--- /dev/null
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * Copyright (c) 2013 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_bit.h"
+#include "xfs_sb.h"
+#include "xfs_mount.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
+#include "xfs_inode.h"
+#include "xfs_trans.h"
+#include "xfs_inode_item.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_bmap.h"
+#include "xfs_attr_sf.h"
+#include "xfs_attr_remote.h"
+#include "xfs_attr.h"
+#include "xfs_attr_leaf.h"
+#include "xfs_error.h"
+#include "xfs_trace.h"
+#include "xfs_buf_item.h"
+#include "xfs_cksum.h"
+#include "xfs_dir2.h"
+
+
+/*
+ * 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_attr3_leaf_create(struct xfs_da_args *args,
+ xfs_dablk_t which_block, struct xfs_buf **bpp);
+STATIC int xfs_attr3_leaf_add_work(struct xfs_buf *leaf_buffer,
+ struct xfs_attr3_icleaf_hdr *ichdr,
+ struct xfs_da_args *args, int freemap_index);
+STATIC void xfs_attr3_leaf_compact(struct xfs_da_args *args,
+ struct xfs_attr3_icleaf_hdr *ichdr,
+ struct xfs_buf *leaf_buffer);
+STATIC void xfs_attr3_leaf_rebalance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2);
+STATIC int xfs_attr3_leaf_figure_balance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *leaf_blk_1,
+ struct xfs_attr3_icleaf_hdr *ichdr1,
+ xfs_da_state_blk_t *leaf_blk_2,
+ struct xfs_attr3_icleaf_hdr *ichdr2,
+ int *number_entries_in_blk1,
+ int *number_usedbytes_in_blk1);
+
+/*
+ * Utility routines.
+ */
+STATIC void xfs_attr3_leaf_moveents(struct xfs_da_args *args,
+ struct xfs_attr_leafblock *src_leaf,
+ struct xfs_attr3_icleaf_hdr *src_ichdr, int src_start,
+ struct xfs_attr_leafblock *dst_leaf,
+ struct xfs_attr3_icleaf_hdr *dst_ichdr, int dst_start,
+ int move_count);
+STATIC int xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index);
+
+/*
+ * attr3 block 'firstused' conversion helpers.
+ *
+ * firstused refers to the offset of the first used byte of the nameval region
+ * of an attr leaf block. The region starts at the tail of the block and expands
+ * backwards towards the middle. As such, firstused is initialized to the block
+ * size for an empty leaf block and is reduced from there.
+ *
+ * The attr3 block size is pegged to the fsb size and the maximum fsb is 64k.
+ * The in-core firstused field is 32-bit and thus supports the maximum fsb size.
+ * The on-disk field is only 16-bit, however, and overflows at 64k. Since this
+ * only occurs at exactly 64k, we use zero as a magic on-disk value to represent
+ * the attr block size. The following helpers manage the conversion between the
+ * in-core and on-disk formats.
+ */
+
+static void
+xfs_attr3_leaf_firstused_from_disk(
+ struct xfs_da_geometry *geo,
+ struct xfs_attr3_icleaf_hdr *to,
+ struct xfs_attr_leafblock *from)
+{
+ struct xfs_attr3_leaf_hdr *hdr3;
+
+ if (from->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC)) {
+ hdr3 = (struct xfs_attr3_leaf_hdr *) from;
+ to->firstused = be16_to_cpu(hdr3->firstused);
+ } else {
+ to->firstused = be16_to_cpu(from->hdr.firstused);
+ }
+
+ /*
+ * Convert from the magic fsb size value to actual blocksize. This
+ * should only occur for empty blocks when the block size overflows
+ * 16-bits.
+ */
+ if (to->firstused == XFS_ATTR3_LEAF_NULLOFF) {
+ ASSERT(!to->count && !to->usedbytes);
+ ASSERT(geo->blksize > USHRT_MAX);
+ to->firstused = geo->blksize;
+ }
+}
+
+static void
+xfs_attr3_leaf_firstused_to_disk(
+ struct xfs_da_geometry *geo,
+ struct xfs_attr_leafblock *to,
+ struct xfs_attr3_icleaf_hdr *from)
+{
+ struct xfs_attr3_leaf_hdr *hdr3;
+ uint32_t firstused;
+
+ /* magic value should only be seen on disk */
+ ASSERT(from->firstused != XFS_ATTR3_LEAF_NULLOFF);
+
+ /*
+ * Scale down the 32-bit in-core firstused value to the 16-bit on-disk
+ * value. This only overflows at the max supported value of 64k. Use the
+ * magic on-disk value to represent block size in this case.
+ */
+ firstused = from->firstused;
+ if (firstused > USHRT_MAX) {
+ ASSERT(from->firstused == geo->blksize);
+ firstused = XFS_ATTR3_LEAF_NULLOFF;
+ }
+
+ if (from->magic == XFS_ATTR3_LEAF_MAGIC) {
+ hdr3 = (struct xfs_attr3_leaf_hdr *) to;
+ hdr3->firstused = cpu_to_be16(firstused);
+ } else {
+ to->hdr.firstused = cpu_to_be16(firstused);
+ }
+}
+
+void
+xfs_attr3_leaf_hdr_from_disk(
+ struct xfs_da_geometry *geo,
+ struct xfs_attr3_icleaf_hdr *to,
+ struct xfs_attr_leafblock *from)
+{
+ int i;
+
+ ASSERT(from->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC) ||
+ from->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC));
+
+ if (from->hdr.info.magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC)) {
+ struct xfs_attr3_leaf_hdr *hdr3 = (struct xfs_attr3_leaf_hdr *)from;
+
+ to->forw = be32_to_cpu(hdr3->info.hdr.forw);
+ to->back = be32_to_cpu(hdr3->info.hdr.back);
+ to->magic = be16_to_cpu(hdr3->info.hdr.magic);
+ to->count = be16_to_cpu(hdr3->count);
+ to->usedbytes = be16_to_cpu(hdr3->usedbytes);
+ xfs_attr3_leaf_firstused_from_disk(geo, to, from);
+ to->holes = hdr3->holes;
+
+ for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
+ to->freemap[i].base = be16_to_cpu(hdr3->freemap[i].base);
+ to->freemap[i].size = be16_to_cpu(hdr3->freemap[i].size);
+ }
+ return;
+ }
+ to->forw = be32_to_cpu(from->hdr.info.forw);
+ to->back = be32_to_cpu(from->hdr.info.back);
+ to->magic = be16_to_cpu(from->hdr.info.magic);
+ to->count = be16_to_cpu(from->hdr.count);
+ to->usedbytes = be16_to_cpu(from->hdr.usedbytes);
+ xfs_attr3_leaf_firstused_from_disk(geo, to, from);
+ to->holes = from->hdr.holes;
+
+ for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
+ to->freemap[i].base = be16_to_cpu(from->hdr.freemap[i].base);
+ to->freemap[i].size = be16_to_cpu(from->hdr.freemap[i].size);
+ }
+}
+
+void
+xfs_attr3_leaf_hdr_to_disk(
+ struct xfs_da_geometry *geo,
+ struct xfs_attr_leafblock *to,
+ struct xfs_attr3_icleaf_hdr *from)
+{
+ int i;
+
+ ASSERT(from->magic == XFS_ATTR_LEAF_MAGIC ||
+ from->magic == XFS_ATTR3_LEAF_MAGIC);
+
+ if (from->magic == XFS_ATTR3_LEAF_MAGIC) {
+ struct xfs_attr3_leaf_hdr *hdr3 = (struct xfs_attr3_leaf_hdr *)to;
+
+ hdr3->info.hdr.forw = cpu_to_be32(from->forw);
+ hdr3->info.hdr.back = cpu_to_be32(from->back);
+ hdr3->info.hdr.magic = cpu_to_be16(from->magic);
+ hdr3->count = cpu_to_be16(from->count);
+ hdr3->usedbytes = cpu_to_be16(from->usedbytes);
+ xfs_attr3_leaf_firstused_to_disk(geo, to, from);
+ hdr3->holes = from->holes;
+ hdr3->pad1 = 0;
+
+ for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
+ hdr3->freemap[i].base = cpu_to_be16(from->freemap[i].base);
+ hdr3->freemap[i].size = cpu_to_be16(from->freemap[i].size);
+ }
+ return;
+ }
+ to->hdr.info.forw = cpu_to_be32(from->forw);
+ to->hdr.info.back = cpu_to_be32(from->back);
+ to->hdr.info.magic = cpu_to_be16(from->magic);
+ to->hdr.count = cpu_to_be16(from->count);
+ to->hdr.usedbytes = cpu_to_be16(from->usedbytes);
+ xfs_attr3_leaf_firstused_to_disk(geo, to, from);
+ to->hdr.holes = from->holes;
+ to->hdr.pad1 = 0;
+
+ for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
+ to->hdr.freemap[i].base = cpu_to_be16(from->freemap[i].base);
+ to->hdr.freemap[i].size = cpu_to_be16(from->freemap[i].size);
+ }
+}
+
+static bool
+xfs_attr3_leaf_verify(
+ struct xfs_buf *bp)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+ struct xfs_attr_leafblock *leaf = bp->b_addr;
+ struct xfs_attr3_icleaf_hdr ichdr;
+
+ xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
+
+ if (xfs_sb_version_hascrc(&mp->m_sb)) {
+ struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
+
+ if (ichdr.magic != XFS_ATTR3_LEAF_MAGIC)
+ return false;
+
+ if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_uuid))
+ return false;
+ if (be64_to_cpu(hdr3->info.blkno) != bp->b_bn)
+ return false;
+ } else {
+ if (ichdr.magic != XFS_ATTR_LEAF_MAGIC)
+ return false;
+ }
+ if (ichdr.count == 0)
+ return false;
+
+ /* XXX: need to range check rest of attr header values */
+ /* XXX: hash order check? */
+
+ return true;
+}
+
+static void
+xfs_attr3_leaf_write_verify(
+ struct xfs_buf *bp)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+ struct xfs_buf_log_item *bip = bp->b_fspriv;
+ struct xfs_attr3_leaf_hdr *hdr3 = bp->b_addr;
+
+ if (!xfs_attr3_leaf_verify(bp)) {
+ xfs_buf_ioerror(bp, -EFSCORRUPTED);
+ xfs_verifier_error(bp);
+ return;
+ }
+
+ if (!xfs_sb_version_hascrc(&mp->m_sb))
+ return;
+
+ if (bip)
+ hdr3->info.lsn = cpu_to_be64(bip->bli_item.li_lsn);
+
+ xfs_buf_update_cksum(bp, XFS_ATTR3_LEAF_CRC_OFF);
+}
+
+/*
+ * leaf/node format detection on trees is sketchy, so a node read can be done on
+ * leaf level blocks when detection identifies the tree as a node format tree
+ * incorrectly. In this case, we need to swap the verifier to match the correct
+ * format of the block being read.
+ */
+static void
+xfs_attr3_leaf_read_verify(
+ struct xfs_buf *bp)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+
+ if (xfs_sb_version_hascrc(&mp->m_sb) &&
+ !xfs_buf_verify_cksum(bp, XFS_ATTR3_LEAF_CRC_OFF))
+ xfs_buf_ioerror(bp, -EFSBADCRC);
+ else if (!xfs_attr3_leaf_verify(bp))
+ xfs_buf_ioerror(bp, -EFSCORRUPTED);
+
+ if (bp->b_error)
+ xfs_verifier_error(bp);
+}
+
+const struct xfs_buf_ops xfs_attr3_leaf_buf_ops = {
+ .verify_read = xfs_attr3_leaf_read_verify,
+ .verify_write = xfs_attr3_leaf_write_verify,
+};
+
+int
+xfs_attr3_leaf_read(
+ struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ xfs_dablk_t bno,
+ xfs_daddr_t mappedbno,
+ struct xfs_buf **bpp)
+{
+ int err;
+
+ err = xfs_da_read_buf(tp, dp, bno, mappedbno, bpp,
+ XFS_ATTR_FORK, &xfs_attr3_leaf_buf_ops);
+ if (!err && tp)
+ xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_ATTR_LEAF_BUF);
+ return err;
+}
+
+/*========================================================================
+ * Namespace helper routines
+ *========================================================================*/
+
+/*
+ * If namespace bits don't match return 0.
+ * If all match then return 1.
+ */
+STATIC int
+xfs_attr_namesp_match(int arg_flags, int ondisk_flags)
+{
+ return XFS_ATTR_NSP_ONDISK(ondisk_flags) == XFS_ATTR_NSP_ARGS_TO_ONDISK(arg_flags);
+}
+
+
+/*========================================================================
+ * External routines when attribute fork size < XFS_LITINO(mp).
+ *========================================================================*/
+
+/*
+ * Query whether the requested number of additional bytes of extended
+ * attribute space will be able to fit inline.
+ *
+ * Returns zero if not, else the di_forkoff fork offset to be used in the
+ * literal area for attribute data once the new bytes have been added.
+ *
+ * di_forkoff must be 8 byte aligned, hence is stored as a >>3 value;
+ * special case for dev/uuid inodes, they have fixed size data forks.
+ */
+int
+xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes)
+{
+ int offset;
+ int minforkoff; /* lower limit on valid forkoff locations */
+ int maxforkoff; /* upper limit on valid forkoff locations */
+ int dsize;
+ xfs_mount_t *mp = dp->i_mount;
+
+ /* rounded down */
+ offset = (XFS_LITINO(mp, dp->i_d.di_version) - bytes) >> 3;
+
+ switch (dp->i_d.di_format) {
+ case XFS_DINODE_FMT_DEV:
+ minforkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
+ return (offset >= minforkoff) ? minforkoff : 0;
+ case XFS_DINODE_FMT_UUID:
+ minforkoff = roundup(sizeof(uuid_t), 8) >> 3;
+ return (offset >= minforkoff) ? minforkoff : 0;
+ }
+
+ /*
+ * If the requested numbers of bytes is smaller or equal to the
+ * current attribute fork size we can always proceed.
+ *
+ * Note that if_bytes in the data fork might actually be larger than
+ * the current data fork size is due to delalloc extents. In that
+ * case either the extent count will go down when they are converted
+ * to real extents, or the delalloc conversion will take care of the
+ * literal area rebalancing.
+ */
+ if (bytes <= XFS_IFORK_ASIZE(dp))
+ return dp->i_d.di_forkoff;
+
+ /*
+ * For attr2 we can try to move the forkoff if there is space in the
+ * literal area, but for the old format we are done if there is no
+ * space in the fixed attribute fork.
+ */
+ if (!(mp->m_flags & XFS_MOUNT_ATTR2))
+ return 0;
+
+ dsize = dp->i_df.if_bytes;
+
+ switch (dp->i_d.di_format) {
+ case XFS_DINODE_FMT_EXTENTS:
+ /*
+ * If there is no attr fork and the data fork is extents,
+ * determine if creating the default attr fork will result
+ * in the extents form migrating to btree. If so, the
+ * minimum offset only needs to be the space required for
+ * the btree root.
+ */
+ if (!dp->i_d.di_forkoff && dp->i_df.if_bytes >
+ xfs_default_attroffset(dp))
+ dsize = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ /*
+ * If we have a data btree then keep forkoff if we have one,
+ * otherwise we are adding a new attr, so then we set
+ * minforkoff to where the btree root can finish so we have
+ * plenty of room for attrs
+ */
+ if (dp->i_d.di_forkoff) {
+ if (offset < dp->i_d.di_forkoff)
+ return 0;
+ return dp->i_d.di_forkoff;
+ }
+ dsize = XFS_BMAP_BROOT_SPACE(mp, dp->i_df.if_broot);
+ break;
+ }
+
+ /*
+ * A data fork btree root must have space for at least
+ * MINDBTPTRS key/ptr pairs if the data fork is small or empty.
+ */
+ minforkoff = MAX(dsize, XFS_BMDR_SPACE_CALC(MINDBTPTRS));
+ minforkoff = roundup(minforkoff, 8) >> 3;
+
+ /* attr fork btree root can have at least this many key/ptr pairs */
+ maxforkoff = XFS_LITINO(mp, dp->i_d.di_version) -
+ XFS_BMDR_SPACE_CALC(MINABTPTRS);
+ maxforkoff = maxforkoff >> 3; /* rounded down */
+
+ if (offset >= maxforkoff)
+ return maxforkoff;
+ if (offset >= minforkoff)
+ return offset;
+ return 0;
+}
+
+/*
+ * Switch on the ATTR2 superblock bit (implies also FEATURES2)
+ */
+STATIC void
+xfs_sbversion_add_attr2(xfs_mount_t *mp, xfs_trans_t *tp)
+{
+ if ((mp->m_flags & XFS_MOUNT_ATTR2) &&
+ !(xfs_sb_version_hasattr2(&mp->m_sb))) {
+ spin_lock(&mp->m_sb_lock);
+ if (!xfs_sb_version_hasattr2(&mp->m_sb)) {
+ xfs_sb_version_addattr2(&mp->m_sb);
+ spin_unlock(&mp->m_sb_lock);
+ xfs_log_sb(tp);
+ } else
+ spin_unlock(&mp->m_sb_lock);
+ }
+}
+
+/*
+ * Create the initial contents of a shortform attribute list.
+ */
+void
+xfs_attr_shortform_create(xfs_da_args_t *args)
+{
+ xfs_attr_sf_hdr_t *hdr;
+ xfs_inode_t *dp;
+ xfs_ifork_t *ifp;
+
+ trace_xfs_attr_sf_create(args);
+
+ 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;
+ hdr->count = 0;
+ hdr->totsize = cpu_to_be16(sizeof(*hdr));
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
+}
+
+/*
+ * Add a name/value pair to the shortform attribute list.
+ * Overflow from the inode has already been checked for.
+ */
+void
+xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff)
+{
+ xfs_attr_shortform_t *sf;
+ xfs_attr_sf_entry_t *sfe;
+ int i, offset, size;
+ xfs_mount_t *mp;
+ xfs_inode_t *dp;
+ xfs_ifork_t *ifp;
+
+ trace_xfs_attr_sf_add(args);
+
+ dp = args->dp;
+ mp = dp->i_mount;
+ dp->i_d.di_forkoff = forkoff;
+
+ 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 < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
+#ifdef DEBUG
+ if (sfe->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
+ continue;
+ if (!xfs_attr_namesp_match(args->flags, sfe->flags))
+ continue;
+ ASSERT(0);
+#endif
+ }
+
+ 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;
+ sfe->valuelen = args->valuelen;
+ sfe->flags = XFS_ATTR_NSP_ARGS_TO_ONDISK(args->flags);
+ memcpy(sfe->nameval, args->name, args->namelen);
+ memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen);
+ sf->hdr.count++;
+ be16_add_cpu(&sf->hdr.totsize, size);
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
+
+ xfs_sbversion_add_attr2(mp, args->trans);
+}
+
+/*
+ * After the last attribute is removed revert to original inode format,
+ * making all literal area available to the data fork once more.
+ */
+void
+xfs_attr_fork_remove(
+ struct xfs_inode *ip,
+ struct xfs_trans *tp)
+{
+ xfs_idestroy_fork(ip, XFS_ATTR_FORK);
+ ip->i_d.di_forkoff = 0;
+ ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
+
+ ASSERT(ip->i_d.di_anextents == 0);
+ ASSERT(ip->i_afp == NULL);
+
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+}
+
+/*
+ * Remove an attribute 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_mount_t *mp;
+ xfs_inode_t *dp;
+
+ trace_xfs_attr_sf_remove(args);
+
+ dp = args->dp;
+ mp = dp->i_mount;
+ base = sizeof(xfs_attr_sf_hdr_t);
+ sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
+ sfe = &sf->list[0];
+ end = sf->hdr.count;
+ for (i = 0; i < end; 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 (!xfs_attr_namesp_match(args->flags, sfe->flags))
+ continue;
+ break;
+ }
+ if (i == end)
+ return -ENOATTR;
+
+ /*
+ * Fix up the attribute fork data, covering the hole
+ */
+ end = base + size;
+ totsize = be16_to_cpu(sf->hdr.totsize);
+ if (end != totsize)
+ memmove(&((char *)sf)[base], &((char *)sf)[end], totsize - end);
+ sf->hdr.count--;
+ be16_add_cpu(&sf->hdr.totsize, -size);
+
+ /*
+ * Fix up the start offset of the attribute fork
+ */
+ totsize -= size;
+ if (totsize == sizeof(xfs_attr_sf_hdr_t) &&
+ (mp->m_flags & XFS_MOUNT_ATTR2) &&
+ (dp->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
+ !(args->op_flags & XFS_DA_OP_ADDNAME)) {
+ xfs_attr_fork_remove(dp, args->trans);
+ } else {
+ xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
+ dp->i_d.di_forkoff = xfs_attr_shortform_bytesfit(dp, totsize);
+ ASSERT(dp->i_d.di_forkoff);
+ ASSERT(totsize > sizeof(xfs_attr_sf_hdr_t) ||
+ (args->op_flags & XFS_DA_OP_ADDNAME) ||
+ !(mp->m_flags & XFS_MOUNT_ATTR2) ||
+ dp->i_d.di_format == XFS_DINODE_FMT_BTREE);
+ xfs_trans_log_inode(args->trans, dp,
+ XFS_ILOG_CORE | XFS_ILOG_ADATA);
+ }
+
+ xfs_sbversion_add_attr2(mp, args->trans);
+
+ 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;
+
+ trace_xfs_attr_sf_lookup(args);
+
+ 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 < sf->hdr.count;
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
+ if (sfe->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
+ continue;
+ if (!xfs_attr_namesp_match(args->flags, sfe->flags))
+ continue;
+ return -EEXIST;
+ }
+ return -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_afp->if_flags == XFS_IFINLINE);
+ sf = (xfs_attr_shortform_t *)args->dp->i_afp->if_u1.if_data;
+ sfe = &sf->list[0];
+ for (i = 0; i < sf->hdr.count;
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
+ if (sfe->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
+ continue;
+ if (!xfs_attr_namesp_match(args->flags, sfe->flags))
+ continue;
+ if (args->flags & ATTR_KERNOVAL) {
+ args->valuelen = sfe->valuelen;
+ return -EEXIST;
+ }
+ if (args->valuelen < sfe->valuelen) {
+ args->valuelen = sfe->valuelen;
+ return -ERANGE;
+ }
+ args->valuelen = sfe->valuelen;
+ memcpy(args->value, &sfe->nameval[args->namelen],
+ args->valuelen);
+ return -EEXIST;
+ }
+ return -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;
+ struct xfs_buf *bp;
+ xfs_ifork_t *ifp;
+
+ trace_xfs_attr_sf_to_leaf(args);
+
+ dp = args->dp;
+ ifp = dp->i_afp;
+ sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
+ size = be16_to_cpu(sf->hdr.totsize);
+ 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);
+ xfs_bmap_local_to_extents_empty(dp, 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_attr3_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.geo = args->geo;
+ nargs.firstblock = args->firstblock;
+ nargs.flist = args->flist;
+ nargs.total = args->total;
+ nargs.whichfork = XFS_ATTR_FORK;
+ nargs.trans = args->trans;
+ nargs.op_flags = XFS_DA_OP_OKNOENT;
+
+ sfe = &sf->list[0];
+ for (i = 0; i < sf->hdr.count; i++) {
+ nargs.name = sfe->nameval;
+ nargs.namelen = sfe->namelen;
+ nargs.value = &sfe->nameval[nargs.namelen];
+ nargs.valuelen = sfe->valuelen;
+ nargs.hashval = xfs_da_hashname(sfe->nameval,
+ sfe->namelen);
+ nargs.flags = XFS_ATTR_NSP_ONDISK_TO_ARGS(sfe->flags);
+ error = xfs_attr3_leaf_lookup_int(bp, &nargs); /* set a->index */
+ ASSERT(error == -ENOATTR);
+ error = xfs_attr3_leaf_add(bp, &nargs);
+ ASSERT(error != -ENOSPC);
+ if (error)
+ goto out;
+ sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
+ }
+ error = 0;
+
+out:
+ kmem_free(tmpbuffer);
+ return error;
+}
+
+/*
+ * Check a leaf attribute block to see if all the entries would fit into
+ * a shortform attribute list.
+ */
+int
+xfs_attr_shortform_allfit(
+ struct xfs_buf *bp,
+ struct xfs_inode *dp)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr_leaf_entry *entry;
+ xfs_attr_leaf_name_local_t *name_loc;
+ struct xfs_attr3_icleaf_hdr leafhdr;
+ int bytes;
+ int i;
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+
+ leaf = bp->b_addr;
+ xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
+ entry = xfs_attr3_leaf_entryp(leaf);
+
+ bytes = sizeof(struct xfs_attr_sf_hdr);
+ for (i = 0; i < leafhdr.count; 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_attr3_leaf_name_local(leaf, i);
+ if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX)
+ return 0;
+ if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX)
+ return 0;
+ bytes += sizeof(struct xfs_attr_sf_entry) - 1
+ + name_loc->namelen
+ + be16_to_cpu(name_loc->valuelen);
+ }
+ if ((dp->i_mount->m_flags & XFS_MOUNT_ATTR2) &&
+ (dp->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
+ (bytes == sizeof(struct xfs_attr_sf_hdr)))
+ return -1;
+ return xfs_attr_shortform_bytesfit(dp, bytes);
+}
+
+/*
+ * Convert a leaf attribute list to shortform attribute list
+ */
+int
+xfs_attr3_leaf_to_shortform(
+ struct xfs_buf *bp,
+ struct xfs_da_args *args,
+ int forkoff)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr3_icleaf_hdr ichdr;
+ struct xfs_attr_leaf_entry *entry;
+ struct xfs_attr_leaf_name_local *name_loc;
+ struct xfs_da_args nargs;
+ struct xfs_inode *dp = args->dp;
+ char *tmpbuffer;
+ int error;
+ int i;
+
+ trace_xfs_attr_leaf_to_sf(args);
+
+ tmpbuffer = kmem_alloc(args->geo->blksize, KM_SLEEP);
+ if (!tmpbuffer)
+ return -ENOMEM;
+
+ memcpy(tmpbuffer, bp->b_addr, args->geo->blksize);
+
+ leaf = (xfs_attr_leafblock_t *)tmpbuffer;
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
+ entry = xfs_attr3_leaf_entryp(leaf);
+
+ /* XXX (dgc): buffer is about to be marked stale - why zero it? */
+ memset(bp->b_addr, 0, args->geo->blksize);
+
+ /*
+ * Clean out the prior contents of the attribute list.
+ */
+ error = xfs_da_shrink_inode(args, 0, bp);
+ if (error)
+ goto out;
+
+ if (forkoff == -1) {
+ ASSERT(dp->i_mount->m_flags & XFS_MOUNT_ATTR2);
+ ASSERT(dp->i_d.di_format != XFS_DINODE_FMT_BTREE);
+ xfs_attr_fork_remove(dp, args->trans);
+ goto out;
+ }
+
+ xfs_attr_shortform_create(args);
+
+ /*
+ * Copy the attributes
+ */
+ memset((char *)&nargs, 0, sizeof(nargs));
+ nargs.geo = args->geo;
+ 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.op_flags = XFS_DA_OP_OKNOENT;
+
+ for (i = 0; i < ichdr.count; entry++, i++) {
+ if (entry->flags & XFS_ATTR_INCOMPLETE)
+ continue; /* don't copy partial entries */
+ if (!entry->nameidx)
+ continue;
+ ASSERT(entry->flags & XFS_ATTR_LOCAL);
+ name_loc = xfs_attr3_leaf_name_local(leaf, i);
+ nargs.name = name_loc->nameval;
+ nargs.namelen = name_loc->namelen;
+ nargs.value = &name_loc->nameval[nargs.namelen];
+ nargs.valuelen = be16_to_cpu(name_loc->valuelen);
+ nargs.hashval = be32_to_cpu(entry->hashval);
+ nargs.flags = XFS_ATTR_NSP_ONDISK_TO_ARGS(entry->flags);
+ xfs_attr_shortform_add(&nargs, forkoff);
+ }
+ error = 0;
+
+out:
+ kmem_free(tmpbuffer);
+ return error;
+}
+
+/*
+ * Convert from using a single leaf to a root node and a leaf.
+ */
+int
+xfs_attr3_leaf_to_node(
+ struct xfs_da_args *args)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr3_icleaf_hdr icleafhdr;
+ struct xfs_attr_leaf_entry *entries;
+ struct xfs_da_node_entry *btree;
+ struct xfs_da3_icnode_hdr icnodehdr;
+ struct xfs_da_intnode *node;
+ struct xfs_inode *dp = args->dp;
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_buf *bp1 = NULL;
+ struct xfs_buf *bp2 = NULL;
+ xfs_dablk_t blkno;
+ int error;
+
+ trace_xfs_attr_leaf_to_node(args);
+
+ error = xfs_da_grow_inode(args, &blkno);
+ if (error)
+ goto out;
+ error = xfs_attr3_leaf_read(args->trans, dp, 0, -1, &bp1);
+ if (error)
+ goto out;
+
+ error = xfs_da_get_buf(args->trans, dp, blkno, -1, &bp2, XFS_ATTR_FORK);
+ if (error)
+ goto out;
+
+ /* copy leaf to new buffer, update identifiers */
+ xfs_trans_buf_set_type(args->trans, bp2, XFS_BLFT_ATTR_LEAF_BUF);
+ bp2->b_ops = bp1->b_ops;
+ memcpy(bp2->b_addr, bp1->b_addr, args->geo->blksize);
+ if (xfs_sb_version_hascrc(&mp->m_sb)) {
+ struct xfs_da3_blkinfo *hdr3 = bp2->b_addr;
+ hdr3->blkno = cpu_to_be64(bp2->b_bn);
+ }
+ xfs_trans_log_buf(args->trans, bp2, 0, args->geo->blksize - 1);
+
+ /*
+ * Set up the new root node.
+ */
+ error = xfs_da3_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK);
+ if (error)
+ goto out;
+ node = bp1->b_addr;
+ dp->d_ops->node_hdr_from_disk(&icnodehdr, node);
+ btree = dp->d_ops->node_tree_p(node);
+
+ leaf = bp2->b_addr;
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &icleafhdr, leaf);
+ entries = xfs_attr3_leaf_entryp(leaf);
+
+ /* both on-disk, don't endian-flip twice */
+ btree[0].hashval = entries[icleafhdr.count - 1].hashval;
+ btree[0].before = cpu_to_be32(blkno);
+ icnodehdr.count = 1;
+ dp->d_ops->node_hdr_to_disk(node, &icnodehdr);
+ xfs_trans_log_buf(args->trans, bp1, 0, args->geo->blksize - 1);
+ error = 0;
+out:
+ 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.
+ */
+STATIC int
+xfs_attr3_leaf_create(
+ struct xfs_da_args *args,
+ xfs_dablk_t blkno,
+ struct xfs_buf **bpp)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr3_icleaf_hdr ichdr;
+ struct xfs_inode *dp = args->dp;
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_buf *bp;
+ int error;
+
+ trace_xfs_attr_leaf_create(args);
+
+ error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp,
+ XFS_ATTR_FORK);
+ if (error)
+ return error;
+ bp->b_ops = &xfs_attr3_leaf_buf_ops;
+ xfs_trans_buf_set_type(args->trans, bp, XFS_BLFT_ATTR_LEAF_BUF);
+ leaf = bp->b_addr;
+ memset(leaf, 0, args->geo->blksize);
+
+ memset(&ichdr, 0, sizeof(ichdr));
+ ichdr.firstused = args->geo->blksize;
+
+ if (xfs_sb_version_hascrc(&mp->m_sb)) {
+ struct xfs_da3_blkinfo *hdr3 = bp->b_addr;
+
+ ichdr.magic = XFS_ATTR3_LEAF_MAGIC;
+
+ hdr3->blkno = cpu_to_be64(bp->b_bn);
+ hdr3->owner = cpu_to_be64(dp->i_ino);
+ uuid_copy(&hdr3->uuid, &mp->m_sb.sb_uuid);
+
+ ichdr.freemap[0].base = sizeof(struct xfs_attr3_leaf_hdr);
+ } else {
+ ichdr.magic = XFS_ATTR_LEAF_MAGIC;
+ ichdr.freemap[0].base = sizeof(struct xfs_attr_leaf_hdr);
+ }
+ ichdr.freemap[0].size = ichdr.firstused - ichdr.freemap[0].base;
+
+ xfs_attr3_leaf_hdr_to_disk(args->geo, leaf, &ichdr);
+ xfs_trans_log_buf(args->trans, bp, 0, args->geo->blksize - 1);
+
+ *bpp = bp;
+ return 0;
+}
+
+/*
+ * Split the leaf node, rebalance, then add the new entry.
+ */
+int
+xfs_attr3_leaf_split(
+ struct xfs_da_state *state,
+ struct xfs_da_state_blk *oldblk,
+ struct xfs_da_state_blk *newblk)
+{
+ xfs_dablk_t blkno;
+ int error;
+
+ trace_xfs_attr_leaf_split(state->args);
+
+ /*
+ * 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_attr3_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_attr3_leaf_rebalance(state, oldblk, newblk);
+ error = xfs_da3_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) {
+ trace_xfs_attr_leaf_add_old(state->args);
+ error = xfs_attr3_leaf_add(oldblk->bp, state->args);
+ } else {
+ trace_xfs_attr_leaf_add_new(state->args);
+ error = xfs_attr3_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_attr3_leaf_add(
+ struct xfs_buf *bp,
+ struct xfs_da_args *args)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr3_icleaf_hdr ichdr;
+ int tablesize;
+ int entsize;
+ int sum;
+ int tmp;
+ int i;
+
+ trace_xfs_attr_leaf_add(args);
+
+ leaf = bp->b_addr;
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
+ ASSERT(args->index >= 0 && args->index <= ichdr.count);
+ entsize = xfs_attr_leaf_newentsize(args, NULL);
+
+ /*
+ * Search through freemap for first-fit on new name length.
+ * (may need to figure in size of entry struct too)
+ */
+ tablesize = (ichdr.count + 1) * sizeof(xfs_attr_leaf_entry_t)
+ + xfs_attr3_leaf_hdr_size(leaf);
+ for (sum = 0, i = XFS_ATTR_LEAF_MAPSIZE - 1; i >= 0; i--) {
+ if (tablesize > ichdr.firstused) {
+ sum += ichdr.freemap[i].size;
+ continue;
+ }
+ if (!ichdr.freemap[i].size)
+ continue; /* no space in this map */
+ tmp = entsize;
+ if (ichdr.freemap[i].base < ichdr.firstused)
+ tmp += sizeof(xfs_attr_leaf_entry_t);
+ if (ichdr.freemap[i].size >= tmp) {
+ tmp = xfs_attr3_leaf_add_work(bp, &ichdr, args, i);
+ goto out_log_hdr;
+ }
+ sum += ichdr.freemap[i].size;
+ }
+
+ /*
+ * 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 (!ichdr.holes && sum < entsize)
+ return -ENOSPC;
+
+ /*
+ * Compact the entries to coalesce free space.
+ * This may change the hdr->count via dropping INCOMPLETE entries.
+ */
+ xfs_attr3_leaf_compact(args, &ichdr, 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 (ichdr.freemap[0].size < (entsize + sizeof(xfs_attr_leaf_entry_t))) {
+ tmp = -ENOSPC;
+ goto out_log_hdr;
+ }
+
+ tmp = xfs_attr3_leaf_add_work(bp, &ichdr, args, 0);
+
+out_log_hdr:
+ xfs_attr3_leaf_hdr_to_disk(args->geo, leaf, &ichdr);
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, &leaf->hdr,
+ xfs_attr3_leaf_hdr_size(leaf)));
+ return tmp;
+}
+
+/*
+ * Add a name to a leaf attribute list structure.
+ */
+STATIC int
+xfs_attr3_leaf_add_work(
+ struct xfs_buf *bp,
+ struct xfs_attr3_icleaf_hdr *ichdr,
+ struct xfs_da_args *args,
+ int mapindex)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr_leaf_entry *entry;
+ struct xfs_attr_leaf_name_local *name_loc;
+ struct xfs_attr_leaf_name_remote *name_rmt;
+ struct xfs_mount *mp;
+ int tmp;
+ int i;
+
+ trace_xfs_attr_leaf_add_work(args);
+
+ leaf = bp->b_addr;
+ ASSERT(mapindex >= 0 && mapindex < XFS_ATTR_LEAF_MAPSIZE);
+ ASSERT(args->index >= 0 && args->index <= ichdr->count);
+
+ /*
+ * Force open some space in the entry array and fill it in.
+ */
+ entry = &xfs_attr3_leaf_entryp(leaf)[args->index];
+ if (args->index < ichdr->count) {
+ tmp = ichdr->count - args->index;
+ tmp *= sizeof(xfs_attr_leaf_entry_t);
+ memmove(entry + 1, entry, tmp);
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
+ }
+ ichdr->count++;
+
+ /*
+ * Allocate space for the new string (at the end of the run).
+ */
+ mp = args->trans->t_mountp;
+ ASSERT(ichdr->freemap[mapindex].base < args->geo->blksize);
+ ASSERT((ichdr->freemap[mapindex].base & 0x3) == 0);
+ ASSERT(ichdr->freemap[mapindex].size >=
+ xfs_attr_leaf_newentsize(args, NULL));
+ ASSERT(ichdr->freemap[mapindex].size < args->geo->blksize);
+ ASSERT((ichdr->freemap[mapindex].size & 0x3) == 0);
+
+ ichdr->freemap[mapindex].size -= xfs_attr_leaf_newentsize(args, &tmp);
+
+ entry->nameidx = cpu_to_be16(ichdr->freemap[mapindex].base +
+ ichdr->freemap[mapindex].size);
+ entry->hashval = cpu_to_be32(args->hashval);
+ entry->flags = tmp ? XFS_ATTR_LOCAL : 0;
+ entry->flags |= XFS_ATTR_NSP_ARGS_TO_ONDISK(args->flags);
+ if (args->op_flags & XFS_DA_OP_RENAME) {
+ entry->flags |= XFS_ATTR_INCOMPLETE;
+ if ((args->blkno2 == args->blkno) &&
+ (args->index2 <= args->index)) {
+ args->index2++;
+ }
+ }
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
+ ASSERT((args->index == 0) ||
+ (be32_to_cpu(entry->hashval) >= be32_to_cpu((entry-1)->hashval)));
+ ASSERT((args->index == ichdr->count - 1) ||
+ (be32_to_cpu(entry->hashval) <= be32_to_cpu((entry+1)->hashval)));
+
+ /*
+ * 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_attr3_leaf_name_local(leaf, args->index);
+ name_loc->namelen = args->namelen;
+ name_loc->valuelen = cpu_to_be16(args->valuelen);
+ memcpy((char *)name_loc->nameval, args->name, args->namelen);
+ memcpy((char *)&name_loc->nameval[args->namelen], args->value,
+ be16_to_cpu(name_loc->valuelen));
+ } else {
+ name_rmt = xfs_attr3_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 */
+ name_rmt->valuelen = 0;
+ name_rmt->valueblk = 0;
+ args->rmtblkno = 1;
+ args->rmtblkcnt = xfs_attr3_rmt_blocks(mp, args->valuelen);
+ args->rmtvaluelen = args->valuelen;
+ }
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, xfs_attr3_leaf_name(leaf, args->index),
+ xfs_attr_leaf_entsize(leaf, args->index)));
+
+ /*
+ * Update the control info for this leaf node
+ */
+ if (be16_to_cpu(entry->nameidx) < ichdr->firstused)
+ ichdr->firstused = be16_to_cpu(entry->nameidx);
+
+ ASSERT(ichdr->firstused >= ichdr->count * sizeof(xfs_attr_leaf_entry_t)
+ + xfs_attr3_leaf_hdr_size(leaf));
+ tmp = (ichdr->count - 1) * sizeof(xfs_attr_leaf_entry_t)
+ + xfs_attr3_leaf_hdr_size(leaf);
+
+ for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
+ if (ichdr->freemap[i].base == tmp) {
+ ichdr->freemap[i].base += sizeof(xfs_attr_leaf_entry_t);
+ ichdr->freemap[i].size -= sizeof(xfs_attr_leaf_entry_t);
+ }
+ }
+ ichdr->usedbytes += xfs_attr_leaf_entsize(leaf, args->index);
+ return 0;
+}
+
+/*
+ * Garbage collect a leaf attribute list block by copying it to a new buffer.
+ */
+STATIC void
+xfs_attr3_leaf_compact(
+ struct xfs_da_args *args,
+ struct xfs_attr3_icleaf_hdr *ichdr_dst,
+ struct xfs_buf *bp)
+{
+ struct xfs_attr_leafblock *leaf_src;
+ struct xfs_attr_leafblock *leaf_dst;
+ struct xfs_attr3_icleaf_hdr ichdr_src;
+ struct xfs_trans *trans = args->trans;
+ char *tmpbuffer;
+
+ trace_xfs_attr_leaf_compact(args);
+
+ tmpbuffer = kmem_alloc(args->geo->blksize, KM_SLEEP);
+ memcpy(tmpbuffer, bp->b_addr, args->geo->blksize);
+ memset(bp->b_addr, 0, args->geo->blksize);
+ leaf_src = (xfs_attr_leafblock_t *)tmpbuffer;
+ leaf_dst = bp->b_addr;
+
+ /*
+ * Copy the on-disk header back into the destination buffer to ensure
+ * all the information in the header that is not part of the incore
+ * header structure is preserved.
+ */
+ memcpy(bp->b_addr, tmpbuffer, xfs_attr3_leaf_hdr_size(leaf_src));
+
+ /* Initialise the incore headers */
+ ichdr_src = *ichdr_dst; /* struct copy */
+ ichdr_dst->firstused = args->geo->blksize;
+ ichdr_dst->usedbytes = 0;
+ ichdr_dst->count = 0;
+ ichdr_dst->holes = 0;
+ ichdr_dst->freemap[0].base = xfs_attr3_leaf_hdr_size(leaf_src);
+ ichdr_dst->freemap[0].size = ichdr_dst->firstused -
+ ichdr_dst->freemap[0].base;
+
+ /* write the header back to initialise the underlying buffer */
+ xfs_attr3_leaf_hdr_to_disk(args->geo, leaf_dst, ichdr_dst);
+
+ /*
+ * Copy all entry's in the same (sorted) order,
+ * but allocate name/value pairs packed and in sequence.
+ */
+ xfs_attr3_leaf_moveents(args, leaf_src, &ichdr_src, 0,
+ leaf_dst, ichdr_dst, 0, ichdr_src.count);
+ /*
+ * this logs the entire buffer, but the caller must write the header
+ * back to the buffer when it is finished modifying it.
+ */
+ xfs_trans_log_buf(trans, bp, 0, args->geo->blksize - 1);
+
+ kmem_free(tmpbuffer);
+}
+
+/*
+ * Compare two leaf blocks "order".
+ * Return 0 unless leaf2 should go before leaf1.
+ */
+static int
+xfs_attr3_leaf_order(
+ struct xfs_buf *leaf1_bp,
+ struct xfs_attr3_icleaf_hdr *leaf1hdr,
+ struct xfs_buf *leaf2_bp,
+ struct xfs_attr3_icleaf_hdr *leaf2hdr)
+{
+ struct xfs_attr_leaf_entry *entries1;
+ struct xfs_attr_leaf_entry *entries2;
+
+ entries1 = xfs_attr3_leaf_entryp(leaf1_bp->b_addr);
+ entries2 = xfs_attr3_leaf_entryp(leaf2_bp->b_addr);
+ if (leaf1hdr->count > 0 && leaf2hdr->count > 0 &&
+ ((be32_to_cpu(entries2[0].hashval) <
+ be32_to_cpu(entries1[0].hashval)) ||
+ (be32_to_cpu(entries2[leaf2hdr->count - 1].hashval) <
+ be32_to_cpu(entries1[leaf1hdr->count - 1].hashval)))) {
+ return 1;
+ }
+ return 0;
+}
+
+int
+xfs_attr_leaf_order(
+ struct xfs_buf *leaf1_bp,
+ struct xfs_buf *leaf2_bp)
+{
+ struct xfs_attr3_icleaf_hdr ichdr1;
+ struct xfs_attr3_icleaf_hdr ichdr2;
+ struct xfs_mount *mp = leaf1_bp->b_target->bt_mount;
+
+ xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr1, leaf1_bp->b_addr);
+ xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr2, leaf2_bp->b_addr);
+ return xfs_attr3_leaf_order(leaf1_bp, &ichdr1, leaf2_bp, &ichdr2);
+}
+
+/*
+ * 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_attr3_leaf_rebalance(
+ struct xfs_da_state *state,
+ struct xfs_da_state_blk *blk1,
+ struct xfs_da_state_blk *blk2)
+{
+ struct xfs_da_args *args;
+ struct xfs_attr_leafblock *leaf1;
+ struct xfs_attr_leafblock *leaf2;
+ struct xfs_attr3_icleaf_hdr ichdr1;
+ struct xfs_attr3_icleaf_hdr ichdr2;
+ struct xfs_attr_leaf_entry *entries1;
+ struct xfs_attr_leaf_entry *entries2;
+ int count;
+ int totallen;
+ int max;
+ int space;
+ int swap;
+
+ /*
+ * Set up environment.
+ */
+ ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC);
+ ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC);
+ leaf1 = blk1->bp->b_addr;
+ leaf2 = blk2->bp->b_addr;
+ xfs_attr3_leaf_hdr_from_disk(state->args->geo, &ichdr1, leaf1);
+ xfs_attr3_leaf_hdr_from_disk(state->args->geo, &ichdr2, leaf2);
+ ASSERT(ichdr2.count == 0);
+ args = state->args;
+
+ trace_xfs_attr_leaf_rebalance(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_attr3_leaf_order(blk1->bp, &ichdr1, blk2->bp, &ichdr2)) {
+ struct xfs_da_state_blk *tmp_blk;
+ struct xfs_attr3_icleaf_hdr tmp_ichdr;
+
+ tmp_blk = blk1;
+ blk1 = blk2;
+ blk2 = tmp_blk;
+
+ /* struct copies to swap them rather than reconverting */
+ tmp_ichdr = ichdr1;
+ ichdr1 = ichdr2;
+ ichdr2 = tmp_ichdr;
+
+ leaf1 = blk1->bp->b_addr;
+ leaf2 = blk2->bp->b_addr;
+ swap = 1;
+ }
+
+ /*
+ * 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_attr3_leaf_figure_balance(state, blk1, &ichdr1,
+ blk2, &ichdr2,
+ &count, &totallen);
+ if (swap)
+ state->inleaf = !state->inleaf;
+
+ /*
+ * Move any entries required from leaf to leaf:
+ */
+ if (count < ichdr1.count) {
+ /*
+ * Figure the total bytes to be added to the destination leaf.
+ */
+ /* number entries being moved */
+ count = ichdr1.count - count;
+ space = ichdr1.usedbytes - totallen;
+ space += count * sizeof(xfs_attr_leaf_entry_t);
+
+ /*
+ * leaf2 is the destination, compact it if it looks tight.
+ */
+ max = ichdr2.firstused - xfs_attr3_leaf_hdr_size(leaf1);
+ max -= ichdr2.count * sizeof(xfs_attr_leaf_entry_t);
+ if (space > max)
+ xfs_attr3_leaf_compact(args, &ichdr2, blk2->bp);
+
+ /*
+ * Move high entries from leaf1 to low end of leaf2.
+ */
+ xfs_attr3_leaf_moveents(args, leaf1, &ichdr1,
+ ichdr1.count - count, leaf2, &ichdr2, 0, count);
+
+ } else if (count > ichdr1.count) {
+ /*
+ * I assert that since all callers pass in an empty
+ * second buffer, this code should never execute.
+ */
+ ASSERT(0);
+
+ /*
+ * Figure the total bytes to be added to the destination leaf.
+ */
+ /* number entries being moved */
+ count -= ichdr1.count;
+ space = totallen - ichdr1.usedbytes;
+ space += count * sizeof(xfs_attr_leaf_entry_t);
+
+ /*
+ * leaf1 is the destination, compact it if it looks tight.
+ */
+ max = ichdr1.firstused - xfs_attr3_leaf_hdr_size(leaf1);
+ max -= ichdr1.count * sizeof(xfs_attr_leaf_entry_t);
+ if (space > max)
+ xfs_attr3_leaf_compact(args, &ichdr1, blk1->bp);
+
+ /*
+ * Move low entries from leaf2 to high end of leaf1.
+ */
+ xfs_attr3_leaf_moveents(args, leaf2, &ichdr2, 0, leaf1, &ichdr1,
+ ichdr1.count, count);
+ }
+
+ xfs_attr3_leaf_hdr_to_disk(state->args->geo, leaf1, &ichdr1);
+ xfs_attr3_leaf_hdr_to_disk(state->args->geo, leaf2, &ichdr2);
+ xfs_trans_log_buf(args->trans, blk1->bp, 0, args->geo->blksize - 1);
+ xfs_trans_log_buf(args->trans, blk2->bp, 0, args->geo->blksize - 1);
+
+ /*
+ * Copy out last hashval in each block for B-tree code.
+ */
+ entries1 = xfs_attr3_leaf_entryp(leaf1);
+ entries2 = xfs_attr3_leaf_entryp(leaf2);
+ blk1->hashval = be32_to_cpu(entries1[ichdr1.count - 1].hashval);
+ blk2->hashval = be32_to_cpu(entries2[ichdr2.count - 1].hashval);
+
+ /*
+ * 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 > ichdr1.count) {
+ ASSERT(state->inleaf == 0);
+ blk2->index = blk1->index - ichdr1.count;
+ args->index = args->index2 = blk2->index;
+ args->blkno = args->blkno2 = blk2->blkno;
+ } else if (blk1->index == ichdr1.count) {
+ if (state->inleaf) {
+ args->index = blk1->index;
+ args->blkno = blk1->blkno;
+ args->index2 = 0;
+ args->blkno2 = blk2->blkno;
+ } else {
+ /*
+ * On a double leaf split, the original attr location
+ * is already stored in blkno2/index2, so don't
+ * overwrite it overwise we corrupt the tree.
+ */
+ blk2->index = blk1->index - ichdr1.count;
+ args->index = blk2->index;
+ args->blkno = blk2->blkno;
+ if (!state->extravalid) {
+ /*
+ * set the new attr location to match the old
+ * one and let the higher level split code
+ * decide where in the leaf to place it.
+ */
+ args->index2 = blk2->index;
+ 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_attr3_leaf_figure_balance(
+ struct xfs_da_state *state,
+ struct xfs_da_state_blk *blk1,
+ struct xfs_attr3_icleaf_hdr *ichdr1,
+ struct xfs_da_state_blk *blk2,
+ struct xfs_attr3_icleaf_hdr *ichdr2,
+ int *countarg,
+ int *usedbytesarg)
+{
+ struct xfs_attr_leafblock *leaf1 = blk1->bp->b_addr;
+ struct xfs_attr_leafblock *leaf2 = blk2->bp->b_addr;
+ struct xfs_attr_leaf_entry *entry;
+ int count;
+ int max;
+ int index;
+ int totallen = 0;
+ int half;
+ int lastdelta;
+ int foundit = 0;
+ int tmp;
+
+ /*
+ * Examine entries until we reduce the absolute difference in
+ * byte usage between the two blocks to a minimum.
+ */
+ max = ichdr1->count + ichdr2->count;
+ half = (max + 1) * sizeof(*entry);
+ half += ichdr1->usedbytes + ichdr2->usedbytes +
+ xfs_attr_leaf_newentsize(state->args, NULL);
+ half /= 2;
+ lastdelta = state->args->geo->blksize;
+ entry = xfs_attr3_leaf_entryp(leaf1);
+ 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, 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 == ichdr1->count) {
+ leaf1 = leaf2;
+ entry = xfs_attr3_leaf_entryp(leaf1);
+ 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, 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_attr3_leaf_toosmall(
+ struct xfs_da_state *state,
+ int *action)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_da_state_blk *blk;
+ struct xfs_attr3_icleaf_hdr ichdr;
+ struct xfs_buf *bp;
+ xfs_dablk_t blkno;
+ int bytes;
+ int forward;
+ int error;
+ int retval;
+ int i;
+
+ trace_xfs_attr_leaf_toosmall(state->args);
+
+ /*
+ * 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 ];
+ leaf = blk->bp->b_addr;
+ xfs_attr3_leaf_hdr_from_disk(state->args->geo, &ichdr, leaf);
+ bytes = xfs_attr3_leaf_hdr_size(leaf) +
+ ichdr.count * sizeof(xfs_attr_leaf_entry_t) +
+ ichdr.usedbytes;
+ if (bytes > (state->args->geo->blksize >> 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 (arbitrarily)
+ * to merge with the forward block unless it is NULL.
+ */
+ if (ichdr.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 = (ichdr.forw != 0);
+ memcpy(&state->altpath, &state->path, sizeof(state->path));
+ error = xfs_da3_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 = ichdr.forw < ichdr.back;
+ for (i = 0; i < 2; forward = !forward, i++) {
+ struct xfs_attr3_icleaf_hdr ichdr2;
+ if (forward)
+ blkno = ichdr.forw;
+ else
+ blkno = ichdr.back;
+ if (blkno == 0)
+ continue;
+ error = xfs_attr3_leaf_read(state->args->trans, state->args->dp,
+ blkno, -1, &bp);
+ if (error)
+ return error;
+
+ xfs_attr3_leaf_hdr_from_disk(state->args->geo, &ichdr2, bp->b_addr);
+
+ bytes = state->args->geo->blksize -
+ (state->args->geo->blksize >> 2) -
+ ichdr.usedbytes - ichdr2.usedbytes -
+ ((ichdr.count + ichdr2.count) *
+ sizeof(xfs_attr_leaf_entry_t)) -
+ xfs_attr3_leaf_hdr_size(leaf);
+
+ xfs_trans_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_da3_path_shift(state, &state->altpath, forward,
+ 0, &retval);
+ } else {
+ error = xfs_da3_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_attr3_leaf_remove(
+ struct xfs_buf *bp,
+ struct xfs_da_args *args)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr3_icleaf_hdr ichdr;
+ struct xfs_attr_leaf_entry *entry;
+ int before;
+ int after;
+ int smallest;
+ int entsize;
+ int tablesize;
+ int tmp;
+ int i;
+
+ trace_xfs_attr_leaf_remove(args);
+
+ leaf = bp->b_addr;
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
+
+ ASSERT(ichdr.count > 0 && ichdr.count < args->geo->blksize / 8);
+ ASSERT(args->index >= 0 && args->index < ichdr.count);
+ ASSERT(ichdr.firstused >= ichdr.count * sizeof(*entry) +
+ xfs_attr3_leaf_hdr_size(leaf));
+
+ entry = &xfs_attr3_leaf_entryp(leaf)[args->index];
+
+ ASSERT(be16_to_cpu(entry->nameidx) >= ichdr.firstused);
+ ASSERT(be16_to_cpu(entry->nameidx) < args->geo->blksize);
+
+ /*
+ * 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 = ichdr.count * sizeof(xfs_attr_leaf_entry_t)
+ + xfs_attr3_leaf_hdr_size(leaf);
+ tmp = ichdr.freemap[0].size;
+ 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; i++) {
+ ASSERT(ichdr.freemap[i].base < args->geo->blksize);
+ ASSERT(ichdr.freemap[i].size < args->geo->blksize);
+ if (ichdr.freemap[i].base == tablesize) {
+ ichdr.freemap[i].base -= sizeof(xfs_attr_leaf_entry_t);
+ ichdr.freemap[i].size += sizeof(xfs_attr_leaf_entry_t);
+ }
+
+ if (ichdr.freemap[i].base + ichdr.freemap[i].size ==
+ be16_to_cpu(entry->nameidx)) {
+ before = i;
+ } else if (ichdr.freemap[i].base ==
+ (be16_to_cpu(entry->nameidx) + entsize)) {
+ after = i;
+ } else if (ichdr.freemap[i].size < tmp) {
+ tmp = ichdr.freemap[i].size;
+ smallest = i;
+ }
+ }
+
+ /*
+ * Coalesce adjacent freemap regions,
+ * or replace the smallest region.
+ */
+ if ((before >= 0) || (after >= 0)) {
+ if ((before >= 0) && (after >= 0)) {
+ ichdr.freemap[before].size += entsize;
+ ichdr.freemap[before].size += ichdr.freemap[after].size;
+ ichdr.freemap[after].base = 0;
+ ichdr.freemap[after].size = 0;
+ } else if (before >= 0) {
+ ichdr.freemap[before].size += entsize;
+ } else {
+ ichdr.freemap[after].base = be16_to_cpu(entry->nameidx);
+ ichdr.freemap[after].size += entsize;
+ }
+ } else {
+ /*
+ * Replace smallest region (if it is smaller than free'd entry)
+ */
+ if (ichdr.freemap[smallest].size < entsize) {
+ ichdr.freemap[smallest].base = be16_to_cpu(entry->nameidx);
+ ichdr.freemap[smallest].size = entsize;
+ }
+ }
+
+ /*
+ * Did we remove the first entry?
+ */
+ if (be16_to_cpu(entry->nameidx) == ichdr.firstused)
+ smallest = 1;
+ else
+ smallest = 0;
+
+ /*
+ * Compress the remaining entries and zero out the removed stuff.
+ */
+ memset(xfs_attr3_leaf_name(leaf, args->index), 0, entsize);
+ ichdr.usedbytes -= entsize;
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, xfs_attr3_leaf_name(leaf, args->index),
+ entsize));
+
+ tmp = (ichdr.count - args->index) * sizeof(xfs_attr_leaf_entry_t);
+ memmove(entry, entry + 1, tmp);
+ ichdr.count--;
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(xfs_attr_leaf_entry_t)));
+
+ entry = &xfs_attr3_leaf_entryp(leaf)[ichdr.count];
+ memset(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 = args->geo->blksize;
+ entry = xfs_attr3_leaf_entryp(leaf);
+ for (i = ichdr.count - 1; i >= 0; entry++, i--) {
+ ASSERT(be16_to_cpu(entry->nameidx) >= ichdr.firstused);
+ ASSERT(be16_to_cpu(entry->nameidx) < args->geo->blksize);
+
+ if (be16_to_cpu(entry->nameidx) < tmp)
+ tmp = be16_to_cpu(entry->nameidx);
+ }
+ ichdr.firstused = tmp;
+ ASSERT(ichdr.firstused != 0);
+ } else {
+ ichdr.holes = 1; /* mark as needing compaction */
+ }
+ xfs_attr3_leaf_hdr_to_disk(args->geo, leaf, &ichdr);
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, &leaf->hdr,
+ xfs_attr3_leaf_hdr_size(leaf)));
+
+ /*
+ * Check if leaf is less than 50% full, caller may want to
+ * "join" the leaf with a sibling if so.
+ */
+ tmp = ichdr.usedbytes + xfs_attr3_leaf_hdr_size(leaf) +
+ ichdr.count * sizeof(xfs_attr_leaf_entry_t);
+
+ return tmp < args->geo->magicpct; /* leaf is < 37% full */
+}
+
+/*
+ * Move all the attribute list entries from drop_leaf into save_leaf.
+ */
+void
+xfs_attr3_leaf_unbalance(
+ struct xfs_da_state *state,
+ struct xfs_da_state_blk *drop_blk,
+ struct xfs_da_state_blk *save_blk)
+{
+ struct xfs_attr_leafblock *drop_leaf = drop_blk->bp->b_addr;
+ struct xfs_attr_leafblock *save_leaf = save_blk->bp->b_addr;
+ struct xfs_attr3_icleaf_hdr drophdr;
+ struct xfs_attr3_icleaf_hdr savehdr;
+ struct xfs_attr_leaf_entry *entry;
+
+ trace_xfs_attr_leaf_unbalance(state->args);
+
+ drop_leaf = drop_blk->bp->b_addr;
+ save_leaf = save_blk->bp->b_addr;
+ xfs_attr3_leaf_hdr_from_disk(state->args->geo, &drophdr, drop_leaf);
+ xfs_attr3_leaf_hdr_from_disk(state->args->geo, &savehdr, save_leaf);
+ entry = xfs_attr3_leaf_entryp(drop_leaf);
+
+ /*
+ * Save last hashval from dying block for later Btree fixup.
+ */
+ drop_blk->hashval = be32_to_cpu(entry[drophdr.count - 1].hashval);
+
+ /*
+ * 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 (savehdr.holes == 0) {
+ /*
+ * dest leaf has no holes, so we add there. May need
+ * to make some room in the entry array.
+ */
+ if (xfs_attr3_leaf_order(save_blk->bp, &savehdr,
+ drop_blk->bp, &drophdr)) {
+ xfs_attr3_leaf_moveents(state->args,
+ drop_leaf, &drophdr, 0,
+ save_leaf, &savehdr, 0,
+ drophdr.count);
+ } else {
+ xfs_attr3_leaf_moveents(state->args,
+ drop_leaf, &drophdr, 0,
+ save_leaf, &savehdr,
+ savehdr.count, drophdr.count);
+ }
+ } else {
+ /*
+ * Destination has holes, so we make a temporary copy
+ * of the leaf and add them both to that.
+ */
+ struct xfs_attr_leafblock *tmp_leaf;
+ struct xfs_attr3_icleaf_hdr tmphdr;
+
+ tmp_leaf = kmem_zalloc(state->args->geo->blksize, KM_SLEEP);
+
+ /*
+ * Copy the header into the temp leaf so that all the stuff
+ * not in the incore header is present and gets copied back in
+ * once we've moved all the entries.
+ */
+ memcpy(tmp_leaf, save_leaf, xfs_attr3_leaf_hdr_size(save_leaf));
+
+ memset(&tmphdr, 0, sizeof(tmphdr));
+ tmphdr.magic = savehdr.magic;
+ tmphdr.forw = savehdr.forw;
+ tmphdr.back = savehdr.back;
+ tmphdr.firstused = state->args->geo->blksize;
+
+ /* write the header to the temp buffer to initialise it */
+ xfs_attr3_leaf_hdr_to_disk(state->args->geo, tmp_leaf, &tmphdr);
+
+ if (xfs_attr3_leaf_order(save_blk->bp, &savehdr,
+ drop_blk->bp, &drophdr)) {
+ xfs_attr3_leaf_moveents(state->args,
+ drop_leaf, &drophdr, 0,
+ tmp_leaf, &tmphdr, 0,
+ drophdr.count);
+ xfs_attr3_leaf_moveents(state->args,
+ save_leaf, &savehdr, 0,
+ tmp_leaf, &tmphdr, tmphdr.count,
+ savehdr.count);
+ } else {
+ xfs_attr3_leaf_moveents(state->args,
+ save_leaf, &savehdr, 0,
+ tmp_leaf, &tmphdr, 0,
+ savehdr.count);
+ xfs_attr3_leaf_moveents(state->args,
+ drop_leaf, &drophdr, 0,
+ tmp_leaf, &tmphdr, tmphdr.count,
+ drophdr.count);
+ }
+ memcpy(save_leaf, tmp_leaf, state->args->geo->blksize);
+ savehdr = tmphdr; /* struct copy */
+ kmem_free(tmp_leaf);
+ }
+
+ xfs_attr3_leaf_hdr_to_disk(state->args->geo, save_leaf, &savehdr);
+ xfs_trans_log_buf(state->args->trans, save_blk->bp, 0,
+ state->args->geo->blksize - 1);
+
+ /*
+ * Copy out last hashval in each block for B-tree code.
+ */
+ entry = xfs_attr3_leaf_entryp(save_leaf);
+ save_blk->hashval = be32_to_cpu(entry[savehdr.count - 1].hashval);
+}
+
+/*========================================================================
+ * 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_attr3_leaf_lookup_int(
+ struct xfs_buf *bp,
+ struct xfs_da_args *args)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr3_icleaf_hdr ichdr;
+ struct xfs_attr_leaf_entry *entry;
+ struct xfs_attr_leaf_entry *entries;
+ struct xfs_attr_leaf_name_local *name_loc;
+ struct xfs_attr_leaf_name_remote *name_rmt;
+ xfs_dahash_t hashval;
+ int probe;
+ int span;
+
+ trace_xfs_attr_leaf_lookup(args);
+
+ leaf = bp->b_addr;
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
+ entries = xfs_attr3_leaf_entryp(leaf);
+ ASSERT(ichdr.count < args->geo->blksize / 8);
+
+ /*
+ * Binary search. (note: small blocks will skip this loop)
+ */
+ hashval = args->hashval;
+ probe = span = ichdr.count / 2;
+ for (entry = &entries[probe]; span > 4; entry = &entries[probe]) {
+ span /= 2;
+ if (be32_to_cpu(entry->hashval) < hashval)
+ probe += span;
+ else if (be32_to_cpu(entry->hashval) > hashval)
+ probe -= span;
+ else
+ break;
+ }
+ ASSERT(probe >= 0 && (!ichdr.count || probe < ichdr.count));
+ ASSERT(span <= 4 || be32_to_cpu(entry->hashval) == hashval);
+
+ /*
+ * Since we may have duplicate hashval's, find the first matching
+ * hashval in the leaf.
+ */
+ while (probe > 0 && be32_to_cpu(entry->hashval) >= hashval) {
+ entry--;
+ probe--;
+ }
+ while (probe < ichdr.count &&
+ be32_to_cpu(entry->hashval) < hashval) {
+ entry++;
+ probe++;
+ }
+ if (probe == ichdr.count || be32_to_cpu(entry->hashval) != hashval) {
+ args->index = probe;
+ return -ENOATTR;
+ }
+
+ /*
+ * Duplicate keys may be present, so search all of them for a match.
+ */
+ for (; probe < ichdr.count && (be32_to_cpu(entry->hashval) == 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_attr3_leaf_name_local(leaf, probe);
+ if (name_loc->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, name_loc->nameval,
+ args->namelen) != 0)
+ continue;
+ if (!xfs_attr_namesp_match(args->flags, entry->flags))
+ continue;
+ args->index = probe;
+ return -EEXIST;
+ } else {
+ name_rmt = xfs_attr3_leaf_name_remote(leaf, probe);
+ if (name_rmt->namelen != args->namelen)
+ continue;
+ if (memcmp(args->name, name_rmt->name,
+ args->namelen) != 0)
+ continue;
+ if (!xfs_attr_namesp_match(args->flags, entry->flags))
+ continue;
+ args->index = probe;
+ args->rmtvaluelen = be32_to_cpu(name_rmt->valuelen);
+ args->rmtblkno = be32_to_cpu(name_rmt->valueblk);
+ args->rmtblkcnt = xfs_attr3_rmt_blocks(
+ args->dp->i_mount,
+ args->rmtvaluelen);
+ return -EEXIST;
+ }
+ }
+ args->index = probe;
+ return -ENOATTR;
+}
+
+/*
+ * Get the value associated with an attribute name from a leaf attribute
+ * list structure.
+ */
+int
+xfs_attr3_leaf_getvalue(
+ struct xfs_buf *bp,
+ struct xfs_da_args *args)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr3_icleaf_hdr ichdr;
+ struct xfs_attr_leaf_entry *entry;
+ struct xfs_attr_leaf_name_local *name_loc;
+ struct xfs_attr_leaf_name_remote *name_rmt;
+ int valuelen;
+
+ leaf = bp->b_addr;
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
+ ASSERT(ichdr.count < args->geo->blksize / 8);
+ ASSERT(args->index < ichdr.count);
+
+ entry = &xfs_attr3_leaf_entryp(leaf)[args->index];
+ if (entry->flags & XFS_ATTR_LOCAL) {
+ name_loc = xfs_attr3_leaf_name_local(leaf, args->index);
+ ASSERT(name_loc->namelen == args->namelen);
+ ASSERT(memcmp(args->name, name_loc->nameval, args->namelen) == 0);
+ valuelen = be16_to_cpu(name_loc->valuelen);
+ if (args->flags & ATTR_KERNOVAL) {
+ args->valuelen = valuelen;
+ return 0;
+ }
+ if (args->valuelen < valuelen) {
+ args->valuelen = valuelen;
+ return -ERANGE;
+ }
+ args->valuelen = valuelen;
+ memcpy(args->value, &name_loc->nameval[args->namelen], valuelen);
+ } else {
+ name_rmt = xfs_attr3_leaf_name_remote(leaf, args->index);
+ ASSERT(name_rmt->namelen == args->namelen);
+ ASSERT(memcmp(args->name, name_rmt->name, args->namelen) == 0);
+ args->rmtvaluelen = be32_to_cpu(name_rmt->valuelen);
+ args->rmtblkno = be32_to_cpu(name_rmt->valueblk);
+ args->rmtblkcnt = xfs_attr3_rmt_blocks(args->dp->i_mount,
+ args->rmtvaluelen);
+ if (args->flags & ATTR_KERNOVAL) {
+ args->valuelen = args->rmtvaluelen;
+ return 0;
+ }
+ if (args->valuelen < args->rmtvaluelen) {
+ args->valuelen = args->rmtvaluelen;
+ return -ERANGE;
+ }
+ args->valuelen = args->rmtvaluelen;
+ }
+ 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_attr3_leaf_moveents(
+ struct xfs_da_args *args,
+ struct xfs_attr_leafblock *leaf_s,
+ struct xfs_attr3_icleaf_hdr *ichdr_s,
+ int start_s,
+ struct xfs_attr_leafblock *leaf_d,
+ struct xfs_attr3_icleaf_hdr *ichdr_d,
+ int start_d,
+ int count)
+{
+ struct xfs_attr_leaf_entry *entry_s;
+ struct xfs_attr_leaf_entry *entry_d;
+ int desti;
+ int tmp;
+ int i;
+
+ /*
+ * Check for nothing to do.
+ */
+ if (count == 0)
+ return;
+
+ /*
+ * Set up environment.
+ */
+ ASSERT(ichdr_s->magic == XFS_ATTR_LEAF_MAGIC ||
+ ichdr_s->magic == XFS_ATTR3_LEAF_MAGIC);
+ ASSERT(ichdr_s->magic == ichdr_d->magic);
+ ASSERT(ichdr_s->count > 0 && ichdr_s->count < args->geo->blksize / 8);
+ ASSERT(ichdr_s->firstused >= (ichdr_s->count * sizeof(*entry_s))
+ + xfs_attr3_leaf_hdr_size(leaf_s));
+ ASSERT(ichdr_d->count < args->geo->blksize / 8);
+ ASSERT(ichdr_d->firstused >= (ichdr_d->count * sizeof(*entry_d))
+ + xfs_attr3_leaf_hdr_size(leaf_d));
+
+ ASSERT(start_s < ichdr_s->count);
+ ASSERT(start_d <= ichdr_d->count);
+ ASSERT(count <= ichdr_s->count);
+
+
+ /*
+ * Move the entries in the destination leaf up to make a hole?
+ */
+ if (start_d < ichdr_d->count) {
+ tmp = ichdr_d->count - start_d;
+ tmp *= sizeof(xfs_attr_leaf_entry_t);
+ entry_s = &xfs_attr3_leaf_entryp(leaf_d)[start_d];
+ entry_d = &xfs_attr3_leaf_entryp(leaf_d)[start_d + count];
+ memmove(entry_d, entry_s, tmp);
+ }
+
+ /*
+ * Copy all entry's in the same (sorted) order,
+ * but allocate attribute info packed and in sequence.
+ */
+ entry_s = &xfs_attr3_leaf_entryp(leaf_s)[start_s];
+ entry_d = &xfs_attr3_leaf_entryp(leaf_d)[start_d];
+ desti = start_d;
+ for (i = 0; i < count; entry_s++, entry_d++, desti++, i++) {
+ ASSERT(be16_to_cpu(entry_s->nameidx) >= ichdr_s->firstused);
+ 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_attr3_leaf_name(leaf_s, start_s + i), 0, tmp);
+ ichdr_s->usedbytes -= tmp;
+ ichdr_s->count -= 1;
+ entry_d--; /* to compensate for ++ in loop hdr */
+ desti--;
+ if ((start_s + i) < offset)
+ result++; /* insertion index adjustment */
+ } else {
+#endif /* GROT */
+ ichdr_d->firstused -= tmp;
+ /* both on-disk, don't endian flip twice */
+ entry_d->hashval = entry_s->hashval;
+ entry_d->nameidx = cpu_to_be16(ichdr_d->firstused);
+ entry_d->flags = entry_s->flags;
+ ASSERT(be16_to_cpu(entry_d->nameidx) + tmp
+ <= args->geo->blksize);
+ memmove(xfs_attr3_leaf_name(leaf_d, desti),
+ xfs_attr3_leaf_name(leaf_s, start_s + i), tmp);
+ ASSERT(be16_to_cpu(entry_s->nameidx) + tmp
+ <= args->geo->blksize);
+ memset(xfs_attr3_leaf_name(leaf_s, start_s + i), 0, tmp);
+ ichdr_s->usedbytes -= tmp;
+ ichdr_d->usedbytes += tmp;
+ ichdr_s->count -= 1;
+ ichdr_d->count += 1;
+ tmp = ichdr_d->count * sizeof(xfs_attr_leaf_entry_t)
+ + xfs_attr3_leaf_hdr_size(leaf_d);
+ ASSERT(ichdr_d->firstused >= tmp);
+#ifdef GROT
+ }
+#endif /* GROT */
+ }
+
+ /*
+ * Zero out the entries we just copied.
+ */
+ if (start_s == ichdr_s->count) {
+ tmp = count * sizeof(xfs_attr_leaf_entry_t);
+ entry_s = &xfs_attr3_leaf_entryp(leaf_s)[start_s];
+ ASSERT(((char *)entry_s + tmp) <=
+ ((char *)leaf_s + args->geo->blksize));
+ memset(entry_s, 0, tmp);
+ } else {
+ /*
+ * Move the remaining entries down to fill the hole,
+ * then zero the entries at the top.
+ */
+ tmp = (ichdr_s->count - count) * sizeof(xfs_attr_leaf_entry_t);
+ entry_s = &xfs_attr3_leaf_entryp(leaf_s)[start_s + count];
+ entry_d = &xfs_attr3_leaf_entryp(leaf_s)[start_s];
+ memmove(entry_d, entry_s, tmp);
+
+ tmp = count * sizeof(xfs_attr_leaf_entry_t);
+ entry_s = &xfs_attr3_leaf_entryp(leaf_s)[ichdr_s->count];
+ ASSERT(((char *)entry_s + tmp) <=
+ ((char *)leaf_s + args->geo->blksize));
+ memset(entry_s, 0, tmp);
+ }
+
+ /*
+ * Fill in the freemap information
+ */
+ ichdr_d->freemap[0].base = xfs_attr3_leaf_hdr_size(leaf_d);
+ ichdr_d->freemap[0].base += ichdr_d->count * sizeof(xfs_attr_leaf_entry_t);
+ ichdr_d->freemap[0].size = ichdr_d->firstused - ichdr_d->freemap[0].base;
+ ichdr_d->freemap[1].base = 0;
+ ichdr_d->freemap[2].base = 0;
+ ichdr_d->freemap[1].size = 0;
+ ichdr_d->freemap[2].size = 0;
+ ichdr_s->holes = 1; /* leaf may not be compact */
+}
+
+/*
+ * Pick up the last hashvalue from a leaf block.
+ */
+xfs_dahash_t
+xfs_attr_leaf_lasthash(
+ struct xfs_buf *bp,
+ int *count)
+{
+ struct xfs_attr3_icleaf_hdr ichdr;
+ struct xfs_attr_leaf_entry *entries;
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+
+ xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, bp->b_addr);
+ entries = xfs_attr3_leaf_entryp(bp->b_addr);
+ if (count)
+ *count = ichdr.count;
+ if (!ichdr.count)
+ return 0;
+ return be32_to_cpu(entries[ichdr.count - 1].hashval);
+}
+
+/*
+ * Calculate the number of bytes used to store the indicated attribute
+ * (whether local or remote only calculate bytes in this block).
+ */
+STATIC int
+xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index)
+{
+ struct xfs_attr_leaf_entry *entries;
+ xfs_attr_leaf_name_local_t *name_loc;
+ xfs_attr_leaf_name_remote_t *name_rmt;
+ int size;
+
+ entries = xfs_attr3_leaf_entryp(leaf);
+ if (entries[index].flags & XFS_ATTR_LOCAL) {
+ name_loc = xfs_attr3_leaf_name_local(leaf, index);
+ size = xfs_attr_leaf_entsize_local(name_loc->namelen,
+ be16_to_cpu(name_loc->valuelen));
+ } else {
+ name_rmt = xfs_attr3_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(
+ struct xfs_da_args *args,
+ int *local)
+{
+ int size;
+
+ size = xfs_attr_leaf_entsize_local(args->namelen, args->valuelen);
+ if (size < xfs_attr_leaf_entsize_local_max(args->geo->blksize)) {
+ if (local)
+ *local = 1;
+ return size;
+ }
+ if (local)
+ *local = 0;
+ return xfs_attr_leaf_entsize_remote(args->namelen);
+}
+
+
+/*========================================================================
+ * Manage the INCOMPLETE flag in a leaf entry
+ *========================================================================*/
+
+/*
+ * Clear the INCOMPLETE flag on an entry in a leaf block.
+ */
+int
+xfs_attr3_leaf_clearflag(
+ struct xfs_da_args *args)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr_leaf_entry *entry;
+ struct xfs_attr_leaf_name_remote *name_rmt;
+ struct xfs_buf *bp;
+ int error;
+#ifdef DEBUG
+ struct xfs_attr3_icleaf_hdr ichdr;
+ xfs_attr_leaf_name_local_t *name_loc;
+ int namelen;
+ char *name;
+#endif /* DEBUG */
+
+ trace_xfs_attr_leaf_clearflag(args);
+ /*
+ * Set up the operation.
+ */
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
+ if (error)
+ return error;
+
+ leaf = bp->b_addr;
+ entry = &xfs_attr3_leaf_entryp(leaf)[args->index];
+ ASSERT(entry->flags & XFS_ATTR_INCOMPLETE);
+
+#ifdef DEBUG
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
+ ASSERT(args->index < ichdr.count);
+ ASSERT(args->index >= 0);
+
+ if (entry->flags & XFS_ATTR_LOCAL) {
+ name_loc = xfs_attr3_leaf_name_local(leaf, args->index);
+ namelen = name_loc->namelen;
+ name = (char *)name_loc->nameval;
+ } else {
+ name_rmt = xfs_attr3_leaf_name_remote(leaf, args->index);
+ namelen = name_rmt->namelen;
+ name = (char *)name_rmt->name;
+ }
+ ASSERT(be32_to_cpu(entry->hashval) == args->hashval);
+ ASSERT(namelen == args->namelen);
+ ASSERT(memcmp(name, args->name, namelen) == 0);
+#endif /* DEBUG */
+
+ entry->flags &= ~XFS_ATTR_INCOMPLETE;
+ xfs_trans_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_attr3_leaf_name_remote(leaf, args->index);
+ name_rmt->valueblk = cpu_to_be32(args->rmtblkno);
+ name_rmt->valuelen = cpu_to_be32(args->rmtvaluelen);
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
+ }
+
+ /*
+ * Commit the flag value change and start the next trans in series.
+ */
+ return xfs_trans_roll(&args->trans, args->dp);
+}
+
+/*
+ * Set the INCOMPLETE flag on an entry in a leaf block.
+ */
+int
+xfs_attr3_leaf_setflag(
+ struct xfs_da_args *args)
+{
+ struct xfs_attr_leafblock *leaf;
+ struct xfs_attr_leaf_entry *entry;
+ struct xfs_attr_leaf_name_remote *name_rmt;
+ struct xfs_buf *bp;
+ int error;
+#ifdef DEBUG
+ struct xfs_attr3_icleaf_hdr ichdr;
+#endif
+
+ trace_xfs_attr_leaf_setflag(args);
+
+ /*
+ * Set up the operation.
+ */
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
+ if (error)
+ return error;
+
+ leaf = bp->b_addr;
+#ifdef DEBUG
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr, leaf);
+ ASSERT(args->index < ichdr.count);
+ ASSERT(args->index >= 0);
+#endif
+ entry = &xfs_attr3_leaf_entryp(leaf)[args->index];
+
+ ASSERT((entry->flags & XFS_ATTR_INCOMPLETE) == 0);
+ entry->flags |= XFS_ATTR_INCOMPLETE;
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
+ if ((entry->flags & XFS_ATTR_LOCAL) == 0) {
+ name_rmt = xfs_attr3_leaf_name_remote(leaf, args->index);
+ name_rmt->valueblk = 0;
+ name_rmt->valuelen = 0;
+ xfs_trans_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
+ }
+
+ /*
+ * Commit the flag value change and start the next trans in series.
+ */
+ return xfs_trans_roll(&args->trans, args->dp);
+}
+
+/*
+ * 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_attr3_leaf_flipflags(
+ struct xfs_da_args *args)
+{
+ struct xfs_attr_leafblock *leaf1;
+ struct xfs_attr_leafblock *leaf2;
+ struct xfs_attr_leaf_entry *entry1;
+ struct xfs_attr_leaf_entry *entry2;
+ struct xfs_attr_leaf_name_remote *name_rmt;
+ struct xfs_buf *bp1;
+ struct xfs_buf *bp2;
+ int error;
+#ifdef DEBUG
+ struct xfs_attr3_icleaf_hdr ichdr1;
+ struct xfs_attr3_icleaf_hdr ichdr2;
+ xfs_attr_leaf_name_local_t *name_loc;
+ int namelen1, namelen2;
+ char *name1, *name2;
+#endif /* DEBUG */
+
+ trace_xfs_attr_leaf_flipflags(args);
+
+ /*
+ * Read the block containing the "old" attr
+ */
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp1);
+ if (error)
+ return error;
+
+ /*
+ * Read the block containing the "new" attr, if it is different
+ */
+ if (args->blkno2 != args->blkno) {
+ error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno2,
+ -1, &bp2);
+ if (error)
+ return error;
+ } else {
+ bp2 = bp1;
+ }
+
+ leaf1 = bp1->b_addr;
+ entry1 = &xfs_attr3_leaf_entryp(leaf1)[args->index];
+
+ leaf2 = bp2->b_addr;
+ entry2 = &xfs_attr3_leaf_entryp(leaf2)[args->index2];
+
+#ifdef DEBUG
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr1, leaf1);
+ ASSERT(args->index < ichdr1.count);
+ ASSERT(args->index >= 0);
+
+ xfs_attr3_leaf_hdr_from_disk(args->geo, &ichdr2, leaf2);
+ ASSERT(args->index2 < ichdr2.count);
+ ASSERT(args->index2 >= 0);
+
+ if (entry1->flags & XFS_ATTR_LOCAL) {
+ name_loc = xfs_attr3_leaf_name_local(leaf1, args->index);
+ namelen1 = name_loc->namelen;
+ name1 = (char *)name_loc->nameval;
+ } else {
+ name_rmt = xfs_attr3_leaf_name_remote(leaf1, args->index);
+ namelen1 = name_rmt->namelen;
+ name1 = (char *)name_rmt->name;
+ }
+ if (entry2->flags & XFS_ATTR_LOCAL) {
+ name_loc = xfs_attr3_leaf_name_local(leaf2, args->index2);
+ namelen2 = name_loc->namelen;
+ name2 = (char *)name_loc->nameval;
+ } else {
+ name_rmt = xfs_attr3_leaf_name_remote(leaf2, args->index2);
+ namelen2 = name_rmt->namelen;
+ name2 = (char *)name_rmt->name;
+ }
+ ASSERT(be32_to_cpu(entry1->hashval) == be32_to_cpu(entry2->hashval));
+ 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_trans_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_attr3_leaf_name_remote(leaf1, args->index);
+ name_rmt->valueblk = cpu_to_be32(args->rmtblkno);
+ name_rmt->valuelen = cpu_to_be32(args->rmtvaluelen);
+ xfs_trans_log_buf(args->trans, bp1,
+ XFS_DA_LOGRANGE(leaf1, name_rmt, sizeof(*name_rmt)));
+ }
+
+ entry2->flags |= XFS_ATTR_INCOMPLETE;
+ xfs_trans_log_buf(args->trans, bp2,
+ XFS_DA_LOGRANGE(leaf2, entry2, sizeof(*entry2)));
+ if ((entry2->flags & XFS_ATTR_LOCAL) == 0) {
+ name_rmt = xfs_attr3_leaf_name_remote(leaf2, args->index2);
+ name_rmt->valueblk = 0;
+ name_rmt->valuelen = 0;
+ xfs_trans_log_buf(args->trans, bp2,
+ XFS_DA_LOGRANGE(leaf2, name_rmt, sizeof(*name_rmt)));
+ }
+
+ /*
+ * Commit the flag value change and start the next trans in series.
+ */
+ error = xfs_trans_roll(&args->trans, args->dp);
+
+ return error;
+}
Code Review / kvmfornfv.git / blobdiff