_s, int start_s,
+ xfs_attr_leafblock_t *leaf_d, int start_d,
+ int count, xfs_mount_t *mp)
+{
+ xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
+ xfs_attr_leaf_entry_t *entry_s, *entry_d;
+ int desti, tmp, i;
+
+ /*
+ * Check for nothing to do.
+ */
+ if (count == 0)
+ return;
+
+ /*
+ * Set up environment.
+ */
+ ASSERT(INT_GET(leaf_s->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(INT_GET(leaf_d->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ hdr_s = &leaf_s->hdr;
+ hdr_d = &leaf_d->hdr;
+ ASSERT((INT_GET(hdr_s->count, ARCH_CONVERT) > 0)
+ && (INT_GET(hdr_s->count, ARCH_CONVERT)
+ < (XFS_LBSIZE(mp)/8)));
+ ASSERT(INT_GET(hdr_s->firstused, ARCH_CONVERT) >=
+ ((INT_GET(hdr_s->count, ARCH_CONVERT)
+ * sizeof(*entry_s))+sizeof(*hdr_s)));
+ ASSERT(INT_GET(hdr_d->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8));
+ ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >=
+ ((INT_GET(hdr_d->count, ARCH_CONVERT)
+ * sizeof(*entry_d))+sizeof(*hdr_d)));
+
+ ASSERT(start_s < INT_GET(hdr_s->count, ARCH_CONVERT));
+ ASSERT(start_d <= INT_GET(hdr_d->count, ARCH_CONVERT));
+ ASSERT(count <= INT_GET(hdr_s->count, ARCH_CONVERT));
+
+ /*
+ * Move the entries in the destination leaf up to make a hole?
+ */
+ if (start_d < INT_GET(hdr_d->count, ARCH_CONVERT)) {
+ tmp = INT_GET(hdr_d->count, ARCH_CONVERT) - start_d;
+ tmp *= sizeof(xfs_attr_leaf_entry_t);
+ entry_s = &leaf_d->entries[start_d];
+ entry_d = &leaf_d->entries[start_d + count];
+ memmove((char *)entry_d, (char *)entry_s, tmp);
+ }
+
+ /*
+ * Copy all entry's in the same (sorted) order,
+ * but allocate attribute info packed and in sequence.
+ */
+ entry_s = &leaf_s->entries[start_s];
+ entry_d = &leaf_d->entries[start_d];
+ desti = start_d;
+ for (i = 0; i < count; entry_s++, entry_d++, desti++, i++) {
+ ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT)
+ >= INT_GET(hdr_s->firstused, ARCH_CONVERT));
+ tmp = xfs_attr_leaf_entsize(leaf_s, start_s + i);
+#ifdef GROT
+ /*
+ * Code to drop INCOMPLETE entries. Difficult to use as we
+ * may also need to change the insertion index. Code turned
+ * off for 6.2, should be revisited later.
+ */
+ if (entry_s->flags & XFS_ATTR_INCOMPLETE) { /* skip partials? */
+ memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);
+ INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp);
+ INT_MOD(hdr_s->count, ARCH_CONVERT, -1);
+ entry_d--; /* to compensate for ++ in loop hdr */
+ desti--;
+ if ((start_s + i) < offset)
+ result++; /* insertion index adjustment */
+ } else {
+#endif /* GROT */
+ INT_MOD(hdr_d->firstused, ARCH_CONVERT, -tmp);
+ /* both on-disk, don't endian flip twice */
+ entry_d->hashval = entry_s->hashval;
+ /* both on-disk, don't endian flip twice */
+ entry_d->nameidx = hdr_d->firstused;
+ entry_d->flags = entry_s->flags;
+ ASSERT(INT_GET(entry_d->nameidx, ARCH_CONVERT) + tmp
+ <= XFS_LBSIZE(mp));
+ memmove(XFS_ATTR_LEAF_NAME(leaf_d, desti),
+ XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), tmp);
+ ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) + tmp
+ <= XFS_LBSIZE(mp));
+ memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);
+ INT_MOD(hdr_s->usedbytes, ARCH_CONVERT, -tmp);
+ INT_MOD(hdr_d->usedbytes, ARCH_CONVERT, tmp);
+ INT_MOD(hdr_s->count, ARCH_CONVERT, -1);
+ INT_MOD(hdr_d->count, ARCH_CONVERT, 1);
+ tmp = INT_GET(hdr_d->count, ARCH_CONVERT)
+ * sizeof(xfs_attr_leaf_entry_t)
+ + sizeof(xfs_attr_leaf_hdr_t);
+ ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= tmp);
+#ifdef GROT
+ }
+#endif /* GROT */
+ }
+
+ /*
+ * Zero out the entries we just copied.
+ */
+ if (start_s == INT_GET(hdr_s->count, ARCH_CONVERT)) {
+ tmp = count * sizeof(xfs_attr_leaf_entry_t);
+ entry_s = &leaf_s->entries[start_s];
+ ASSERT(((char *)entry_s + tmp) <=
+ ((char *)leaf_s + XFS_LBSIZE(mp)));
+ memset((char *)entry_s, 0, tmp);
+ } else {
+ /*
+ * Move the remaining entries down to fill the hole,
+ * then zero the entries at the top.
+ */
+ tmp = INT_GET(hdr_s->count, ARCH_CONVERT) - count;
+ tmp *= sizeof(xfs_attr_leaf_entry_t);
+ entry_s = &leaf_s->entries[start_s + count];
+ entry_d = &leaf_s->entries[start_s];
+ memmove((char *)entry_d, (char *)entry_s, tmp);
+
+ tmp = count * sizeof(xfs_attr_leaf_entry_t);
+ entry_s = &leaf_s->entries[INT_GET(hdr_s->count,
+ ARCH_CONVERT)];
+ ASSERT(((char *)entry_s + tmp) <=
+ ((char *)leaf_s + XFS_LBSIZE(mp)));
+ memset((char *)entry_s, 0, tmp);
+ }
+
+ /*
+ * Fill in the freemap information
+ */
+ INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT,
+ sizeof(xfs_attr_leaf_hdr_t));
+ INT_MOD(hdr_d->freemap[0].base, ARCH_CONVERT,
+ INT_GET(hdr_d->count, ARCH_CONVERT)
+ * sizeof(xfs_attr_leaf_entry_t));
+ INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT,
+ INT_GET(hdr_d->firstused, ARCH_CONVERT)
+ - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
+ INT_ZERO(hdr_d->freemap[1].base, ARCH_CONVERT);
+ INT_ZERO(hdr_d->freemap[2].base, ARCH_CONVERT);
+ INT_ZERO(hdr_d->freemap[1].size, ARCH_CONVERT);
+ INT_ZERO(hdr_d->freemap[2].size, ARCH_CONVERT);
+ hdr_s->holes = 1; /* leaf may not be compact */
+}
+
+/*
+ * Compare two leaf blocks "order".
+ * Return 0 unless leaf2 should go before leaf1.
+ */
+int
+xfs_attr_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp)
+{
+ xfs_attr_leafblock_t *leaf1, *leaf2;
+
+ leaf1 = leaf1_bp->data;
+ leaf2 = leaf2_bp->data;
+ ASSERT((INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC) &&
+ (INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC));
+ if ( (INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0)
+ && (INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0)
+ && ( (INT_GET(leaf2->entries[ 0 ].hashval, ARCH_CONVERT) <
+ INT_GET(leaf1->entries[ 0 ].hashval, ARCH_CONVERT))
+ || (INT_GET(leaf2->entries[INT_GET(leaf2->hdr.count,
+ ARCH_CONVERT)-1].hashval, ARCH_CONVERT) <
+ INT_GET(leaf1->entries[INT_GET(leaf1->hdr.count,
+ ARCH_CONVERT)-1].hashval, ARCH_CONVERT))) ) {
+ return(1);
+ }
+ return(0);
+}
+
+/*
+ * Pick up the last hashvalue from a leaf block.
+ */
+xfs_dahash_t
+xfs_attr_leaf_lasthash(xfs_dabuf_t *bp, int *count)
+{
+ xfs_attr_leafblock_t *leaf;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ if (count)
+ *count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ if (INT_ISZERO(leaf->hdr.count, ARCH_CONVERT))
+ return(0);
+ return(INT_GET(leaf->entries[INT_GET(leaf->hdr.count,
+ ARCH_CONVERT)-1].hashval, ARCH_CONVERT));
+}
+
+/*
+ * Calculate the number of bytes used to store the indicated attribute
+ * (whether local or remote only calculate bytes in this block).
+ */
+int
+xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index)
+{
+ xfs_attr_leaf_name_local_t *name_loc;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+ int size;
+
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ if (leaf->entries[index].flags & XFS_ATTR_LOCAL) {
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, index);
+ size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(name_loc->namelen,
+ INT_GET(name_loc->valuelen,
+ ARCH_CONVERT));
+ } else {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, index);
+ size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(name_rmt->namelen);
+ }
+ return(size);
+}
+
+/*
+ * Calculate the number of bytes that would be required to store the new
+ * attribute (whether local or remote only calculate bytes in this block).
+ * This routine decides as a side effect whether the attribute will be
+ * a "local" or a "remote" attribute.
+ */
+int
+xfs_attr_leaf_newentsize(xfs_da_args_t *args, int blocksize, int *local)
+{
+ int size;
+
+ size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(args->namelen, args->valuelen);
+ if (size < XFS_ATTR_LEAF_ENTSIZE_LOCAL_MAX(blocksize)) {
+ if (local) {
+ *local = 1;
+ }
+ } else {
+ size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(args->namelen);
+ if (local) {
+ *local = 0;
+ }
+ }
+ return(size);
+}
+
+/*
+ * Copy out attribute list entries for attr_list(), for leaf attribute lists.
+ */
+int
+xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context)
+{
+ attrlist_cursor_kern_t *cursor;
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_entry_t *entry;
+ xfs_attr_leaf_name_local_t *name_loc;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+ int retval, i;
+
+ ASSERT(bp != NULL);
+ leaf = bp->data;
+ cursor = context->cursor;
+ cursor->initted = 1;
+
+ xfs_attr_trace_l_cl("blk start", context, leaf);
+
+ /*
+ * Re-find our place in the leaf block if this is a new syscall.
+ */
+ if (context->resynch) {
+ entry = &leaf->entries[0];
+ for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ entry++, i++) {
+ if (INT_GET(entry->hashval, ARCH_CONVERT)
+ == cursor->hashval) {
+ if (cursor->offset == context->dupcnt) {
+ context->dupcnt = 0;
+ break;
+ }
+ context->dupcnt++;
+ } else if (INT_GET(entry->hashval, ARCH_CONVERT)
+ > cursor->hashval) {
+ context->dupcnt = 0;
+ break;
+ }
+ }
+ if (i == INT_GET(leaf->hdr.count, ARCH_CONVERT)) {
+ xfs_attr_trace_l_c("not found", context);
+ return(0);
+ }
+ } else {
+ entry = &leaf->entries[0];
+ i = 0;
+ }
+ context->resynch = 0;
+
+ /*
+ * We have found our place, start copying out the new attributes.
+ */
+ retval = 0;
+ for ( ; (i < INT_GET(leaf->hdr.count, ARCH_CONVERT))
+ && (retval == 0); entry++, i++) {
+ attrnames_t *namesp;
+
+ if (INT_GET(entry->hashval, ARCH_CONVERT) != cursor->hashval) {
+ cursor->hashval = INT_GET(entry->hashval, ARCH_CONVERT);
+ cursor->offset = 0;
+ }
+
+ if (entry->flags & XFS_ATTR_INCOMPLETE)
+ continue; /* skip incomplete entries */
+ if (((context->flags & ATTR_ROOT) != 0) !=
+ ((entry->flags & XFS_ATTR_ROOT) != 0) &&
+ !(context->flags & ATTR_KERNFULLS))
+ continue; /* skip non-matching entries */
+
+ namesp = (entry->flags & XFS_ATTR_SECURE) ? &attr_secure :
+ ((entry->flags & XFS_ATTR_ROOT) ? &attr_trusted :
+ &attr_user);
+
+ if (entry->flags & XFS_ATTR_LOCAL) {
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
+ if (context->flags & ATTR_KERNOVAL) {
+ ASSERT(context->flags & ATTR_KERNAMELS);
+ context->count += namesp->attr_namelen +
+ (int)name_loc->namelen + 1;
+ } else {
+ retval = xfs_attr_put_listent(context, namesp,
+ (char *)name_loc->nameval,
+ (int)name_loc->namelen,
+ (int)INT_GET(name_loc->valuelen,
+ ARCH_CONVERT));
+ }
+ } else {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
+ if (context->flags & ATTR_KERNOVAL) {
+ ASSERT(context->flags & ATTR_KERNAMELS);
+ context->count += namesp->attr_namelen +
+ (int)name_rmt->namelen + 1;
+ } else {
+ retval = xfs_attr_put_listent(context, namesp,
+ (char *)name_rmt->name,
+ (int)name_rmt->namelen,
+ (int)INT_GET(name_rmt->valuelen,
+ ARCH_CONVERT));
+ }
+ }
+ if (retval == 0) {
+ cursor->offset++;
+ }
+ }
+ xfs_attr_trace_l_cl("blk end", context, leaf);
+ return(retval);
+}
+
+#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.
+ */
+/*ARGSUSED*/
+int
+xfs_attr_put_listent(xfs_attr_list_context_t *context,
+ attrnames_t *namesp, char *name, int namelen, int valuelen)
+{
+ attrlist_ent_t *aep;
+ int arraytop;
+
+ ASSERT(!(context->flags & ATTR_KERNOVAL));
+ if (context->flags & ATTR_KERNAMELS) {
+ char *offset;
+
+ ASSERT(context->count >= 0);
+
+ arraytop = context->count + namesp->attr_namelen + namelen + 1;
+ if (arraytop > context->firstu) {
+ context->count = -1; /* insufficient space */
+ return(1);
+ }
+ offset = (char *)context->alist + context->count;
+ strncpy(offset, namesp->attr_name, namesp->attr_namelen);
+ offset += namesp->attr_namelen;
+ strncpy(offset, name, namelen); /* real name */
+ offset += namelen;
+ *offset = '\0';
+ context->count += namesp->attr_namelen + namelen + 1;
+ return(0);
+ }
+
+ ASSERT(context->count >= 0);
+ ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
+ ASSERT(context->firstu >= sizeof(*context->alist));
+ ASSERT(context->firstu <= context->bufsize);
+
+ arraytop = sizeof(*context->alist) +
+ context->count * sizeof(context->alist->al_offset[0]);
+ context->firstu -= ATTR_ENTSIZE(namelen);
+ if (context->firstu < arraytop) {
+ xfs_attr_trace_l_c("buffer full", context);
+ context->alist->al_more = 1;
+ return(1);
+ }
+
+ aep = (attrlist_ent_t *)&(((char *)context->alist)[ context->firstu ]);
+ aep->a_valuelen = valuelen;
+ memcpy(aep->a_name, name, namelen);
+ aep->a_name[ namelen ] = 0;
+ context->alist->al_offset[ context->count++ ] = context->firstu;
+ context->alist->al_count = context->count;
+ xfs_attr_trace_l_c("add", context);
+ return(0);
+}
+
+/*========================================================================
+ * Manage the INCOMPLETE flag in a leaf entry
+ *========================================================================*/
+
+/*
+ * Clear the INCOMPLETE flag on an entry in a leaf block.
+ */
+int
+xfs_attr_leaf_clearflag(xfs_da_args_t *args)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_entry_t *entry;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+ xfs_dabuf_t *bp;
+ int error;
+#ifdef DEBUG
+ xfs_attr_leaf_name_local_t *name_loc;
+ int namelen;
+ char *name;
+#endif /* DEBUG */
+
+ /*
+ * Set up the operation.
+ */
+ error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
+ XFS_ATTR_FORK);
+ if (error) {
+ return(error);
+ }
+ ASSERT(bp != NULL);
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT));
+ ASSERT(args->index >= 0);
+ entry = &leaf->entries[ args->index ];
+ ASSERT(entry->flags & XFS_ATTR_INCOMPLETE);
+
+#ifdef DEBUG
+ if (entry->flags & XFS_ATTR_LOCAL) {
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
+ namelen = name_loc->namelen;
+ name = (char *)name_loc->nameval;
+ } else {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
+ namelen = name_rmt->namelen;
+ name = (char *)name_rmt->name;
+ }
+ ASSERT(INT_GET(entry->hashval, ARCH_CONVERT) == args->hashval);
+ ASSERT(namelen == args->namelen);
+ ASSERT(memcmp(name, args->name, namelen) == 0);
+#endif /* DEBUG */
+
+ entry->flags &= ~XFS_ATTR_INCOMPLETE;
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
+
+ if (args->rmtblkno) {
+ ASSERT((entry->flags & XFS_ATTR_LOCAL) == 0);
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
+ INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno);
+ INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
+ }
+ xfs_da_buf_done(bp);
+
+ /*
+ * Commit the flag value change and start the next trans in series.
+ */
+ error = xfs_attr_rolltrans(&args->trans, args->dp);
+
+ return(error);
+}
+
+/*
+ * Set the INCOMPLETE flag on an entry in a leaf block.
+ */
+int
+xfs_attr_leaf_setflag(xfs_da_args_t *args)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_entry_t *entry;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+ xfs_dabuf_t *bp;
+ int error;
+
+ /*
+ * Set up the operation.
+ */
+ error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
+ XFS_ATTR_FORK);
+ if (error) {
+ return(error);
+ }
+ ASSERT(bp != NULL);
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(args->index < INT_GET(leaf->hdr.count, ARCH_CONVERT));
+ ASSERT(args->index >= 0);
+ entry = &leaf->entries[ args->index ];
+
+ ASSERT((entry->flags & XFS_ATTR_INCOMPLETE) == 0);
+ entry->flags |= XFS_ATTR_INCOMPLETE;
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
+ if ((entry->flags & XFS_ATTR_LOCAL) == 0) {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
+ INT_ZERO(name_rmt->valueblk, ARCH_CONVERT);
+ INT_ZERO(name_rmt->valuelen, ARCH_CONVERT);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
+ }
+ xfs_da_buf_done(bp);
+
+ /*
+ * Commit the flag value change and start the next trans in series.
+ */
+ error = xfs_attr_rolltrans(&args->trans, args->dp);
+
+ return(error);
+}
+
+/*
+ * In a single transaction, clear the INCOMPLETE flag on the leaf entry
+ * given by args->blkno/index and set the INCOMPLETE flag on the leaf
+ * entry given by args->blkno2/index2.
+ *
+ * Note that they could be in different blocks, or in the same block.
+ */
+int
+xfs_attr_leaf_flipflags(xfs_da_args_t *args)
+{
+ xfs_attr_leafblock_t *leaf1, *leaf2;
+ xfs_attr_leaf_entry_t *entry1, *entry2;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+ xfs_dabuf_t *bp1, *bp2;
+ int error;
+#ifdef DEBUG
+ xfs_attr_leaf_name_local_t *name_loc;
+ int namelen1, namelen2;
+ char *name1, *name2;
+#endif /* DEBUG */
+
+ /*
+ * Read the block containing the "old" attr
+ */
+ error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp1,
+ XFS_ATTR_FORK);
+ if (error) {
+ return(error);
+ }
+ ASSERT(bp1 != NULL);
+
+ /*
+ * Read the block containing the "new" attr, if it is different
+ */
+ if (args->blkno2 != args->blkno) {
+ error = xfs_da_read_buf(args->trans, args->dp, args->blkno2,
+ -1, &bp2, XFS_ATTR_FORK);
+ if (error) {
+ return(error);
+ }
+ ASSERT(bp2 != NULL);
+ } else {
+ bp2 = bp1;
+ }
+
+ leaf1 = bp1->data;
+ ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(args->index < INT_GET(leaf1->hdr.count, ARCH_CONVERT));
+ ASSERT(args->index >= 0);
+ entry1 = &leaf1->entries[ args->index ];
+
+ leaf2 = bp2->data;
+ ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(args->index2 < INT_GET(leaf2->hdr.count, ARCH_CONVERT));
+ ASSERT(args->index2 >= 0);
+ entry2 = &leaf2->entries[ args->index2 ];
+
+#ifdef DEBUG
+ if (entry1->flags & XFS_ATTR_LOCAL) {
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf1, args->index);
+ namelen1 = name_loc->namelen;
+ name1 = (char *)name_loc->nameval;
+ } else {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);
+ namelen1 = name_rmt->namelen;
+ name1 = (char *)name_rmt->name;
+ }
+ if (entry2->flags & XFS_ATTR_LOCAL) {
+ name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf2, args->index2);
+ namelen2 = name_loc->namelen;
+ name2 = (char *)name_loc->nameval;
+ } else {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
+ namelen2 = name_rmt->namelen;
+ name2 = (char *)name_rmt->name;
+ }
+ ASSERT(INT_GET(entry1->hashval, ARCH_CONVERT) == INT_GET(entry2->hashval, ARCH_CONVERT));
+ ASSERT(namelen1 == namelen2);
+ ASSERT(memcmp(name1, name2, namelen1) == 0);
+#endif /* DEBUG */
+
+ ASSERT(entry1->flags & XFS_ATTR_INCOMPLETE);
+ ASSERT((entry2->flags & XFS_ATTR_INCOMPLETE) == 0);
+
+ entry1->flags &= ~XFS_ATTR_INCOMPLETE;
+ xfs_da_log_buf(args->trans, bp1,
+ XFS_DA_LOGRANGE(leaf1, entry1, sizeof(*entry1)));
+ if (args->rmtblkno) {
+ ASSERT((entry1->flags & XFS_ATTR_LOCAL) == 0);
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);
+ INT_SET(name_rmt->valueblk, ARCH_CONVERT, args->rmtblkno);
+ INT_SET(name_rmt->valuelen, ARCH_CONVERT, args->valuelen);
+ xfs_da_log_buf(args->trans, bp1,
+ XFS_DA_LOGRANGE(leaf1, name_rmt, sizeof(*name_rmt)));
+ }
+
+ entry2->flags |= XFS_ATTR_INCOMPLETE;
+ xfs_da_log_buf(args->trans, bp2,
+ XFS_DA_LOGRANGE(leaf2, entry2, sizeof(*entry2)));
+ if ((entry2->flags & XFS_ATTR_LOCAL) == 0) {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
+ INT_ZERO(name_rmt->valueblk, ARCH_CONVERT);
+ INT_ZERO(name_rmt->valuelen, ARCH_CONVERT);
+ xfs_da_log_buf(args->trans, bp2,
+ XFS_DA_LOGRANGE(leaf2, name_rmt, sizeof(*name_rmt)));
+ }
+ xfs_da_buf_done(bp1);
+ if (bp1 != bp2)
+ xfs_da_buf_done(bp2);
+
+ /*
+ * Commit the flag value change and start the next trans in series.
+ */
+ error = xfs_attr_rolltrans(&args->trans, args->dp);
+
+ return(error);
+}
+
+/*========================================================================
+ * Indiscriminately delete the entire attribute fork
+ *========================================================================*/
+
+/*
+ * Recurse (gasp!) through the attribute nodes until we find leaves.
+ * We're doing a depth-first traversal in order to invalidate everything.
+ */
+int
+xfs_attr_root_inactive(xfs_trans_t **trans, xfs_inode_t *dp)
+{
+ xfs_da_blkinfo_t *info;
+ xfs_daddr_t blkno;
+ xfs_dabuf_t *bp;
+ int error;
+
+ /*
+ * Read block 0 to see what we have to work with.
+ * We only get here if we have extents, since we remove
+ * the extents in reverse order the extent containing
+ * block 0 must still be there.
+ */
+ error = xfs_da_read_buf(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK);
+ if (error)
+ return(error);
+ blkno = xfs_da_blkno(bp);
+
+ /*
+ * Invalidate the tree, even if the "tree" is only a single leaf block.
+ * This is a depth-first traversal!
+ */
+ info = bp->data;
+ if (INT_GET(info->magic, ARCH_CONVERT) == XFS_DA_NODE_MAGIC) {
+ error = xfs_attr_node_inactive(trans, dp, bp, 1);
+ } else if (INT_GET(info->magic, ARCH_CONVERT) == XFS_ATTR_LEAF_MAGIC) {
+ error = xfs_attr_leaf_inactive(trans, dp, bp);
+ } else {
+ error = XFS_ERROR(EIO);
+ xfs_da_brelse(*trans, bp);
+ }
+ if (error)
+ return(error);
+
+ /*
+ * Invalidate the incore copy of the root block.
+ */
+ error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK);
+ if (error)
+ return(error);
+ xfs_da_binval(*trans, bp); /* remove from cache */
+ /*
+ * Commit the invalidate and start the next transaction.
+ */
+ error = xfs_attr_rolltrans(trans, dp);
+
+ return (error);
+}
+
+/*
+ * Recurse (gasp!) through the attribute nodes until we find leaves.
+ * We're doing a depth-first traversal in order to invalidate everything.
+ */
+int
+xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp,
+ int level)
+{
+ xfs_da_blkinfo_t *info;
+ xfs_da_intnode_t *node;
+ xfs_dablk_t child_fsb;
+ xfs_daddr_t parent_blkno, child_blkno;
+ int error, count, i;
+ xfs_dabuf_t *child_bp;
+
+ /*
+ * Since this code is recursive (gasp!) we must protect ourselves.
+ */
+ if (level > XFS_DA_NODE_MAXDEPTH) {
+ xfs_da_brelse(*trans, bp); /* no locks for later trans */
+ return(XFS_ERROR(EIO));
+ }
+
+ node = bp->data;
+ ASSERT(INT_GET(node->hdr.info.magic, ARCH_CONVERT)
+ == XFS_DA_NODE_MAGIC);
+ parent_blkno = xfs_da_blkno(bp); /* save for re-read later */
+ count = INT_GET(node->hdr.count, ARCH_CONVERT);
+ if (!count) {
+ xfs_da_brelse(*trans, bp);
+ return(0);
+ }
+ child_fsb = INT_GET(node->btree[0].before, ARCH_CONVERT);
+ xfs_da_brelse(*trans, bp); /* no locks for later trans */
+
+ /*
+ * If this is the node level just above the leaves, simply loop
+ * over the leaves removing all of them. If this is higher up
+ * in the tree, recurse downward.
+ */
+ for (i = 0; i < count; i++) {
+ /*
+ * Read the subsidiary block to see what we have to work with.
+ * Don't do this in a transaction. This is a depth-first
+ * traversal of the tree so we may deal with many blocks
+ * before we come back to this one.
+ */
+ error = xfs_da_read_buf(*trans, dp, child_fsb, -2, &child_bp,
+ XFS_ATTR_FORK);
+ if (error)
+ return(error);
+ if (child_bp) {
+ /* save for re-read later */
+ child_blkno = xfs_da_blkno(child_bp);
+
+ /*
+ * Invalidate the subtree, however we have to.
+ */
+ info = child_bp->data;
+ if (INT_GET(info->magic, ARCH_CONVERT)
+ == XFS_DA_NODE_MAGIC) {
+ error = xfs_attr_node_inactive(trans, dp,
+ child_bp, level+1);
+ } else if (INT_GET(info->magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC) {
+ error = xfs_attr_leaf_inactive(trans, dp,
+ child_bp);
+ } else {
+ error = XFS_ERROR(EIO);
+ xfs_da_brelse(*trans, child_bp);
+ }
+ if (error)
+ return(error);
+
+ /*
+ * Remove the subsidiary block from the cache
+ * and from the log.
+ */
+ error = xfs_da_get_buf(*trans, dp, 0, child_blkno,
+ &child_bp, XFS_ATTR_FORK);
+ if (error)
+ return(error);
+ xfs_da_binval(*trans, child_bp);
+ }
+
+ /*
+ * If we're not done, re-read the parent to get the next
+ * child block number.
+ */
+ if ((i+1) < count) {
+ error = xfs_da_read_buf(*trans, dp, 0, parent_blkno,
+ &bp, XFS_ATTR_FORK);
+ if (error)
+ return(error);
+ child_fsb = INT_GET(node->btree[i+1].before, ARCH_CONVERT);
+ xfs_da_brelse(*trans, bp);
+ }
+ /*
+ * Atomically commit the whole invalidate stuff.
+ */
+ if ((error = xfs_attr_rolltrans(trans, dp)))
+ return (error);
+ }
+
+ return(0);
+}
+
+/*
+ * Invalidate all of the "remote" value regions pointed to by a particular
+ * leaf block.
+ * Note that we must release the lock on the buffer so that we are not
+ * caught holding something that the logging code wants to flush to disk.
+ */
+int
+xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp)
+{
+ xfs_attr_leafblock_t *leaf;
+ xfs_attr_leaf_entry_t *entry;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+ xfs_attr_inactive_list_t *list, *lp;
+ int error, count, size, tmp, i;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
+ == XFS_ATTR_LEAF_MAGIC);
+
+ /*
+ * Count the number of "remote" value extents.
+ */
+ count = 0;
+ entry = &leaf->entries[0];
+ for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
+ if ( INT_GET(entry->nameidx, ARCH_CONVERT)
+ && ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
+ if (!INT_ISZERO(name_rmt->valueblk, ARCH_CONVERT))
+ count++;
+ }
+ }
+
+ /*
+ * If there are no "remote" values, we're done.
+ */
+ if (count == 0) {
+ xfs_da_brelse(*trans, bp);
+ return(0);
+ }
+
+ /*
+ * Allocate storage for a list of all the "remote" value extents.
+ */
+ size = count * sizeof(xfs_attr_inactive_list_t);
+ list = (xfs_attr_inactive_list_t *)kmem_alloc(size, KM_SLEEP);
+
+ /*
+ * Identify each of the "remote" value extents.
+ */
+ lp = list;
+ entry = &leaf->entries[0];
+ for (i = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); entry++, i++) {
+ if ( INT_GET(entry->nameidx, ARCH_CONVERT)
+ && ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
+ name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
+ if (!INT_ISZERO(name_rmt->valueblk, ARCH_CONVERT)) {
+ /* both on-disk, don't endian flip twice */
+ lp->valueblk = name_rmt->valueblk;
+ INT_SET(lp->valuelen, ARCH_CONVERT,
+ XFS_B_TO_FSB(dp->i_mount,
+ INT_GET(name_rmt->valuelen,
+ ARCH_CONVERT)));
+ lp++;
+ }
+ }
+ }
+ xfs_da_brelse(*trans, bp); /* unlock for trans. in freextent() */
+
+ /*
+ * Invalidate each of the "remote" value extents.
+ */
+ error = 0;
+ for (lp = list, i = 0; i < count; i++, lp++) {
+ tmp = xfs_attr_leaf_freextent(trans, dp,
+ INT_GET(lp->valueblk,
+ ARCH_CONVERT),
+ INT_GET(lp->valuelen,
+ ARCH_CONVERT));
+ if (error == 0)
+ error = tmp; /* save only the 1st errno */
+ }
+
+ kmem_free((xfs_caddr_t)list, size);
+ return(error);
+}
+
+/*
+ * Look at all the extents for this logical region,
+ * invalidate any buffers that are incore/in transactions.
+ */
+int
+xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp,
+ xfs_dablk_t blkno, int blkcnt)
+{
+ xfs_bmbt_irec_t map;
+ xfs_dablk_t tblkno;
+ int tblkcnt, dblkcnt, nmap, error;
+ xfs_daddr_t dblkno;
+ xfs_buf_t *bp;
+
+ /*
+ * Roll through the "value", invalidating the attribute value's
+ * blocks.
+ */
+ tblkno = blkno;
+ tblkcnt = blkcnt;
+ while (tblkcnt > 0) {
+ /*
+ * Try to remember where we decided to put the value.
+ */
+ nmap = 1;
+ error = xfs_bmapi(*trans, dp, (xfs_fileoff_t)tblkno, tblkcnt,
+ XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
+ NULL, 0, &map, &nmap, NULL);
+ if (error) {
+ return(error);
+ }
+ ASSERT(nmap == 1);
+ ASSERT(map.br_startblock != DELAYSTARTBLOCK);
+
+ /*
+ * If it's a hole, these are already unmapped
+ * so there's nothing to invalidate.
+ */
+ if (map.br_startblock != HOLESTARTBLOCK) {
+
+ dblkno = XFS_FSB_TO_DADDR(dp->i_mount,
+ map.br_startblock);
+ dblkcnt = XFS_FSB_TO_BB(dp->i_mount,
+ map.br_blockcount);
+ bp = xfs_trans_get_buf(*trans,
+ dp->i_mount->m_ddev_targp,
+ dblkno, dblkcnt, XFS_BUF_LOCK);
+ xfs_trans_binval(*trans, bp);
+ /*
+ * Roll to next transaction.
+ */
+ if ((error = xfs_attr_rolltrans(trans, dp)))
+ return (error);
+ }
+
+ tblkno += map.br_blockcount;
+ tblkcnt -= map.br_blockcount;
+ }
+
+ return(0);
+}
+
+
+/*
+ * Roll from one trans in the sequence of PERMANENT transactions to the next.
+ */
+int
+xfs_attr_rolltrans(xfs_trans_t **transp, xfs_inode_t *dp)
+{
+ xfs_trans_t *trans;
+ unsigned int logres, count;
+ int error;
+
+ /*
+ * Ensure that the inode is always logged.
+ */
+ trans = *transp;
+ xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
+
+ /*
+ * Copy the critical parameters from one trans to the next.
+ */
+ logres = trans->t_log_res;
+ count = trans->t_log_count;
+ *transp = xfs_trans_dup(trans);
+
+ /*
+ * Commit the current transaction.
+ * If this commit failed, then it'd just unlock those items that
+ * are not marked ihold. That also means that a filesystem shutdown
+ * is in progress. The caller takes the responsibility to cancel
+ * the duplicate transaction that gets returned.
+ */
+ if ((error = xfs_trans_commit(trans, 0, NULL)))
+ return (error);
+
+ trans = *transp;
+
+ /*
+ * Reserve space in the log for th next transaction.
+ * This also pushes items in the "AIL", the list of logged items,
+ * out to disk if they are taking up space at the tail of the log
+ * that we want to use. This requires that either nothing be locked
+ * across this call, or that anything that is locked be logged in
+ * the prior and the next transactions.
+ */
+ error = xfs_trans_reserve(trans, 0, logres, 0,
+ XFS_TRANS_PERM_LOG_RES, count);
+ /*
+ * Ensure that the inode is in the new transaction and locked.
+ */
+ if (!error) {
+ xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
+ xfs_trans_ihold(trans, dp);
+ }
+ return (error);
+
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)