diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/xfs/xfs_dir2_node.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/xfs/xfs_dir2_node.c | 1999 |
1 files changed, 0 insertions, 1999 deletions
diff --git a/ANDROID_3.4.5/fs/xfs/xfs_dir2_node.c b/ANDROID_3.4.5/fs/xfs/xfs_dir2_node.c deleted file mode 100644 index 0179a41d..00000000 --- a/ANDROID_3.4.5/fs/xfs/xfs_dir2_node.c +++ /dev/null @@ -1,1999 +0,0 @@ -/* - * Copyright (c) 2000-2005 Silicon Graphics, 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_types.h" -#include "xfs_log.h" -#include "xfs_inum.h" -#include "xfs_trans.h" -#include "xfs_sb.h" -#include "xfs_ag.h" -#include "xfs_mount.h" -#include "xfs_da_btree.h" -#include "xfs_bmap_btree.h" -#include "xfs_dinode.h" -#include "xfs_inode.h" -#include "xfs_bmap.h" -#include "xfs_dir2_format.h" -#include "xfs_dir2_priv.h" -#include "xfs_error.h" -#include "xfs_trace.h" - -/* - * Function declarations. - */ -static void xfs_dir2_free_log_header(xfs_trans_t *tp, xfs_dabuf_t *bp); -static int xfs_dir2_leafn_add(xfs_dabuf_t *bp, xfs_da_args_t *args, int index); -#ifdef DEBUG -static void xfs_dir2_leafn_check(xfs_inode_t *dp, xfs_dabuf_t *bp); -#else -#define xfs_dir2_leafn_check(dp, bp) -#endif -static void xfs_dir2_leafn_moveents(xfs_da_args_t *args, xfs_dabuf_t *bp_s, - int start_s, xfs_dabuf_t *bp_d, int start_d, - int count); -static void xfs_dir2_leafn_rebalance(xfs_da_state_t *state, - xfs_da_state_blk_t *blk1, - xfs_da_state_blk_t *blk2); -static int xfs_dir2_leafn_remove(xfs_da_args_t *args, xfs_dabuf_t *bp, - int index, xfs_da_state_blk_t *dblk, - int *rval); -static int xfs_dir2_node_addname_int(xfs_da_args_t *args, - xfs_da_state_blk_t *fblk); - -/* - * Log entries from a freespace block. - */ -STATIC void -xfs_dir2_free_log_bests( - xfs_trans_t *tp, /* transaction pointer */ - xfs_dabuf_t *bp, /* freespace buffer */ - int first, /* first entry to log */ - int last) /* last entry to log */ -{ - xfs_dir2_free_t *free; /* freespace structure */ - - free = bp->data; - ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); - xfs_da_log_buf(tp, bp, - (uint)((char *)&free->bests[first] - (char *)free), - (uint)((char *)&free->bests[last] - (char *)free + - sizeof(free->bests[0]) - 1)); -} - -/* - * Log header from a freespace block. - */ -static void -xfs_dir2_free_log_header( - xfs_trans_t *tp, /* transaction pointer */ - xfs_dabuf_t *bp) /* freespace buffer */ -{ - xfs_dir2_free_t *free; /* freespace structure */ - - free = bp->data; - ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); - xfs_da_log_buf(tp, bp, (uint)((char *)&free->hdr - (char *)free), - (uint)(sizeof(xfs_dir2_free_hdr_t) - 1)); -} - -/* - * Convert a leaf-format directory to a node-format directory. - * We need to change the magic number of the leaf block, and copy - * the freespace table out of the leaf block into its own block. - */ -int /* error */ -xfs_dir2_leaf_to_node( - xfs_da_args_t *args, /* operation arguments */ - xfs_dabuf_t *lbp) /* leaf buffer */ -{ - xfs_inode_t *dp; /* incore directory inode */ - int error; /* error return value */ - xfs_dabuf_t *fbp; /* freespace buffer */ - xfs_dir2_db_t fdb; /* freespace block number */ - xfs_dir2_free_t *free; /* freespace structure */ - __be16 *from; /* pointer to freespace entry */ - int i; /* leaf freespace index */ - xfs_dir2_leaf_t *leaf; /* leaf structure */ - xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */ - xfs_mount_t *mp; /* filesystem mount point */ - int n; /* count of live freespc ents */ - xfs_dir2_data_off_t off; /* freespace entry value */ - __be16 *to; /* pointer to freespace entry */ - xfs_trans_t *tp; /* transaction pointer */ - - trace_xfs_dir2_leaf_to_node(args); - - dp = args->dp; - mp = dp->i_mount; - tp = args->trans; - /* - * Add a freespace block to the directory. - */ - if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, &fdb))) { - return error; - } - ASSERT(fdb == XFS_DIR2_FREE_FIRSTDB(mp)); - /* - * Get the buffer for the new freespace block. - */ - if ((error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, fdb), -1, &fbp, - XFS_DATA_FORK))) { - return error; - } - ASSERT(fbp != NULL); - free = fbp->data; - leaf = lbp->data; - ltp = xfs_dir2_leaf_tail_p(mp, leaf); - /* - * Initialize the freespace block header. - */ - free->hdr.magic = cpu_to_be32(XFS_DIR2_FREE_MAGIC); - free->hdr.firstdb = 0; - ASSERT(be32_to_cpu(ltp->bestcount) <= (uint)dp->i_d.di_size / mp->m_dirblksize); - free->hdr.nvalid = ltp->bestcount; - /* - * Copy freespace entries from the leaf block to the new block. - * Count active entries. - */ - for (i = n = 0, from = xfs_dir2_leaf_bests_p(ltp), to = free->bests; - i < be32_to_cpu(ltp->bestcount); i++, from++, to++) { - if ((off = be16_to_cpu(*from)) != NULLDATAOFF) - n++; - *to = cpu_to_be16(off); - } - free->hdr.nused = cpu_to_be32(n); - leaf->hdr.info.magic = cpu_to_be16(XFS_DIR2_LEAFN_MAGIC); - /* - * Log everything. - */ - xfs_dir2_leaf_log_header(tp, lbp); - xfs_dir2_free_log_header(tp, fbp); - xfs_dir2_free_log_bests(tp, fbp, 0, be32_to_cpu(free->hdr.nvalid) - 1); - xfs_da_buf_done(fbp); - xfs_dir2_leafn_check(dp, lbp); - return 0; -} - -/* - * Add a leaf entry to a leaf block in a node-form directory. - * The other work necessary is done from the caller. - */ -static int /* error */ -xfs_dir2_leafn_add( - xfs_dabuf_t *bp, /* leaf buffer */ - xfs_da_args_t *args, /* operation arguments */ - int index) /* insertion pt for new entry */ -{ - int compact; /* compacting stale leaves */ - xfs_inode_t *dp; /* incore directory inode */ - int highstale; /* next stale entry */ - xfs_dir2_leaf_t *leaf; /* leaf structure */ - xfs_dir2_leaf_entry_t *lep; /* leaf entry */ - int lfloghigh; /* high leaf entry logging */ - int lfloglow; /* low leaf entry logging */ - int lowstale; /* previous stale entry */ - xfs_mount_t *mp; /* filesystem mount point */ - xfs_trans_t *tp; /* transaction pointer */ - - trace_xfs_dir2_leafn_add(args, index); - - dp = args->dp; - mp = dp->i_mount; - tp = args->trans; - leaf = bp->data; - - /* - * Quick check just to make sure we are not going to index - * into other peoples memory - */ - if (index < 0) - return XFS_ERROR(EFSCORRUPTED); - - /* - * If there are already the maximum number of leaf entries in - * the block, if there are no stale entries it won't fit. - * Caller will do a split. If there are stale entries we'll do - * a compact. - */ - - if (be16_to_cpu(leaf->hdr.count) == xfs_dir2_max_leaf_ents(mp)) { - if (!leaf->hdr.stale) - return XFS_ERROR(ENOSPC); - compact = be16_to_cpu(leaf->hdr.stale) > 1; - } else - compact = 0; - ASSERT(index == 0 || be32_to_cpu(leaf->ents[index - 1].hashval) <= args->hashval); - ASSERT(index == be16_to_cpu(leaf->hdr.count) || - be32_to_cpu(leaf->ents[index].hashval) >= args->hashval); - - if (args->op_flags & XFS_DA_OP_JUSTCHECK) - return 0; - - /* - * Compact out all but one stale leaf entry. Leaves behind - * the entry closest to index. - */ - if (compact) { - xfs_dir2_leaf_compact_x1(bp, &index, &lowstale, &highstale, - &lfloglow, &lfloghigh); - } - /* - * Set impossible logging indices for this case. - */ - else if (leaf->hdr.stale) { - lfloglow = be16_to_cpu(leaf->hdr.count); - lfloghigh = -1; - } - - /* - * Insert the new entry, log everything. - */ - lep = xfs_dir2_leaf_find_entry(leaf, index, compact, lowstale, - highstale, &lfloglow, &lfloghigh); - - lep->hashval = cpu_to_be32(args->hashval); - lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(mp, - args->blkno, args->index)); - xfs_dir2_leaf_log_header(tp, bp); - xfs_dir2_leaf_log_ents(tp, bp, lfloglow, lfloghigh); - xfs_dir2_leafn_check(dp, bp); - return 0; -} - -#ifdef DEBUG -/* - * Check internal consistency of a leafn block. - */ -void -xfs_dir2_leafn_check( - xfs_inode_t *dp, /* incore directory inode */ - xfs_dabuf_t *bp) /* leaf buffer */ -{ - int i; /* leaf index */ - xfs_dir2_leaf_t *leaf; /* leaf structure */ - xfs_mount_t *mp; /* filesystem mount point */ - int stale; /* count of stale leaves */ - - leaf = bp->data; - mp = dp->i_mount; - ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); - ASSERT(be16_to_cpu(leaf->hdr.count) <= xfs_dir2_max_leaf_ents(mp)); - for (i = stale = 0; i < be16_to_cpu(leaf->hdr.count); i++) { - if (i + 1 < be16_to_cpu(leaf->hdr.count)) { - ASSERT(be32_to_cpu(leaf->ents[i].hashval) <= - be32_to_cpu(leaf->ents[i + 1].hashval)); - } - if (leaf->ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) - stale++; - } - ASSERT(be16_to_cpu(leaf->hdr.stale) == stale); -} -#endif /* DEBUG */ - -/* - * Return the last hash value in the leaf. - * Stale entries are ok. - */ -xfs_dahash_t /* hash value */ -xfs_dir2_leafn_lasthash( - xfs_dabuf_t *bp, /* leaf buffer */ - int *count) /* count of entries in leaf */ -{ - xfs_dir2_leaf_t *leaf; /* leaf structure */ - - leaf = bp->data; - ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); - if (count) - *count = be16_to_cpu(leaf->hdr.count); - if (!leaf->hdr.count) - return 0; - return be32_to_cpu(leaf->ents[be16_to_cpu(leaf->hdr.count) - 1].hashval); -} - -/* - * Look up a leaf entry for space to add a name in a node-format leaf block. - * The extrablk in state is a freespace block. - */ -STATIC int -xfs_dir2_leafn_lookup_for_addname( - xfs_dabuf_t *bp, /* leaf buffer */ - xfs_da_args_t *args, /* operation arguments */ - int *indexp, /* out: leaf entry index */ - xfs_da_state_t *state) /* state to fill in */ -{ - xfs_dabuf_t *curbp = NULL; /* current data/free buffer */ - xfs_dir2_db_t curdb = -1; /* current data block number */ - xfs_dir2_db_t curfdb = -1; /* current free block number */ - xfs_inode_t *dp; /* incore directory inode */ - int error; /* error return value */ - int fi; /* free entry index */ - xfs_dir2_free_t *free = NULL; /* free block structure */ - int index; /* leaf entry index */ - xfs_dir2_leaf_t *leaf; /* leaf structure */ - int length; /* length of new data entry */ - xfs_dir2_leaf_entry_t *lep; /* leaf entry */ - xfs_mount_t *mp; /* filesystem mount point */ - xfs_dir2_db_t newdb; /* new data block number */ - xfs_dir2_db_t newfdb; /* new free block number */ - xfs_trans_t *tp; /* transaction pointer */ - - dp = args->dp; - tp = args->trans; - mp = dp->i_mount; - leaf = bp->data; - ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); -#ifdef __KERNEL__ - ASSERT(be16_to_cpu(leaf->hdr.count) > 0); -#endif - xfs_dir2_leafn_check(dp, bp); - /* - * Look up the hash value in the leaf entries. - */ - index = xfs_dir2_leaf_search_hash(args, bp); - /* - * Do we have a buffer coming in? - */ - if (state->extravalid) { - /* If so, it's a free block buffer, get the block number. */ - curbp = state->extrablk.bp; - curfdb = state->extrablk.blkno; - free = curbp->data; - ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); - } - length = xfs_dir2_data_entsize(args->namelen); - /* - * Loop over leaf entries with the right hash value. - */ - for (lep = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) && - be32_to_cpu(lep->hashval) == args->hashval; - lep++, index++) { - /* - * Skip stale leaf entries. - */ - if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR) - continue; - /* - * Pull the data block number from the entry. - */ - newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); - /* - * For addname, we're looking for a place to put the new entry. - * We want to use a data block with an entry of equal - * hash value to ours if there is one with room. - * - * If this block isn't the data block we already have - * in hand, take a look at it. - */ - if (newdb != curdb) { - curdb = newdb; - /* - * Convert the data block to the free block - * holding its freespace information. - */ - newfdb = xfs_dir2_db_to_fdb(mp, newdb); - /* - * If it's not the one we have in hand, read it in. - */ - if (newfdb != curfdb) { - /* - * If we had one before, drop it. - */ - if (curbp) - xfs_da_brelse(tp, curbp); - /* - * Read the free block. - */ - error = xfs_da_read_buf(tp, dp, - xfs_dir2_db_to_da(mp, newfdb), - -1, &curbp, XFS_DATA_FORK); - if (error) - return error; - free = curbp->data; - ASSERT(be32_to_cpu(free->hdr.magic) == - XFS_DIR2_FREE_MAGIC); - ASSERT((be32_to_cpu(free->hdr.firstdb) % - xfs_dir2_free_max_bests(mp)) == 0); - ASSERT(be32_to_cpu(free->hdr.firstdb) <= curdb); - ASSERT(curdb < be32_to_cpu(free->hdr.firstdb) + - be32_to_cpu(free->hdr.nvalid)); - } - /* - * Get the index for our entry. - */ - fi = xfs_dir2_db_to_fdindex(mp, curdb); - /* - * If it has room, return it. - */ - if (unlikely(free->bests[fi] == - cpu_to_be16(NULLDATAOFF))) { - XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int", - XFS_ERRLEVEL_LOW, mp); - if (curfdb != newfdb) - xfs_da_brelse(tp, curbp); - return XFS_ERROR(EFSCORRUPTED); - } - curfdb = newfdb; - if (be16_to_cpu(free->bests[fi]) >= length) - goto out; - } - } - /* Didn't find any space */ - fi = -1; -out: - ASSERT(args->op_flags & XFS_DA_OP_OKNOENT); - if (curbp) { - /* Giving back a free block. */ - state->extravalid = 1; - state->extrablk.bp = curbp; - state->extrablk.index = fi; - state->extrablk.blkno = curfdb; - state->extrablk.magic = XFS_DIR2_FREE_MAGIC; - } else { - state->extravalid = 0; - } - /* - * Return the index, that will be the insertion point. - */ - *indexp = index; - return XFS_ERROR(ENOENT); -} - -/* - * Look up a leaf entry in a node-format leaf block. - * The extrablk in state a data block. - */ -STATIC int -xfs_dir2_leafn_lookup_for_entry( - xfs_dabuf_t *bp, /* leaf buffer */ - xfs_da_args_t *args, /* operation arguments */ - int *indexp, /* out: leaf entry index */ - xfs_da_state_t *state) /* state to fill in */ -{ - xfs_dabuf_t *curbp = NULL; /* current data/free buffer */ - xfs_dir2_db_t curdb = -1; /* current data block number */ - xfs_dir2_data_entry_t *dep; /* data block entry */ - xfs_inode_t *dp; /* incore directory inode */ - int error; /* error return value */ - int index; /* leaf entry index */ - xfs_dir2_leaf_t *leaf; /* leaf structure */ - xfs_dir2_leaf_entry_t *lep; /* leaf entry */ - xfs_mount_t *mp; /* filesystem mount point */ - xfs_dir2_db_t newdb; /* new data block number */ - xfs_trans_t *tp; /* transaction pointer */ - enum xfs_dacmp cmp; /* comparison result */ - - dp = args->dp; - tp = args->trans; - mp = dp->i_mount; - leaf = bp->data; - ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); -#ifdef __KERNEL__ - ASSERT(be16_to_cpu(leaf->hdr.count) > 0); -#endif - xfs_dir2_leafn_check(dp, bp); - /* - * Look up the hash value in the leaf entries. - */ - index = xfs_dir2_leaf_search_hash(args, bp); - /* - * Do we have a buffer coming in? - */ - if (state->extravalid) { - curbp = state->extrablk.bp; - curdb = state->extrablk.blkno; - } - /* - * Loop over leaf entries with the right hash value. - */ - for (lep = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) && - be32_to_cpu(lep->hashval) == args->hashval; - lep++, index++) { - /* - * Skip stale leaf entries. - */ - if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR) - continue; - /* - * Pull the data block number from the entry. - */ - newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); - /* - * Not adding a new entry, so we really want to find - * the name given to us. - * - * If it's a different data block, go get it. - */ - if (newdb != curdb) { - /* - * If we had a block before that we aren't saving - * for a CI name, drop it - */ - if (curbp && (args->cmpresult == XFS_CMP_DIFFERENT || - curdb != state->extrablk.blkno)) - xfs_da_brelse(tp, curbp); - /* - * If needing the block that is saved with a CI match, - * use it otherwise read in the new data block. - */ - if (args->cmpresult != XFS_CMP_DIFFERENT && - newdb == state->extrablk.blkno) { - ASSERT(state->extravalid); - curbp = state->extrablk.bp; - } else { - error = xfs_da_read_buf(tp, dp, - xfs_dir2_db_to_da(mp, newdb), - -1, &curbp, XFS_DATA_FORK); - if (error) - return error; - } - xfs_dir2_data_check(dp, curbp); - curdb = newdb; - } - /* - * Point to the data entry. - */ - dep = (xfs_dir2_data_entry_t *)((char *)curbp->data + - xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address))); - /* - * Compare the entry and if it's an exact match, return - * EEXIST immediately. If it's the first case-insensitive - * match, store the block & inode number and continue looking. - */ - cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen); - if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) { - /* If there is a CI match block, drop it */ - if (args->cmpresult != XFS_CMP_DIFFERENT && - curdb != state->extrablk.blkno) - xfs_da_brelse(tp, state->extrablk.bp); - args->cmpresult = cmp; - args->inumber = be64_to_cpu(dep->inumber); - *indexp = index; - state->extravalid = 1; - state->extrablk.bp = curbp; - state->extrablk.blkno = curdb; - state->extrablk.index = (int)((char *)dep - - (char *)curbp->data); - state->extrablk.magic = XFS_DIR2_DATA_MAGIC; - if (cmp == XFS_CMP_EXACT) - return XFS_ERROR(EEXIST); - } - } - ASSERT(index == be16_to_cpu(leaf->hdr.count) || - (args->op_flags & XFS_DA_OP_OKNOENT)); - if (curbp) { - if (args->cmpresult == XFS_CMP_DIFFERENT) { - /* Giving back last used data block. */ - state->extravalid = 1; - state->extrablk.bp = curbp; - state->extrablk.index = -1; - state->extrablk.blkno = curdb; - state->extrablk.magic = XFS_DIR2_DATA_MAGIC; - } else { - /* If the curbp is not the CI match block, drop it */ - if (state->extrablk.bp != curbp) - xfs_da_brelse(tp, curbp); - } - } else { - state->extravalid = 0; - } - *indexp = index; - return XFS_ERROR(ENOENT); -} - -/* - * Look up a leaf entry in a node-format leaf block. - * If this is an addname then the extrablk in state is a freespace block, - * otherwise it's a data block. - */ -int -xfs_dir2_leafn_lookup_int( - xfs_dabuf_t *bp, /* leaf buffer */ - xfs_da_args_t *args, /* operation arguments */ - int *indexp, /* out: leaf entry index */ - xfs_da_state_t *state) /* state to fill in */ -{ - if (args->op_flags & XFS_DA_OP_ADDNAME) - return xfs_dir2_leafn_lookup_for_addname(bp, args, indexp, - state); - return xfs_dir2_leafn_lookup_for_entry(bp, args, indexp, state); -} - -/* - * Move count leaf entries from source to destination leaf. - * Log entries and headers. Stale entries are preserved. - */ -static void -xfs_dir2_leafn_moveents( - xfs_da_args_t *args, /* operation arguments */ - xfs_dabuf_t *bp_s, /* source leaf buffer */ - int start_s, /* source leaf index */ - xfs_dabuf_t *bp_d, /* destination leaf buffer */ - int start_d, /* destination leaf index */ - int count) /* count of leaves to copy */ -{ - xfs_dir2_leaf_t *leaf_d; /* destination leaf structure */ - xfs_dir2_leaf_t *leaf_s; /* source leaf structure */ - int stale; /* count stale leaves copied */ - xfs_trans_t *tp; /* transaction pointer */ - - trace_xfs_dir2_leafn_moveents(args, start_s, start_d, count); - - /* - * Silently return if nothing to do. - */ - if (count == 0) { - return; - } - tp = args->trans; - leaf_s = bp_s->data; - leaf_d = bp_d->data; - /* - * If the destination index is not the end of the current - * destination leaf entries, open up a hole in the destination - * to hold the new entries. - */ - if (start_d < be16_to_cpu(leaf_d->hdr.count)) { - memmove(&leaf_d->ents[start_d + count], &leaf_d->ents[start_d], - (be16_to_cpu(leaf_d->hdr.count) - start_d) * - sizeof(xfs_dir2_leaf_entry_t)); - xfs_dir2_leaf_log_ents(tp, bp_d, start_d + count, - count + be16_to_cpu(leaf_d->hdr.count) - 1); - } - /* - * If the source has stale leaves, count the ones in the copy range - * so we can update the header correctly. - */ - if (leaf_s->hdr.stale) { - int i; /* temp leaf index */ - - for (i = start_s, stale = 0; i < start_s + count; i++) { - if (leaf_s->ents[i].address == - cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) - stale++; - } - } else - stale = 0; - /* - * Copy the leaf entries from source to destination. - */ - memcpy(&leaf_d->ents[start_d], &leaf_s->ents[start_s], - count * sizeof(xfs_dir2_leaf_entry_t)); - xfs_dir2_leaf_log_ents(tp, bp_d, start_d, start_d + count - 1); - /* - * If there are source entries after the ones we copied, - * delete the ones we copied by sliding the next ones down. - */ - if (start_s + count < be16_to_cpu(leaf_s->hdr.count)) { - memmove(&leaf_s->ents[start_s], &leaf_s->ents[start_s + count], - count * sizeof(xfs_dir2_leaf_entry_t)); - xfs_dir2_leaf_log_ents(tp, bp_s, start_s, start_s + count - 1); - } - /* - * Update the headers and log them. - */ - be16_add_cpu(&leaf_s->hdr.count, -(count)); - be16_add_cpu(&leaf_s->hdr.stale, -(stale)); - be16_add_cpu(&leaf_d->hdr.count, count); - be16_add_cpu(&leaf_d->hdr.stale, stale); - xfs_dir2_leaf_log_header(tp, bp_s); - xfs_dir2_leaf_log_header(tp, bp_d); - xfs_dir2_leafn_check(args->dp, bp_s); - xfs_dir2_leafn_check(args->dp, bp_d); -} - -/* - * Determine the sort order of two leaf blocks. - * Returns 1 if both are valid and leaf2 should be before leaf1, else 0. - */ -int /* sort order */ -xfs_dir2_leafn_order( - xfs_dabuf_t *leaf1_bp, /* leaf1 buffer */ - xfs_dabuf_t *leaf2_bp) /* leaf2 buffer */ -{ - xfs_dir2_leaf_t *leaf1; /* leaf1 structure */ - xfs_dir2_leaf_t *leaf2; /* leaf2 structure */ - - leaf1 = leaf1_bp->data; - leaf2 = leaf2_bp->data; - ASSERT(leaf1->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); - ASSERT(leaf2->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); - if (be16_to_cpu(leaf1->hdr.count) > 0 && - be16_to_cpu(leaf2->hdr.count) > 0 && - (be32_to_cpu(leaf2->ents[0].hashval) < be32_to_cpu(leaf1->ents[0].hashval) || - be32_to_cpu(leaf2->ents[be16_to_cpu(leaf2->hdr.count) - 1].hashval) < - be32_to_cpu(leaf1->ents[be16_to_cpu(leaf1->hdr.count) - 1].hashval))) - return 1; - return 0; -} - -/* - * Rebalance leaf entries between two leaf blocks. - * This is actually only called when the second block is new, - * though the code deals with the general case. - * A new entry will be inserted in one of the blocks, and that - * entry is taken into account when balancing. - */ -static void -xfs_dir2_leafn_rebalance( - xfs_da_state_t *state, /* btree cursor */ - xfs_da_state_blk_t *blk1, /* first btree block */ - xfs_da_state_blk_t *blk2) /* second btree block */ -{ - xfs_da_args_t *args; /* operation arguments */ - int count; /* count (& direction) leaves */ - int isleft; /* new goes in left leaf */ - xfs_dir2_leaf_t *leaf1; /* first leaf structure */ - xfs_dir2_leaf_t *leaf2; /* second leaf structure */ - int mid; /* midpoint leaf index */ -#ifdef DEBUG - int oldstale; /* old count of stale leaves */ -#endif - int oldsum; /* old total leaf count */ - int swap; /* swapped leaf blocks */ - - args = state->args; - /* - * If the block order is wrong, swap the arguments. - */ - if ((swap = xfs_dir2_leafn_order(blk1->bp, blk2->bp))) { - xfs_da_state_blk_t *tmp; /* temp for block swap */ - - tmp = blk1; - blk1 = blk2; - blk2 = tmp; - } - leaf1 = blk1->bp->data; - leaf2 = blk2->bp->data; - oldsum = be16_to_cpu(leaf1->hdr.count) + be16_to_cpu(leaf2->hdr.count); -#ifdef DEBUG - oldstale = be16_to_cpu(leaf1->hdr.stale) + be16_to_cpu(leaf2->hdr.stale); -#endif - mid = oldsum >> 1; - /* - * If the old leaf count was odd then the new one will be even, - * so we need to divide the new count evenly. - */ - if (oldsum & 1) { - xfs_dahash_t midhash; /* middle entry hash value */ - - if (mid >= be16_to_cpu(leaf1->hdr.count)) - midhash = be32_to_cpu(leaf2->ents[mid - be16_to_cpu(leaf1->hdr.count)].hashval); - else - midhash = be32_to_cpu(leaf1->ents[mid].hashval); - isleft = args->hashval <= midhash; - } - /* - * If the old count is even then the new count is odd, so there's - * no preferred side for the new entry. - * Pick the left one. - */ - else - isleft = 1; - /* - * Calculate moved entry count. Positive means left-to-right, - * negative means right-to-left. Then move the entries. - */ - count = be16_to_cpu(leaf1->hdr.count) - mid + (isleft == 0); - if (count > 0) - xfs_dir2_leafn_moveents(args, blk1->bp, - be16_to_cpu(leaf1->hdr.count) - count, blk2->bp, 0, count); - else if (count < 0) - xfs_dir2_leafn_moveents(args, blk2->bp, 0, blk1->bp, - be16_to_cpu(leaf1->hdr.count), count); - ASSERT(be16_to_cpu(leaf1->hdr.count) + be16_to_cpu(leaf2->hdr.count) == oldsum); - ASSERT(be16_to_cpu(leaf1->hdr.stale) + be16_to_cpu(leaf2->hdr.stale) == oldstale); - /* - * Mark whether we're inserting into the old or new leaf. - */ - if (be16_to_cpu(leaf1->hdr.count) < be16_to_cpu(leaf2->hdr.count)) - state->inleaf = swap; - else if (be16_to_cpu(leaf1->hdr.count) > be16_to_cpu(leaf2->hdr.count)) - state->inleaf = !swap; - else - state->inleaf = - swap ^ (blk1->index <= be16_to_cpu(leaf1->hdr.count)); - /* - * Adjust the expected index for insertion. - */ - if (!state->inleaf) - blk2->index = blk1->index - be16_to_cpu(leaf1->hdr.count); - - /* - * Finally sanity check just to make sure we are not returning a - * negative index - */ - if(blk2->index < 0) { - state->inleaf = 1; - blk2->index = 0; - xfs_alert(args->dp->i_mount, - "%s: picked the wrong leaf? reverting original leaf: blk1->index %d\n", - __func__, blk1->index); - } -} - -/* - * Remove an entry from a node directory. - * This removes the leaf entry and the data entry, - * and updates the free block if necessary. - */ -static int /* error */ -xfs_dir2_leafn_remove( - xfs_da_args_t *args, /* operation arguments */ - xfs_dabuf_t *bp, /* leaf buffer */ - int index, /* leaf entry index */ - xfs_da_state_blk_t *dblk, /* data block */ - int *rval) /* resulting block needs join */ -{ - xfs_dir2_data_hdr_t *hdr; /* data block header */ - xfs_dir2_db_t db; /* data block number */ - xfs_dabuf_t *dbp; /* data block buffer */ - xfs_dir2_data_entry_t *dep; /* data block entry */ - xfs_inode_t *dp; /* incore directory inode */ - xfs_dir2_leaf_t *leaf; /* leaf structure */ - xfs_dir2_leaf_entry_t *lep; /* leaf entry */ - int longest; /* longest data free entry */ - int off; /* data block entry offset */ - xfs_mount_t *mp; /* filesystem mount point */ - int needlog; /* need to log data header */ - int needscan; /* need to rescan data frees */ - xfs_trans_t *tp; /* transaction pointer */ - - trace_xfs_dir2_leafn_remove(args, index); - - dp = args->dp; - tp = args->trans; - mp = dp->i_mount; - leaf = bp->data; - ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); - /* - * Point to the entry we're removing. - */ - lep = &leaf->ents[index]; - /* - * Extract the data block and offset from the entry. - */ - db = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address)); - ASSERT(dblk->blkno == db); - off = xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)); - ASSERT(dblk->index == off); - /* - * Kill the leaf entry by marking it stale. - * Log the leaf block changes. - */ - be16_add_cpu(&leaf->hdr.stale, 1); - xfs_dir2_leaf_log_header(tp, bp); - lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR); - xfs_dir2_leaf_log_ents(tp, bp, index, index); - /* - * Make the data entry free. Keep track of the longest freespace - * in the data block in case it changes. - */ - dbp = dblk->bp; - hdr = dbp->data; - dep = (xfs_dir2_data_entry_t *)((char *)hdr + off); - longest = be16_to_cpu(hdr->bestfree[0].length); - needlog = needscan = 0; - xfs_dir2_data_make_free(tp, dbp, off, - xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan); - /* - * Rescan the data block freespaces for bestfree. - * Log the data block header if needed. - */ - if (needscan) - xfs_dir2_data_freescan(mp, hdr, &needlog); - if (needlog) - xfs_dir2_data_log_header(tp, dbp); - xfs_dir2_data_check(dp, dbp); - /* - * If the longest data block freespace changes, need to update - * the corresponding freeblock entry. - */ - if (longest < be16_to_cpu(hdr->bestfree[0].length)) { - int error; /* error return value */ - xfs_dabuf_t *fbp; /* freeblock buffer */ - xfs_dir2_db_t fdb; /* freeblock block number */ - int findex; /* index in freeblock entries */ - xfs_dir2_free_t *free; /* freeblock structure */ - int logfree; /* need to log free entry */ - - /* - * Convert the data block number to a free block, - * read in the free block. - */ - fdb = xfs_dir2_db_to_fdb(mp, db); - if ((error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, fdb), - -1, &fbp, XFS_DATA_FORK))) { - return error; - } - free = fbp->data; - ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); - ASSERT(be32_to_cpu(free->hdr.firstdb) == - xfs_dir2_free_max_bests(mp) * - (fdb - XFS_DIR2_FREE_FIRSTDB(mp))); - /* - * Calculate which entry we need to fix. - */ - findex = xfs_dir2_db_to_fdindex(mp, db); - longest = be16_to_cpu(hdr->bestfree[0].length); - /* - * If the data block is now empty we can get rid of it - * (usually). - */ - if (longest == mp->m_dirblksize - (uint)sizeof(*hdr)) { - /* - * Try to punch out the data block. - */ - error = xfs_dir2_shrink_inode(args, db, dbp); - if (error == 0) { - dblk->bp = NULL; - hdr = NULL; - } - /* - * We can get ENOSPC if there's no space reservation. - * In this case just drop the buffer and some one else - * will eventually get rid of the empty block. - */ - else if (error == ENOSPC && args->total == 0) - xfs_da_buf_done(dbp); - else - return error; - } - /* - * If we got rid of the data block, we can eliminate that entry - * in the free block. - */ - if (hdr == NULL) { - /* - * One less used entry in the free table. - */ - be32_add_cpu(&free->hdr.nused, -1); - xfs_dir2_free_log_header(tp, fbp); - /* - * If this was the last entry in the table, we can - * trim the table size back. There might be other - * entries at the end referring to non-existent - * data blocks, get those too. - */ - if (findex == be32_to_cpu(free->hdr.nvalid) - 1) { - int i; /* free entry index */ - - for (i = findex - 1; - i >= 0 && - free->bests[i] == cpu_to_be16(NULLDATAOFF); - i--) - continue; - free->hdr.nvalid = cpu_to_be32(i + 1); - logfree = 0; - } - /* - * Not the last entry, just punch it out. - */ - else { - free->bests[findex] = cpu_to_be16(NULLDATAOFF); - logfree = 1; - } - /* - * If there are no useful entries left in the block, - * get rid of the block if we can. - */ - if (!free->hdr.nused) { - error = xfs_dir2_shrink_inode(args, fdb, fbp); - if (error == 0) { - fbp = NULL; - logfree = 0; - } else if (error != ENOSPC || args->total != 0) - return error; - /* - * It's possible to get ENOSPC if there is no - * space reservation. In this case some one - * else will eventually get rid of this block. - */ - } - } - /* - * Data block is not empty, just set the free entry to - * the new value. - */ - else { - free->bests[findex] = cpu_to_be16(longest); - logfree = 1; - } - /* - * Log the free entry that changed, unless we got rid of it. - */ - if (logfree) - xfs_dir2_free_log_bests(tp, fbp, findex, findex); - /* - * Drop the buffer if we still have it. - */ - if (fbp) - xfs_da_buf_done(fbp); - } - xfs_dir2_leafn_check(dp, bp); - /* - * Return indication of whether this leaf block is empty enough - * to justify trying to join it with a neighbor. - */ - *rval = - ((uint)sizeof(leaf->hdr) + - (uint)sizeof(leaf->ents[0]) * - (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale))) < - mp->m_dir_magicpct; - return 0; -} - -/* - * Split the leaf entries in the old block into old and new blocks. - */ -int /* error */ -xfs_dir2_leafn_split( - xfs_da_state_t *state, /* btree cursor */ - xfs_da_state_blk_t *oldblk, /* original block */ - xfs_da_state_blk_t *newblk) /* newly created block */ -{ - xfs_da_args_t *args; /* operation arguments */ - xfs_dablk_t blkno; /* new leaf block number */ - int error; /* error return value */ - xfs_mount_t *mp; /* filesystem mount point */ - - /* - * Allocate space for a new leaf node. - */ - args = state->args; - mp = args->dp->i_mount; - ASSERT(args != NULL); - ASSERT(oldblk->magic == XFS_DIR2_LEAFN_MAGIC); - error = xfs_da_grow_inode(args, &blkno); - if (error) { - return error; - } - /* - * Initialize the new leaf block. - */ - error = xfs_dir2_leaf_init(args, xfs_dir2_da_to_db(mp, blkno), - &newblk->bp, XFS_DIR2_LEAFN_MAGIC); - if (error) { - return error; - } - newblk->blkno = blkno; - newblk->magic = XFS_DIR2_LEAFN_MAGIC; - /* - * Rebalance the entries across the two leaves, link the new - * block into the leaves. - */ - xfs_dir2_leafn_rebalance(state, oldblk, newblk); - error = xfs_da_blk_link(state, oldblk, newblk); - if (error) { - return error; - } - /* - * Insert the new entry in the correct block. - */ - if (state->inleaf) - error = xfs_dir2_leafn_add(oldblk->bp, args, oldblk->index); - else - error = xfs_dir2_leafn_add(newblk->bp, args, newblk->index); - /* - * Update last hashval in each block since we added the name. - */ - oldblk->hashval = xfs_dir2_leafn_lasthash(oldblk->bp, NULL); - newblk->hashval = xfs_dir2_leafn_lasthash(newblk->bp, NULL); - xfs_dir2_leafn_check(args->dp, oldblk->bp); - xfs_dir2_leafn_check(args->dp, newblk->bp); - return error; -} - -/* - * 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. - */ -int /* error */ -xfs_dir2_leafn_toosmall( - xfs_da_state_t *state, /* btree cursor */ - int *action) /* resulting action to take */ -{ - xfs_da_state_blk_t *blk; /* leaf block */ - xfs_dablk_t blkno; /* leaf block number */ - xfs_dabuf_t *bp; /* leaf buffer */ - int bytes; /* bytes in use */ - int count; /* leaf live entry count */ - int error; /* error return value */ - int forward; /* sibling block direction */ - int i; /* sibling counter */ - xfs_da_blkinfo_t *info; /* leaf block header */ - xfs_dir2_leaf_t *leaf; /* leaf structure */ - int rval; /* result from path_shift */ - - /* - * Check for the degenerate case of the block being over 50% full. - * If so, it's not worth even looking to see if we might be able - * to coalesce with a sibling. - */ - blk = &state->path.blk[state->path.active - 1]; - info = blk->bp->data; - ASSERT(info->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); - leaf = (xfs_dir2_leaf_t *)info; - count = be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale); - bytes = (uint)sizeof(leaf->hdr) + count * (uint)sizeof(leaf->ents[0]); - if (bytes > (state->blocksize >> 1)) { - /* - * Blk over 50%, don't try to join. - */ - *action = 0; - 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 (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 = (info->forw != 0); - memcpy(&state->altpath, &state->path, sizeof(state->path)); - error = xfs_da_path_shift(state, &state->altpath, forward, 0, - &rval); - if (error) - return error; - *action = rval ? 2 : 0; - 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 a directory over time. - */ - forward = be32_to_cpu(info->forw) < be32_to_cpu(info->back); - for (i = 0, bp = NULL; i < 2; forward = !forward, i++) { - blkno = forward ? be32_to_cpu(info->forw) : be32_to_cpu(info->back); - if (blkno == 0) - continue; - /* - * Read the sibling leaf block. - */ - if ((error = - xfs_da_read_buf(state->args->trans, state->args->dp, blkno, - -1, &bp, XFS_DATA_FORK))) { - return error; - } - ASSERT(bp != NULL); - /* - * Count bytes in the two blocks combined. - */ - leaf = (xfs_dir2_leaf_t *)info; - count = be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale); - bytes = state->blocksize - (state->blocksize >> 2); - leaf = bp->data; - ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); - count += be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale); - bytes -= count * (uint)sizeof(leaf->ents[0]); - /* - * Fits with at least 25% to spare. - */ - if (bytes >= 0) - break; - xfs_da_brelse(state->args->trans, bp); - } - /* - * Didn't like either block, give up. - */ - if (i >= 2) { - *action = 0; - return 0; - } - /* - * Done with the sibling leaf block here, drop the dabuf - * so path_shift can get it. - */ - xfs_da_buf_done(bp); - /* - * Make altpath point to the block we want to keep (the lower - * numbered block) and path point to the block we want to drop. - */ - memcpy(&state->altpath, &state->path, sizeof(state->path)); - if (blkno < blk->blkno) - error = xfs_da_path_shift(state, &state->altpath, forward, 0, - &rval); - else - error = xfs_da_path_shift(state, &state->path, forward, 0, - &rval); - if (error) { - return error; - } - *action = rval ? 0 : 1; - return 0; -} - -/* - * Move all the leaf entries from drop_blk to save_blk. - * This is done as part of a join operation. - */ -void -xfs_dir2_leafn_unbalance( - xfs_da_state_t *state, /* cursor */ - xfs_da_state_blk_t *drop_blk, /* dead block */ - xfs_da_state_blk_t *save_blk) /* surviving block */ -{ - xfs_da_args_t *args; /* operation arguments */ - xfs_dir2_leaf_t *drop_leaf; /* dead leaf structure */ - xfs_dir2_leaf_t *save_leaf; /* surviving leaf structure */ - - args = state->args; - ASSERT(drop_blk->magic == XFS_DIR2_LEAFN_MAGIC); - ASSERT(save_blk->magic == XFS_DIR2_LEAFN_MAGIC); - drop_leaf = drop_blk->bp->data; - save_leaf = save_blk->bp->data; - ASSERT(drop_leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); - ASSERT(save_leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); - /* - * If there are any stale leaf entries, take this opportunity - * to purge them. - */ - if (drop_leaf->hdr.stale) - xfs_dir2_leaf_compact(args, drop_blk->bp); - if (save_leaf->hdr.stale) - xfs_dir2_leaf_compact(args, save_blk->bp); - /* - * Move the entries from drop to the appropriate end of save. - */ - drop_blk->hashval = be32_to_cpu(drop_leaf->ents[be16_to_cpu(drop_leaf->hdr.count) - 1].hashval); - if (xfs_dir2_leafn_order(save_blk->bp, drop_blk->bp)) - xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp, 0, - be16_to_cpu(drop_leaf->hdr.count)); - else - xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp, - be16_to_cpu(save_leaf->hdr.count), be16_to_cpu(drop_leaf->hdr.count)); - save_blk->hashval = be32_to_cpu(save_leaf->ents[be16_to_cpu(save_leaf->hdr.count) - 1].hashval); - xfs_dir2_leafn_check(args->dp, save_blk->bp); -} - -/* - * Top-level node form directory addname routine. - */ -int /* error */ -xfs_dir2_node_addname( - xfs_da_args_t *args) /* operation arguments */ -{ - xfs_da_state_blk_t *blk; /* leaf block for insert */ - int error; /* error return value */ - int rval; /* sub-return value */ - xfs_da_state_t *state; /* btree cursor */ - - trace_xfs_dir2_node_addname(args); - - /* - * Allocate and initialize the state (btree cursor). - */ - state = xfs_da_state_alloc(); - state->args = args; - state->mp = args->dp->i_mount; - state->blocksize = state->mp->m_dirblksize; - state->node_ents = state->mp->m_dir_node_ents; - /* - * Look up the name. We're not supposed to find it, but - * this gives us the insertion point. - */ - error = xfs_da_node_lookup_int(state, &rval); - if (error) - rval = error; - if (rval != ENOENT) { - goto done; - } - /* - * Add the data entry to a data block. - * Extravalid is set to a freeblock found by lookup. - */ - rval = xfs_dir2_node_addname_int(args, - state->extravalid ? &state->extrablk : NULL); - if (rval) { - goto done; - } - blk = &state->path.blk[state->path.active - 1]; - ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); - /* - * Add the new leaf entry. - */ - rval = xfs_dir2_leafn_add(blk->bp, args, blk->index); - if (rval == 0) { - /* - * It worked, fix the hash values up the btree. - */ - if (!(args->op_flags & XFS_DA_OP_JUSTCHECK)) - xfs_da_fixhashpath(state, &state->path); - } else { - /* - * It didn't work, we need to split the leaf block. - */ - if (args->total == 0) { - ASSERT(rval == ENOSPC); - goto done; - } - /* - * Split the leaf block and insert the new entry. - */ - rval = xfs_da_split(state); - } -done: - xfs_da_state_free(state); - return rval; -} - -/* - * Add the data entry for a node-format directory name addition. - * The leaf entry is added in xfs_dir2_leafn_add. - * We may enter with a freespace block that the lookup found. - */ -static int /* error */ -xfs_dir2_node_addname_int( - xfs_da_args_t *args, /* operation arguments */ - xfs_da_state_blk_t *fblk) /* optional freespace block */ -{ - xfs_dir2_data_hdr_t *hdr; /* data block header */ - xfs_dir2_db_t dbno; /* data block number */ - xfs_dabuf_t *dbp; /* data block buffer */ - xfs_dir2_data_entry_t *dep; /* data entry pointer */ - xfs_inode_t *dp; /* incore directory inode */ - xfs_dir2_data_unused_t *dup; /* data unused entry pointer */ - int error; /* error return value */ - xfs_dir2_db_t fbno; /* freespace block number */ - xfs_dabuf_t *fbp; /* freespace buffer */ - int findex; /* freespace entry index */ - xfs_dir2_free_t *free=NULL; /* freespace block structure */ - xfs_dir2_db_t ifbno; /* initial freespace block no */ - xfs_dir2_db_t lastfbno=0; /* highest freespace block no */ - int length; /* length of the new entry */ - int logfree; /* need to log free entry */ - xfs_mount_t *mp; /* filesystem mount point */ - int needlog; /* need to log data header */ - int needscan; /* need to rescan data frees */ - __be16 *tagp; /* data entry tag pointer */ - xfs_trans_t *tp; /* transaction pointer */ - - dp = args->dp; - mp = dp->i_mount; - tp = args->trans; - length = xfs_dir2_data_entsize(args->namelen); - /* - * If we came in with a freespace block that means that lookup - * found an entry with our hash value. This is the freespace - * block for that data entry. - */ - if (fblk) { - fbp = fblk->bp; - /* - * Remember initial freespace block number. - */ - ifbno = fblk->blkno; - free = fbp->data; - ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); - findex = fblk->index; - /* - * This means the free entry showed that the data block had - * space for our entry, so we remembered it. - * Use that data block. - */ - if (findex >= 0) { - ASSERT(findex < be32_to_cpu(free->hdr.nvalid)); - ASSERT(be16_to_cpu(free->bests[findex]) != NULLDATAOFF); - ASSERT(be16_to_cpu(free->bests[findex]) >= length); - dbno = be32_to_cpu(free->hdr.firstdb) + findex; - } - /* - * The data block looked at didn't have enough room. - * We'll start at the beginning of the freespace entries. - */ - else { - dbno = -1; - findex = 0; - } - } - /* - * Didn't come in with a freespace block, so don't have a data block. - */ - else { - ifbno = dbno = -1; - fbp = NULL; - findex = 0; - } - /* - * If we don't have a data block yet, we're going to scan the - * freespace blocks looking for one. Figure out what the - * highest freespace block number is. - */ - if (dbno == -1) { - xfs_fileoff_t fo; /* freespace block number */ - - if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) - return error; - lastfbno = xfs_dir2_da_to_db(mp, (xfs_dablk_t)fo); - fbno = ifbno; - } - /* - * While we haven't identified a data block, search the freeblock - * data for a good data block. If we find a null freeblock entry, - * indicating a hole in the data blocks, remember that. - */ - while (dbno == -1) { - /* - * If we don't have a freeblock in hand, get the next one. - */ - if (fbp == NULL) { - /* - * Happens the first time through unless lookup gave - * us a freespace block to start with. - */ - if (++fbno == 0) - fbno = XFS_DIR2_FREE_FIRSTDB(mp); - /* - * If it's ifbno we already looked at it. - */ - if (fbno == ifbno) - fbno++; - /* - * If it's off the end we're done. - */ - if (fbno >= lastfbno) - break; - /* - * Read the block. There can be holes in the - * freespace blocks, so this might not succeed. - * This should be really rare, so there's no reason - * to avoid it. - */ - if ((error = xfs_da_read_buf(tp, dp, - xfs_dir2_db_to_da(mp, fbno), -2, &fbp, - XFS_DATA_FORK))) { - return error; - } - if (unlikely(fbp == NULL)) { - continue; - } - free = fbp->data; - ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); - findex = 0; - } - /* - * Look at the current free entry. Is it good enough? - */ - if (be16_to_cpu(free->bests[findex]) != NULLDATAOFF && - be16_to_cpu(free->bests[findex]) >= length) - dbno = be32_to_cpu(free->hdr.firstdb) + findex; - else { - /* - * Are we done with the freeblock? - */ - if (++findex == be32_to_cpu(free->hdr.nvalid)) { - /* - * Drop the block. - */ - xfs_da_brelse(tp, fbp); - fbp = NULL; - if (fblk && fblk->bp) - fblk->bp = NULL; - } - } - } - /* - * If we don't have a data block, we need to allocate one and make - * the freespace entries refer to it. - */ - if (unlikely(dbno == -1)) { - /* - * Not allowed to allocate, return failure. - */ - if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || - args->total == 0) { - /* - * Drop the freespace buffer unless it came from our - * caller. - */ - if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) - xfs_da_buf_done(fbp); - return XFS_ERROR(ENOSPC); - } - /* - * Allocate and initialize the new data block. - */ - if (unlikely((error = xfs_dir2_grow_inode(args, - XFS_DIR2_DATA_SPACE, - &dbno)) || - (error = xfs_dir2_data_init(args, dbno, &dbp)))) { - /* - * Drop the freespace buffer unless it came from our - * caller. - */ - if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) - xfs_da_buf_done(fbp); - return error; - } - /* - * If (somehow) we have a freespace block, get rid of it. - */ - if (fbp) - xfs_da_brelse(tp, fbp); - if (fblk && fblk->bp) - fblk->bp = NULL; - - /* - * Get the freespace block corresponding to the data block - * that was just allocated. - */ - fbno = xfs_dir2_db_to_fdb(mp, dbno); - if (unlikely(error = xfs_da_read_buf(tp, dp, - xfs_dir2_db_to_da(mp, fbno), -2, &fbp, - XFS_DATA_FORK))) { - xfs_da_buf_done(dbp); - return error; - } - /* - * If there wasn't a freespace block, the read will - * return a NULL fbp. Allocate and initialize a new one. - */ - if( fbp == NULL ) { - if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, - &fbno))) { - return error; - } - - if (unlikely(xfs_dir2_db_to_fdb(mp, dbno) != fbno)) { - xfs_alert(mp, - "%s: dir ino %llu needed freesp block %lld for\n" - " data block %lld, got %lld ifbno %llu lastfbno %d", - __func__, (unsigned long long)dp->i_ino, - (long long)xfs_dir2_db_to_fdb(mp, dbno), - (long long)dbno, (long long)fbno, - (unsigned long long)ifbno, lastfbno); - if (fblk) { - xfs_alert(mp, - " fblk 0x%p blkno %llu index %d magic 0x%x", - fblk, - (unsigned long long)fblk->blkno, - fblk->index, - fblk->magic); - } else { - xfs_alert(mp, " ... fblk is NULL"); - } - XFS_ERROR_REPORT("xfs_dir2_node_addname_int", - XFS_ERRLEVEL_LOW, mp); - return XFS_ERROR(EFSCORRUPTED); - } - - /* - * Get a buffer for the new block. - */ - if ((error = xfs_da_get_buf(tp, dp, - xfs_dir2_db_to_da(mp, fbno), - -1, &fbp, XFS_DATA_FORK))) { - return error; - } - ASSERT(fbp != NULL); - - /* - * Initialize the new block to be empty, and remember - * its first slot as our empty slot. - */ - free = fbp->data; - free->hdr.magic = cpu_to_be32(XFS_DIR2_FREE_MAGIC); - free->hdr.firstdb = cpu_to_be32( - (fbno - XFS_DIR2_FREE_FIRSTDB(mp)) * - xfs_dir2_free_max_bests(mp)); - free->hdr.nvalid = 0; - free->hdr.nused = 0; - } else { - free = fbp->data; - ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); - } - - /* - * Set the freespace block index from the data block number. - */ - findex = xfs_dir2_db_to_fdindex(mp, dbno); - /* - * If it's after the end of the current entries in the - * freespace block, extend that table. - */ - if (findex >= be32_to_cpu(free->hdr.nvalid)) { - ASSERT(findex < xfs_dir2_free_max_bests(mp)); - free->hdr.nvalid = cpu_to_be32(findex + 1); - /* - * Tag new entry so nused will go up. - */ - free->bests[findex] = cpu_to_be16(NULLDATAOFF); - } - /* - * If this entry was for an empty data block - * (this should always be true) then update the header. - */ - if (free->bests[findex] == cpu_to_be16(NULLDATAOFF)) { - be32_add_cpu(&free->hdr.nused, 1); - xfs_dir2_free_log_header(tp, fbp); - } - /* - * Update the real value in the table. - * We haven't allocated the data entry yet so this will - * change again. - */ - hdr = dbp->data; - free->bests[findex] = hdr->bestfree[0].length; - logfree = 1; - } - /* - * We had a data block so we don't have to make a new one. - */ - else { - /* - * If just checking, we succeeded. - */ - if (args->op_flags & XFS_DA_OP_JUSTCHECK) { - if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) - xfs_da_buf_done(fbp); - return 0; - } - /* - * Read the data block in. - */ - if (unlikely( - error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, dbno), - -1, &dbp, XFS_DATA_FORK))) { - if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) - xfs_da_buf_done(fbp); - return error; - } - hdr = dbp->data; - logfree = 0; - } - ASSERT(be16_to_cpu(hdr->bestfree[0].length) >= length); - /* - * Point to the existing unused space. - */ - dup = (xfs_dir2_data_unused_t *) - ((char *)hdr + be16_to_cpu(hdr->bestfree[0].offset)); - needscan = needlog = 0; - /* - * Mark the first part of the unused space, inuse for us. - */ - xfs_dir2_data_use_free(tp, dbp, dup, - (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length, - &needlog, &needscan); - /* - * Fill in the new entry and log it. - */ - 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); - tagp = xfs_dir2_data_entry_tag_p(dep); - *tagp = cpu_to_be16((char *)dep - (char *)hdr); - xfs_dir2_data_log_entry(tp, dbp, dep); - /* - * Rescan the block for bestfree if needed. - */ - if (needscan) - xfs_dir2_data_freescan(mp, hdr, &needlog); - /* - * Log the data block header if needed. - */ - if (needlog) - xfs_dir2_data_log_header(tp, dbp); - /* - * If the freespace entry is now wrong, update it. - */ - if (be16_to_cpu(free->bests[findex]) != be16_to_cpu(hdr->bestfree[0].length)) { - free->bests[findex] = hdr->bestfree[0].length; - logfree = 1; - } - /* - * Log the freespace entry if needed. - */ - if (logfree) - xfs_dir2_free_log_bests(tp, fbp, findex, findex); - /* - * If the caller didn't hand us the freespace block, drop it. - */ - if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL) - xfs_da_buf_done(fbp); - /* - * Return the data block and offset in args, then drop the data block. - */ - args->blkno = (xfs_dablk_t)dbno; - args->index = be16_to_cpu(*tagp); - xfs_da_buf_done(dbp); - return 0; -} - -/* - * Lookup an entry in a node-format directory. - * All the real work happens in xfs_da_node_lookup_int. - * The only real output is the inode number of the entry. - */ -int /* error */ -xfs_dir2_node_lookup( - xfs_da_args_t *args) /* operation arguments */ -{ - int error; /* error return value */ - int i; /* btree level */ - int rval; /* operation return value */ - xfs_da_state_t *state; /* btree cursor */ - - trace_xfs_dir2_node_lookup(args); - - /* - * Allocate and initialize the btree cursor. - */ - state = xfs_da_state_alloc(); - state->args = args; - state->mp = args->dp->i_mount; - state->blocksize = state->mp->m_dirblksize; - state->node_ents = state->mp->m_dir_node_ents; - /* - * Fill in the path to the entry in the cursor. - */ - error = xfs_da_node_lookup_int(state, &rval); - if (error) - rval = error; - else if (rval == ENOENT && args->cmpresult == XFS_CMP_CASE) { - /* If a CI match, dup the actual name and return EEXIST */ - xfs_dir2_data_entry_t *dep; - - dep = (xfs_dir2_data_entry_t *)((char *)state->extrablk.bp-> - data + state->extrablk.index); - rval = xfs_dir_cilookup_result(args, dep->name, dep->namelen); - } - /* - * Release the btree blocks and leaf block. - */ - for (i = 0; i < state->path.active; i++) { - xfs_da_brelse(args->trans, state->path.blk[i].bp); - state->path.blk[i].bp = NULL; - } - /* - * Release the data block if we have it. - */ - if (state->extravalid && state->extrablk.bp) { - xfs_da_brelse(args->trans, state->extrablk.bp); - state->extrablk.bp = NULL; - } - xfs_da_state_free(state); - return rval; -} - -/* - * Remove an entry from a node-format directory. - */ -int /* error */ -xfs_dir2_node_removename( - xfs_da_args_t *args) /* operation arguments */ -{ - xfs_da_state_blk_t *blk; /* leaf block */ - int error; /* error return value */ - int rval; /* operation return value */ - xfs_da_state_t *state; /* btree cursor */ - - trace_xfs_dir2_node_removename(args); - - /* - * Allocate and initialize the btree cursor. - */ - state = xfs_da_state_alloc(); - state->args = args; - state->mp = args->dp->i_mount; - state->blocksize = state->mp->m_dirblksize; - state->node_ents = state->mp->m_dir_node_ents; - /* - * Look up the entry we're deleting, set up the cursor. - */ - error = xfs_da_node_lookup_int(state, &rval); - if (error) - rval = error; - /* - * Didn't find it, upper layer screwed up. - */ - if (rval != EEXIST) { - xfs_da_state_free(state); - return rval; - } - blk = &state->path.blk[state->path.active - 1]; - ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); - ASSERT(state->extravalid); - /* - * Remove the leaf and data entries. - * Extrablk refers to the data block. - */ - error = xfs_dir2_leafn_remove(args, blk->bp, blk->index, - &state->extrablk, &rval); - if (error) - return error; - /* - * Fix the hash values up the btree. - */ - xfs_da_fixhashpath(state, &state->path); - /* - * If we need to join leaf blocks, do it. - */ - if (rval && state->path.active > 1) - error = xfs_da_join(state); - /* - * If no errors so far, try conversion to leaf format. - */ - if (!error) - error = xfs_dir2_node_to_leaf(state); - xfs_da_state_free(state); - return error; -} - -/* - * Replace an entry's inode number in a node-format directory. - */ -int /* error */ -xfs_dir2_node_replace( - xfs_da_args_t *args) /* operation arguments */ -{ - xfs_da_state_blk_t *blk; /* leaf block */ - xfs_dir2_data_hdr_t *hdr; /* data block header */ - xfs_dir2_data_entry_t *dep; /* data entry changed */ - int error; /* error return value */ - int i; /* btree level */ - xfs_ino_t inum; /* new inode number */ - xfs_dir2_leaf_t *leaf; /* leaf structure */ - xfs_dir2_leaf_entry_t *lep; /* leaf entry being changed */ - int rval; /* internal return value */ - xfs_da_state_t *state; /* btree cursor */ - - trace_xfs_dir2_node_replace(args); - - /* - * Allocate and initialize the btree cursor. - */ - state = xfs_da_state_alloc(); - state->args = args; - state->mp = args->dp->i_mount; - state->blocksize = state->mp->m_dirblksize; - state->node_ents = state->mp->m_dir_node_ents; - inum = args->inumber; - /* - * Lookup the entry to change in the btree. - */ - error = xfs_da_node_lookup_int(state, &rval); - if (error) { - rval = error; - } - /* - * It should be found, since the vnodeops layer has looked it up - * and locked it. But paranoia is good. - */ - if (rval == EEXIST) { - /* - * Find the leaf entry. - */ - blk = &state->path.blk[state->path.active - 1]; - ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC); - leaf = blk->bp->data; - lep = &leaf->ents[blk->index]; - ASSERT(state->extravalid); - /* - * Point to the data entry. - */ - hdr = state->extrablk.bp->data; - ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC)); - dep = (xfs_dir2_data_entry_t *) - ((char *)hdr + - xfs_dir2_dataptr_to_off(state->mp, be32_to_cpu(lep->address))); - ASSERT(inum != be64_to_cpu(dep->inumber)); - /* - * Fill in the new inode number and log the entry. - */ - dep->inumber = cpu_to_be64(inum); - xfs_dir2_data_log_entry(args->trans, state->extrablk.bp, dep); - rval = 0; - } - /* - * Didn't find it, and we're holding a data block. Drop it. - */ - else if (state->extravalid) { - xfs_da_brelse(args->trans, state->extrablk.bp); - state->extrablk.bp = NULL; - } - /* - * Release all the buffers in the cursor. - */ - for (i = 0; i < state->path.active; i++) { - xfs_da_brelse(args->trans, state->path.blk[i].bp); - state->path.blk[i].bp = NULL; - } - xfs_da_state_free(state); - return rval; -} - -/* - * Trim off a trailing empty freespace block. - * Return (in rvalp) 1 if we did it, 0 if not. - */ -int /* error */ -xfs_dir2_node_trim_free( - xfs_da_args_t *args, /* operation arguments */ - xfs_fileoff_t fo, /* free block number */ - int *rvalp) /* out: did something */ -{ - xfs_dabuf_t *bp; /* freespace buffer */ - xfs_inode_t *dp; /* incore directory inode */ - int error; /* error return code */ - xfs_dir2_free_t *free; /* freespace structure */ - xfs_mount_t *mp; /* filesystem mount point */ - xfs_trans_t *tp; /* transaction pointer */ - - dp = args->dp; - mp = dp->i_mount; - tp = args->trans; - /* - * Read the freespace block. - */ - if (unlikely(error = xfs_da_read_buf(tp, dp, (xfs_dablk_t)fo, -2, &bp, - XFS_DATA_FORK))) { - return error; - } - - /* - * There can be holes in freespace. If fo is a hole, there's - * nothing to do. - */ - if (bp == NULL) { - return 0; - } - free = bp->data; - ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)); - /* - * If there are used entries, there's nothing to do. - */ - if (be32_to_cpu(free->hdr.nused) > 0) { - xfs_da_brelse(tp, bp); - *rvalp = 0; - return 0; - } - /* - * Blow the block away. - */ - if ((error = - xfs_dir2_shrink_inode(args, xfs_dir2_da_to_db(mp, (xfs_dablk_t)fo), - bp))) { - /* - * Can't fail with ENOSPC since that only happens with no - * space reservation, when breaking up an extent into two - * pieces. This is the last block of an extent. - */ - ASSERT(error != ENOSPC); - xfs_da_brelse(tp, bp); - return error; - } - /* - * Return that we succeeded. - */ - *rvalp = 1; - return 0; -} |