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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (c) 2000-2005 Silicon Graphics, Inc.
- * Copyright (c) 2013 Red Hat, Inc.
- * All Rights Reserved.
- */
- #include "xfs.h"
- #include "xfs_fs.h"
- #include "xfs_shared.h"
- #include "xfs_format.h"
- #include "xfs_log_format.h"
- #include "xfs_trans_resv.h"
- #include "xfs_bit.h"
- #include "xfs_mount.h"
- #include "xfs_inode.h"
- #include "xfs_dir2.h"
- #include "xfs_dir2_priv.h"
- #include "xfs_trans.h"
- #include "xfs_bmap.h"
- #include "xfs_attr_leaf.h"
- #include "xfs_error.h"
- #include "xfs_trace.h"
- #include "xfs_buf_item.h"
- #include "xfs_log.h"
- #include "xfs_errortag.h"
- /*
- * xfs_da_btree.c
- *
- * Routines to implement directories as Btrees of hashed names.
- */
- /*========================================================================
- * Function prototypes for the kernel.
- *========================================================================*/
- /*
- * Routines used for growing the Btree.
- */
- STATIC int xfs_da3_root_split(xfs_da_state_t *state,
- xfs_da_state_blk_t *existing_root,
- xfs_da_state_blk_t *new_child);
- STATIC int xfs_da3_node_split(xfs_da_state_t *state,
- xfs_da_state_blk_t *existing_blk,
- xfs_da_state_blk_t *split_blk,
- xfs_da_state_blk_t *blk_to_add,
- int treelevel,
- int *result);
- STATIC void xfs_da3_node_rebalance(xfs_da_state_t *state,
- xfs_da_state_blk_t *node_blk_1,
- xfs_da_state_blk_t *node_blk_2);
- STATIC void xfs_da3_node_add(xfs_da_state_t *state,
- xfs_da_state_blk_t *old_node_blk,
- xfs_da_state_blk_t *new_node_blk);
- /*
- * Routines used for shrinking the Btree.
- */
- STATIC int xfs_da3_root_join(xfs_da_state_t *state,
- xfs_da_state_blk_t *root_blk);
- STATIC int xfs_da3_node_toosmall(xfs_da_state_t *state, int *retval);
- STATIC void xfs_da3_node_remove(xfs_da_state_t *state,
- xfs_da_state_blk_t *drop_blk);
- STATIC void xfs_da3_node_unbalance(xfs_da_state_t *state,
- xfs_da_state_blk_t *src_node_blk,
- xfs_da_state_blk_t *dst_node_blk);
- /*
- * Utility routines.
- */
- STATIC int xfs_da3_blk_unlink(xfs_da_state_t *state,
- xfs_da_state_blk_t *drop_blk,
- xfs_da_state_blk_t *save_blk);
- struct kmem_cache *xfs_da_state_cache; /* anchor for dir/attr state */
- /*
- * Allocate a dir-state structure.
- * We don't put them on the stack since they're large.
- */
- struct xfs_da_state *
- xfs_da_state_alloc(
- struct xfs_da_args *args)
- {
- struct xfs_da_state *state;
- state = kmem_cache_zalloc(xfs_da_state_cache, GFP_NOFS | __GFP_NOFAIL);
- state->args = args;
- state->mp = args->dp->i_mount;
- return state;
- }
- /*
- * Kill the altpath contents of a da-state structure.
- */
- STATIC void
- xfs_da_state_kill_altpath(xfs_da_state_t *state)
- {
- int i;
- for (i = 0; i < state->altpath.active; i++)
- state->altpath.blk[i].bp = NULL;
- state->altpath.active = 0;
- }
- /*
- * Free a da-state structure.
- */
- void
- xfs_da_state_free(xfs_da_state_t *state)
- {
- xfs_da_state_kill_altpath(state);
- #ifdef DEBUG
- memset((char *)state, 0, sizeof(*state));
- #endif /* DEBUG */
- kmem_cache_free(xfs_da_state_cache, state);
- }
- void
- xfs_da_state_reset(
- struct xfs_da_state *state,
- struct xfs_da_args *args)
- {
- xfs_da_state_kill_altpath(state);
- memset(state, 0, sizeof(struct xfs_da_state));
- state->args = args;
- state->mp = state->args->dp->i_mount;
- }
- static inline int xfs_dabuf_nfsb(struct xfs_mount *mp, int whichfork)
- {
- if (whichfork == XFS_DATA_FORK)
- return mp->m_dir_geo->fsbcount;
- return mp->m_attr_geo->fsbcount;
- }
- void
- xfs_da3_node_hdr_from_disk(
- struct xfs_mount *mp,
- struct xfs_da3_icnode_hdr *to,
- struct xfs_da_intnode *from)
- {
- if (xfs_has_crc(mp)) {
- struct xfs_da3_intnode *from3 = (struct xfs_da3_intnode *)from;
- to->forw = be32_to_cpu(from3->hdr.info.hdr.forw);
- to->back = be32_to_cpu(from3->hdr.info.hdr.back);
- to->magic = be16_to_cpu(from3->hdr.info.hdr.magic);
- to->count = be16_to_cpu(from3->hdr.__count);
- to->level = be16_to_cpu(from3->hdr.__level);
- to->btree = from3->__btree;
- ASSERT(to->magic == XFS_DA3_NODE_MAGIC);
- } else {
- to->forw = be32_to_cpu(from->hdr.info.forw);
- to->back = be32_to_cpu(from->hdr.info.back);
- to->magic = be16_to_cpu(from->hdr.info.magic);
- to->count = be16_to_cpu(from->hdr.__count);
- to->level = be16_to_cpu(from->hdr.__level);
- to->btree = from->__btree;
- ASSERT(to->magic == XFS_DA_NODE_MAGIC);
- }
- }
- void
- xfs_da3_node_hdr_to_disk(
- struct xfs_mount *mp,
- struct xfs_da_intnode *to,
- struct xfs_da3_icnode_hdr *from)
- {
- if (xfs_has_crc(mp)) {
- struct xfs_da3_intnode *to3 = (struct xfs_da3_intnode *)to;
- ASSERT(from->magic == XFS_DA3_NODE_MAGIC);
- to3->hdr.info.hdr.forw = cpu_to_be32(from->forw);
- to3->hdr.info.hdr.back = cpu_to_be32(from->back);
- to3->hdr.info.hdr.magic = cpu_to_be16(from->magic);
- to3->hdr.__count = cpu_to_be16(from->count);
- to3->hdr.__level = cpu_to_be16(from->level);
- } else {
- ASSERT(from->magic == XFS_DA_NODE_MAGIC);
- to->hdr.info.forw = cpu_to_be32(from->forw);
- to->hdr.info.back = cpu_to_be32(from->back);
- to->hdr.info.magic = cpu_to_be16(from->magic);
- to->hdr.__count = cpu_to_be16(from->count);
- to->hdr.__level = cpu_to_be16(from->level);
- }
- }
- /*
- * Verify an xfs_da3_blkinfo structure. Note that the da3 fields are only
- * accessible on v5 filesystems. This header format is common across da node,
- * attr leaf and dir leaf blocks.
- */
- xfs_failaddr_t
- xfs_da3_blkinfo_verify(
- struct xfs_buf *bp,
- struct xfs_da3_blkinfo *hdr3)
- {
- struct xfs_mount *mp = bp->b_mount;
- struct xfs_da_blkinfo *hdr = &hdr3->hdr;
- if (!xfs_verify_magic16(bp, hdr->magic))
- return __this_address;
- if (xfs_has_crc(mp)) {
- if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
- return __this_address;
- if (be64_to_cpu(hdr3->blkno) != xfs_buf_daddr(bp))
- return __this_address;
- if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn)))
- return __this_address;
- }
- return NULL;
- }
- static xfs_failaddr_t
- xfs_da3_node_verify(
- struct xfs_buf *bp)
- {
- struct xfs_mount *mp = bp->b_mount;
- struct xfs_da_intnode *hdr = bp->b_addr;
- struct xfs_da3_icnode_hdr ichdr;
- xfs_failaddr_t fa;
- xfs_da3_node_hdr_from_disk(mp, &ichdr, hdr);
- fa = xfs_da3_blkinfo_verify(bp, bp->b_addr);
- if (fa)
- return fa;
- if (ichdr.level == 0)
- return __this_address;
- if (ichdr.level > XFS_DA_NODE_MAXDEPTH)
- return __this_address;
- if (ichdr.count == 0)
- return __this_address;
- /*
- * we don't know if the node is for and attribute or directory tree,
- * so only fail if the count is outside both bounds
- */
- if (ichdr.count > mp->m_dir_geo->node_ents &&
- ichdr.count > mp->m_attr_geo->node_ents)
- return __this_address;
- /* XXX: hash order check? */
- return NULL;
- }
- static void
- xfs_da3_node_write_verify(
- struct xfs_buf *bp)
- {
- struct xfs_mount *mp = bp->b_mount;
- struct xfs_buf_log_item *bip = bp->b_log_item;
- struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
- xfs_failaddr_t fa;
- fa = xfs_da3_node_verify(bp);
- if (fa) {
- xfs_verifier_error(bp, -EFSCORRUPTED, fa);
- return;
- }
- if (!xfs_has_crc(mp))
- return;
- if (bip)
- hdr3->info.lsn = cpu_to_be64(bip->bli_item.li_lsn);
- xfs_buf_update_cksum(bp, XFS_DA3_NODE_CRC_OFF);
- }
- /*
- * leaf/node format detection on trees is sketchy, so a node read can be done on
- * leaf level blocks when detection identifies the tree as a node format tree
- * incorrectly. In this case, we need to swap the verifier to match the correct
- * format of the block being read.
- */
- static void
- xfs_da3_node_read_verify(
- struct xfs_buf *bp)
- {
- struct xfs_da_blkinfo *info = bp->b_addr;
- xfs_failaddr_t fa;
- switch (be16_to_cpu(info->magic)) {
- case XFS_DA3_NODE_MAGIC:
- if (!xfs_buf_verify_cksum(bp, XFS_DA3_NODE_CRC_OFF)) {
- xfs_verifier_error(bp, -EFSBADCRC,
- __this_address);
- break;
- }
- fallthrough;
- case XFS_DA_NODE_MAGIC:
- fa = xfs_da3_node_verify(bp);
- if (fa)
- xfs_verifier_error(bp, -EFSCORRUPTED, fa);
- return;
- case XFS_ATTR_LEAF_MAGIC:
- case XFS_ATTR3_LEAF_MAGIC:
- bp->b_ops = &xfs_attr3_leaf_buf_ops;
- bp->b_ops->verify_read(bp);
- return;
- case XFS_DIR2_LEAFN_MAGIC:
- case XFS_DIR3_LEAFN_MAGIC:
- bp->b_ops = &xfs_dir3_leafn_buf_ops;
- bp->b_ops->verify_read(bp);
- return;
- default:
- xfs_verifier_error(bp, -EFSCORRUPTED, __this_address);
- break;
- }
- }
- /* Verify the structure of a da3 block. */
- static xfs_failaddr_t
- xfs_da3_node_verify_struct(
- struct xfs_buf *bp)
- {
- struct xfs_da_blkinfo *info = bp->b_addr;
- switch (be16_to_cpu(info->magic)) {
- case XFS_DA3_NODE_MAGIC:
- case XFS_DA_NODE_MAGIC:
- return xfs_da3_node_verify(bp);
- case XFS_ATTR_LEAF_MAGIC:
- case XFS_ATTR3_LEAF_MAGIC:
- bp->b_ops = &xfs_attr3_leaf_buf_ops;
- return bp->b_ops->verify_struct(bp);
- case XFS_DIR2_LEAFN_MAGIC:
- case XFS_DIR3_LEAFN_MAGIC:
- bp->b_ops = &xfs_dir3_leafn_buf_ops;
- return bp->b_ops->verify_struct(bp);
- default:
- return __this_address;
- }
- }
- const struct xfs_buf_ops xfs_da3_node_buf_ops = {
- .name = "xfs_da3_node",
- .magic16 = { cpu_to_be16(XFS_DA_NODE_MAGIC),
- cpu_to_be16(XFS_DA3_NODE_MAGIC) },
- .verify_read = xfs_da3_node_read_verify,
- .verify_write = xfs_da3_node_write_verify,
- .verify_struct = xfs_da3_node_verify_struct,
- };
- static int
- xfs_da3_node_set_type(
- struct xfs_trans *tp,
- struct xfs_buf *bp)
- {
- struct xfs_da_blkinfo *info = bp->b_addr;
- switch (be16_to_cpu(info->magic)) {
- case XFS_DA_NODE_MAGIC:
- case XFS_DA3_NODE_MAGIC:
- xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DA_NODE_BUF);
- return 0;
- case XFS_ATTR_LEAF_MAGIC:
- case XFS_ATTR3_LEAF_MAGIC:
- xfs_trans_buf_set_type(tp, bp, XFS_BLFT_ATTR_LEAF_BUF);
- return 0;
- case XFS_DIR2_LEAFN_MAGIC:
- case XFS_DIR3_LEAFN_MAGIC:
- xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAFN_BUF);
- return 0;
- default:
- XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, tp->t_mountp,
- info, sizeof(*info));
- xfs_trans_brelse(tp, bp);
- return -EFSCORRUPTED;
- }
- }
- int
- xfs_da3_node_read(
- struct xfs_trans *tp,
- struct xfs_inode *dp,
- xfs_dablk_t bno,
- struct xfs_buf **bpp,
- int whichfork)
- {
- int error;
- error = xfs_da_read_buf(tp, dp, bno, 0, bpp, whichfork,
- &xfs_da3_node_buf_ops);
- if (error || !*bpp || !tp)
- return error;
- return xfs_da3_node_set_type(tp, *bpp);
- }
- int
- xfs_da3_node_read_mapped(
- struct xfs_trans *tp,
- struct xfs_inode *dp,
- xfs_daddr_t mappedbno,
- struct xfs_buf **bpp,
- int whichfork)
- {
- struct xfs_mount *mp = dp->i_mount;
- int error;
- error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, mappedbno,
- XFS_FSB_TO_BB(mp, xfs_dabuf_nfsb(mp, whichfork)), 0,
- bpp, &xfs_da3_node_buf_ops);
- if (error || !*bpp)
- return error;
- if (whichfork == XFS_ATTR_FORK)
- xfs_buf_set_ref(*bpp, XFS_ATTR_BTREE_REF);
- else
- xfs_buf_set_ref(*bpp, XFS_DIR_BTREE_REF);
- if (!tp)
- return 0;
- return xfs_da3_node_set_type(tp, *bpp);
- }
- /*========================================================================
- * Routines used for growing the Btree.
- *========================================================================*/
- /*
- * Create the initial contents of an intermediate node.
- */
- int
- xfs_da3_node_create(
- struct xfs_da_args *args,
- xfs_dablk_t blkno,
- int level,
- struct xfs_buf **bpp,
- int whichfork)
- {
- struct xfs_da_intnode *node;
- struct xfs_trans *tp = args->trans;
- struct xfs_mount *mp = tp->t_mountp;
- struct xfs_da3_icnode_hdr ichdr = {0};
- struct xfs_buf *bp;
- int error;
- struct xfs_inode *dp = args->dp;
- trace_xfs_da_node_create(args);
- ASSERT(level <= XFS_DA_NODE_MAXDEPTH);
- error = xfs_da_get_buf(tp, dp, blkno, &bp, whichfork);
- if (error)
- return error;
- bp->b_ops = &xfs_da3_node_buf_ops;
- xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DA_NODE_BUF);
- node = bp->b_addr;
- if (xfs_has_crc(mp)) {
- struct xfs_da3_node_hdr *hdr3 = bp->b_addr;
- memset(hdr3, 0, sizeof(struct xfs_da3_node_hdr));
- ichdr.magic = XFS_DA3_NODE_MAGIC;
- hdr3->info.blkno = cpu_to_be64(xfs_buf_daddr(bp));
- hdr3->info.owner = cpu_to_be64(args->dp->i_ino);
- uuid_copy(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid);
- } else {
- ichdr.magic = XFS_DA_NODE_MAGIC;
- }
- ichdr.level = level;
- xfs_da3_node_hdr_to_disk(dp->i_mount, node, &ichdr);
- xfs_trans_log_buf(tp, bp,
- XFS_DA_LOGRANGE(node, &node->hdr, args->geo->node_hdr_size));
- *bpp = bp;
- return 0;
- }
- /*
- * Split a leaf node, rebalance, then possibly split
- * intermediate nodes, rebalance, etc.
- */
- int /* error */
- xfs_da3_split(
- struct xfs_da_state *state)
- {
- struct xfs_da_state_blk *oldblk;
- struct xfs_da_state_blk *newblk;
- struct xfs_da_state_blk *addblk;
- struct xfs_da_intnode *node;
- int max;
- int action = 0;
- int error;
- int i;
- trace_xfs_da_split(state->args);
- if (XFS_TEST_ERROR(false, state->mp, XFS_ERRTAG_DA_LEAF_SPLIT))
- return -EIO;
- /*
- * Walk back up the tree splitting/inserting/adjusting as necessary.
- * If we need to insert and there isn't room, split the node, then
- * decide which fragment to insert the new block from below into.
- * Note that we may split the root this way, but we need more fixup.
- */
- max = state->path.active - 1;
- ASSERT((max >= 0) && (max < XFS_DA_NODE_MAXDEPTH));
- ASSERT(state->path.blk[max].magic == XFS_ATTR_LEAF_MAGIC ||
- state->path.blk[max].magic == XFS_DIR2_LEAFN_MAGIC);
- addblk = &state->path.blk[max]; /* initial dummy value */
- for (i = max; (i >= 0) && addblk; state->path.active--, i--) {
- oldblk = &state->path.blk[i];
- newblk = &state->altpath.blk[i];
- /*
- * If a leaf node then
- * Allocate a new leaf node, then rebalance across them.
- * else if an intermediate node then
- * We split on the last layer, must we split the node?
- */
- switch (oldblk->magic) {
- case XFS_ATTR_LEAF_MAGIC:
- error = xfs_attr3_leaf_split(state, oldblk, newblk);
- if ((error != 0) && (error != -ENOSPC)) {
- return error; /* GROT: attr is inconsistent */
- }
- if (!error) {
- addblk = newblk;
- break;
- }
- /*
- * Entry wouldn't fit, split the leaf again. The new
- * extrablk will be consumed by xfs_da3_node_split if
- * the node is split.
- */
- state->extravalid = 1;
- if (state->inleaf) {
- state->extraafter = 0; /* before newblk */
- trace_xfs_attr_leaf_split_before(state->args);
- error = xfs_attr3_leaf_split(state, oldblk,
- &state->extrablk);
- } else {
- state->extraafter = 1; /* after newblk */
- trace_xfs_attr_leaf_split_after(state->args);
- error = xfs_attr3_leaf_split(state, newblk,
- &state->extrablk);
- }
- if (error)
- return error; /* GROT: attr inconsistent */
- addblk = newblk;
- break;
- case XFS_DIR2_LEAFN_MAGIC:
- error = xfs_dir2_leafn_split(state, oldblk, newblk);
- if (error)
- return error;
- addblk = newblk;
- break;
- case XFS_DA_NODE_MAGIC:
- error = xfs_da3_node_split(state, oldblk, newblk, addblk,
- max - i, &action);
- addblk->bp = NULL;
- if (error)
- return error; /* GROT: dir is inconsistent */
- /*
- * Record the newly split block for the next time thru?
- */
- if (action)
- addblk = newblk;
- else
- addblk = NULL;
- break;
- }
- /*
- * Update the btree to show the new hashval for this child.
- */
- xfs_da3_fixhashpath(state, &state->path);
- }
- if (!addblk)
- return 0;
- /*
- * xfs_da3_node_split() should have consumed any extra blocks we added
- * during a double leaf split in the attr fork. This is guaranteed as
- * we can't be here if the attr fork only has a single leaf block.
- */
- ASSERT(state->extravalid == 0 ||
- state->path.blk[max].magic == XFS_DIR2_LEAFN_MAGIC);
- /*
- * Split the root node.
- */
- ASSERT(state->path.active == 0);
- oldblk = &state->path.blk[0];
- error = xfs_da3_root_split(state, oldblk, addblk);
- if (error)
- goto out;
- /*
- * Update pointers to the node which used to be block 0 and just got
- * bumped because of the addition of a new root node. Note that the
- * original block 0 could be at any position in the list of blocks in
- * the tree.
- *
- * Note: the magic numbers and sibling pointers are in the same physical
- * place for both v2 and v3 headers (by design). Hence it doesn't matter
- * which version of the xfs_da_intnode structure we use here as the
- * result will be the same using either structure.
- */
- node = oldblk->bp->b_addr;
- if (node->hdr.info.forw) {
- if (be32_to_cpu(node->hdr.info.forw) != addblk->blkno) {
- xfs_buf_mark_corrupt(oldblk->bp);
- error = -EFSCORRUPTED;
- goto out;
- }
- node = addblk->bp->b_addr;
- node->hdr.info.back = cpu_to_be32(oldblk->blkno);
- xfs_trans_log_buf(state->args->trans, addblk->bp,
- XFS_DA_LOGRANGE(node, &node->hdr.info,
- sizeof(node->hdr.info)));
- }
- node = oldblk->bp->b_addr;
- if (node->hdr.info.back) {
- if (be32_to_cpu(node->hdr.info.back) != addblk->blkno) {
- xfs_buf_mark_corrupt(oldblk->bp);
- error = -EFSCORRUPTED;
- goto out;
- }
- node = addblk->bp->b_addr;
- node->hdr.info.forw = cpu_to_be32(oldblk->blkno);
- xfs_trans_log_buf(state->args->trans, addblk->bp,
- XFS_DA_LOGRANGE(node, &node->hdr.info,
- sizeof(node->hdr.info)));
- }
- out:
- addblk->bp = NULL;
- return error;
- }
- /*
- * Split the root. We have to create a new root and point to the two
- * parts (the split old root) that we just created. Copy block zero to
- * the EOF, extending the inode in process.
- */
- STATIC int /* error */
- xfs_da3_root_split(
- struct xfs_da_state *state,
- struct xfs_da_state_blk *blk1,
- struct xfs_da_state_blk *blk2)
- {
- struct xfs_da_intnode *node;
- struct xfs_da_intnode *oldroot;
- struct xfs_da_node_entry *btree;
- struct xfs_da3_icnode_hdr nodehdr;
- struct xfs_da_args *args;
- struct xfs_buf *bp;
- struct xfs_inode *dp;
- struct xfs_trans *tp;
- struct xfs_dir2_leaf *leaf;
- xfs_dablk_t blkno;
- int level;
- int error;
- int size;
- trace_xfs_da_root_split(state->args);
- /*
- * Copy the existing (incorrect) block from the root node position
- * to a free space somewhere.
- */
- args = state->args;
- error = xfs_da_grow_inode(args, &blkno);
- if (error)
- return error;
- dp = args->dp;
- tp = args->trans;
- error = xfs_da_get_buf(tp, dp, blkno, &bp, args->whichfork);
- if (error)
- return error;
- node = bp->b_addr;
- oldroot = blk1->bp->b_addr;
- if (oldroot->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC) ||
- oldroot->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC)) {
- struct xfs_da3_icnode_hdr icnodehdr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &icnodehdr, oldroot);
- btree = icnodehdr.btree;
- size = (int)((char *)&btree[icnodehdr.count] - (char *)oldroot);
- level = icnodehdr.level;
- /*
- * we are about to copy oldroot to bp, so set up the type
- * of bp while we know exactly what it will be.
- */
- xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DA_NODE_BUF);
- } else {
- struct xfs_dir3_icleaf_hdr leafhdr;
- leaf = (xfs_dir2_leaf_t *)oldroot;
- xfs_dir2_leaf_hdr_from_disk(dp->i_mount, &leafhdr, leaf);
- ASSERT(leafhdr.magic == XFS_DIR2_LEAFN_MAGIC ||
- leafhdr.magic == XFS_DIR3_LEAFN_MAGIC);
- size = (int)((char *)&leafhdr.ents[leafhdr.count] -
- (char *)leaf);
- level = 0;
- /*
- * we are about to copy oldroot to bp, so set up the type
- * of bp while we know exactly what it will be.
- */
- xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAFN_BUF);
- }
- /*
- * we can copy most of the information in the node from one block to
- * another, but for CRC enabled headers we have to make sure that the
- * block specific identifiers are kept intact. We update the buffer
- * directly for this.
- */
- memcpy(node, oldroot, size);
- if (oldroot->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC) ||
- oldroot->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)) {
- struct xfs_da3_intnode *node3 = (struct xfs_da3_intnode *)node;
- node3->hdr.info.blkno = cpu_to_be64(xfs_buf_daddr(bp));
- }
- xfs_trans_log_buf(tp, bp, 0, size - 1);
- bp->b_ops = blk1->bp->b_ops;
- xfs_trans_buf_copy_type(bp, blk1->bp);
- blk1->bp = bp;
- blk1->blkno = blkno;
- /*
- * Set up the new root node.
- */
- error = xfs_da3_node_create(args,
- (args->whichfork == XFS_DATA_FORK) ? args->geo->leafblk : 0,
- level + 1, &bp, args->whichfork);
- if (error)
- return error;
- node = bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr, node);
- btree = nodehdr.btree;
- btree[0].hashval = cpu_to_be32(blk1->hashval);
- btree[0].before = cpu_to_be32(blk1->blkno);
- btree[1].hashval = cpu_to_be32(blk2->hashval);
- btree[1].before = cpu_to_be32(blk2->blkno);
- nodehdr.count = 2;
- xfs_da3_node_hdr_to_disk(dp->i_mount, node, &nodehdr);
- #ifdef DEBUG
- if (oldroot->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
- oldroot->hdr.info.magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)) {
- ASSERT(blk1->blkno >= args->geo->leafblk &&
- blk1->blkno < args->geo->freeblk);
- ASSERT(blk2->blkno >= args->geo->leafblk &&
- blk2->blkno < args->geo->freeblk);
- }
- #endif
- /* Header is already logged by xfs_da_node_create */
- xfs_trans_log_buf(tp, bp,
- XFS_DA_LOGRANGE(node, btree, sizeof(xfs_da_node_entry_t) * 2));
- return 0;
- }
- /*
- * Split the node, rebalance, then add the new entry.
- */
- STATIC int /* error */
- xfs_da3_node_split(
- struct xfs_da_state *state,
- struct xfs_da_state_blk *oldblk,
- struct xfs_da_state_blk *newblk,
- struct xfs_da_state_blk *addblk,
- int treelevel,
- int *result)
- {
- struct xfs_da_intnode *node;
- struct xfs_da3_icnode_hdr nodehdr;
- xfs_dablk_t blkno;
- int newcount;
- int error;
- int useextra;
- struct xfs_inode *dp = state->args->dp;
- trace_xfs_da_node_split(state->args);
- node = oldblk->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr, node);
- /*
- * With V2 dirs the extra block is data or freespace.
- */
- useextra = state->extravalid && state->args->whichfork == XFS_ATTR_FORK;
- newcount = 1 + useextra;
- /*
- * Do we have to split the node?
- */
- if (nodehdr.count + newcount > state->args->geo->node_ents) {
- /*
- * Allocate a new node, add to the doubly linked chain of
- * nodes, then move some of our excess entries into it.
- */
- error = xfs_da_grow_inode(state->args, &blkno);
- if (error)
- return error; /* GROT: dir is inconsistent */
- error = xfs_da3_node_create(state->args, blkno, treelevel,
- &newblk->bp, state->args->whichfork);
- if (error)
- return error; /* GROT: dir is inconsistent */
- newblk->blkno = blkno;
- newblk->magic = XFS_DA_NODE_MAGIC;
- xfs_da3_node_rebalance(state, oldblk, newblk);
- error = xfs_da3_blk_link(state, oldblk, newblk);
- if (error)
- return error;
- *result = 1;
- } else {
- *result = 0;
- }
- /*
- * Insert the new entry(s) into the correct block
- * (updating last hashval in the process).
- *
- * xfs_da3_node_add() inserts BEFORE the given index,
- * and as a result of using node_lookup_int() we always
- * point to a valid entry (not after one), but a split
- * operation always results in a new block whose hashvals
- * FOLLOW the current block.
- *
- * If we had double-split op below us, then add the extra block too.
- */
- node = oldblk->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr, node);
- if (oldblk->index <= nodehdr.count) {
- oldblk->index++;
- xfs_da3_node_add(state, oldblk, addblk);
- if (useextra) {
- if (state->extraafter)
- oldblk->index++;
- xfs_da3_node_add(state, oldblk, &state->extrablk);
- state->extravalid = 0;
- }
- } else {
- newblk->index++;
- xfs_da3_node_add(state, newblk, addblk);
- if (useextra) {
- if (state->extraafter)
- newblk->index++;
- xfs_da3_node_add(state, newblk, &state->extrablk);
- state->extravalid = 0;
- }
- }
- return 0;
- }
- /*
- * Balance the btree elements between two intermediate nodes,
- * usually one full and one empty.
- *
- * NOTE: if blk2 is empty, then it will get the upper half of blk1.
- */
- STATIC void
- xfs_da3_node_rebalance(
- struct xfs_da_state *state,
- struct xfs_da_state_blk *blk1,
- struct xfs_da_state_blk *blk2)
- {
- struct xfs_da_intnode *node1;
- struct xfs_da_intnode *node2;
- struct xfs_da_node_entry *btree1;
- struct xfs_da_node_entry *btree2;
- struct xfs_da_node_entry *btree_s;
- struct xfs_da_node_entry *btree_d;
- struct xfs_da3_icnode_hdr nodehdr1;
- struct xfs_da3_icnode_hdr nodehdr2;
- struct xfs_trans *tp;
- int count;
- int tmp;
- int swap = 0;
- struct xfs_inode *dp = state->args->dp;
- trace_xfs_da_node_rebalance(state->args);
- node1 = blk1->bp->b_addr;
- node2 = blk2->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr1, node1);
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr2, node2);
- btree1 = nodehdr1.btree;
- btree2 = nodehdr2.btree;
- /*
- * Figure out how many entries need to move, and in which direction.
- * Swap the nodes around if that makes it simpler.
- */
- if (nodehdr1.count > 0 && nodehdr2.count > 0 &&
- ((be32_to_cpu(btree2[0].hashval) < be32_to_cpu(btree1[0].hashval)) ||
- (be32_to_cpu(btree2[nodehdr2.count - 1].hashval) <
- be32_to_cpu(btree1[nodehdr1.count - 1].hashval)))) {
- swap(node1, node2);
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr1, node1);
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr2, node2);
- btree1 = nodehdr1.btree;
- btree2 = nodehdr2.btree;
- swap = 1;
- }
- count = (nodehdr1.count - nodehdr2.count) / 2;
- if (count == 0)
- return;
- tp = state->args->trans;
- /*
- * Two cases: high-to-low and low-to-high.
- */
- if (count > 0) {
- /*
- * Move elements in node2 up to make a hole.
- */
- tmp = nodehdr2.count;
- if (tmp > 0) {
- tmp *= (uint)sizeof(xfs_da_node_entry_t);
- btree_s = &btree2[0];
- btree_d = &btree2[count];
- memmove(btree_d, btree_s, tmp);
- }
- /*
- * Move the req'd B-tree elements from high in node1 to
- * low in node2.
- */
- nodehdr2.count += count;
- tmp = count * (uint)sizeof(xfs_da_node_entry_t);
- btree_s = &btree1[nodehdr1.count - count];
- btree_d = &btree2[0];
- memcpy(btree_d, btree_s, tmp);
- nodehdr1.count -= count;
- } else {
- /*
- * Move the req'd B-tree elements from low in node2 to
- * high in node1.
- */
- count = -count;
- tmp = count * (uint)sizeof(xfs_da_node_entry_t);
- btree_s = &btree2[0];
- btree_d = &btree1[nodehdr1.count];
- memcpy(btree_d, btree_s, tmp);
- nodehdr1.count += count;
- xfs_trans_log_buf(tp, blk1->bp,
- XFS_DA_LOGRANGE(node1, btree_d, tmp));
- /*
- * Move elements in node2 down to fill the hole.
- */
- tmp = nodehdr2.count - count;
- tmp *= (uint)sizeof(xfs_da_node_entry_t);
- btree_s = &btree2[count];
- btree_d = &btree2[0];
- memmove(btree_d, btree_s, tmp);
- nodehdr2.count -= count;
- }
- /*
- * Log header of node 1 and all current bits of node 2.
- */
- xfs_da3_node_hdr_to_disk(dp->i_mount, node1, &nodehdr1);
- xfs_trans_log_buf(tp, blk1->bp,
- XFS_DA_LOGRANGE(node1, &node1->hdr,
- state->args->geo->node_hdr_size));
- xfs_da3_node_hdr_to_disk(dp->i_mount, node2, &nodehdr2);
- xfs_trans_log_buf(tp, blk2->bp,
- XFS_DA_LOGRANGE(node2, &node2->hdr,
- state->args->geo->node_hdr_size +
- (sizeof(btree2[0]) * nodehdr2.count)));
- /*
- * Record the last hashval from each block for upward propagation.
- * (note: don't use the swapped node pointers)
- */
- if (swap) {
- node1 = blk1->bp->b_addr;
- node2 = blk2->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr1, node1);
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr2, node2);
- btree1 = nodehdr1.btree;
- btree2 = nodehdr2.btree;
- }
- blk1->hashval = be32_to_cpu(btree1[nodehdr1.count - 1].hashval);
- blk2->hashval = be32_to_cpu(btree2[nodehdr2.count - 1].hashval);
- /*
- * Adjust the expected index for insertion.
- */
- if (blk1->index >= nodehdr1.count) {
- blk2->index = blk1->index - nodehdr1.count;
- blk1->index = nodehdr1.count + 1; /* make it invalid */
- }
- }
- /*
- * Add a new entry to an intermediate node.
- */
- STATIC void
- xfs_da3_node_add(
- struct xfs_da_state *state,
- struct xfs_da_state_blk *oldblk,
- struct xfs_da_state_blk *newblk)
- {
- struct xfs_da_intnode *node;
- struct xfs_da3_icnode_hdr nodehdr;
- struct xfs_da_node_entry *btree;
- int tmp;
- struct xfs_inode *dp = state->args->dp;
- trace_xfs_da_node_add(state->args);
- node = oldblk->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr, node);
- btree = nodehdr.btree;
- ASSERT(oldblk->index >= 0 && oldblk->index <= nodehdr.count);
- ASSERT(newblk->blkno != 0);
- if (state->args->whichfork == XFS_DATA_FORK)
- ASSERT(newblk->blkno >= state->args->geo->leafblk &&
- newblk->blkno < state->args->geo->freeblk);
- /*
- * We may need to make some room before we insert the new node.
- */
- tmp = 0;
- if (oldblk->index < nodehdr.count) {
- tmp = (nodehdr.count - oldblk->index) * (uint)sizeof(*btree);
- memmove(&btree[oldblk->index + 1], &btree[oldblk->index], tmp);
- }
- btree[oldblk->index].hashval = cpu_to_be32(newblk->hashval);
- btree[oldblk->index].before = cpu_to_be32(newblk->blkno);
- xfs_trans_log_buf(state->args->trans, oldblk->bp,
- XFS_DA_LOGRANGE(node, &btree[oldblk->index],
- tmp + sizeof(*btree)));
- nodehdr.count += 1;
- xfs_da3_node_hdr_to_disk(dp->i_mount, node, &nodehdr);
- xfs_trans_log_buf(state->args->trans, oldblk->bp,
- XFS_DA_LOGRANGE(node, &node->hdr,
- state->args->geo->node_hdr_size));
- /*
- * Copy the last hash value from the oldblk to propagate upwards.
- */
- oldblk->hashval = be32_to_cpu(btree[nodehdr.count - 1].hashval);
- }
- /*========================================================================
- * Routines used for shrinking the Btree.
- *========================================================================*/
- /*
- * Deallocate an empty leaf node, remove it from its parent,
- * possibly deallocating that block, etc...
- */
- int
- xfs_da3_join(
- struct xfs_da_state *state)
- {
- struct xfs_da_state_blk *drop_blk;
- struct xfs_da_state_blk *save_blk;
- int action = 0;
- int error;
- trace_xfs_da_join(state->args);
- drop_blk = &state->path.blk[ state->path.active-1 ];
- save_blk = &state->altpath.blk[ state->path.active-1 ];
- ASSERT(state->path.blk[0].magic == XFS_DA_NODE_MAGIC);
- ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC ||
- drop_blk->magic == XFS_DIR2_LEAFN_MAGIC);
- /*
- * Walk back up the tree joining/deallocating as necessary.
- * When we stop dropping blocks, break out.
- */
- for ( ; state->path.active >= 2; drop_blk--, save_blk--,
- state->path.active--) {
- /*
- * See if we can combine the block with a neighbor.
- * (action == 0) => no options, just leave
- * (action == 1) => coalesce, then unlink
- * (action == 2) => block empty, unlink it
- */
- switch (drop_blk->magic) {
- case XFS_ATTR_LEAF_MAGIC:
- error = xfs_attr3_leaf_toosmall(state, &action);
- if (error)
- return error;
- if (action == 0)
- return 0;
- xfs_attr3_leaf_unbalance(state, drop_blk, save_blk);
- break;
- case XFS_DIR2_LEAFN_MAGIC:
- error = xfs_dir2_leafn_toosmall(state, &action);
- if (error)
- return error;
- if (action == 0)
- return 0;
- xfs_dir2_leafn_unbalance(state, drop_blk, save_blk);
- break;
- case XFS_DA_NODE_MAGIC:
- /*
- * Remove the offending node, fixup hashvals,
- * check for a toosmall neighbor.
- */
- xfs_da3_node_remove(state, drop_blk);
- xfs_da3_fixhashpath(state, &state->path);
- error = xfs_da3_node_toosmall(state, &action);
- if (error)
- return error;
- if (action == 0)
- return 0;
- xfs_da3_node_unbalance(state, drop_blk, save_blk);
- break;
- }
- xfs_da3_fixhashpath(state, &state->altpath);
- error = xfs_da3_blk_unlink(state, drop_blk, save_blk);
- xfs_da_state_kill_altpath(state);
- if (error)
- return error;
- error = xfs_da_shrink_inode(state->args, drop_blk->blkno,
- drop_blk->bp);
- drop_blk->bp = NULL;
- if (error)
- return error;
- }
- /*
- * We joined all the way to the top. If it turns out that
- * we only have one entry in the root, make the child block
- * the new root.
- */
- xfs_da3_node_remove(state, drop_blk);
- xfs_da3_fixhashpath(state, &state->path);
- error = xfs_da3_root_join(state, &state->path.blk[0]);
- return error;
- }
- #ifdef DEBUG
- static void
- xfs_da_blkinfo_onlychild_validate(struct xfs_da_blkinfo *blkinfo, __u16 level)
- {
- __be16 magic = blkinfo->magic;
- if (level == 1) {
- ASSERT(magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
- magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC) ||
- magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC) ||
- magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC));
- } else {
- ASSERT(magic == cpu_to_be16(XFS_DA_NODE_MAGIC) ||
- magic == cpu_to_be16(XFS_DA3_NODE_MAGIC));
- }
- ASSERT(!blkinfo->forw);
- ASSERT(!blkinfo->back);
- }
- #else /* !DEBUG */
- #define xfs_da_blkinfo_onlychild_validate(blkinfo, level)
- #endif /* !DEBUG */
- /*
- * We have only one entry in the root. Copy the only remaining child of
- * the old root to block 0 as the new root node.
- */
- STATIC int
- xfs_da3_root_join(
- struct xfs_da_state *state,
- struct xfs_da_state_blk *root_blk)
- {
- struct xfs_da_intnode *oldroot;
- struct xfs_da_args *args;
- xfs_dablk_t child;
- struct xfs_buf *bp;
- struct xfs_da3_icnode_hdr oldroothdr;
- int error;
- struct xfs_inode *dp = state->args->dp;
- trace_xfs_da_root_join(state->args);
- ASSERT(root_blk->magic == XFS_DA_NODE_MAGIC);
- args = state->args;
- oldroot = root_blk->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &oldroothdr, oldroot);
- ASSERT(oldroothdr.forw == 0);
- ASSERT(oldroothdr.back == 0);
- /*
- * If the root has more than one child, then don't do anything.
- */
- if (oldroothdr.count > 1)
- return 0;
- /*
- * Read in the (only) child block, then copy those bytes into
- * the root block's buffer and free the original child block.
- */
- child = be32_to_cpu(oldroothdr.btree[0].before);
- ASSERT(child != 0);
- error = xfs_da3_node_read(args->trans, dp, child, &bp, args->whichfork);
- if (error)
- return error;
- xfs_da_blkinfo_onlychild_validate(bp->b_addr, oldroothdr.level);
- /*
- * This could be copying a leaf back into the root block in the case of
- * there only being a single leaf block left in the tree. Hence we have
- * to update the b_ops pointer as well to match the buffer type change
- * that could occur. For dir3 blocks we also need to update the block
- * number in the buffer header.
- */
- memcpy(root_blk->bp->b_addr, bp->b_addr, args->geo->blksize);
- root_blk->bp->b_ops = bp->b_ops;
- xfs_trans_buf_copy_type(root_blk->bp, bp);
- if (oldroothdr.magic == XFS_DA3_NODE_MAGIC) {
- struct xfs_da3_blkinfo *da3 = root_blk->bp->b_addr;
- da3->blkno = cpu_to_be64(xfs_buf_daddr(root_blk->bp));
- }
- xfs_trans_log_buf(args->trans, root_blk->bp, 0,
- args->geo->blksize - 1);
- error = xfs_da_shrink_inode(args, child, bp);
- return error;
- }
- /*
- * Check a node 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.
- */
- STATIC int
- xfs_da3_node_toosmall(
- struct xfs_da_state *state,
- int *action)
- {
- struct xfs_da_intnode *node;
- struct xfs_da_state_blk *blk;
- struct xfs_da_blkinfo *info;
- xfs_dablk_t blkno;
- struct xfs_buf *bp;
- struct xfs_da3_icnode_hdr nodehdr;
- int count;
- int forward;
- int error;
- int retval;
- int i;
- struct xfs_inode *dp = state->args->dp;
- trace_xfs_da_node_toosmall(state->args);
- /*
- * Check for the degenerate case of the block being over 50% full.
- * If so, it's not worth even looking to see if we might be able
- * to coalesce with a sibling.
- */
- blk = &state->path.blk[ state->path.active-1 ];
- info = blk->bp->b_addr;
- node = (xfs_da_intnode_t *)info;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr, node);
- if (nodehdr.count > (state->args->geo->node_ents >> 1)) {
- *action = 0; /* blk over 50%, don't try to join */
- return 0; /* blk over 50%, don't try to join */
- }
- /*
- * 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 (nodehdr.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_da3_path_shift(state, &state->altpath, forward,
- 0, &retval);
- if (error)
- return error;
- if (retval) {
- *action = 0;
- } else {
- *action = 2;
- }
- return 0;
- }
- /*
- * Examine each sibling block to see if we can coalesce with
- * at least 25% free space to spare. We need to figure out
- * whether to merge with the forward or the backward block.
- * We prefer coalescing with the lower numbered sibling so as
- * to shrink a directory over time.
- */
- count = state->args->geo->node_ents;
- count -= state->args->geo->node_ents >> 2;
- count -= nodehdr.count;
- /* start with smaller blk num */
- forward = nodehdr.forw < nodehdr.back;
- for (i = 0; i < 2; forward = !forward, i++) {
- struct xfs_da3_icnode_hdr thdr;
- if (forward)
- blkno = nodehdr.forw;
- else
- blkno = nodehdr.back;
- if (blkno == 0)
- continue;
- error = xfs_da3_node_read(state->args->trans, dp, blkno, &bp,
- state->args->whichfork);
- if (error)
- return error;
- node = bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &thdr, node);
- xfs_trans_brelse(state->args->trans, bp);
- if (count - thdr.count >= 0)
- break; /* fits with at least 25% to spare */
- }
- if (i >= 2) {
- *action = 0;
- return 0;
- }
- /*
- * Make altpath point to the block we want to keep (the lower
- * numbered block) and path point to the block we want to drop.
- */
- memcpy(&state->altpath, &state->path, sizeof(state->path));
- if (blkno < blk->blkno) {
- error = xfs_da3_path_shift(state, &state->altpath, forward,
- 0, &retval);
- } else {
- error = xfs_da3_path_shift(state, &state->path, forward,
- 0, &retval);
- }
- if (error)
- return error;
- if (retval) {
- *action = 0;
- return 0;
- }
- *action = 1;
- return 0;
- }
- /*
- * Pick up the last hashvalue from an intermediate node.
- */
- STATIC uint
- xfs_da3_node_lasthash(
- struct xfs_inode *dp,
- struct xfs_buf *bp,
- int *count)
- {
- struct xfs_da3_icnode_hdr nodehdr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr, bp->b_addr);
- if (count)
- *count = nodehdr.count;
- if (!nodehdr.count)
- return 0;
- return be32_to_cpu(nodehdr.btree[nodehdr.count - 1].hashval);
- }
- /*
- * Walk back up the tree adjusting hash values as necessary,
- * when we stop making changes, return.
- */
- void
- xfs_da3_fixhashpath(
- struct xfs_da_state *state,
- struct xfs_da_state_path *path)
- {
- struct xfs_da_state_blk *blk;
- struct xfs_da_intnode *node;
- struct xfs_da_node_entry *btree;
- xfs_dahash_t lasthash=0;
- int level;
- int count;
- struct xfs_inode *dp = state->args->dp;
- trace_xfs_da_fixhashpath(state->args);
- level = path->active-1;
- blk = &path->blk[ level ];
- switch (blk->magic) {
- case XFS_ATTR_LEAF_MAGIC:
- lasthash = xfs_attr_leaf_lasthash(blk->bp, &count);
- if (count == 0)
- return;
- break;
- case XFS_DIR2_LEAFN_MAGIC:
- lasthash = xfs_dir2_leaf_lasthash(dp, blk->bp, &count);
- if (count == 0)
- return;
- break;
- case XFS_DA_NODE_MAGIC:
- lasthash = xfs_da3_node_lasthash(dp, blk->bp, &count);
- if (count == 0)
- return;
- break;
- }
- for (blk--, level--; level >= 0; blk--, level--) {
- struct xfs_da3_icnode_hdr nodehdr;
- node = blk->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr, node);
- btree = nodehdr.btree;
- if (be32_to_cpu(btree[blk->index].hashval) == lasthash)
- break;
- blk->hashval = lasthash;
- btree[blk->index].hashval = cpu_to_be32(lasthash);
- xfs_trans_log_buf(state->args->trans, blk->bp,
- XFS_DA_LOGRANGE(node, &btree[blk->index],
- sizeof(*btree)));
- lasthash = be32_to_cpu(btree[nodehdr.count - 1].hashval);
- }
- }
- /*
- * Remove an entry from an intermediate node.
- */
- STATIC void
- xfs_da3_node_remove(
- struct xfs_da_state *state,
- struct xfs_da_state_blk *drop_blk)
- {
- struct xfs_da_intnode *node;
- struct xfs_da3_icnode_hdr nodehdr;
- struct xfs_da_node_entry *btree;
- int index;
- int tmp;
- struct xfs_inode *dp = state->args->dp;
- trace_xfs_da_node_remove(state->args);
- node = drop_blk->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr, node);
- ASSERT(drop_blk->index < nodehdr.count);
- ASSERT(drop_blk->index >= 0);
- /*
- * Copy over the offending entry, or just zero it out.
- */
- index = drop_blk->index;
- btree = nodehdr.btree;
- if (index < nodehdr.count - 1) {
- tmp = nodehdr.count - index - 1;
- tmp *= (uint)sizeof(xfs_da_node_entry_t);
- memmove(&btree[index], &btree[index + 1], tmp);
- xfs_trans_log_buf(state->args->trans, drop_blk->bp,
- XFS_DA_LOGRANGE(node, &btree[index], tmp));
- index = nodehdr.count - 1;
- }
- memset(&btree[index], 0, sizeof(xfs_da_node_entry_t));
- xfs_trans_log_buf(state->args->trans, drop_blk->bp,
- XFS_DA_LOGRANGE(node, &btree[index], sizeof(btree[index])));
- nodehdr.count -= 1;
- xfs_da3_node_hdr_to_disk(dp->i_mount, node, &nodehdr);
- xfs_trans_log_buf(state->args->trans, drop_blk->bp,
- XFS_DA_LOGRANGE(node, &node->hdr, state->args->geo->node_hdr_size));
- /*
- * Copy the last hash value from the block to propagate upwards.
- */
- drop_blk->hashval = be32_to_cpu(btree[index - 1].hashval);
- }
- /*
- * Unbalance the elements between two intermediate nodes,
- * move all Btree elements from one node into another.
- */
- STATIC void
- xfs_da3_node_unbalance(
- struct xfs_da_state *state,
- struct xfs_da_state_blk *drop_blk,
- struct xfs_da_state_blk *save_blk)
- {
- struct xfs_da_intnode *drop_node;
- struct xfs_da_intnode *save_node;
- struct xfs_da_node_entry *drop_btree;
- struct xfs_da_node_entry *save_btree;
- struct xfs_da3_icnode_hdr drop_hdr;
- struct xfs_da3_icnode_hdr save_hdr;
- struct xfs_trans *tp;
- int sindex;
- int tmp;
- struct xfs_inode *dp = state->args->dp;
- trace_xfs_da_node_unbalance(state->args);
- drop_node = drop_blk->bp->b_addr;
- save_node = save_blk->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &drop_hdr, drop_node);
- xfs_da3_node_hdr_from_disk(dp->i_mount, &save_hdr, save_node);
- drop_btree = drop_hdr.btree;
- save_btree = save_hdr.btree;
- tp = state->args->trans;
- /*
- * If the dying block has lower hashvals, then move all the
- * elements in the remaining block up to make a hole.
- */
- if ((be32_to_cpu(drop_btree[0].hashval) <
- be32_to_cpu(save_btree[0].hashval)) ||
- (be32_to_cpu(drop_btree[drop_hdr.count - 1].hashval) <
- be32_to_cpu(save_btree[save_hdr.count - 1].hashval))) {
- /* XXX: check this - is memmove dst correct? */
- tmp = save_hdr.count * sizeof(xfs_da_node_entry_t);
- memmove(&save_btree[drop_hdr.count], &save_btree[0], tmp);
- sindex = 0;
- xfs_trans_log_buf(tp, save_blk->bp,
- XFS_DA_LOGRANGE(save_node, &save_btree[0],
- (save_hdr.count + drop_hdr.count) *
- sizeof(xfs_da_node_entry_t)));
- } else {
- sindex = save_hdr.count;
- xfs_trans_log_buf(tp, save_blk->bp,
- XFS_DA_LOGRANGE(save_node, &save_btree[sindex],
- drop_hdr.count * sizeof(xfs_da_node_entry_t)));
- }
- /*
- * Move all the B-tree elements from drop_blk to save_blk.
- */
- tmp = drop_hdr.count * (uint)sizeof(xfs_da_node_entry_t);
- memcpy(&save_btree[sindex], &drop_btree[0], tmp);
- save_hdr.count += drop_hdr.count;
- xfs_da3_node_hdr_to_disk(dp->i_mount, save_node, &save_hdr);
- xfs_trans_log_buf(tp, save_blk->bp,
- XFS_DA_LOGRANGE(save_node, &save_node->hdr,
- state->args->geo->node_hdr_size));
- /*
- * Save the last hashval in the remaining block for upward propagation.
- */
- save_blk->hashval = be32_to_cpu(save_btree[save_hdr.count - 1].hashval);
- }
- /*========================================================================
- * Routines used for finding things in the Btree.
- *========================================================================*/
- /*
- * Walk down the Btree looking for a particular filename, filling
- * in the state structure as we go.
- *
- * We will set the state structure to point to each of the elements
- * in each of the nodes where either the hashval is or should be.
- *
- * We support duplicate hashval's so for each entry in the current
- * node that could contain the desired hashval, descend. This is a
- * pruned depth-first tree search.
- */
- int /* error */
- xfs_da3_node_lookup_int(
- struct xfs_da_state *state,
- int *result)
- {
- struct xfs_da_state_blk *blk;
- struct xfs_da_blkinfo *curr;
- struct xfs_da_intnode *node;
- struct xfs_da_node_entry *btree;
- struct xfs_da3_icnode_hdr nodehdr;
- struct xfs_da_args *args;
- xfs_dablk_t blkno;
- xfs_dahash_t hashval;
- xfs_dahash_t btreehashval;
- int probe;
- int span;
- int max;
- int error;
- int retval;
- unsigned int expected_level = 0;
- uint16_t magic;
- struct xfs_inode *dp = state->args->dp;
- args = state->args;
- /*
- * Descend thru the B-tree searching each level for the right
- * node to use, until the right hashval is found.
- */
- blkno = args->geo->leafblk;
- for (blk = &state->path.blk[0], state->path.active = 1;
- state->path.active <= XFS_DA_NODE_MAXDEPTH;
- blk++, state->path.active++) {
- /*
- * Read the next node down in the tree.
- */
- blk->blkno = blkno;
- error = xfs_da3_node_read(args->trans, args->dp, blkno,
- &blk->bp, args->whichfork);
- if (error) {
- blk->blkno = 0;
- state->path.active--;
- return error;
- }
- curr = blk->bp->b_addr;
- magic = be16_to_cpu(curr->magic);
- if (magic == XFS_ATTR_LEAF_MAGIC ||
- magic == XFS_ATTR3_LEAF_MAGIC) {
- blk->magic = XFS_ATTR_LEAF_MAGIC;
- blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL);
- break;
- }
- if (magic == XFS_DIR2_LEAFN_MAGIC ||
- magic == XFS_DIR3_LEAFN_MAGIC) {
- blk->magic = XFS_DIR2_LEAFN_MAGIC;
- blk->hashval = xfs_dir2_leaf_lasthash(args->dp,
- blk->bp, NULL);
- break;
- }
- if (magic != XFS_DA_NODE_MAGIC && magic != XFS_DA3_NODE_MAGIC) {
- xfs_buf_mark_corrupt(blk->bp);
- return -EFSCORRUPTED;
- }
- blk->magic = XFS_DA_NODE_MAGIC;
- /*
- * Search an intermediate node for a match.
- */
- node = blk->bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr, node);
- btree = nodehdr.btree;
- /* Tree taller than we can handle; bail out! */
- if (nodehdr.level >= XFS_DA_NODE_MAXDEPTH) {
- xfs_buf_mark_corrupt(blk->bp);
- return -EFSCORRUPTED;
- }
- /* Check the level from the root. */
- if (blkno == args->geo->leafblk)
- expected_level = nodehdr.level - 1;
- else if (expected_level != nodehdr.level) {
- xfs_buf_mark_corrupt(blk->bp);
- return -EFSCORRUPTED;
- } else
- expected_level--;
- max = nodehdr.count;
- blk->hashval = be32_to_cpu(btree[max - 1].hashval);
- /*
- * Binary search. (note: small blocks will skip loop)
- */
- probe = span = max / 2;
- hashval = args->hashval;
- while (span > 4) {
- span /= 2;
- btreehashval = be32_to_cpu(btree[probe].hashval);
- if (btreehashval < hashval)
- probe += span;
- else if (btreehashval > hashval)
- probe -= span;
- else
- break;
- }
- ASSERT((probe >= 0) && (probe < max));
- ASSERT((span <= 4) ||
- (be32_to_cpu(btree[probe].hashval) == hashval));
- /*
- * Since we may have duplicate hashval's, find the first
- * matching hashval in the node.
- */
- while (probe > 0 &&
- be32_to_cpu(btree[probe].hashval) >= hashval) {
- probe--;
- }
- while (probe < max &&
- be32_to_cpu(btree[probe].hashval) < hashval) {
- probe++;
- }
- /*
- * Pick the right block to descend on.
- */
- if (probe == max) {
- blk->index = max - 1;
- blkno = be32_to_cpu(btree[max - 1].before);
- } else {
- blk->index = probe;
- blkno = be32_to_cpu(btree[probe].before);
- }
- /* We can't point back to the root. */
- if (XFS_IS_CORRUPT(dp->i_mount, blkno == args->geo->leafblk))
- return -EFSCORRUPTED;
- }
- if (XFS_IS_CORRUPT(dp->i_mount, expected_level != 0))
- return -EFSCORRUPTED;
- /*
- * A leaf block that ends in the hashval that we are interested in
- * (final hashval == search hashval) means that the next block may
- * contain more entries with the same hashval, shift upward to the
- * next leaf and keep searching.
- */
- for (;;) {
- if (blk->magic == XFS_DIR2_LEAFN_MAGIC) {
- retval = xfs_dir2_leafn_lookup_int(blk->bp, args,
- &blk->index, state);
- } else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
- retval = xfs_attr3_leaf_lookup_int(blk->bp, args);
- blk->index = args->index;
- args->blkno = blk->blkno;
- } else {
- ASSERT(0);
- return -EFSCORRUPTED;
- }
- if (((retval == -ENOENT) || (retval == -ENOATTR)) &&
- (blk->hashval == args->hashval)) {
- error = xfs_da3_path_shift(state, &state->path, 1, 1,
- &retval);
- if (error)
- return error;
- if (retval == 0) {
- continue;
- } else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
- /* path_shift() gives ENOENT */
- retval = -ENOATTR;
- }
- }
- break;
- }
- *result = retval;
- return 0;
- }
- /*========================================================================
- * Utility routines.
- *========================================================================*/
- /*
- * Compare two intermediate nodes for "order".
- */
- STATIC int
- xfs_da3_node_order(
- struct xfs_inode *dp,
- struct xfs_buf *node1_bp,
- struct xfs_buf *node2_bp)
- {
- struct xfs_da_intnode *node1;
- struct xfs_da_intnode *node2;
- struct xfs_da_node_entry *btree1;
- struct xfs_da_node_entry *btree2;
- struct xfs_da3_icnode_hdr node1hdr;
- struct xfs_da3_icnode_hdr node2hdr;
- node1 = node1_bp->b_addr;
- node2 = node2_bp->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &node1hdr, node1);
- xfs_da3_node_hdr_from_disk(dp->i_mount, &node2hdr, node2);
- btree1 = node1hdr.btree;
- btree2 = node2hdr.btree;
- if (node1hdr.count > 0 && node2hdr.count > 0 &&
- ((be32_to_cpu(btree2[0].hashval) < be32_to_cpu(btree1[0].hashval)) ||
- (be32_to_cpu(btree2[node2hdr.count - 1].hashval) <
- be32_to_cpu(btree1[node1hdr.count - 1].hashval)))) {
- return 1;
- }
- return 0;
- }
- /*
- * Link a new block into a doubly linked list of blocks (of whatever type).
- */
- int /* error */
- xfs_da3_blk_link(
- struct xfs_da_state *state,
- struct xfs_da_state_blk *old_blk,
- struct xfs_da_state_blk *new_blk)
- {
- struct xfs_da_blkinfo *old_info;
- struct xfs_da_blkinfo *new_info;
- struct xfs_da_blkinfo *tmp_info;
- struct xfs_da_args *args;
- struct xfs_buf *bp;
- int before = 0;
- int error;
- struct xfs_inode *dp = state->args->dp;
- /*
- * Set up environment.
- */
- args = state->args;
- ASSERT(args != NULL);
- old_info = old_blk->bp->b_addr;
- new_info = new_blk->bp->b_addr;
- ASSERT(old_blk->magic == XFS_DA_NODE_MAGIC ||
- old_blk->magic == XFS_DIR2_LEAFN_MAGIC ||
- old_blk->magic == XFS_ATTR_LEAF_MAGIC);
- switch (old_blk->magic) {
- case XFS_ATTR_LEAF_MAGIC:
- before = xfs_attr_leaf_order(old_blk->bp, new_blk->bp);
- break;
- case XFS_DIR2_LEAFN_MAGIC:
- before = xfs_dir2_leafn_order(dp, old_blk->bp, new_blk->bp);
- break;
- case XFS_DA_NODE_MAGIC:
- before = xfs_da3_node_order(dp, old_blk->bp, new_blk->bp);
- break;
- }
- /*
- * Link blocks in appropriate order.
- */
- if (before) {
- /*
- * Link new block in before existing block.
- */
- trace_xfs_da_link_before(args);
- new_info->forw = cpu_to_be32(old_blk->blkno);
- new_info->back = old_info->back;
- if (old_info->back) {
- error = xfs_da3_node_read(args->trans, dp,
- be32_to_cpu(old_info->back),
- &bp, args->whichfork);
- if (error)
- return error;
- ASSERT(bp != NULL);
- tmp_info = bp->b_addr;
- ASSERT(tmp_info->magic == old_info->magic);
- ASSERT(be32_to_cpu(tmp_info->forw) == old_blk->blkno);
- tmp_info->forw = cpu_to_be32(new_blk->blkno);
- xfs_trans_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1);
- }
- old_info->back = cpu_to_be32(new_blk->blkno);
- } else {
- /*
- * Link new block in after existing block.
- */
- trace_xfs_da_link_after(args);
- new_info->forw = old_info->forw;
- new_info->back = cpu_to_be32(old_blk->blkno);
- if (old_info->forw) {
- error = xfs_da3_node_read(args->trans, dp,
- be32_to_cpu(old_info->forw),
- &bp, args->whichfork);
- if (error)
- return error;
- ASSERT(bp != NULL);
- tmp_info = bp->b_addr;
- ASSERT(tmp_info->magic == old_info->magic);
- ASSERT(be32_to_cpu(tmp_info->back) == old_blk->blkno);
- tmp_info->back = cpu_to_be32(new_blk->blkno);
- xfs_trans_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1);
- }
- old_info->forw = cpu_to_be32(new_blk->blkno);
- }
- xfs_trans_log_buf(args->trans, old_blk->bp, 0, sizeof(*tmp_info) - 1);
- xfs_trans_log_buf(args->trans, new_blk->bp, 0, sizeof(*tmp_info) - 1);
- return 0;
- }
- /*
- * Unlink a block from a doubly linked list of blocks.
- */
- STATIC int /* error */
- xfs_da3_blk_unlink(
- struct xfs_da_state *state,
- struct xfs_da_state_blk *drop_blk,
- struct xfs_da_state_blk *save_blk)
- {
- struct xfs_da_blkinfo *drop_info;
- struct xfs_da_blkinfo *save_info;
- struct xfs_da_blkinfo *tmp_info;
- struct xfs_da_args *args;
- struct xfs_buf *bp;
- int error;
- /*
- * Set up environment.
- */
- args = state->args;
- ASSERT(args != NULL);
- save_info = save_blk->bp->b_addr;
- drop_info = drop_blk->bp->b_addr;
- ASSERT(save_blk->magic == XFS_DA_NODE_MAGIC ||
- save_blk->magic == XFS_DIR2_LEAFN_MAGIC ||
- save_blk->magic == XFS_ATTR_LEAF_MAGIC);
- ASSERT(save_blk->magic == drop_blk->magic);
- ASSERT((be32_to_cpu(save_info->forw) == drop_blk->blkno) ||
- (be32_to_cpu(save_info->back) == drop_blk->blkno));
- ASSERT((be32_to_cpu(drop_info->forw) == save_blk->blkno) ||
- (be32_to_cpu(drop_info->back) == save_blk->blkno));
- /*
- * Unlink the leaf block from the doubly linked chain of leaves.
- */
- if (be32_to_cpu(save_info->back) == drop_blk->blkno) {
- trace_xfs_da_unlink_back(args);
- save_info->back = drop_info->back;
- if (drop_info->back) {
- error = xfs_da3_node_read(args->trans, args->dp,
- be32_to_cpu(drop_info->back),
- &bp, args->whichfork);
- if (error)
- return error;
- ASSERT(bp != NULL);
- tmp_info = bp->b_addr;
- ASSERT(tmp_info->magic == save_info->magic);
- ASSERT(be32_to_cpu(tmp_info->forw) == drop_blk->blkno);
- tmp_info->forw = cpu_to_be32(save_blk->blkno);
- xfs_trans_log_buf(args->trans, bp, 0,
- sizeof(*tmp_info) - 1);
- }
- } else {
- trace_xfs_da_unlink_forward(args);
- save_info->forw = drop_info->forw;
- if (drop_info->forw) {
- error = xfs_da3_node_read(args->trans, args->dp,
- be32_to_cpu(drop_info->forw),
- &bp, args->whichfork);
- if (error)
- return error;
- ASSERT(bp != NULL);
- tmp_info = bp->b_addr;
- ASSERT(tmp_info->magic == save_info->magic);
- ASSERT(be32_to_cpu(tmp_info->back) == drop_blk->blkno);
- tmp_info->back = cpu_to_be32(save_blk->blkno);
- xfs_trans_log_buf(args->trans, bp, 0,
- sizeof(*tmp_info) - 1);
- }
- }
- xfs_trans_log_buf(args->trans, save_blk->bp, 0, sizeof(*save_info) - 1);
- return 0;
- }
- /*
- * Move a path "forward" or "!forward" one block at the current level.
- *
- * This routine will adjust a "path" to point to the next block
- * "forward" (higher hashvalues) or "!forward" (lower hashvals) in the
- * Btree, including updating pointers to the intermediate nodes between
- * the new bottom and the root.
- */
- int /* error */
- xfs_da3_path_shift(
- struct xfs_da_state *state,
- struct xfs_da_state_path *path,
- int forward,
- int release,
- int *result)
- {
- struct xfs_da_state_blk *blk;
- struct xfs_da_blkinfo *info;
- struct xfs_da_args *args;
- struct xfs_da_node_entry *btree;
- struct xfs_da3_icnode_hdr nodehdr;
- struct xfs_buf *bp;
- xfs_dablk_t blkno = 0;
- int level;
- int error;
- struct xfs_inode *dp = state->args->dp;
- trace_xfs_da_path_shift(state->args);
- /*
- * Roll up the Btree looking for the first block where our
- * current index is not at the edge of the block. Note that
- * we skip the bottom layer because we want the sibling block.
- */
- args = state->args;
- ASSERT(args != NULL);
- ASSERT(path != NULL);
- ASSERT((path->active > 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
- level = (path->active-1) - 1; /* skip bottom layer in path */
- for (; level >= 0; level--) {
- blk = &path->blk[level];
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr,
- blk->bp->b_addr);
- if (forward && (blk->index < nodehdr.count - 1)) {
- blk->index++;
- blkno = be32_to_cpu(nodehdr.btree[blk->index].before);
- break;
- } else if (!forward && (blk->index > 0)) {
- blk->index--;
- blkno = be32_to_cpu(nodehdr.btree[blk->index].before);
- break;
- }
- }
- if (level < 0) {
- *result = -ENOENT; /* we're out of our tree */
- ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
- return 0;
- }
- /*
- * Roll down the edge of the subtree until we reach the
- * same depth we were at originally.
- */
- for (blk++, level++; level < path->active; blk++, level++) {
- /*
- * Read the next child block into a local buffer.
- */
- error = xfs_da3_node_read(args->trans, dp, blkno, &bp,
- args->whichfork);
- if (error)
- return error;
- /*
- * Release the old block (if it's dirty, the trans doesn't
- * actually let go) and swap the local buffer into the path
- * structure. This ensures failure of the above read doesn't set
- * a NULL buffer in an active slot in the path.
- */
- if (release)
- xfs_trans_brelse(args->trans, blk->bp);
- blk->blkno = blkno;
- blk->bp = bp;
- info = blk->bp->b_addr;
- ASSERT(info->magic == cpu_to_be16(XFS_DA_NODE_MAGIC) ||
- info->magic == cpu_to_be16(XFS_DA3_NODE_MAGIC) ||
- info->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
- info->magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC) ||
- info->magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC) ||
- info->magic == cpu_to_be16(XFS_ATTR3_LEAF_MAGIC));
- /*
- * Note: we flatten the magic number to a single type so we
- * don't have to compare against crc/non-crc types elsewhere.
- */
- switch (be16_to_cpu(info->magic)) {
- case XFS_DA_NODE_MAGIC:
- case XFS_DA3_NODE_MAGIC:
- blk->magic = XFS_DA_NODE_MAGIC;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &nodehdr,
- bp->b_addr);
- btree = nodehdr.btree;
- blk->hashval = be32_to_cpu(btree[nodehdr.count - 1].hashval);
- if (forward)
- blk->index = 0;
- else
- blk->index = nodehdr.count - 1;
- blkno = be32_to_cpu(btree[blk->index].before);
- break;
- case XFS_ATTR_LEAF_MAGIC:
- case XFS_ATTR3_LEAF_MAGIC:
- blk->magic = XFS_ATTR_LEAF_MAGIC;
- ASSERT(level == path->active-1);
- blk->index = 0;
- blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL);
- break;
- case XFS_DIR2_LEAFN_MAGIC:
- case XFS_DIR3_LEAFN_MAGIC:
- blk->magic = XFS_DIR2_LEAFN_MAGIC;
- ASSERT(level == path->active-1);
- blk->index = 0;
- blk->hashval = xfs_dir2_leaf_lasthash(args->dp,
- blk->bp, NULL);
- break;
- default:
- ASSERT(0);
- break;
- }
- }
- *result = 0;
- return 0;
- }
- /*========================================================================
- * Utility routines.
- *========================================================================*/
- /*
- * Implement a simple hash on a character string.
- * Rotate the hash value by 7 bits, then XOR each character in.
- * This is implemented with some source-level loop unrolling.
- */
- xfs_dahash_t
- xfs_da_hashname(const uint8_t *name, int namelen)
- {
- xfs_dahash_t hash;
- /*
- * Do four characters at a time as long as we can.
- */
- for (hash = 0; namelen >= 4; namelen -= 4, name += 4)
- hash = (name[0] << 21) ^ (name[1] << 14) ^ (name[2] << 7) ^
- (name[3] << 0) ^ rol32(hash, 7 * 4);
- /*
- * Now do the rest of the characters.
- */
- switch (namelen) {
- case 3:
- return (name[0] << 14) ^ (name[1] << 7) ^ (name[2] << 0) ^
- rol32(hash, 7 * 3);
- case 2:
- return (name[0] << 7) ^ (name[1] << 0) ^ rol32(hash, 7 * 2);
- case 1:
- return (name[0] << 0) ^ rol32(hash, 7 * 1);
- default: /* case 0: */
- return hash;
- }
- }
- enum xfs_dacmp
- xfs_da_compname(
- struct xfs_da_args *args,
- const unsigned char *name,
- int len)
- {
- return (args->namelen == len && memcmp(args->name, name, len) == 0) ?
- XFS_CMP_EXACT : XFS_CMP_DIFFERENT;
- }
- int
- xfs_da_grow_inode_int(
- struct xfs_da_args *args,
- xfs_fileoff_t *bno,
- int count)
- {
- struct xfs_trans *tp = args->trans;
- struct xfs_inode *dp = args->dp;
- int w = args->whichfork;
- xfs_rfsblock_t nblks = dp->i_nblocks;
- struct xfs_bmbt_irec map, *mapp;
- int nmap, error, got, i, mapi;
- /*
- * Find a spot in the file space to put the new block.
- */
- error = xfs_bmap_first_unused(tp, dp, count, bno, w);
- if (error)
- return error;
- /*
- * Try mapping it in one filesystem block.
- */
- nmap = 1;
- error = xfs_bmapi_write(tp, dp, *bno, count,
- xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
- args->total, &map, &nmap);
- if (error)
- return error;
- ASSERT(nmap <= 1);
- if (nmap == 1) {
- mapp = ↦
- mapi = 1;
- } else if (nmap == 0 && count > 1) {
- xfs_fileoff_t b;
- int c;
- /*
- * If we didn't get it and the block might work if fragmented,
- * try without the CONTIG flag. Loop until we get it all.
- */
- mapp = kmem_alloc(sizeof(*mapp) * count, 0);
- for (b = *bno, mapi = 0; b < *bno + count; ) {
- c = (int)(*bno + count - b);
- nmap = min(XFS_BMAP_MAX_NMAP, c);
- error = xfs_bmapi_write(tp, dp, b, c,
- xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA,
- args->total, &mapp[mapi], &nmap);
- if (error)
- goto out_free_map;
- if (nmap < 1)
- break;
- mapi += nmap;
- b = mapp[mapi - 1].br_startoff +
- mapp[mapi - 1].br_blockcount;
- }
- } else {
- mapi = 0;
- mapp = NULL;
- }
- /*
- * Count the blocks we got, make sure it matches the total.
- */
- for (i = 0, got = 0; i < mapi; i++)
- got += mapp[i].br_blockcount;
- if (got != count || mapp[0].br_startoff != *bno ||
- mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
- *bno + count) {
- error = -ENOSPC;
- goto out_free_map;
- }
- /* account for newly allocated blocks in reserved blocks total */
- args->total -= dp->i_nblocks - nblks;
- out_free_map:
- if (mapp != &map)
- kmem_free(mapp);
- return error;
- }
- /*
- * Add a block to the btree ahead of the file.
- * Return the new block number to the caller.
- */
- int
- xfs_da_grow_inode(
- struct xfs_da_args *args,
- xfs_dablk_t *new_blkno)
- {
- xfs_fileoff_t bno;
- int error;
- trace_xfs_da_grow_inode(args);
- bno = args->geo->leafblk;
- error = xfs_da_grow_inode_int(args, &bno, args->geo->fsbcount);
- if (!error)
- *new_blkno = (xfs_dablk_t)bno;
- return error;
- }
- /*
- * Ick. We need to always be able to remove a btree block, even
- * if there's no space reservation because the filesystem is full.
- * This is called if xfs_bunmapi on a btree block fails due to ENOSPC.
- * It swaps the target block with the last block in the file. The
- * last block in the file can always be removed since it can't cause
- * a bmap btree split to do that.
- */
- STATIC int
- xfs_da3_swap_lastblock(
- struct xfs_da_args *args,
- xfs_dablk_t *dead_blknop,
- struct xfs_buf **dead_bufp)
- {
- struct xfs_da_blkinfo *dead_info;
- struct xfs_da_blkinfo *sib_info;
- struct xfs_da_intnode *par_node;
- struct xfs_da_intnode *dead_node;
- struct xfs_dir2_leaf *dead_leaf2;
- struct xfs_da_node_entry *btree;
- struct xfs_da3_icnode_hdr par_hdr;
- struct xfs_inode *dp;
- struct xfs_trans *tp;
- struct xfs_mount *mp;
- struct xfs_buf *dead_buf;
- struct xfs_buf *last_buf;
- struct xfs_buf *sib_buf;
- struct xfs_buf *par_buf;
- xfs_dahash_t dead_hash;
- xfs_fileoff_t lastoff;
- xfs_dablk_t dead_blkno;
- xfs_dablk_t last_blkno;
- xfs_dablk_t sib_blkno;
- xfs_dablk_t par_blkno;
- int error;
- int w;
- int entno;
- int level;
- int dead_level;
- trace_xfs_da_swap_lastblock(args);
- dead_buf = *dead_bufp;
- dead_blkno = *dead_blknop;
- tp = args->trans;
- dp = args->dp;
- w = args->whichfork;
- ASSERT(w == XFS_DATA_FORK);
- mp = dp->i_mount;
- lastoff = args->geo->freeblk;
- error = xfs_bmap_last_before(tp, dp, &lastoff, w);
- if (error)
- return error;
- if (XFS_IS_CORRUPT(mp, lastoff == 0))
- return -EFSCORRUPTED;
- /*
- * Read the last block in the btree space.
- */
- last_blkno = (xfs_dablk_t)lastoff - args->geo->fsbcount;
- error = xfs_da3_node_read(tp, dp, last_blkno, &last_buf, w);
- if (error)
- return error;
- /*
- * Copy the last block into the dead buffer and log it.
- */
- memcpy(dead_buf->b_addr, last_buf->b_addr, args->geo->blksize);
- xfs_trans_log_buf(tp, dead_buf, 0, args->geo->blksize - 1);
- dead_info = dead_buf->b_addr;
- /*
- * Get values from the moved block.
- */
- if (dead_info->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) ||
- dead_info->magic == cpu_to_be16(XFS_DIR3_LEAFN_MAGIC)) {
- struct xfs_dir3_icleaf_hdr leafhdr;
- struct xfs_dir2_leaf_entry *ents;
- dead_leaf2 = (xfs_dir2_leaf_t *)dead_info;
- xfs_dir2_leaf_hdr_from_disk(dp->i_mount, &leafhdr,
- dead_leaf2);
- ents = leafhdr.ents;
- dead_level = 0;
- dead_hash = be32_to_cpu(ents[leafhdr.count - 1].hashval);
- } else {
- struct xfs_da3_icnode_hdr deadhdr;
- dead_node = (xfs_da_intnode_t *)dead_info;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &deadhdr, dead_node);
- btree = deadhdr.btree;
- dead_level = deadhdr.level;
- dead_hash = be32_to_cpu(btree[deadhdr.count - 1].hashval);
- }
- sib_buf = par_buf = NULL;
- /*
- * If the moved block has a left sibling, fix up the pointers.
- */
- if ((sib_blkno = be32_to_cpu(dead_info->back))) {
- error = xfs_da3_node_read(tp, dp, sib_blkno, &sib_buf, w);
- if (error)
- goto done;
- sib_info = sib_buf->b_addr;
- if (XFS_IS_CORRUPT(mp,
- be32_to_cpu(sib_info->forw) != last_blkno ||
- sib_info->magic != dead_info->magic)) {
- error = -EFSCORRUPTED;
- goto done;
- }
- sib_info->forw = cpu_to_be32(dead_blkno);
- xfs_trans_log_buf(tp, sib_buf,
- XFS_DA_LOGRANGE(sib_info, &sib_info->forw,
- sizeof(sib_info->forw)));
- sib_buf = NULL;
- }
- /*
- * If the moved block has a right sibling, fix up the pointers.
- */
- if ((sib_blkno = be32_to_cpu(dead_info->forw))) {
- error = xfs_da3_node_read(tp, dp, sib_blkno, &sib_buf, w);
- if (error)
- goto done;
- sib_info = sib_buf->b_addr;
- if (XFS_IS_CORRUPT(mp,
- be32_to_cpu(sib_info->back) != last_blkno ||
- sib_info->magic != dead_info->magic)) {
- error = -EFSCORRUPTED;
- goto done;
- }
- sib_info->back = cpu_to_be32(dead_blkno);
- xfs_trans_log_buf(tp, sib_buf,
- XFS_DA_LOGRANGE(sib_info, &sib_info->back,
- sizeof(sib_info->back)));
- sib_buf = NULL;
- }
- par_blkno = args->geo->leafblk;
- level = -1;
- /*
- * Walk down the tree looking for the parent of the moved block.
- */
- for (;;) {
- error = xfs_da3_node_read(tp, dp, par_blkno, &par_buf, w);
- if (error)
- goto done;
- par_node = par_buf->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &par_hdr, par_node);
- if (XFS_IS_CORRUPT(mp,
- level >= 0 && level != par_hdr.level + 1)) {
- error = -EFSCORRUPTED;
- goto done;
- }
- level = par_hdr.level;
- btree = par_hdr.btree;
- for (entno = 0;
- entno < par_hdr.count &&
- be32_to_cpu(btree[entno].hashval) < dead_hash;
- entno++)
- continue;
- if (XFS_IS_CORRUPT(mp, entno == par_hdr.count)) {
- error = -EFSCORRUPTED;
- goto done;
- }
- par_blkno = be32_to_cpu(btree[entno].before);
- if (level == dead_level + 1)
- break;
- xfs_trans_brelse(tp, par_buf);
- par_buf = NULL;
- }
- /*
- * We're in the right parent block.
- * Look for the right entry.
- */
- for (;;) {
- for (;
- entno < par_hdr.count &&
- be32_to_cpu(btree[entno].before) != last_blkno;
- entno++)
- continue;
- if (entno < par_hdr.count)
- break;
- par_blkno = par_hdr.forw;
- xfs_trans_brelse(tp, par_buf);
- par_buf = NULL;
- if (XFS_IS_CORRUPT(mp, par_blkno == 0)) {
- error = -EFSCORRUPTED;
- goto done;
- }
- error = xfs_da3_node_read(tp, dp, par_blkno, &par_buf, w);
- if (error)
- goto done;
- par_node = par_buf->b_addr;
- xfs_da3_node_hdr_from_disk(dp->i_mount, &par_hdr, par_node);
- if (XFS_IS_CORRUPT(mp, par_hdr.level != level)) {
- error = -EFSCORRUPTED;
- goto done;
- }
- btree = par_hdr.btree;
- entno = 0;
- }
- /*
- * Update the parent entry pointing to the moved block.
- */
- btree[entno].before = cpu_to_be32(dead_blkno);
- xfs_trans_log_buf(tp, par_buf,
- XFS_DA_LOGRANGE(par_node, &btree[entno].before,
- sizeof(btree[entno].before)));
- *dead_blknop = last_blkno;
- *dead_bufp = last_buf;
- return 0;
- done:
- if (par_buf)
- xfs_trans_brelse(tp, par_buf);
- if (sib_buf)
- xfs_trans_brelse(tp, sib_buf);
- xfs_trans_brelse(tp, last_buf);
- return error;
- }
- /*
- * Remove a btree block from a directory or attribute.
- */
- int
- xfs_da_shrink_inode(
- struct xfs_da_args *args,
- xfs_dablk_t dead_blkno,
- struct xfs_buf *dead_buf)
- {
- struct xfs_inode *dp;
- int done, error, w, count;
- struct xfs_trans *tp;
- trace_xfs_da_shrink_inode(args);
- dp = args->dp;
- w = args->whichfork;
- tp = args->trans;
- count = args->geo->fsbcount;
- for (;;) {
- /*
- * Remove extents. If we get ENOSPC for a dir we have to move
- * the last block to the place we want to kill.
- */
- error = xfs_bunmapi(tp, dp, dead_blkno, count,
- xfs_bmapi_aflag(w), 0, &done);
- if (error == -ENOSPC) {
- if (w != XFS_DATA_FORK)
- break;
- error = xfs_da3_swap_lastblock(args, &dead_blkno,
- &dead_buf);
- if (error)
- break;
- } else {
- break;
- }
- }
- xfs_trans_binval(tp, dead_buf);
- return error;
- }
- static int
- xfs_dabuf_map(
- struct xfs_inode *dp,
- xfs_dablk_t bno,
- unsigned int flags,
- int whichfork,
- struct xfs_buf_map **mapp,
- int *nmaps)
- {
- struct xfs_mount *mp = dp->i_mount;
- int nfsb = xfs_dabuf_nfsb(mp, whichfork);
- struct xfs_bmbt_irec irec, *irecs = &irec;
- struct xfs_buf_map *map = *mapp;
- xfs_fileoff_t off = bno;
- int error = 0, nirecs, i;
- if (nfsb > 1)
- irecs = kmem_zalloc(sizeof(irec) * nfsb, KM_NOFS);
- nirecs = nfsb;
- error = xfs_bmapi_read(dp, bno, nfsb, irecs, &nirecs,
- xfs_bmapi_aflag(whichfork));
- if (error)
- goto out_free_irecs;
- /*
- * Use the caller provided map for the single map case, else allocate a
- * larger one that needs to be free by the caller.
- */
- if (nirecs > 1) {
- map = kmem_zalloc(nirecs * sizeof(struct xfs_buf_map), KM_NOFS);
- if (!map) {
- error = -ENOMEM;
- goto out_free_irecs;
- }
- *mapp = map;
- }
- for (i = 0; i < nirecs; i++) {
- if (irecs[i].br_startblock == HOLESTARTBLOCK ||
- irecs[i].br_startblock == DELAYSTARTBLOCK)
- goto invalid_mapping;
- if (off != irecs[i].br_startoff)
- goto invalid_mapping;
- map[i].bm_bn = XFS_FSB_TO_DADDR(mp, irecs[i].br_startblock);
- map[i].bm_len = XFS_FSB_TO_BB(mp, irecs[i].br_blockcount);
- off += irecs[i].br_blockcount;
- }
- if (off != bno + nfsb)
- goto invalid_mapping;
- *nmaps = nirecs;
- out_free_irecs:
- if (irecs != &irec)
- kmem_free(irecs);
- return error;
- invalid_mapping:
- /* Caller ok with no mapping. */
- if (XFS_IS_CORRUPT(mp, !(flags & XFS_DABUF_MAP_HOLE_OK))) {
- error = -EFSCORRUPTED;
- if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
- xfs_alert(mp, "%s: bno %u inode %llu",
- __func__, bno, dp->i_ino);
- for (i = 0; i < nirecs; i++) {
- xfs_alert(mp,
- "[%02d] br_startoff %lld br_startblock %lld br_blockcount %lld br_state %d",
- i, irecs[i].br_startoff,
- irecs[i].br_startblock,
- irecs[i].br_blockcount,
- irecs[i].br_state);
- }
- }
- } else {
- *nmaps = 0;
- }
- goto out_free_irecs;
- }
- /*
- * Get a buffer for the dir/attr block.
- */
- int
- xfs_da_get_buf(
- struct xfs_trans *tp,
- struct xfs_inode *dp,
- xfs_dablk_t bno,
- struct xfs_buf **bpp,
- int whichfork)
- {
- struct xfs_mount *mp = dp->i_mount;
- struct xfs_buf *bp;
- struct xfs_buf_map map, *mapp = ↦
- int nmap = 1;
- int error;
- *bpp = NULL;
- error = xfs_dabuf_map(dp, bno, 0, whichfork, &mapp, &nmap);
- if (error || nmap == 0)
- goto out_free;
- error = xfs_trans_get_buf_map(tp, mp->m_ddev_targp, mapp, nmap, 0, &bp);
- if (error)
- goto out_free;
- *bpp = bp;
- out_free:
- if (mapp != &map)
- kmem_free(mapp);
- return error;
- }
- /*
- * Get a buffer for the dir/attr block, fill in the contents.
- */
- int
- xfs_da_read_buf(
- struct xfs_trans *tp,
- struct xfs_inode *dp,
- xfs_dablk_t bno,
- unsigned int flags,
- struct xfs_buf **bpp,
- int whichfork,
- const struct xfs_buf_ops *ops)
- {
- struct xfs_mount *mp = dp->i_mount;
- struct xfs_buf *bp;
- struct xfs_buf_map map, *mapp = ↦
- int nmap = 1;
- int error;
- *bpp = NULL;
- error = xfs_dabuf_map(dp, bno, flags, whichfork, &mapp, &nmap);
- if (error || !nmap)
- goto out_free;
- error = xfs_trans_read_buf_map(mp, tp, mp->m_ddev_targp, mapp, nmap, 0,
- &bp, ops);
- if (error)
- goto out_free;
- if (whichfork == XFS_ATTR_FORK)
- xfs_buf_set_ref(bp, XFS_ATTR_BTREE_REF);
- else
- xfs_buf_set_ref(bp, XFS_DIR_BTREE_REF);
- *bpp = bp;
- out_free:
- if (mapp != &map)
- kmem_free(mapp);
- return error;
- }
- /*
- * Readahead the dir/attr block.
- */
- int
- xfs_da_reada_buf(
- struct xfs_inode *dp,
- xfs_dablk_t bno,
- unsigned int flags,
- int whichfork,
- const struct xfs_buf_ops *ops)
- {
- struct xfs_buf_map map;
- struct xfs_buf_map *mapp;
- int nmap;
- int error;
- mapp = ↦
- nmap = 1;
- error = xfs_dabuf_map(dp, bno, flags, whichfork, &mapp, &nmap);
- if (error || !nmap)
- goto out_free;
- xfs_buf_readahead_map(dp->i_mount->m_ddev_targp, mapp, nmap, ops);
- out_free:
- if (mapp != &map)
- kmem_free(mapp);
- return error;
- }
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