--- /dev/null
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * Copyright (c) 2013 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_dir2.h"
+#include "xfs_dir2_priv.h"
+#include "xfs_error.h"
+#include "xfs_trace.h"
+#include "xfs_trans.h"
+#include "xfs_buf_item.h"
+#include "xfs_cksum.h"
+
+/*
+ * Local function declarations.
+ */
+static int xfs_dir2_leaf_lookup_int(xfs_da_args_t *args, struct xfs_buf **lbpp,
+ int *indexp, struct xfs_buf **dbpp);
+static void xfs_dir3_leaf_log_bests(struct xfs_da_args *args,
+ struct xfs_buf *bp, int first, int last);
+static void xfs_dir3_leaf_log_tail(struct xfs_da_args *args,
+ struct xfs_buf *bp);
+
+/*
+ * Check the internal consistency of a leaf1 block.
+ * Pop an assert if something is wrong.
+ */
+#ifdef DEBUG
+#define xfs_dir3_leaf_check(dp, bp) \
+do { \
+ if (!xfs_dir3_leaf1_check((dp), (bp))) \
+ ASSERT(0); \
+} while (0);
+
+STATIC bool
+xfs_dir3_leaf1_check(
+ struct xfs_inode *dp,
+ struct xfs_buf *bp)
+{
+ struct xfs_dir2_leaf *leaf = bp->b_addr;
+ struct xfs_dir3_icleaf_hdr leafhdr;
+
+ dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
+
+ if (leafhdr.magic == XFS_DIR3_LEAF1_MAGIC) {
+ struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
+ if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
+ return false;
+ } else if (leafhdr.magic != XFS_DIR2_LEAF1_MAGIC)
+ return false;
+
+ return xfs_dir3_leaf_check_int(dp->i_mount, dp, &leafhdr, leaf);
+}
+#else
+#define xfs_dir3_leaf_check(dp, bp)
+#endif
+
+bool
+xfs_dir3_leaf_check_int(
+ struct xfs_mount *mp,
+ struct xfs_inode *dp,
+ struct xfs_dir3_icleaf_hdr *hdr,
+ struct xfs_dir2_leaf *leaf)
+{
+ struct xfs_dir2_leaf_entry *ents;
+ xfs_dir2_leaf_tail_t *ltp;
+ int stale;
+ int i;
+ const struct xfs_dir_ops *ops;
+ struct xfs_dir3_icleaf_hdr leafhdr;
+ struct xfs_da_geometry *geo = mp->m_dir_geo;
+
+ /*
+ * we can be passed a null dp here from a verifier, so we need to go the
+ * hard way to get them.
+ */
+ ops = xfs_dir_get_ops(mp, dp);
+
+ if (!hdr) {
+ ops->leaf_hdr_from_disk(&leafhdr, leaf);
+ hdr = &leafhdr;
+ }
+
+ ents = ops->leaf_ents_p(leaf);
+ ltp = xfs_dir2_leaf_tail_p(geo, leaf);
+
+ /*
+ * XXX (dgc): This value is not restrictive enough.
+ * Should factor in the size of the bests table as well.
+ * We can deduce a value for that from di_size.
+ */
+ if (hdr->count > ops->leaf_max_ents(geo))
+ return false;
+
+ /* Leaves and bests don't overlap in leaf format. */
+ if ((hdr->magic == XFS_DIR2_LEAF1_MAGIC ||
+ hdr->magic == XFS_DIR3_LEAF1_MAGIC) &&
+ (char *)&ents[hdr->count] > (char *)xfs_dir2_leaf_bests_p(ltp))
+ return false;
+
+ /* Check hash value order, count stale entries. */
+ for (i = stale = 0; i < hdr->count; i++) {
+ if (i + 1 < hdr->count) {
+ if (be32_to_cpu(ents[i].hashval) >
+ be32_to_cpu(ents[i + 1].hashval))
+ return false;
+ }
+ if (ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
+ stale++;
+ }
+ if (hdr->stale != stale)
+ return false;
+ return true;
+}
+
+/*
+ * We verify the magic numbers before decoding the leaf header so that on debug
+ * kernels we don't get assertion failures in xfs_dir3_leaf_hdr_from_disk() due
+ * to incorrect magic numbers.
+ */
+static bool
+xfs_dir3_leaf_verify(
+ struct xfs_buf *bp,
+ __uint16_t magic)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+ struct xfs_dir2_leaf *leaf = bp->b_addr;
+
+ ASSERT(magic == XFS_DIR2_LEAF1_MAGIC || magic == XFS_DIR2_LEAFN_MAGIC);
+
+ if (xfs_sb_version_hascrc(&mp->m_sb)) {
+ struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
+ __uint16_t magic3;
+
+ magic3 = (magic == XFS_DIR2_LEAF1_MAGIC) ? XFS_DIR3_LEAF1_MAGIC
+ : XFS_DIR3_LEAFN_MAGIC;
+
+ if (leaf3->info.hdr.magic != cpu_to_be16(magic3))
+ return false;
+ if (!uuid_equal(&leaf3->info.uuid, &mp->m_sb.sb_uuid))
+ return false;
+ if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
+ return false;
+ } else {
+ if (leaf->hdr.info.magic != cpu_to_be16(magic))
+ return false;
+ }
+
+ return xfs_dir3_leaf_check_int(mp, NULL, NULL, leaf);
+}
+
+static void
+__read_verify(
+ struct xfs_buf *bp,
+ __uint16_t magic)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+
+ if (xfs_sb_version_hascrc(&mp->m_sb) &&
+ !xfs_buf_verify_cksum(bp, XFS_DIR3_LEAF_CRC_OFF))
+ xfs_buf_ioerror(bp, -EFSBADCRC);
+ else if (!xfs_dir3_leaf_verify(bp, magic))
+ xfs_buf_ioerror(bp, -EFSCORRUPTED);
+
+ if (bp->b_error)
+ xfs_verifier_error(bp);
+}
+
+static void
+__write_verify(
+ struct xfs_buf *bp,
+ __uint16_t magic)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+ struct xfs_buf_log_item *bip = bp->b_fspriv;
+ struct xfs_dir3_leaf_hdr *hdr3 = bp->b_addr;
+
+ if (!xfs_dir3_leaf_verify(bp, magic)) {
+ 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_DIR3_LEAF_CRC_OFF);
+}
+
+static void
+xfs_dir3_leaf1_read_verify(
+ struct xfs_buf *bp)
+{
+ __read_verify(bp, XFS_DIR2_LEAF1_MAGIC);
+}
+
+static void
+xfs_dir3_leaf1_write_verify(
+ struct xfs_buf *bp)
+{
+ __write_verify(bp, XFS_DIR2_LEAF1_MAGIC);
+}
+
+static void
+xfs_dir3_leafn_read_verify(
+ struct xfs_buf *bp)
+{
+ __read_verify(bp, XFS_DIR2_LEAFN_MAGIC);
+}
+
+static void
+xfs_dir3_leafn_write_verify(
+ struct xfs_buf *bp)
+{
+ __write_verify(bp, XFS_DIR2_LEAFN_MAGIC);
+}
+
+const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops = {
+ .verify_read = xfs_dir3_leaf1_read_verify,
+ .verify_write = xfs_dir3_leaf1_write_verify,
+};
+
+const struct xfs_buf_ops xfs_dir3_leafn_buf_ops = {
+ .verify_read = xfs_dir3_leafn_read_verify,
+ .verify_write = xfs_dir3_leafn_write_verify,
+};
+
+static int
+xfs_dir3_leaf_read(
+ struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ xfs_dablk_t fbno,
+ xfs_daddr_t mappedbno,
+ struct xfs_buf **bpp)
+{
+ int err;
+
+ err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
+ XFS_DATA_FORK, &xfs_dir3_leaf1_buf_ops);
+ if (!err && tp)
+ xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_LEAF1_BUF);
+ return err;
+}
+
+int
+xfs_dir3_leafn_read(
+ struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ xfs_dablk_t fbno,
+ xfs_daddr_t mappedbno,
+ struct xfs_buf **bpp)
+{
+ int err;
+
+ err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
+ XFS_DATA_FORK, &xfs_dir3_leafn_buf_ops);
+ if (!err && tp)
+ xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_LEAFN_BUF);
+ return err;
+}
+
+/*
+ * Initialize a new leaf block, leaf1 or leafn magic accepted.
+ */
+static void
+xfs_dir3_leaf_init(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_buf *bp,
+ xfs_ino_t owner,
+ __uint16_t type)
+{
+ struct xfs_dir2_leaf *leaf = bp->b_addr;
+
+ ASSERT(type == XFS_DIR2_LEAF1_MAGIC || type == XFS_DIR2_LEAFN_MAGIC);
+
+ if (xfs_sb_version_hascrc(&mp->m_sb)) {
+ struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
+
+ memset(leaf3, 0, sizeof(*leaf3));
+
+ leaf3->info.hdr.magic = (type == XFS_DIR2_LEAF1_MAGIC)
+ ? cpu_to_be16(XFS_DIR3_LEAF1_MAGIC)
+ : cpu_to_be16(XFS_DIR3_LEAFN_MAGIC);
+ leaf3->info.blkno = cpu_to_be64(bp->b_bn);
+ leaf3->info.owner = cpu_to_be64(owner);
+ uuid_copy(&leaf3->info.uuid, &mp->m_sb.sb_uuid);
+ } else {
+ memset(leaf, 0, sizeof(*leaf));
+ leaf->hdr.info.magic = cpu_to_be16(type);
+ }
+
+ /*
+ * If it's a leaf-format directory initialize the tail.
+ * Caller is responsible for initialising the bests table.
+ */
+ if (type == XFS_DIR2_LEAF1_MAGIC) {
+ struct xfs_dir2_leaf_tail *ltp;
+
+ ltp = xfs_dir2_leaf_tail_p(mp->m_dir_geo, leaf);
+ ltp->bestcount = 0;
+ bp->b_ops = &xfs_dir3_leaf1_buf_ops;
+ xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAF1_BUF);
+ } else {
+ bp->b_ops = &xfs_dir3_leafn_buf_ops;
+ xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAFN_BUF);
+ }
+}
+
+int
+xfs_dir3_leaf_get_buf(
+ xfs_da_args_t *args,
+ xfs_dir2_db_t bno,
+ struct xfs_buf **bpp,
+ __uint16_t magic)
+{
+ struct xfs_inode *dp = args->dp;
+ struct xfs_trans *tp = args->trans;
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_buf *bp;
+ int error;
+
+ ASSERT(magic == XFS_DIR2_LEAF1_MAGIC || magic == XFS_DIR2_LEAFN_MAGIC);
+ ASSERT(bno >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET) &&
+ bno < xfs_dir2_byte_to_db(args->geo, XFS_DIR2_FREE_OFFSET));
+
+ error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, bno),
+ -1, &bp, XFS_DATA_FORK);
+ if (error)
+ return error;
+
+ xfs_dir3_leaf_init(mp, tp, bp, dp->i_ino, magic);
+ xfs_dir3_leaf_log_header(args, bp);
+ if (magic == XFS_DIR2_LEAF1_MAGIC)
+ xfs_dir3_leaf_log_tail(args, bp);
+ *bpp = bp;
+ return 0;
+}
+
+/*
+ * Convert a block form directory to a leaf form directory.
+ */
+int /* error */
+xfs_dir2_block_to_leaf(
+ xfs_da_args_t *args, /* operation arguments */
+ struct xfs_buf *dbp) /* input block's buffer */
+{
+ __be16 *bestsp; /* leaf's bestsp entries */
+ xfs_dablk_t blkno; /* leaf block's bno */
+ xfs_dir2_data_hdr_t *hdr; /* block header */
+ xfs_dir2_leaf_entry_t *blp; /* block's leaf entries */
+ xfs_dir2_block_tail_t *btp; /* block's tail */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ struct xfs_buf *lbp; /* leaf block's buffer */
+ xfs_dir2_db_t ldb; /* leaf block's bno */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf's tail */
+ int needlog; /* need to log block header */
+ int needscan; /* need to rescan bestfree */
+ xfs_trans_t *tp; /* transaction pointer */
+ struct xfs_dir2_data_free *bf;
+ struct xfs_dir2_leaf_entry *ents;
+ struct xfs_dir3_icleaf_hdr leafhdr;
+
+ trace_xfs_dir2_block_to_leaf(args);
+
+ dp = args->dp;
+ tp = args->trans;
+ /*
+ * Add the leaf block to the inode.
+ * This interface will only put blocks in the leaf/node range.
+ * Since that's empty now, we'll get the root (block 0 in range).
+ */
+ if ((error = xfs_da_grow_inode(args, &blkno))) {
+ return error;
+ }
+ ldb = xfs_dir2_da_to_db(args->geo, blkno);
+ ASSERT(ldb == xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET));
+ /*
+ * Initialize the leaf block, get a buffer for it.
+ */
+ error = xfs_dir3_leaf_get_buf(args, ldb, &lbp, XFS_DIR2_LEAF1_MAGIC);
+ if (error)
+ return error;
+
+ leaf = lbp->b_addr;
+ hdr = dbp->b_addr;
+ xfs_dir3_data_check(dp, dbp);
+ btp = xfs_dir2_block_tail_p(args->geo, hdr);
+ blp = xfs_dir2_block_leaf_p(btp);
+ bf = dp->d_ops->data_bestfree_p(hdr);
+ ents = dp->d_ops->leaf_ents_p(leaf);
+
+ /*
+ * Set the counts in the leaf header.
+ */
+ dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
+ leafhdr.count = be32_to_cpu(btp->count);
+ leafhdr.stale = be32_to_cpu(btp->stale);
+ dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
+ xfs_dir3_leaf_log_header(args, lbp);
+
+ /*
+ * Could compact these but I think we always do the conversion
+ * after squeezing out stale entries.
+ */
+ memcpy(ents, blp, be32_to_cpu(btp->count) * sizeof(xfs_dir2_leaf_entry_t));
+ xfs_dir3_leaf_log_ents(args, lbp, 0, leafhdr.count - 1);
+ needscan = 0;
+ needlog = 1;
+ /*
+ * Make the space formerly occupied by the leaf entries and block
+ * tail be free.
+ */
+ xfs_dir2_data_make_free(args, dbp,
+ (xfs_dir2_data_aoff_t)((char *)blp - (char *)hdr),
+ (xfs_dir2_data_aoff_t)((char *)hdr + args->geo->blksize -
+ (char *)blp),
+ &needlog, &needscan);
+ /*
+ * Fix up the block header, make it a data block.
+ */
+ dbp->b_ops = &xfs_dir3_data_buf_ops;
+ xfs_trans_buf_set_type(tp, dbp, XFS_BLFT_DIR_DATA_BUF);
+ if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC))
+ hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
+ else
+ hdr->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC);
+
+ if (needscan)
+ xfs_dir2_data_freescan(dp, hdr, &needlog);
+ /*
+ * Set up leaf tail and bests table.
+ */
+ ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
+ ltp->bestcount = cpu_to_be32(1);
+ bestsp = xfs_dir2_leaf_bests_p(ltp);
+ bestsp[0] = bf[0].length;
+ /*
+ * Log the data header and leaf bests table.
+ */
+ if (needlog)
+ xfs_dir2_data_log_header(args, dbp);
+ xfs_dir3_leaf_check(dp, lbp);
+ xfs_dir3_data_check(dp, dbp);
+ xfs_dir3_leaf_log_bests(args, lbp, 0, 0);
+ return 0;
+}
+
+STATIC void
+xfs_dir3_leaf_find_stale(
+ struct xfs_dir3_icleaf_hdr *leafhdr,
+ struct xfs_dir2_leaf_entry *ents,
+ int index,
+ int *lowstale,
+ int *highstale)
+{
+ /*
+ * Find the first stale entry before our index, if any.
+ */
+ for (*lowstale = index - 1; *lowstale >= 0; --*lowstale) {
+ if (ents[*lowstale].address ==
+ cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
+ break;
+ }
+
+ /*
+ * Find the first stale entry at or after our index, if any.
+ * Stop if the result would require moving more entries than using
+ * lowstale.
+ */
+ for (*highstale = index; *highstale < leafhdr->count; ++*highstale) {
+ if (ents[*highstale].address ==
+ cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
+ break;
+ if (*lowstale >= 0 && index - *lowstale <= *highstale - index)
+ break;
+ }
+}
+
+struct xfs_dir2_leaf_entry *
+xfs_dir3_leaf_find_entry(
+ struct xfs_dir3_icleaf_hdr *leafhdr,
+ struct xfs_dir2_leaf_entry *ents,
+ int index, /* leaf table position */
+ int compact, /* need to compact leaves */
+ int lowstale, /* index of prev stale leaf */
+ int highstale, /* index of next stale leaf */
+ int *lfloglow, /* low leaf logging index */
+ int *lfloghigh) /* high leaf logging index */
+{
+ if (!leafhdr->stale) {
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */
+
+ /*
+ * Now we need to make room to insert the leaf entry.
+ *
+ * If there are no stale entries, just insert a hole at index.
+ */
+ lep = &ents[index];
+ if (index < leafhdr->count)
+ memmove(lep + 1, lep,
+ (leafhdr->count - index) * sizeof(*lep));
+
+ /*
+ * Record low and high logging indices for the leaf.
+ */
+ *lfloglow = index;
+ *lfloghigh = leafhdr->count++;
+ return lep;
+ }
+
+ /*
+ * There are stale entries.
+ *
+ * We will use one of them for the new entry. It's probably not at
+ * the right location, so we'll have to shift some up or down first.
+ *
+ * If we didn't compact before, we need to find the nearest stale
+ * entries before and after our insertion point.
+ */
+ if (compact == 0)
+ xfs_dir3_leaf_find_stale(leafhdr, ents, index,
+ &lowstale, &highstale);
+
+ /*
+ * If the low one is better, use it.
+ */
+ if (lowstale >= 0 &&
+ (highstale == leafhdr->count ||
+ index - lowstale - 1 < highstale - index)) {
+ ASSERT(index - lowstale - 1 >= 0);
+ ASSERT(ents[lowstale].address ==
+ cpu_to_be32(XFS_DIR2_NULL_DATAPTR));
+
+ /*
+ * Copy entries up to cover the stale entry and make room
+ * for the new entry.
+ */
+ if (index - lowstale - 1 > 0) {
+ memmove(&ents[lowstale], &ents[lowstale + 1],
+ (index - lowstale - 1) *
+ sizeof(xfs_dir2_leaf_entry_t));
+ }
+ *lfloglow = MIN(lowstale, *lfloglow);
+ *lfloghigh = MAX(index - 1, *lfloghigh);
+ leafhdr->stale--;
+ return &ents[index - 1];
+ }
+
+ /*
+ * The high one is better, so use that one.
+ */
+ ASSERT(highstale - index >= 0);
+ ASSERT(ents[highstale].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR));
+
+ /*
+ * Copy entries down to cover the stale entry and make room for the
+ * new entry.
+ */
+ if (highstale - index > 0) {
+ memmove(&ents[index + 1], &ents[index],
+ (highstale - index) * sizeof(xfs_dir2_leaf_entry_t));
+ }
+ *lfloglow = MIN(index, *lfloglow);
+ *lfloghigh = MAX(highstale, *lfloghigh);
+ leafhdr->stale--;
+ return &ents[index];
+}
+
+/*
+ * Add an entry to a leaf form directory.
+ */
+int /* error */
+xfs_dir2_leaf_addname(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ __be16 *bestsp; /* freespace table in leaf */
+ int compact; /* need to compact leaves */
+ xfs_dir2_data_hdr_t *hdr; /* data block header */
+ struct xfs_buf *dbp; /* data block buffer */
+ xfs_dir2_data_entry_t *dep; /* data block entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ xfs_dir2_data_unused_t *dup; /* data unused entry */
+ int error; /* error return value */
+ int grown; /* allocated new data block */
+ int highstale; /* index of next stale leaf */
+ int i; /* temporary, index */
+ int index; /* leaf table position */
+ struct xfs_buf *lbp; /* leaf's buffer */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ int length; /* length of new entry */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */
+ int lfloglow; /* low leaf logging index */
+ int lfloghigh; /* high leaf logging index */
+ int lowstale; /* index of prev stale leaf */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */
+ int needbytes; /* leaf block bytes needed */
+ int needlog; /* need to log data header */
+ int needscan; /* need to rescan data free */
+ __be16 *tagp; /* end of data entry */
+ xfs_trans_t *tp; /* transaction pointer */
+ xfs_dir2_db_t use_block; /* data block number */
+ struct xfs_dir2_data_free *bf; /* bestfree table */
+ struct xfs_dir2_leaf_entry *ents;
+ struct xfs_dir3_icleaf_hdr leafhdr;
+
+ trace_xfs_dir2_leaf_addname(args);
+
+ dp = args->dp;
+ tp = args->trans;
+
+ error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk, -1, &lbp);
+ if (error)
+ return error;
+
+ /*
+ * Look up the entry by hash value and name.
+ * We know it's not there, our caller has already done a lookup.
+ * So the index is of the entry to insert in front of.
+ * But if there are dup hash values the index is of the first of those.
+ */
+ index = xfs_dir2_leaf_search_hash(args, lbp);
+ leaf = lbp->b_addr;
+ ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
+ ents = dp->d_ops->leaf_ents_p(leaf);
+ dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
+ bestsp = xfs_dir2_leaf_bests_p(ltp);
+ length = dp->d_ops->data_entsize(args->namelen);
+
+ /*
+ * See if there are any entries with the same hash value
+ * and space in their block for the new entry.
+ * This is good because it puts multiple same-hash value entries
+ * in a data block, improving the lookup of those entries.
+ */
+ for (use_block = -1, lep = &ents[index];
+ index < leafhdr.count && be32_to_cpu(lep->hashval) == args->hashval;
+ index++, lep++) {
+ if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
+ continue;
+ i = xfs_dir2_dataptr_to_db(args->geo, be32_to_cpu(lep->address));
+ ASSERT(i < be32_to_cpu(ltp->bestcount));
+ ASSERT(bestsp[i] != cpu_to_be16(NULLDATAOFF));
+ if (be16_to_cpu(bestsp[i]) >= length) {
+ use_block = i;
+ break;
+ }
+ }
+ /*
+ * Didn't find a block yet, linear search all the data blocks.
+ */
+ if (use_block == -1) {
+ for (i = 0; i < be32_to_cpu(ltp->bestcount); i++) {
+ /*
+ * Remember a block we see that's missing.
+ */
+ if (bestsp[i] == cpu_to_be16(NULLDATAOFF) &&
+ use_block == -1)
+ use_block = i;
+ else if (be16_to_cpu(bestsp[i]) >= length) {
+ use_block = i;
+ break;
+ }
+ }
+ }
+ /*
+ * How many bytes do we need in the leaf block?
+ */
+ needbytes = 0;
+ if (!leafhdr.stale)
+ needbytes += sizeof(xfs_dir2_leaf_entry_t);
+ if (use_block == -1)
+ needbytes += sizeof(xfs_dir2_data_off_t);
+
+ /*
+ * Now kill use_block if it refers to a missing block, so we
+ * can use it as an indication of allocation needed.
+ */
+ if (use_block != -1 && bestsp[use_block] == cpu_to_be16(NULLDATAOFF))
+ use_block = -1;
+ /*
+ * If we don't have enough free bytes but we can make enough
+ * by compacting out stale entries, we'll do that.
+ */
+ if ((char *)bestsp - (char *)&ents[leafhdr.count] < needbytes &&
+ leafhdr.stale > 1)
+ compact = 1;
+
+ /*
+ * Otherwise if we don't have enough free bytes we need to
+ * convert to node form.
+ */
+ else if ((char *)bestsp - (char *)&ents[leafhdr.count] < needbytes) {
+ /*
+ * Just checking or no space reservation, give up.
+ */
+ if ((args->op_flags & XFS_DA_OP_JUSTCHECK) ||
+ args->total == 0) {
+ xfs_trans_brelse(tp, lbp);
+ return -ENOSPC;
+ }
+ /*
+ * Convert to node form.
+ */
+ error = xfs_dir2_leaf_to_node(args, lbp);
+ if (error)
+ return error;
+ /*
+ * Then add the new entry.
+ */
+ return xfs_dir2_node_addname(args);
+ }
+ /*
+ * Otherwise it will fit without compaction.
+ */
+ else
+ compact = 0;
+ /*
+ * If just checking, then it will fit unless we needed to allocate
+ * a new data block.
+ */
+ if (args->op_flags & XFS_DA_OP_JUSTCHECK) {
+ xfs_trans_brelse(tp, lbp);
+ return use_block == -1 ? -ENOSPC : 0;
+ }
+ /*
+ * If no allocations are allowed, return now before we've
+ * changed anything.
+ */
+ if (args->total == 0 && use_block == -1) {
+ xfs_trans_brelse(tp, lbp);
+ return -ENOSPC;
+ }
+ /*
+ * Need to compact the leaf entries, removing stale ones.
+ * Leave one stale entry behind - the one closest to our
+ * insertion index - and we'll shift that one to our insertion
+ * point later.
+ */
+ if (compact) {
+ xfs_dir3_leaf_compact_x1(&leafhdr, ents, &index, &lowstale,
+ &highstale, &lfloglow, &lfloghigh);
+ }
+ /*
+ * There are stale entries, so we'll need log-low and log-high
+ * impossibly bad values later.
+ */
+ else if (leafhdr.stale) {
+ lfloglow = leafhdr.count;
+ lfloghigh = -1;
+ }
+ /*
+ * If there was no data block space found, we need to allocate
+ * a new one.
+ */
+ if (use_block == -1) {
+ /*
+ * Add the new data block.
+ */
+ if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE,
+ &use_block))) {
+ xfs_trans_brelse(tp, lbp);
+ return error;
+ }
+ /*
+ * Initialize the block.
+ */
+ if ((error = xfs_dir3_data_init(args, use_block, &dbp))) {
+ xfs_trans_brelse(tp, lbp);
+ return error;
+ }
+ /*
+ * If we're adding a new data block on the end we need to
+ * extend the bests table. Copy it up one entry.
+ */
+ if (use_block >= be32_to_cpu(ltp->bestcount)) {
+ bestsp--;
+ memmove(&bestsp[0], &bestsp[1],
+ be32_to_cpu(ltp->bestcount) * sizeof(bestsp[0]));
+ be32_add_cpu(<p->bestcount, 1);
+ xfs_dir3_leaf_log_tail(args, lbp);
+ xfs_dir3_leaf_log_bests(args, lbp, 0,
+ be32_to_cpu(ltp->bestcount) - 1);
+ }
+ /*
+ * If we're filling in a previously empty block just log it.
+ */
+ else
+ xfs_dir3_leaf_log_bests(args, lbp, use_block, use_block);
+ hdr = dbp->b_addr;
+ bf = dp->d_ops->data_bestfree_p(hdr);
+ bestsp[use_block] = bf[0].length;
+ grown = 1;
+ } else {
+ /*
+ * Already had space in some data block.
+ * Just read that one in.
+ */
+ error = xfs_dir3_data_read(tp, dp,
+ xfs_dir2_db_to_da(args->geo, use_block),
+ -1, &dbp);
+ if (error) {
+ xfs_trans_brelse(tp, lbp);
+ return error;
+ }
+ hdr = dbp->b_addr;
+ bf = dp->d_ops->data_bestfree_p(hdr);
+ grown = 0;
+ }
+ /*
+ * Point to the biggest freespace in our data block.
+ */
+ dup = (xfs_dir2_data_unused_t *)
+ ((char *)hdr + be16_to_cpu(bf[0].offset));
+ ASSERT(be16_to_cpu(dup->length) >= length);
+ needscan = needlog = 0;
+ /*
+ * Mark the initial part of our freespace in use for the new entry.
+ */
+ xfs_dir2_data_use_free(args, dbp, dup,
+ (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length,
+ &needlog, &needscan);
+ /*
+ * Initialize our new entry (at last).
+ */
+ dep = (xfs_dir2_data_entry_t *)dup;
+ dep->inumber = cpu_to_be64(args->inumber);
+ dep->namelen = args->namelen;
+ memcpy(dep->name, args->name, dep->namelen);
+ dp->d_ops->data_put_ftype(dep, args->filetype);
+ tagp = dp->d_ops->data_entry_tag_p(dep);
+ *tagp = cpu_to_be16((char *)dep - (char *)hdr);
+ /*
+ * Need to scan fix up the bestfree table.
+ */
+ if (needscan)
+ xfs_dir2_data_freescan(dp, hdr, &needlog);
+ /*
+ * Need to log the data block's header.
+ */
+ if (needlog)
+ xfs_dir2_data_log_header(args, dbp);
+ xfs_dir2_data_log_entry(args, dbp, dep);
+ /*
+ * If the bests table needs to be changed, do it.
+ * Log the change unless we've already done that.
+ */
+ if (be16_to_cpu(bestsp[use_block]) != be16_to_cpu(bf[0].length)) {
+ bestsp[use_block] = bf[0].length;
+ if (!grown)
+ xfs_dir3_leaf_log_bests(args, lbp, use_block, use_block);
+ }
+
+ lep = xfs_dir3_leaf_find_entry(&leafhdr, ents, index, compact, lowstale,
+ highstale, &lfloglow, &lfloghigh);
+
+ /*
+ * Fill in the new leaf entry.
+ */
+ lep->hashval = cpu_to_be32(args->hashval);
+ lep->address = cpu_to_be32(
+ xfs_dir2_db_off_to_dataptr(args->geo, use_block,
+ be16_to_cpu(*tagp)));
+ /*
+ * Log the leaf fields and give up the buffers.
+ */
+ dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
+ xfs_dir3_leaf_log_header(args, lbp);
+ xfs_dir3_leaf_log_ents(args, lbp, lfloglow, lfloghigh);
+ xfs_dir3_leaf_check(dp, lbp);
+ xfs_dir3_data_check(dp, dbp);
+ return 0;
+}
+
+/*
+ * Compact out any stale entries in the leaf.
+ * Log the header and changed leaf entries, if any.
+ */
+void
+xfs_dir3_leaf_compact(
+ xfs_da_args_t *args, /* operation arguments */
+ struct xfs_dir3_icleaf_hdr *leafhdr,
+ struct xfs_buf *bp) /* leaf buffer */
+{
+ int from; /* source leaf index */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ int loglow; /* first leaf entry to log */
+ int to; /* target leaf index */
+ struct xfs_dir2_leaf_entry *ents;
+ struct xfs_inode *dp = args->dp;
+
+ leaf = bp->b_addr;
+ if (!leafhdr->stale)
+ return;
+
+ /*
+ * Compress out the stale entries in place.
+ */
+ ents = dp->d_ops->leaf_ents_p(leaf);
+ for (from = to = 0, loglow = -1; from < leafhdr->count; from++) {
+ if (ents[from].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
+ continue;
+ /*
+ * Only actually copy the entries that are different.
+ */
+ if (from > to) {
+ if (loglow == -1)
+ loglow = to;
+ ents[to] = ents[from];
+ }
+ to++;
+ }
+ /*
+ * Update and log the header, log the leaf entries.
+ */
+ ASSERT(leafhdr->stale == from - to);
+ leafhdr->count -= leafhdr->stale;
+ leafhdr->stale = 0;
+
+ dp->d_ops->leaf_hdr_to_disk(leaf, leafhdr);
+ xfs_dir3_leaf_log_header(args, bp);
+ if (loglow != -1)
+ xfs_dir3_leaf_log_ents(args, bp, loglow, to - 1);
+}
+
+/*
+ * Compact the leaf entries, removing stale ones.
+ * Leave one stale entry behind - the one closest to our
+ * insertion index - and the caller will shift that one to our insertion
+ * point later.
+ * Return new insertion index, where the remaining stale entry is,
+ * and leaf logging indices.
+ */
+void
+xfs_dir3_leaf_compact_x1(
+ struct xfs_dir3_icleaf_hdr *leafhdr,
+ struct xfs_dir2_leaf_entry *ents,
+ int *indexp, /* insertion index */
+ int *lowstalep, /* out: stale entry before us */
+ int *highstalep, /* out: stale entry after us */
+ int *lowlogp, /* out: low log index */
+ int *highlogp) /* out: high log index */
+{
+ int from; /* source copy index */
+ int highstale; /* stale entry at/after index */
+ int index; /* insertion index */
+ int keepstale; /* source index of kept stale */
+ int lowstale; /* stale entry before index */
+ int newindex=0; /* new insertion index */
+ int to; /* destination copy index */
+
+ ASSERT(leafhdr->stale > 1);
+ index = *indexp;
+
+ xfs_dir3_leaf_find_stale(leafhdr, ents, index, &lowstale, &highstale);
+
+ /*
+ * Pick the better of lowstale and highstale.
+ */
+ if (lowstale >= 0 &&
+ (highstale == leafhdr->count ||
+ index - lowstale <= highstale - index))
+ keepstale = lowstale;
+ else
+ keepstale = highstale;
+ /*
+ * Copy the entries in place, removing all the stale entries
+ * except keepstale.
+ */
+ for (from = to = 0; from < leafhdr->count; from++) {
+ /*
+ * Notice the new value of index.
+ */
+ if (index == from)
+ newindex = to;
+ if (from != keepstale &&
+ ents[from].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) {
+ if (from == to)
+ *lowlogp = to;
+ continue;
+ }
+ /*
+ * Record the new keepstale value for the insertion.
+ */
+ if (from == keepstale)
+ lowstale = highstale = to;
+ /*
+ * Copy only the entries that have moved.
+ */
+ if (from > to)
+ ents[to] = ents[from];
+ to++;
+ }
+ ASSERT(from > to);
+ /*
+ * If the insertion point was past the last entry,
+ * set the new insertion point accordingly.
+ */
+ if (index == from)
+ newindex = to;
+ *indexp = newindex;
+ /*
+ * Adjust the leaf header values.
+ */
+ leafhdr->count -= from - to;
+ leafhdr->stale = 1;
+ /*
+ * Remember the low/high stale value only in the "right"
+ * direction.
+ */
+ if (lowstale >= newindex)
+ lowstale = -1;
+ else
+ highstale = leafhdr->count;
+ *highlogp = leafhdr->count - 1;
+ *lowstalep = lowstale;
+ *highstalep = highstale;
+}
+
+/*
+ * Log the bests entries indicated from a leaf1 block.
+ */
+static void
+xfs_dir3_leaf_log_bests(
+ struct xfs_da_args *args,
+ struct xfs_buf *bp, /* leaf buffer */
+ int first, /* first entry to log */
+ int last) /* last entry to log */
+{
+ __be16 *firstb; /* pointer to first entry */
+ __be16 *lastb; /* pointer to last entry */
+ struct xfs_dir2_leaf *leaf = bp->b_addr;
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
+
+ ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC));
+
+ ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
+ firstb = xfs_dir2_leaf_bests_p(ltp) + first;
+ lastb = xfs_dir2_leaf_bests_p(ltp) + last;
+ xfs_trans_log_buf(args->trans, bp,
+ (uint)((char *)firstb - (char *)leaf),
+ (uint)((char *)lastb - (char *)leaf + sizeof(*lastb) - 1));
+}
+
+/*
+ * Log the leaf entries indicated from a leaf1 or leafn block.
+ */
+void
+xfs_dir3_leaf_log_ents(
+ struct xfs_da_args *args,
+ struct xfs_buf *bp,
+ int first,
+ int last)
+{
+ xfs_dir2_leaf_entry_t *firstlep; /* pointer to first entry */
+ xfs_dir2_leaf_entry_t *lastlep; /* pointer to last entry */
+ struct xfs_dir2_leaf *leaf = bp->b_addr;
+ struct xfs_dir2_leaf_entry *ents;
+
+ ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC));
+
+ ents = args->dp->d_ops->leaf_ents_p(leaf);
+ firstlep = &ents[first];
+ lastlep = &ents[last];
+ xfs_trans_log_buf(args->trans, bp,
+ (uint)((char *)firstlep - (char *)leaf),
+ (uint)((char *)lastlep - (char *)leaf + sizeof(*lastlep) - 1));
+}
+
+/*
+ * Log the header of the leaf1 or leafn block.
+ */
+void
+xfs_dir3_leaf_log_header(
+ struct xfs_da_args *args,
+ struct xfs_buf *bp)
+{
+ struct xfs_dir2_leaf *leaf = bp->b_addr;
+
+ ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC));
+
+ xfs_trans_log_buf(args->trans, bp,
+ (uint)((char *)&leaf->hdr - (char *)leaf),
+ args->dp->d_ops->leaf_hdr_size - 1);
+}
+
+/*
+ * Log the tail of the leaf1 block.
+ */
+STATIC void
+xfs_dir3_leaf_log_tail(
+ struct xfs_da_args *args,
+ struct xfs_buf *bp)
+{
+ struct xfs_dir2_leaf *leaf = bp->b_addr;
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
+
+ ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAF1_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
+ leaf->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC));
+
+ ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
+ xfs_trans_log_buf(args->trans, bp, (uint)((char *)ltp - (char *)leaf),
+ (uint)(args->geo->blksize - 1));
+}
+
+/*
+ * Look up the entry referred to by args in the leaf format directory.
+ * Most of the work is done by the xfs_dir2_leaf_lookup_int routine which
+ * is also used by the node-format code.
+ */
+int
+xfs_dir2_leaf_lookup(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ struct xfs_buf *dbp; /* data block buffer */
+ xfs_dir2_data_entry_t *dep; /* data block entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ int index; /* found entry index */
+ struct xfs_buf *lbp; /* leaf buffer */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ xfs_trans_t *tp; /* transaction pointer */
+ struct xfs_dir2_leaf_entry *ents;
+
+ trace_xfs_dir2_leaf_lookup(args);
+
+ /*
+ * Look up name in the leaf block, returning both buffers and index.
+ */
+ if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
+ return error;
+ }
+ tp = args->trans;
+ dp = args->dp;
+ xfs_dir3_leaf_check(dp, lbp);
+ leaf = lbp->b_addr;
+ ents = dp->d_ops->leaf_ents_p(leaf);
+ /*
+ * Get to the leaf entry and contained data entry address.
+ */
+ lep = &ents[index];
+
+ /*
+ * Point to the data entry.
+ */
+ dep = (xfs_dir2_data_entry_t *)
+ ((char *)dbp->b_addr +
+ xfs_dir2_dataptr_to_off(args->geo, be32_to_cpu(lep->address)));
+ /*
+ * Return the found inode number & CI name if appropriate
+ */
+ args->inumber = be64_to_cpu(dep->inumber);
+ args->filetype = dp->d_ops->data_get_ftype(dep);
+ error = xfs_dir_cilookup_result(args, dep->name, dep->namelen);
+ xfs_trans_brelse(tp, dbp);
+ xfs_trans_brelse(tp, lbp);
+ return error;
+}
+
+/*
+ * Look up name/hash in the leaf block.
+ * Fill in indexp with the found index, and dbpp with the data buffer.
+ * If not found dbpp will be NULL, and ENOENT comes back.
+ * lbpp will always be filled in with the leaf buffer unless there's an error.
+ */
+static int /* error */
+xfs_dir2_leaf_lookup_int(
+ xfs_da_args_t *args, /* operation arguments */
+ struct xfs_buf **lbpp, /* out: leaf buffer */
+ int *indexp, /* out: index in leaf block */
+ struct xfs_buf **dbpp) /* out: data buffer */
+{
+ xfs_dir2_db_t curdb = -1; /* current data block number */
+ struct xfs_buf *dbp = NULL; /* data buffer */
+ xfs_dir2_data_entry_t *dep; /* data entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ int index; /* index in leaf block */
+ struct xfs_buf *lbp; /* leaf buffer */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_mount_t *mp; /* filesystem mount point */
+ xfs_dir2_db_t newdb; /* new data block number */
+ xfs_trans_t *tp; /* transaction pointer */
+ xfs_dir2_db_t cidb = -1; /* case match data block no. */
+ enum xfs_dacmp cmp; /* name compare result */
+ struct xfs_dir2_leaf_entry *ents;
+ struct xfs_dir3_icleaf_hdr leafhdr;
+
+ dp = args->dp;
+ tp = args->trans;
+ mp = dp->i_mount;
+
+ error = xfs_dir3_leaf_read(tp, dp, args->geo->leafblk, -1, &lbp);
+ if (error)
+ return error;
+
+ *lbpp = lbp;
+ leaf = lbp->b_addr;
+ xfs_dir3_leaf_check(dp, lbp);
+ ents = dp->d_ops->leaf_ents_p(leaf);
+ dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
+
+ /*
+ * Look for the first leaf entry with our hash value.
+ */
+ index = xfs_dir2_leaf_search_hash(args, lbp);
+ /*
+ * Loop over all the entries with the right hash value
+ * looking to match the name.
+ */
+ for (lep = &ents[index];
+ index < leafhdr.count && be32_to_cpu(lep->hashval) == args->hashval;
+ lep++, index++) {
+ /*
+ * Skip over stale leaf entries.
+ */
+ if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
+ continue;
+ /*
+ * Get the new data block number.
+ */
+ newdb = xfs_dir2_dataptr_to_db(args->geo,
+ be32_to_cpu(lep->address));
+ /*
+ * If it's not the same as the old data block number,
+ * need to pitch the old one and read the new one.
+ */
+ if (newdb != curdb) {
+ if (dbp)
+ xfs_trans_brelse(tp, dbp);
+ error = xfs_dir3_data_read(tp, dp,
+ xfs_dir2_db_to_da(args->geo, newdb),
+ -1, &dbp);
+ if (error) {
+ xfs_trans_brelse(tp, lbp);
+ return error;
+ }
+ curdb = newdb;
+ }
+ /*
+ * Point to the data entry.
+ */
+ dep = (xfs_dir2_data_entry_t *)((char *)dbp->b_addr +
+ xfs_dir2_dataptr_to_off(args->geo,
+ be32_to_cpu(lep->address)));
+ /*
+ * Compare name and if it's an exact match, return the index
+ * and buffer. If it's the first case-insensitive match, store
+ * the index and buffer and continue looking for an exact match.
+ */
+ cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
+ if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
+ args->cmpresult = cmp;
+ *indexp = index;
+ /* case exact match: return the current buffer. */
+ if (cmp == XFS_CMP_EXACT) {
+ *dbpp = dbp;
+ return 0;
+ }
+ cidb = curdb;
+ }
+ }
+ ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
+ /*
+ * Here, we can only be doing a lookup (not a rename or remove).
+ * If a case-insensitive match was found earlier, re-read the
+ * appropriate data block if required and return it.
+ */
+ if (args->cmpresult == XFS_CMP_CASE) {
+ ASSERT(cidb != -1);
+ if (cidb != curdb) {
+ xfs_trans_brelse(tp, dbp);
+ error = xfs_dir3_data_read(tp, dp,
+ xfs_dir2_db_to_da(args->geo, cidb),
+ -1, &dbp);
+ if (error) {
+ xfs_trans_brelse(tp, lbp);
+ return error;
+ }
+ }
+ *dbpp = dbp;
+ return 0;
+ }
+ /*
+ * No match found, return -ENOENT.
+ */
+ ASSERT(cidb == -1);
+ if (dbp)
+ xfs_trans_brelse(tp, dbp);
+ xfs_trans_brelse(tp, lbp);
+ return -ENOENT;
+}
+
+/*
+ * Remove an entry from a leaf format directory.
+ */
+int /* error */
+xfs_dir2_leaf_removename(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ __be16 *bestsp; /* leaf block best freespace */
+ xfs_dir2_data_hdr_t *hdr; /* data block header */
+ xfs_dir2_db_t db; /* data block number */
+ struct xfs_buf *dbp; /* data block buffer */
+ xfs_dir2_data_entry_t *dep; /* data entry structure */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ xfs_dir2_db_t i; /* temporary data block # */
+ int index; /* index into leaf entries */
+ struct xfs_buf *lbp; /* leaf buffer */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
+ int needlog; /* need to log data header */
+ int needscan; /* need to rescan data frees */
+ xfs_dir2_data_off_t oldbest; /* old value of best free */
+ struct xfs_dir2_data_free *bf; /* bestfree table */
+ struct xfs_dir2_leaf_entry *ents;
+ struct xfs_dir3_icleaf_hdr leafhdr;
+
+ trace_xfs_dir2_leaf_removename(args);
+
+ /*
+ * Lookup the leaf entry, get the leaf and data blocks read in.
+ */
+ if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
+ return error;
+ }
+ dp = args->dp;
+ leaf = lbp->b_addr;
+ hdr = dbp->b_addr;
+ xfs_dir3_data_check(dp, dbp);
+ bf = dp->d_ops->data_bestfree_p(hdr);
+ dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
+ ents = dp->d_ops->leaf_ents_p(leaf);
+ /*
+ * Point to the leaf entry, use that to point to the data entry.
+ */
+ lep = &ents[index];
+ db = xfs_dir2_dataptr_to_db(args->geo, be32_to_cpu(lep->address));
+ dep = (xfs_dir2_data_entry_t *)((char *)hdr +
+ xfs_dir2_dataptr_to_off(args->geo, be32_to_cpu(lep->address)));
+ needscan = needlog = 0;
+ oldbest = be16_to_cpu(bf[0].length);
+ ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
+ bestsp = xfs_dir2_leaf_bests_p(ltp);
+ ASSERT(be16_to_cpu(bestsp[db]) == oldbest);
+ /*
+ * Mark the former data entry unused.
+ */
+ xfs_dir2_data_make_free(args, dbp,
+ (xfs_dir2_data_aoff_t)((char *)dep - (char *)hdr),
+ dp->d_ops->data_entsize(dep->namelen), &needlog, &needscan);
+ /*
+ * We just mark the leaf entry stale by putting a null in it.
+ */
+ leafhdr.stale++;
+ dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
+ xfs_dir3_leaf_log_header(args, lbp);
+
+ lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
+ xfs_dir3_leaf_log_ents(args, lbp, index, index);
+
+ /*
+ * Scan the freespace in the data block again if necessary,
+ * log the data block header if necessary.
+ */
+ if (needscan)
+ xfs_dir2_data_freescan(dp, hdr, &needlog);
+ if (needlog)
+ xfs_dir2_data_log_header(args, dbp);
+ /*
+ * If the longest freespace in the data block has changed,
+ * put the new value in the bests table and log that.
+ */
+ if (be16_to_cpu(bf[0].length) != oldbest) {
+ bestsp[db] = bf[0].length;
+ xfs_dir3_leaf_log_bests(args, lbp, db, db);
+ }
+ xfs_dir3_data_check(dp, dbp);
+ /*
+ * If the data block is now empty then get rid of the data block.
+ */
+ if (be16_to_cpu(bf[0].length) ==
+ args->geo->blksize - dp->d_ops->data_entry_offset) {
+ ASSERT(db != args->geo->datablk);
+ if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
+ /*
+ * Nope, can't get rid of it because it caused
+ * allocation of a bmap btree block to do so.
+ * Just go on, returning success, leaving the
+ * empty block in place.
+ */
+ if (error == -ENOSPC && args->total == 0)
+ error = 0;
+ xfs_dir3_leaf_check(dp, lbp);
+ return error;
+ }
+ dbp = NULL;
+ /*
+ * If this is the last data block then compact the
+ * bests table by getting rid of entries.
+ */
+ if (db == be32_to_cpu(ltp->bestcount) - 1) {
+ /*
+ * Look for the last active entry (i).
+ */
+ for (i = db - 1; i > 0; i--) {
+ if (bestsp[i] != cpu_to_be16(NULLDATAOFF))
+ break;
+ }
+ /*
+ * Copy the table down so inactive entries at the
+ * end are removed.
+ */
+ memmove(&bestsp[db - i], bestsp,
+ (be32_to_cpu(ltp->bestcount) - (db - i)) * sizeof(*bestsp));
+ be32_add_cpu(<p->bestcount, -(db - i));
+ xfs_dir3_leaf_log_tail(args, lbp);
+ xfs_dir3_leaf_log_bests(args, lbp, 0,
+ be32_to_cpu(ltp->bestcount) - 1);
+ } else
+ bestsp[db] = cpu_to_be16(NULLDATAOFF);
+ }
+ /*
+ * If the data block was not the first one, drop it.
+ */
+ else if (db != args->geo->datablk)
+ dbp = NULL;
+
+ xfs_dir3_leaf_check(dp, lbp);
+ /*
+ * See if we can convert to block form.
+ */
+ return xfs_dir2_leaf_to_block(args, lbp, dbp);
+}
+
+/*
+ * Replace the inode number in a leaf format directory entry.
+ */
+int /* error */
+xfs_dir2_leaf_replace(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ struct xfs_buf *dbp; /* data block buffer */
+ xfs_dir2_data_entry_t *dep; /* data block entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ int index; /* index of leaf entry */
+ struct xfs_buf *lbp; /* leaf buffer */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ xfs_trans_t *tp; /* transaction pointer */
+ struct xfs_dir2_leaf_entry *ents;
+
+ trace_xfs_dir2_leaf_replace(args);
+
+ /*
+ * Look up the entry.
+ */
+ if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
+ return error;
+ }
+ dp = args->dp;
+ leaf = lbp->b_addr;
+ ents = dp->d_ops->leaf_ents_p(leaf);
+ /*
+ * Point to the leaf entry, get data address from it.
+ */
+ lep = &ents[index];
+ /*
+ * Point to the data entry.
+ */
+ dep = (xfs_dir2_data_entry_t *)
+ ((char *)dbp->b_addr +
+ xfs_dir2_dataptr_to_off(args->geo, be32_to_cpu(lep->address)));
+ ASSERT(args->inumber != be64_to_cpu(dep->inumber));
+ /*
+ * Put the new inode number in, log it.
+ */
+ dep->inumber = cpu_to_be64(args->inumber);
+ dp->d_ops->data_put_ftype(dep, args->filetype);
+ tp = args->trans;
+ xfs_dir2_data_log_entry(args, dbp, dep);
+ xfs_dir3_leaf_check(dp, lbp);
+ xfs_trans_brelse(tp, lbp);
+ return 0;
+}
+
+/*
+ * Return index in the leaf block (lbp) which is either the first
+ * one with this hash value, or if there are none, the insert point
+ * for that hash value.
+ */
+int /* index value */
+xfs_dir2_leaf_search_hash(
+ xfs_da_args_t *args, /* operation arguments */
+ struct xfs_buf *lbp) /* leaf buffer */
+{
+ xfs_dahash_t hash=0; /* hash from this entry */
+ xfs_dahash_t hashwant; /* hash value looking for */
+ int high; /* high leaf index */
+ int low; /* low leaf index */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ int mid=0; /* current leaf index */
+ struct xfs_dir2_leaf_entry *ents;
+ struct xfs_dir3_icleaf_hdr leafhdr;
+
+ leaf = lbp->b_addr;
+ ents = args->dp->d_ops->leaf_ents_p(leaf);
+ args->dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
+
+ /*
+ * Note, the table cannot be empty, so we have to go through the loop.
+ * Binary search the leaf entries looking for our hash value.
+ */
+ for (lep = ents, low = 0, high = leafhdr.count - 1,
+ hashwant = args->hashval;
+ low <= high; ) {
+ mid = (low + high) >> 1;
+ if ((hash = be32_to_cpu(lep[mid].hashval)) == hashwant)
+ break;
+ if (hash < hashwant)
+ low = mid + 1;
+ else
+ high = mid - 1;
+ }
+ /*
+ * Found one, back up through all the equal hash values.
+ */
+ if (hash == hashwant) {
+ while (mid > 0 && be32_to_cpu(lep[mid - 1].hashval) == hashwant) {
+ mid--;
+ }
+ }
+ /*
+ * Need to point to an entry higher than ours.
+ */
+ else if (hash < hashwant)
+ mid++;
+ return mid;
+}
+
+/*
+ * Trim off a trailing data block. We know it's empty since the leaf
+ * freespace table says so.
+ */
+int /* error */
+xfs_dir2_leaf_trim_data(
+ xfs_da_args_t *args, /* operation arguments */
+ struct xfs_buf *lbp, /* leaf buffer */
+ xfs_dir2_db_t db) /* data block number */
+{
+ __be16 *bestsp; /* leaf bests table */
+ struct xfs_buf *dbp; /* data block buffer */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return value */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ dp = args->dp;
+ tp = args->trans;
+ /*
+ * Read the offending data block. We need its buffer.
+ */
+ error = xfs_dir3_data_read(tp, dp, xfs_dir2_db_to_da(args->geo, db),
+ -1, &dbp);
+ if (error)
+ return error;
+
+ leaf = lbp->b_addr;
+ ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
+
+#ifdef DEBUG
+{
+ struct xfs_dir2_data_hdr *hdr = dbp->b_addr;
+ struct xfs_dir2_data_free *bf = dp->d_ops->data_bestfree_p(hdr);
+
+ ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
+ hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC));
+ ASSERT(be16_to_cpu(bf[0].length) ==
+ args->geo->blksize - dp->d_ops->data_entry_offset);
+ ASSERT(db == be32_to_cpu(ltp->bestcount) - 1);
+}
+#endif
+
+ /*
+ * Get rid of the data block.
+ */
+ if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
+ ASSERT(error != -ENOSPC);
+ xfs_trans_brelse(tp, dbp);
+ return error;
+ }
+ /*
+ * Eliminate the last bests entry from the table.
+ */
+ bestsp = xfs_dir2_leaf_bests_p(ltp);
+ be32_add_cpu(<p->bestcount, -1);
+ memmove(&bestsp[1], &bestsp[0], be32_to_cpu(ltp->bestcount) * sizeof(*bestsp));
+ xfs_dir3_leaf_log_tail(args, lbp);
+ xfs_dir3_leaf_log_bests(args, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
+ return 0;
+}
+
+static inline size_t
+xfs_dir3_leaf_size(
+ struct xfs_dir3_icleaf_hdr *hdr,
+ int counts)
+{
+ int entries;
+ int hdrsize;
+
+ entries = hdr->count - hdr->stale;
+ if (hdr->magic == XFS_DIR2_LEAF1_MAGIC ||
+ hdr->magic == XFS_DIR2_LEAFN_MAGIC)
+ hdrsize = sizeof(struct xfs_dir2_leaf_hdr);
+ else
+ hdrsize = sizeof(struct xfs_dir3_leaf_hdr);
+
+ return hdrsize + entries * sizeof(xfs_dir2_leaf_entry_t)
+ + counts * sizeof(xfs_dir2_data_off_t)
+ + sizeof(xfs_dir2_leaf_tail_t);
+}
+
+/*
+ * Convert node form directory to leaf form directory.
+ * The root of the node form dir needs to already be a LEAFN block.
+ * Just return if we can't do anything.
+ */
+int /* error */
+xfs_dir2_node_to_leaf(
+ xfs_da_state_t *state) /* directory operation state */
+{
+ xfs_da_args_t *args; /* operation arguments */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ struct xfs_buf *fbp; /* buffer for freespace block */
+ xfs_fileoff_t fo; /* freespace file offset */
+ xfs_dir2_free_t *free; /* freespace structure */
+ struct xfs_buf *lbp; /* buffer for leaf block */
+ xfs_dir2_leaf_tail_t *ltp; /* tail of leaf structure */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int rval; /* successful free trim? */
+ xfs_trans_t *tp; /* transaction pointer */
+ struct xfs_dir3_icleaf_hdr leafhdr;
+ struct xfs_dir3_icfree_hdr freehdr;
+
+ /*
+ * There's more than a leaf level in the btree, so there must
+ * be multiple leafn blocks. Give up.
+ */
+ if (state->path.active > 1)
+ return 0;
+ args = state->args;
+
+ trace_xfs_dir2_node_to_leaf(args);
+
+ mp = state->mp;
+ dp = args->dp;
+ tp = args->trans;
+ /*
+ * Get the last offset in the file.
+ */
+ if ((error = xfs_bmap_last_offset(dp, &fo, XFS_DATA_FORK))) {
+ return error;
+ }
+ fo -= args->geo->fsbcount;
+ /*
+ * If there are freespace blocks other than the first one,
+ * take this opportunity to remove trailing empty freespace blocks
+ * that may have been left behind during no-space-reservation
+ * operations.
+ */
+ while (fo > args->geo->freeblk) {
+ if ((error = xfs_dir2_node_trim_free(args, fo, &rval))) {
+ return error;
+ }
+ if (rval)
+ fo -= args->geo->fsbcount;
+ else
+ return 0;
+ }
+ /*
+ * Now find the block just before the freespace block.
+ */
+ if ((error = xfs_bmap_last_before(tp, dp, &fo, XFS_DATA_FORK))) {
+ return error;
+ }
+ /*
+ * If it's not the single leaf block, give up.
+ */
+ if (XFS_FSB_TO_B(mp, fo) > XFS_DIR2_LEAF_OFFSET + args->geo->blksize)
+ return 0;
+ lbp = state->path.blk[0].bp;
+ leaf = lbp->b_addr;
+ dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
+
+ ASSERT(leafhdr.magic == XFS_DIR2_LEAFN_MAGIC ||
+ leafhdr.magic == XFS_DIR3_LEAFN_MAGIC);
+
+ /*
+ * Read the freespace block.
+ */
+ error = xfs_dir2_free_read(tp, dp, args->geo->freeblk, &fbp);
+ if (error)
+ return error;
+ free = fbp->b_addr;
+ dp->d_ops->free_hdr_from_disk(&freehdr, free);
+
+ ASSERT(!freehdr.firstdb);
+
+ /*
+ * Now see if the leafn and free data will fit in a leaf1.
+ * If not, release the buffer and give up.
+ */
+ if (xfs_dir3_leaf_size(&leafhdr, freehdr.nvalid) > args->geo->blksize) {
+ xfs_trans_brelse(tp, fbp);
+ return 0;
+ }
+
+ /*
+ * If the leaf has any stale entries in it, compress them out.
+ */
+ if (leafhdr.stale)
+ xfs_dir3_leaf_compact(args, &leafhdr, lbp);
+
+ lbp->b_ops = &xfs_dir3_leaf1_buf_ops;
+ xfs_trans_buf_set_type(tp, lbp, XFS_BLFT_DIR_LEAF1_BUF);
+ leafhdr.magic = (leafhdr.magic == XFS_DIR2_LEAFN_MAGIC)
+ ? XFS_DIR2_LEAF1_MAGIC
+ : XFS_DIR3_LEAF1_MAGIC;
+
+ /*
+ * Set up the leaf tail from the freespace block.
+ */
+ ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
+ ltp->bestcount = cpu_to_be32(freehdr.nvalid);
+
+ /*
+ * Set up the leaf bests table.
+ */
+ memcpy(xfs_dir2_leaf_bests_p(ltp), dp->d_ops->free_bests_p(free),
+ freehdr.nvalid * sizeof(xfs_dir2_data_off_t));
+
+ dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
+ xfs_dir3_leaf_log_header(args, lbp);
+ xfs_dir3_leaf_log_bests(args, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
+ xfs_dir3_leaf_log_tail(args, lbp);
+ xfs_dir3_leaf_check(dp, lbp);
+
+ /*
+ * Get rid of the freespace block.
+ */
+ error = xfs_dir2_shrink_inode(args,
+ xfs_dir2_byte_to_db(args->geo, XFS_DIR2_FREE_OFFSET),
+ fbp);
+ if (error) {
+ /*
+ * This can't fail here because it can only happen when
+ * punching out the middle of an extent, and this is an
+ * isolated block.
+ */
+ ASSERT(error != -ENOSPC);
+ return error;
+ }
+ fbp = NULL;
+ /*
+ * Now see if we can convert the single-leaf directory
+ * down to a block form directory.
+ * This routine always kills the dabuf for the leaf, so
+ * eliminate it from the path.
+ */
+ error = xfs_dir2_leaf_to_block(args, lbp, NULL);
+ state->path.blk[0].bp = NULL;
+ return error;
+}
Code Review / kvmfornfv.git / blobdiff