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xfs_dir2_node.c
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/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* Copyright (c) 2013 Red Hat, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_log.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"
#include "xfs_buf_item.h"
#include "xfs_cksum.h"
/*
* Function declarations.
*/
static int xfs_dir2_leafn_add(struct xfs_buf *bp, xfs_da_args_t *args,
int index);
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, struct xfs_buf *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);
/*
* Check internal consistency of a leafn block.
*/
#ifdef DEBUG
#define xfs_dir3_leaf_check(mp, bp) \
do { \
if (!xfs_dir3_leafn_check((mp), (bp))) \
ASSERT(0); \
} while (0);
static bool
xfs_dir3_leafn_check(
struct xfs_mount *mp,
struct xfs_buf *bp)
{
struct xfs_dir2_leaf *leaf = bp->b_addr;
struct xfs_dir3_icleaf_hdr leafhdr;
xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
if (leafhdr.magic == XFS_DIR3_LEAFN_MAGIC) {
struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
return false;
} else if (leafhdr.magic != XFS_DIR2_LEAFN_MAGIC)
return false;
return xfs_dir3_leaf_check_int(mp, &leafhdr, leaf);
}
#else
#define xfs_dir3_leaf_check(mp, bp)
#endif
static bool
xfs_dir3_free_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_dir2_free_hdr *hdr = bp->b_addr;
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
if (hdr3->magic != cpu_to_be32(XFS_DIR3_FREE_MAGIC))
return false;
if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_uuid))
return false;
if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
return false;
} else {
if (hdr->magic != cpu_to_be32(XFS_DIR2_FREE_MAGIC))
return false;
}
/* XXX: should bounds check the xfs_dir3_icfree_hdr here */
return true;
}
static void
xfs_dir3_free_read_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
if ((xfs_sb_version_hascrc(&mp->m_sb) &&
!xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
XFS_DIR3_FREE_CRC_OFF)) ||
!xfs_dir3_free_verify(bp)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
xfs_buf_ioerror(bp, EFSCORRUPTED);
}
}
static void
xfs_dir3_free_write_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_buf_log_item *bip = bp->b_fspriv;
struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
if (!xfs_dir3_free_verify(bp)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
xfs_buf_ioerror(bp, EFSCORRUPTED);
return;
}
if (!xfs_sb_version_hascrc(&mp->m_sb))
return;
if (bip)
hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn);
xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), XFS_DIR3_FREE_CRC_OFF);
}
const struct xfs_buf_ops xfs_dir3_free_buf_ops = {
.verify_read = xfs_dir3_free_read_verify,
.verify_write = xfs_dir3_free_write_verify,
};
static int
__xfs_dir3_free_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
xfs_daddr_t mappedbno,
struct xfs_buf **bpp)
{
int err;
err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
XFS_DATA_FORK, &xfs_dir3_free_buf_ops);
/* try read returns without an error or *bpp if it lands in a hole */
if (!err && tp && *bpp)
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_FREE_BUF);
return err;
}
int
xfs_dir2_free_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
struct xfs_buf **bpp)
{
return __xfs_dir3_free_read(tp, dp, fbno, -1, bpp);
}
static int
xfs_dir2_free_try_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
struct xfs_buf **bpp)
{
return __xfs_dir3_free_read(tp, dp, fbno, -2, bpp);
}
void
xfs_dir3_free_hdr_from_disk(
struct xfs_dir3_icfree_hdr *to,
struct xfs_dir2_free *from)
{
if (from->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC)) {
to->magic = be32_to_cpu(from->hdr.magic);
to->firstdb = be32_to_cpu(from->hdr.firstdb);
to->nvalid = be32_to_cpu(from->hdr.nvalid);
to->nused = be32_to_cpu(from->hdr.nused);
} else {
struct xfs_dir3_free_hdr *hdr3 = (struct xfs_dir3_free_hdr *)from;
to->magic = be32_to_cpu(hdr3->hdr.magic);
to->firstdb = be32_to_cpu(hdr3->firstdb);
to->nvalid = be32_to_cpu(hdr3->nvalid);
to->nused = be32_to_cpu(hdr3->nused);
}
ASSERT(to->magic == XFS_DIR2_FREE_MAGIC ||
to->magic == XFS_DIR3_FREE_MAGIC);
}
static void
xfs_dir3_free_hdr_to_disk(
struct xfs_dir2_free *to,
struct xfs_dir3_icfree_hdr *from)
{
ASSERT(from->magic == XFS_DIR2_FREE_MAGIC ||
from->magic == XFS_DIR3_FREE_MAGIC);
if (from->magic == XFS_DIR2_FREE_MAGIC) {
to->hdr.magic = cpu_to_be32(from->magic);
to->hdr.firstdb = cpu_to_be32(from->firstdb);
to->hdr.nvalid = cpu_to_be32(from->nvalid);
to->hdr.nused = cpu_to_be32(from->nused);
} else {
struct xfs_dir3_free_hdr *hdr3 = (struct xfs_dir3_free_hdr *)to;
hdr3->hdr.magic = cpu_to_be32(from->magic);
hdr3->firstdb = cpu_to_be32(from->firstdb);
hdr3->nvalid = cpu_to_be32(from->nvalid);
hdr3->nused = cpu_to_be32(from->nused);
}
}
static int
xfs_dir3_free_get_buf(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dir2_db_t fbno,
struct xfs_buf **bpp)
{
struct xfs_mount *mp = dp->i_mount;
struct xfs_buf *bp;
int error;
struct xfs_dir3_icfree_hdr hdr;
error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, fbno),
-1, &bp, XFS_DATA_FORK);
if (error)
return error;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_FREE_BUF);
bp->b_ops = &xfs_dir3_free_buf_ops;
/*
* Initialize the new block to be empty, and remember
* its first slot as our empty slot.
*/
memset(bp->b_addr, 0, sizeof(struct xfs_dir3_free_hdr));
memset(&hdr, 0, sizeof(hdr));
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_free_hdr *hdr3 = bp->b_addr;
hdr.magic = XFS_DIR3_FREE_MAGIC;
hdr3->hdr.blkno = cpu_to_be64(bp->b_bn);
hdr3->hdr.owner = cpu_to_be64(dp->i_ino);
uuid_copy(&hdr3->hdr.uuid, &mp->m_sb.sb_uuid);
} else
hdr.magic = XFS_DIR2_FREE_MAGIC;
xfs_dir3_free_hdr_to_disk(bp->b_addr, &hdr);
*bpp = bp;
return 0;
}
/*
* Log entries from a freespace block.
*/
STATIC void
xfs_dir2_free_log_bests(
struct xfs_trans *tp,
struct xfs_buf *bp,
int first, /* first entry to log */
int last) /* last entry to log */
{
xfs_dir2_free_t *free; /* freespace structure */
__be16 *bests;
free = bp->b_addr;
bests = xfs_dir3_free_bests_p(tp->t_mountp, free);
ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC) ||
free->hdr.magic == cpu_to_be32(XFS_DIR3_FREE_MAGIC));
xfs_trans_log_buf(tp, bp,
(uint)((char *)&bests[first] - (char *)free),
(uint)((char *)&bests[last] - (char *)free +
sizeof(bests[0]) - 1));
}
/*
* Log header from a freespace block.
*/
static void
xfs_dir2_free_log_header(
struct xfs_trans *tp,
struct xfs_buf *bp)
{
xfs_dir2_free_t *free; /* freespace structure */
free = bp->b_addr;
ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC) ||
free->hdr.magic == cpu_to_be32(XFS_DIR3_FREE_MAGIC));
xfs_trans_log_buf(tp, bp, 0, xfs_dir3_free_hdr_size(tp->t_mountp) - 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 */
struct xfs_buf *lbp) /* leaf buffer */
{
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return value */
struct xfs_buf *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 */
struct xfs_dir3_icfree_hdr freehdr;
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.
*/
error = xfs_dir3_free_get_buf(tp, dp, fdb, &fbp);
if (error)
return error;
free = fbp->b_addr;
xfs_dir3_free_hdr_from_disk(&freehdr, free);
leaf = lbp->b_addr;
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
ASSERT(be32_to_cpu(ltp->bestcount) <=
(uint)dp->i_d.di_size / mp->m_dirblksize);
/*
* Copy freespace entries from the leaf block to the new block.
* Count active entries.
*/
from = xfs_dir2_leaf_bests_p(ltp);
to = xfs_dir3_free_bests_p(mp, free);
for (i = n = 0; i < be32_to_cpu(ltp->bestcount); i++, from++, to++) {
if ((off = be16_to_cpu(*from)) != NULLDATAOFF)
n++;
*to = cpu_to_be16(off);
}
/*
* Now initialize the freespace block header.
*/
freehdr.nused = n;
freehdr.nvalid = be32_to_cpu(ltp->bestcount);
xfs_dir3_free_hdr_to_disk(fbp->b_addr, &freehdr);
xfs_dir2_free_log_bests(tp, fbp, 0, freehdr.nvalid - 1);
xfs_dir2_free_log_header(tp, fbp);
/*
* Converting the leaf to a leafnode is just a matter of changing the
* magic number and the ops. Do the change directly to the buffer as
* it's less work (and less code) than decoding the header to host
* format and back again.
*/
if (leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC))
leaf->hdr.info.magic = cpu_to_be16(XFS_DIR2_LEAFN_MAGIC);
else
leaf->hdr.info.magic = cpu_to_be16(XFS_DIR3_LEAFN_MAGIC);
lbp->b_ops = &xfs_dir3_leafn_buf_ops;
xfs_trans_buf_set_type(tp, lbp, XFS_BLFT_DIR_LEAFN_BUF);
xfs_dir3_leaf_log_header(tp, lbp);
xfs_dir3_leaf_check(mp, 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(
struct xfs_buf *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 */
struct xfs_dir3_icleaf_hdr leafhdr;
struct xfs_dir2_leaf_entry *ents;
trace_xfs_dir2_leafn_add(args, index);
dp = args->dp;
mp = dp->i_mount;
tp = args->trans;
leaf = bp->b_addr;
xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
ents = xfs_dir3_leaf_ents_p(leaf);
/*
* 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 (leafhdr.count == xfs_dir3_max_leaf_ents(mp, leaf)) {
if (!leafhdr.stale)
return XFS_ERROR(ENOSPC);
compact = leafhdr.stale > 1;
} else
compact = 0;
ASSERT(index == 0 || be32_to_cpu(ents[index - 1].hashval) <= args->hashval);
ASSERT(index == leafhdr.count ||
be32_to_cpu(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_dir3_leaf_compact_x1(&leafhdr, ents, &index, &lowstale,
&highstale, &lfloglow, &lfloghigh);
else if (leafhdr.stale) {
/*
* Set impossible logging indices for this case.
*/
lfloglow = leafhdr.count;
lfloghigh = -1;
}
/*
* Insert the new entry, log everything.
*/
lep = xfs_dir3_leaf_find_entry(&leafhdr, ents, 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_dir3_leaf_hdr_to_disk(leaf, &leafhdr);
xfs_dir3_leaf_log_header(tp, bp);
xfs_dir3_leaf_log_ents(tp, bp, lfloglow, lfloghigh);
xfs_dir3_leaf_check(mp, bp);
return 0;
}
#ifdef DEBUG
static void
xfs_dir2_free_hdr_check(
struct xfs_mount *mp,
struct xfs_buf *bp,
xfs_dir2_db_t db)
{
struct xfs_dir3_icfree_hdr hdr;
xfs_dir3_free_hdr_from_disk(&hdr, bp->b_addr);
ASSERT((hdr.firstdb % xfs_dir3_free_max_bests(mp)) == 0);
ASSERT(hdr.firstdb <= db);
ASSERT(db < hdr.firstdb + hdr.nvalid);
}
#else
#define xfs_dir2_free_hdr_check(mp, dp, db)
#endif /* DEBUG */
/*
* Return the last hash value in the leaf.
* Stale entries are ok.
*/
xfs_dahash_t /* hash value */
xfs_dir2_leafn_lasthash(
struct xfs_buf *bp, /* leaf buffer */
int *count) /* count of entries in leaf */
{
struct xfs_dir2_leaf *leaf = bp->b_addr;
struct xfs_dir2_leaf_entry *ents;
struct xfs_dir3_icleaf_hdr leafhdr;
xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
ASSERT(leafhdr.magic == XFS_DIR2_LEAFN_MAGIC ||
leafhdr.magic == XFS_DIR3_LEAFN_MAGIC);
if (count)
*count = leafhdr.count;
if (!leafhdr.count)
return 0;
ents = xfs_dir3_leaf_ents_p(leaf);
return be32_to_cpu(ents[leafhdr.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(
struct xfs_buf *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 */
{
struct xfs_buf *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 */
struct xfs_dir2_leaf_entry *ents;
struct xfs_dir3_icleaf_hdr leafhdr;
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
leaf = bp->b_addr;
xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
ents = xfs_dir3_leaf_ents_p(leaf);
xfs_dir3_leaf_check(mp, bp);
ASSERT(leafhdr.count > 0);
/*
* 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->b_addr;
ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC) ||
free->hdr.magic == cpu_to_be32(XFS_DIR3_FREE_MAGIC));
}
length = xfs_dir2_data_entsize(args->namelen);
/*
* Loop over leaf entries with the right hash value.
*/
for (lep = &ents[index];
index < leafhdr.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) {
__be16 *bests;
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_trans_brelse(tp, curbp);
error = xfs_dir2_free_read(tp, dp,
xfs_dir2_db_to_da(mp, newfdb),
&curbp);
if (error)
return error;
free = curbp->b_addr;
xfs_dir2_free_hdr_check(mp, curbp, curdb);
}
/*
* Get the index for our entry.
*/
fi = xfs_dir2_db_to_fdindex(mp, curdb);
/*
* If it has room, return it.
*/
bests = xfs_dir3_free_bests_p(mp, free);
if (unlikely(bests[fi] == cpu_to_be16(NULLDATAOFF))) {
XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int",
XFS_ERRLEVEL_LOW, mp);
if (curfdb != newfdb)
xfs_trans_brelse(tp, curbp);
return XFS_ERROR(EFSCORRUPTED);
}
curfdb = newfdb;
if (be16_to_cpu(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;
/*
* Important: this magic number is not in the buffer - it's for
* buffer type information and therefore only the free/data type
* matters here, not whether CRCs are enabled or not.
*/
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(
struct xfs_buf *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 */
{
struct xfs_buf *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 */
struct xfs_dir2_leaf_entry *ents;
struct xfs_dir3_icleaf_hdr leafhdr;
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
leaf = bp->b_addr;
xfs_dir3_leaf_hdr_from_disk(&leafhdr, leaf);
ents = xfs_dir3_leaf_ents_p(leaf);
xfs_dir3_leaf_check(mp, bp);
ASSERT(leafhdr.count > 0);
/*
* 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 = &ents[index];
index < leafhdr.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_trans_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_dir3_data_read(tp, dp,
xfs_dir2_db_to_da(mp, newdb),
-1, &curbp);
if (error)
return error;
}
xfs_dir3_data_check(dp, curbp);
curdb = newdb;
}
/*
* Point to the data entry.
*/
dep = (xfs_dir2_data_entry_t *)((char *)curbp->b_addr +
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_trans_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->b_addr);
state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
curbp->b_ops = &xfs_dir3_data_buf_ops;
xfs_trans_buf_set_type(tp, curbp, XFS_BLFT_DIR_DATA_BUF);
if (cmp == XFS_CMP_EXACT)
return XFS_ERROR(EEXIST);
}
}
ASSERT(index == leafhdr.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;
curbp->b_ops = &xfs_dir3_data_buf_ops;
xfs_trans_buf_set_type(tp, curbp, XFS_BLFT_DIR_DATA_BUF);
} else {
/* If the curbp is not the CI match block, drop it */
if (state->extrablk.bp != curbp)
xfs_trans_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(
struct xfs_buf *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_dir3_leafn_moveents(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *bp_s, /* source */
struct xfs_dir3_icleaf_hdr *shdr,
struct xfs_dir2_leaf_entry *sents,
int start_s,/* source leaf index */
struct xfs_buf *bp_d, /* destination */
struct xfs_dir3_icleaf_hdr *dhdr,
struct xfs_dir2_leaf_entry *dents,
int start_d,/* destination leaf index */
int count) /* count of leaves to copy */
{
struct xfs_trans *tp = args->trans;
int stale; /* count stale leaves copied */
trace_xfs_dir2_leafn_moveents(args, start_s, start_d, count);
/*
* Silently return if nothing to do.
*/
if (count == 0)
return;
/*
* 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 < dhdr->count) {
memmove(&dents[start_d + count], &dents[start_d],
(dhdr->count - start_d) * sizeof(xfs_dir2_leaf_entry_t));
xfs_dir3_leaf_log_ents(tp, bp_d, start_d + count,
count + dhdr->count - 1);
}
/*
* If the source has stale leaves, count the ones in the copy range
* so we can update the header correctly.
*/
if (shdr->stale) {
int i; /* temp leaf index */
for (i = start_s, stale = 0; i < start_s + count; i++) {
if (sents[i].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
stale++;
}
} else
stale = 0;
/*
* Copy the leaf entries from source to destination.
*/
memcpy(&dents[start_d], &sents[start_s],
count * sizeof(xfs_dir2_leaf_entry_t));
xfs_dir3_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 < shdr->count) {
memmove(&sents[start_s], &sents[start_s + count],
count * sizeof(xfs_dir2_leaf_entry_t));
xfs_dir3_leaf_log_ents(tp, bp_s, start_s, start_s + count - 1);
}
/*
* Update the headers and log them.
*/
shdr->count -= count;
shdr->stale -= stale;
dhdr->count += count;
dhdr->stale += stale;
}
/*
* 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(
struct xfs_buf *leaf1_bp, /* leaf1 buffer */
struct xfs_buf *leaf2_bp) /* leaf2 buffer */
{
struct xfs_dir2_leaf *leaf1 = leaf1_bp->b_addr;
struct xfs_dir2_leaf *leaf2 = leaf2_bp->b_addr;
struct xfs_dir2_leaf_entry *ents1;
struct xfs_dir2_leaf_entry *ents2;
struct xfs_dir3_icleaf_hdr hdr1;
struct xfs_dir3_icleaf_hdr hdr2;
xfs_dir3_leaf_hdr_from_disk(&hdr1, leaf1);
xfs_dir3_leaf_hdr_from_disk(&hdr2, leaf2);
ents1 = xfs_dir3_leaf_ents_p(leaf1);
ents2 = xfs_dir3_leaf_ents_p(leaf2);
if (hdr1.count > 0 && hdr2.count > 0 &&
(be32_to_cpu(ents2[0].hashval) < be32_to_cpu(ents1[0].hashval) ||
be32_to_cpu(ents2[hdr2.count - 1].hashval) <
be32_to_cpu(ents1[hdr1.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 */
#if defined(DEBUG) || defined(XFS_WARN)
int oldstale; /* old count of stale leaves */
#endif
int oldsum; /* old total leaf count */