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OpenCloudOS-Kernel/fs/xfs/xfs_dir2_leaf.c

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/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.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"
/*
* Local function declarations.
*/
#ifdef DEBUG
static void xfs_dir2_leaf_check(struct xfs_inode *dp, struct xfs_buf *bp);
#else
#define xfs_dir2_leaf_check(dp, bp)
#endif
static int xfs_dir2_leaf_lookup_int(xfs_da_args_t *args, struct xfs_buf **lbpp,
int *indexp, struct xfs_buf **dbpp);
static void xfs_dir2_leaf_log_bests(struct xfs_trans *tp, struct xfs_buf *bp,
int first, int last);
static void xfs_dir2_leaf_log_tail(struct xfs_trans *tp, struct xfs_buf *bp);
static void
xfs_dir2_leaf_verify(
struct xfs_buf *bp,
__be16 magic)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_dir2_leaf_hdr *hdr = bp->b_addr;
int block_ok = 0;
block_ok = hdr->info.magic == magic;
if (!block_ok) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, hdr);
xfs_buf_ioerror(bp, EFSCORRUPTED);
}
}
static void
xfs_dir2_leaf1_read_verify(
struct xfs_buf *bp)
{
xfs_dir2_leaf_verify(bp, cpu_to_be16(XFS_DIR2_LEAF1_MAGIC));
}
static void
xfs_dir2_leaf1_write_verify(
struct xfs_buf *bp)
{
xfs_dir2_leaf_verify(bp, cpu_to_be16(XFS_DIR2_LEAF1_MAGIC));
}
void
xfs_dir2_leafn_read_verify(
struct xfs_buf *bp)
{
xfs_dir2_leaf_verify(bp, cpu_to_be16(XFS_DIR2_LEAFN_MAGIC));
}
void
xfs_dir2_leafn_write_verify(
struct xfs_buf *bp)
{
xfs_dir2_leaf_verify(bp, cpu_to_be16(XFS_DIR2_LEAFN_MAGIC));
}
static const struct xfs_buf_ops xfs_dir2_leaf1_buf_ops = {
.verify_read = xfs_dir2_leaf1_read_verify,
.verify_write = xfs_dir2_leaf1_write_verify,
};
const struct xfs_buf_ops xfs_dir2_leafn_buf_ops = {
.verify_read = xfs_dir2_leafn_read_verify,
.verify_write = xfs_dir2_leafn_write_verify,
};
static int
xfs_dir2_leaf_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
xfs_daddr_t mappedbno,
struct xfs_buf **bpp)
{
return xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
XFS_DATA_FORK, &xfs_dir2_leaf1_buf_ops);
}
int
xfs_dir2_leafn_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
xfs_daddr_t mappedbno,
struct xfs_buf **bpp)
{
return xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
XFS_DATA_FORK, &xfs_dir2_leafn_buf_ops);
}
/*
* Convert a block form directory to a leaf form directory.
*/
int /* error */
xfs_dir2_block_to_leaf(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *dbp) /* input block's buffer */
{
__be16 *bestsp; /* leaf's bestsp entries */
xfs_dablk_t blkno; /* leaf block's bno */
xfs_dir2_data_hdr_t *hdr; /* block header */
xfs_dir2_leaf_entry_t *blp; /* block's leaf entries */
xfs_dir2_block_tail_t *btp; /* block's tail */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
struct xfs_buf *lbp; /* leaf block's buffer */
xfs_dir2_db_t ldb; /* leaf block's bno */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_tail_t *ltp; /* leaf's tail */
xfs_mount_t *mp; /* filesystem mount point */
int needlog; /* need to log block header */
int needscan; /* need to rescan bestfree */
xfs_trans_t *tp; /* transaction pointer */
trace_xfs_dir2_block_to_leaf(args);
dp = args->dp;
mp = dp->i_mount;
tp = args->trans;
/*
* Add the leaf block to the inode.
* This interface will only put blocks in the leaf/node range.
* Since that's empty now, we'll get the root (block 0 in range).
*/
if ((error = xfs_da_grow_inode(args, &blkno))) {
return error;
}
ldb = xfs_dir2_da_to_db(mp, blkno);
ASSERT(ldb == XFS_DIR2_LEAF_FIRSTDB(mp));
/*
* Initialize the leaf block, get a buffer for it.
*/
if ((error = xfs_dir2_leaf_init(args, ldb, &lbp, XFS_DIR2_LEAF1_MAGIC))) {
return error;
}
ASSERT(lbp != NULL);
leaf = lbp->b_addr;
hdr = dbp->b_addr;
xfs_dir2_data_check(dp, dbp);
btp = xfs_dir2_block_tail_p(mp, hdr);
blp = xfs_dir2_block_leaf_p(btp);
/*
* Set the counts in the leaf header.
*/
leaf->hdr.count = cpu_to_be16(be32_to_cpu(btp->count));
leaf->hdr.stale = cpu_to_be16(be32_to_cpu(btp->stale));
/*
* Could compact these but I think we always do the conversion
* after squeezing out stale entries.
*/
memcpy(leaf->ents, blp, be32_to_cpu(btp->count) * sizeof(xfs_dir2_leaf_entry_t));
xfs_dir2_leaf_log_ents(tp, lbp, 0, be16_to_cpu(leaf->hdr.count) - 1);
needscan = 0;
needlog = 1;
/*
* Make the space formerly occupied by the leaf entries and block
* tail be free.
*/
xfs_dir2_data_make_free(tp, dbp,
(xfs_dir2_data_aoff_t)((char *)blp - (char *)hdr),
(xfs_dir2_data_aoff_t)((char *)hdr + mp->m_dirblksize -
(char *)blp),
&needlog, &needscan);
/*
* Fix up the block header, make it a data block.
*/
dbp->b_ops = &xfs_dir2_data_buf_ops;
hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
if (needscan)
xfs_dir2_data_freescan(mp, hdr, &needlog);
/*
* Set up leaf tail and bests table.
*/
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
ltp->bestcount = cpu_to_be32(1);
bestsp = xfs_dir2_leaf_bests_p(ltp);
bestsp[0] = hdr->bestfree[0].length;
/*
* Log the data header and leaf bests table.
*/
if (needlog)
xfs_dir2_data_log_header(tp, dbp);
xfs_dir2_leaf_check(dp, lbp);
xfs_dir2_data_check(dp, dbp);
xfs_dir2_leaf_log_bests(tp, lbp, 0, 0);
return 0;
}
STATIC void
xfs_dir2_leaf_find_stale(
struct xfs_dir2_leaf *leaf,
int index,
int *lowstale,
int *highstale)
{
/*
* Find the first stale entry before our index, if any.
*/
for (*lowstale = index - 1; *lowstale >= 0; --*lowstale) {
if (leaf->ents[*lowstale].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
break;
}
/*
* Find the first stale entry at or after our index, if any.
* Stop if the result would require moving more entries than using
* lowstale.
*/
for (*highstale = index;
*highstale < be16_to_cpu(leaf->hdr.count);
++*highstale) {
if (leaf->ents[*highstale].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
break;
if (*lowstale >= 0 && index - *lowstale <= *highstale - index)
break;
}
}
struct xfs_dir2_leaf_entry *
xfs_dir2_leaf_find_entry(
xfs_dir2_leaf_t *leaf, /* leaf structure */
int index, /* leaf table position */
int compact, /* need to compact leaves */
int lowstale, /* index of prev stale leaf */
int highstale, /* index of next stale leaf */
int *lfloglow, /* low leaf logging index */
int *lfloghigh) /* high leaf logging index */
{
if (!leaf->hdr.stale) {
xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */
/*
* Now we need to make room to insert the leaf entry.
*
* If there are no stale entries, just insert a hole at index.
*/
lep = &leaf->ents[index];
if (index < be16_to_cpu(leaf->hdr.count))
memmove(lep + 1, lep,
(be16_to_cpu(leaf->hdr.count) - index) *
sizeof(*lep));
/*
* Record low and high logging indices for the leaf.
*/
*lfloglow = index;
*lfloghigh = be16_to_cpu(leaf->hdr.count);
be16_add_cpu(&leaf->hdr.count, 1);
return lep;
}
/*
* There are stale entries.
*
* We will use one of them for the new entry. It's probably not at
* the right location, so we'll have to shift some up or down first.
*
* If we didn't compact before, we need to find the nearest stale
* entries before and after our insertion point.
*/
if (compact == 0)
xfs_dir2_leaf_find_stale(leaf, index, &lowstale, &highstale);
/*
* If the low one is better, use it.
*/
if (lowstale >= 0 &&
(highstale == be16_to_cpu(leaf->hdr.count) ||
index - lowstale - 1 < highstale - index)) {
ASSERT(index - lowstale - 1 >= 0);
ASSERT(leaf->ents[lowstale].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR));
/*
* Copy entries up to cover the stale entry and make room
* for the new entry.
*/
if (index - lowstale - 1 > 0) {
memmove(&leaf->ents[lowstale],
&leaf->ents[lowstale + 1],
(index - lowstale - 1) *
sizeof(xfs_dir2_leaf_entry_t));
}
*lfloglow = MIN(lowstale, *lfloglow);
*lfloghigh = MAX(index - 1, *lfloghigh);
be16_add_cpu(&leaf->hdr.stale, -1);
return &leaf->ents[index - 1];
}
/*
* The high one is better, so use that one.
*/
ASSERT(highstale - index >= 0);
ASSERT(leaf->ents[highstale].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR));
/*
* Copy entries down to cover the stale entry and make room for the
* new entry.
*/
if (highstale - index > 0) {
memmove(&leaf->ents[index + 1],
&leaf->ents[index],
(highstale - index) * sizeof(xfs_dir2_leaf_entry_t));
}
*lfloglow = MIN(index, *lfloglow);
*lfloghigh = MAX(highstale, *lfloghigh);
be16_add_cpu(&leaf->hdr.stale, -1);
return &leaf->ents[index];
}
/*
* Add an entry to a leaf form directory.
*/
int /* error */
xfs_dir2_leaf_addname(
xfs_da_args_t *args) /* operation arguments */
{
__be16 *bestsp; /* freespace table in leaf */
int compact; /* need to compact leaves */
xfs_dir2_data_hdr_t *hdr; /* data block header */
struct xfs_buf *dbp; /* data block buffer */
xfs_dir2_data_entry_t *dep; /* data block entry */
xfs_inode_t *dp; /* incore directory inode */
xfs_dir2_data_unused_t *dup; /* data unused entry */
int error; /* error return value */
int grown; /* allocated new data block */
int highstale; /* index of next stale leaf */
int i; /* temporary, index */
int index; /* leaf table position */
struct xfs_buf *lbp; /* leaf's buffer */
xfs_dir2_leaf_t *leaf; /* leaf structure */
int length; /* length of new entry */
xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */
int lfloglow; /* low leaf logging index */
int lfloghigh; /* high leaf logging index */
int lowstale; /* index of prev stale leaf */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */
xfs_mount_t *mp; /* filesystem mount point */
int needbytes; /* leaf block bytes needed */
int needlog; /* need to log data header */
int needscan; /* need to rescan data free */
__be16 *tagp; /* end of data entry */
xfs_trans_t *tp; /* transaction pointer */
xfs_dir2_db_t use_block; /* data block number */
trace_xfs_dir2_leaf_addname(args);
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
error = xfs_dir2_leaf_read(tp, dp, mp->m_dirleafblk, -1, &lbp);
if (error)
return error;
/*
* Look up the entry by hash value and name.
* We know it's not there, our caller has already done a lookup.
* So the index is of the entry to insert in front of.
* But if there are dup hash values the index is of the first of those.
*/
index = xfs_dir2_leaf_search_hash(args, lbp);
leaf = lbp->b_addr;
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
bestsp = xfs_dir2_leaf_bests_p(ltp);
length = xfs_dir2_data_entsize(args->namelen);
/*
* See if there are any entries with the same hash value
* and space in their block for the new entry.
* This is good because it puts multiple same-hash value entries
* in a data block, improving the lookup of those entries.
*/
for (use_block = -1, lep = &leaf->ents[index];
index < be16_to_cpu(leaf->hdr.count) && be32_to_cpu(lep->hashval) == args->hashval;
index++, lep++) {
if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
continue;
i = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
ASSERT(i < be32_to_cpu(ltp->bestcount));
ASSERT(bestsp[i] != cpu_to_be16(NULLDATAOFF));
if (be16_to_cpu(bestsp[i]) >= length) {
use_block = i;
break;
}
}
/*
* Didn't find a block yet, linear search all the data blocks.
*/
if (use_block == -1) {
for (i = 0; i < be32_to_cpu(ltp->bestcount); i++) {
/*
* Remember a block we see that's missing.
*/
if (bestsp[i] == cpu_to_be16(NULLDATAOFF) &&
use_block == -1)
use_block = i;
else if (be16_to_cpu(bestsp[i]) >= length) {
use_block = i;
break;
}
}
}
/*
* How many bytes do we need in the leaf block?
*/
needbytes = 0;
if (!leaf->hdr.stale)
needbytes += sizeof(xfs_dir2_leaf_entry_t);
if (use_block == -1)
needbytes += sizeof(xfs_dir2_data_off_t);
/*
* Now kill use_block if it refers to a missing block, so we
* can use it as an indication of allocation needed.
*/
if (use_block != -1 && bestsp[use_block] == cpu_to_be16(NULLDATAOFF))
use_block = -1;
/*
* If we don't have enough free bytes but we can make enough
* by compacting out stale entries, we'll do that.
*/
if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] <
needbytes && be16_to_cpu(leaf->hdr.stale) > 1) {
compact = 1;
}
/*
* Otherwise if we don't have enough free bytes we need to
* convert to node form.
*/
else if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu(
leaf->hdr.count)] < needbytes) {
/*
* Just checking or no space reservation, give up.
*/
if ((args->op_flags & XFS_DA_OP_JUSTCHECK) ||
args->total == 0) {
xfs_trans_brelse(tp, lbp);
return XFS_ERROR(ENOSPC);
}
/*
* Convert to node form.
*/
error = xfs_dir2_leaf_to_node(args, lbp);
if (error)
return error;
/*
* Then add the new entry.
*/
return xfs_dir2_node_addname(args);
}
/*
* Otherwise it will fit without compaction.
*/
else
compact = 0;
/*
* If just checking, then it will fit unless we needed to allocate
* a new data block.
*/
if (args->op_flags & XFS_DA_OP_JUSTCHECK) {
xfs_trans_brelse(tp, lbp);
return use_block == -1 ? XFS_ERROR(ENOSPC) : 0;
}
/*
* If no allocations are allowed, return now before we've
* changed anything.
*/
if (args->total == 0 && use_block == -1) {
xfs_trans_brelse(tp, lbp);
return XFS_ERROR(ENOSPC);
}
/*
* Need to compact the leaf entries, removing stale ones.
* Leave one stale entry behind - the one closest to our
* insertion index - and we'll shift that one to our insertion
* point later.
*/
if (compact) {
xfs_dir2_leaf_compact_x1(lbp, &index, &lowstale, &highstale,
&lfloglow, &lfloghigh);
}
/*
* There are stale entries, so we'll need log-low and log-high
* impossibly bad values later.
*/
else if (be16_to_cpu(leaf->hdr.stale)) {
lfloglow = be16_to_cpu(leaf->hdr.count);
lfloghigh = -1;
}
/*
* If there was no data block space found, we need to allocate
* a new one.
*/
if (use_block == -1) {
/*
* Add the new data block.
*/
if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE,
&use_block))) {
xfs_trans_brelse(tp, lbp);
return error;
}
/*
* Initialize the block.
*/
if ((error = xfs_dir2_data_init(args, use_block, &dbp))) {
xfs_trans_brelse(tp, lbp);
return error;
}
/*
* If we're adding a new data block on the end we need to
* extend the bests table. Copy it up one entry.
*/
if (use_block >= be32_to_cpu(ltp->bestcount)) {
bestsp--;
memmove(&bestsp[0], &bestsp[1],
be32_to_cpu(ltp->bestcount) * sizeof(bestsp[0]));
be32_add_cpu(&ltp->bestcount, 1);
xfs_dir2_leaf_log_tail(tp, lbp);
xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
}
/*
* If we're filling in a previously empty block just log it.
*/
else
xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block);
hdr = dbp->b_addr;
bestsp[use_block] = hdr->bestfree[0].length;
grown = 1;
} else {
/*
* Already had space in some data block.
* Just read that one in.
*/
error = xfs_dir2_data_read(tp, dp,
xfs_dir2_db_to_da(mp, use_block),
-1, &dbp);
if (error) {
xfs_trans_brelse(tp, lbp);
return error;
}
hdr = dbp->b_addr;
grown = 0;
}
/*
* Point to the biggest freespace in our data block.
*/
dup = (xfs_dir2_data_unused_t *)
((char *)hdr + be16_to_cpu(hdr->bestfree[0].offset));
ASSERT(be16_to_cpu(dup->length) >= length);
needscan = needlog = 0;
/*
* Mark the initial part of our freespace in use for the new entry.
*/
xfs_dir2_data_use_free(tp, dbp, dup,
(xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length,
&needlog, &needscan);
/*
* Initialize our new entry (at last).
*/
dep = (xfs_dir2_data_entry_t *)dup;
dep->inumber = cpu_to_be64(args->inumber);
dep->namelen = args->namelen;
memcpy(dep->name, args->name, dep->namelen);
tagp = xfs_dir2_data_entry_tag_p(dep);
*tagp = cpu_to_be16((char *)dep - (char *)hdr);
/*
* Need to scan fix up the bestfree table.
*/
if (needscan)
xfs_dir2_data_freescan(mp, hdr, &needlog);
/*
* Need to log the data block's header.
*/
if (needlog)
xfs_dir2_data_log_header(tp, dbp);
xfs_dir2_data_log_entry(tp, dbp, dep);
/*
* If the bests table needs to be changed, do it.
* Log the change unless we've already done that.
*/
if (be16_to_cpu(bestsp[use_block]) != be16_to_cpu(hdr->bestfree[0].length)) {
bestsp[use_block] = hdr->bestfree[0].length;
if (!grown)
xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block);
}
lep = xfs_dir2_leaf_find_entry(leaf, index, compact, lowstale,
highstale, &lfloglow, &lfloghigh);
/*
* Fill in the new leaf entry.
*/
lep->hashval = cpu_to_be32(args->hashval);
lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(mp, use_block,
be16_to_cpu(*tagp)));
/*
* Log the leaf fields and give up the buffers.
*/
xfs_dir2_leaf_log_header(tp, lbp);
xfs_dir2_leaf_log_ents(tp, lbp, lfloglow, lfloghigh);
xfs_dir2_leaf_check(dp, lbp);
xfs_dir2_data_check(dp, dbp);
return 0;
}
#ifdef DEBUG
/*
* Check the internal consistency of a leaf1 block.
* Pop an assert if something is wrong.
*/
STATIC void
xfs_dir2_leaf_check(
struct xfs_inode *dp, /* incore directory inode */
struct xfs_buf *bp) /* leaf's buffer */
{
int i; /* leaf index */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */
xfs_mount_t *mp; /* filesystem mount point */
int stale; /* count of stale leaves */
leaf = bp->b_addr;
mp = dp->i_mount;
ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC));
/*
* This value is not restrictive enough.
* Should factor in the size of the bests table as well.
* We can deduce a value for that from di_size.
*/
ASSERT(be16_to_cpu(leaf->hdr.count) <= xfs_dir2_max_leaf_ents(mp));
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
/*
* Leaves and bests don't overlap.
*/
ASSERT((char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] <=
(char *)xfs_dir2_leaf_bests_p(ltp));
/*
* Check hash value order, count stale entries.
*/
for (i = stale = 0; i < be16_to_cpu(leaf->hdr.count); i++) {
if (i + 1 < be16_to_cpu(leaf->hdr.count))
ASSERT(be32_to_cpu(leaf->ents[i].hashval) <=
be32_to_cpu(leaf->ents[i + 1].hashval));
if (leaf->ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
stale++;
}
ASSERT(be16_to_cpu(leaf->hdr.stale) == stale);
}
#endif /* DEBUG */
/*
* Compact out any stale entries in the leaf.
* Log the header and changed leaf entries, if any.
*/
void
xfs_dir2_leaf_compact(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *bp) /* leaf buffer */
{
int from; /* source leaf index */
xfs_dir2_leaf_t *leaf; /* leaf structure */
int loglow; /* first leaf entry to log */
int to; /* target leaf index */
leaf = bp->b_addr;
if (!leaf->hdr.stale) {
return;
}
/*
* Compress out the stale entries in place.
*/
for (from = to = 0, loglow = -1; from < be16_to_cpu(leaf->hdr.count); from++) {
if (leaf->ents[from].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
continue;
/*
* Only actually copy the entries that are different.
*/
if (from > to) {
if (loglow == -1)
loglow = to;
leaf->ents[to] = leaf->ents[from];
}
to++;
}
/*
* Update and log the header, log the leaf entries.
*/
ASSERT(be16_to_cpu(leaf->hdr.stale) == from - to);
be16_add_cpu(&leaf->hdr.count, -(be16_to_cpu(leaf->hdr.stale)));
leaf->hdr.stale = 0;
xfs_dir2_leaf_log_header(args->trans, bp);
if (loglow != -1)
xfs_dir2_leaf_log_ents(args->trans, bp, loglow, to - 1);
}
/*
* Compact the leaf entries, removing stale ones.
* Leave one stale entry behind - the one closest to our
* insertion index - and the caller will shift that one to our insertion
* point later.
* Return new insertion index, where the remaining stale entry is,
* and leaf logging indices.
*/
void
xfs_dir2_leaf_compact_x1(
struct xfs_buf *bp, /* leaf buffer */
int *indexp, /* insertion index */
int *lowstalep, /* out: stale entry before us */
int *highstalep, /* out: stale entry after us */
int *lowlogp, /* out: low log index */
int *highlogp) /* out: high log index */
{
int from; /* source copy index */
int highstale; /* stale entry at/after index */
int index; /* insertion index */
int keepstale; /* source index of kept stale */
xfs_dir2_leaf_t *leaf; /* leaf structure */
int lowstale; /* stale entry before index */
int newindex=0; /* new insertion index */
int to; /* destination copy index */
leaf = bp->b_addr;
ASSERT(be16_to_cpu(leaf->hdr.stale) > 1);
index = *indexp;
xfs_dir2_leaf_find_stale(leaf, index, &lowstale, &highstale);
/*
* Pick the better of lowstale and highstale.
*/
if (lowstale >= 0 &&
(highstale == be16_to_cpu(leaf->hdr.count) ||
index - lowstale <= highstale - index))
keepstale = lowstale;
else
keepstale = highstale;
/*
* Copy the entries in place, removing all the stale entries
* except keepstale.
*/
for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) {
/*
* Notice the new value of index.
*/
if (index == from)
newindex = to;
if (from != keepstale &&
leaf->ents[from].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) {
if (from == to)
*lowlogp = to;
continue;
}
/*
* Record the new keepstale value for the insertion.
*/
if (from == keepstale)
lowstale = highstale = to;
/*
* Copy only the entries that have moved.
*/
if (from > to)
leaf->ents[to] = leaf->ents[from];
to++;
}
ASSERT(from > to);
/*
* If the insertion point was past the last entry,
* set the new insertion point accordingly.
*/
if (index == from)
newindex = to;
*indexp = newindex;
/*
* Adjust the leaf header values.
*/
be16_add_cpu(&leaf->hdr.count, -(from - to));
leaf->hdr.stale = cpu_to_be16(1);
/*
* Remember the low/high stale value only in the "right"
* direction.
*/
if (lowstale >= newindex)
lowstale = -1;
else
highstale = be16_to_cpu(leaf->hdr.count);
*highlogp = be16_to_cpu(leaf->hdr.count) - 1;
*lowstalep = lowstale;
*highstalep = highstale;
}
struct xfs_dir2_leaf_map_info {
xfs_extlen_t map_blocks; /* number of fsbs in map */
xfs_dablk_t map_off; /* last mapped file offset */
int map_size; /* total entries in *map */
int map_valid; /* valid entries in *map */
int nmap; /* mappings to ask xfs_bmapi */
xfs_dir2_db_t curdb; /* db for current block */
int ra_current; /* number of read-ahead blks */
int ra_index; /* *map index for read-ahead */
int ra_offset; /* map entry offset for ra */
int ra_want; /* readahead count wanted */
struct xfs_bmbt_irec map[]; /* map vector for blocks */
};
STATIC int
xfs_dir2_leaf_readbuf(
struct xfs_inode *dp,
size_t bufsize,
struct xfs_dir2_leaf_map_info *mip,
xfs_dir2_off_t *curoff,
struct xfs_buf **bpp)
{
struct xfs_mount *mp = dp->i_mount;
struct xfs_buf *bp = *bpp;
struct xfs_bmbt_irec *map = mip->map;
int error = 0;
int length;
int i;
int j;
/*
* If we have a buffer, we need to release it and
* take it out of the mapping.
*/
if (bp) {
xfs_trans_brelse(NULL, bp);
bp = NULL;
mip->map_blocks -= mp->m_dirblkfsbs;
/*
* Loop to get rid of the extents for the
* directory block.
*/
for (i = mp->m_dirblkfsbs; i > 0; ) {
j = min_t(int, map->br_blockcount, i);
map->br_blockcount -= j;
map->br_startblock += j;
map->br_startoff += j;
/*
* If mapping is done, pitch it from
* the table.
*/
if (!map->br_blockcount && --mip->map_valid)
memmove(&map[0], &map[1],
sizeof(map[0]) * mip->map_valid);
i -= j;
}
}
/*
* Recalculate the readahead blocks wanted.
*/
mip->ra_want = howmany(bufsize + mp->m_dirblksize,
mp->m_sb.sb_blocksize) - 1;
ASSERT(mip->ra_want >= 0);
/*
* If we don't have as many as we want, and we haven't
* run out of data blocks, get some more mappings.
*/
if (1 + mip->ra_want > mip->map_blocks &&
mip->map_off < xfs_dir2_byte_to_da(mp, XFS_DIR2_LEAF_OFFSET)) {
/*
* Get more bmaps, fill in after the ones
* we already have in the table.
*/
mip->nmap = mip->map_size - mip->map_valid;
error = xfs_bmapi_read(dp, mip->map_off,
xfs_dir2_byte_to_da(mp, XFS_DIR2_LEAF_OFFSET) -
mip->map_off,
&map[mip->map_valid], &mip->nmap, 0);
/*
* Don't know if we should ignore this or try to return an
* error. The trouble with returning errors is that readdir
* will just stop without actually passing the error through.
*/
if (error)
goto out; /* XXX */
/*
* If we got all the mappings we asked for, set the final map
* offset based on the last bmap value received. Otherwise,
* we've reached the end.
*/
if (mip->nmap == mip->map_size - mip->map_valid) {
i = mip->map_valid + mip->nmap - 1;
mip->map_off = map[i].br_startoff + map[i].br_blockcount;
} else
mip->map_off = xfs_dir2_byte_to_da(mp,
XFS_DIR2_LEAF_OFFSET);
/*
* Look for holes in the mapping, and eliminate them. Count up
* the valid blocks.
*/
for (i = mip->map_valid; i < mip->map_valid + mip->nmap; ) {
if (map[i].br_startblock == HOLESTARTBLOCK) {
mip->nmap--;
length = mip->map_valid + mip->nmap - i;
if (length)
memmove(&map[i], &map[i + 1],
sizeof(map[i]) * length);
} else {
mip->map_blocks += map[i].br_blockcount;
i++;
}
}
mip->map_valid += mip->nmap;
}
/*
* No valid mappings, so no more data blocks.
*/
if (!mip->map_valid) {
*curoff = xfs_dir2_da_to_byte(mp, mip->map_off);
goto out;
}
/*
* Read the directory block starting at the first mapping.
*/
mip->curdb = xfs_dir2_da_to_db(mp, map->br_startoff);
error = xfs_dir2_data_read(NULL, dp, map->br_startoff,
map->br_blockcount >= mp->m_dirblkfsbs ?
XFS_FSB_TO_DADDR(mp, map->br_startblock) : -1, &bp);
/*
* Should just skip over the data block instead of giving up.
*/
if (error)
goto out; /* XXX */
/*
* Adjust the current amount of read-ahead: we just read a block that
* was previously ra.
*/
if (mip->ra_current)
mip->ra_current -= mp->m_dirblkfsbs;
/*
* Do we need more readahead?
*/
for (mip->ra_index = mip->ra_offset = i = 0;
mip->ra_want > mip->ra_current && i < mip->map_blocks;
i += mp->m_dirblkfsbs) {
ASSERT(mip->ra_index < mip->map_valid);
/*
* Read-ahead a contiguous directory block.
*/
if (i > mip->ra_current &&
map[mip->ra_index].br_blockcount >= mp->m_dirblkfsbs) {
xfs_dir2_data_readahead(NULL, dp,
map[mip->ra_index].br_startoff + mip->ra_offset,
XFS_FSB_TO_DADDR(mp,
map[mip->ra_index].br_startblock +
mip->ra_offset));
mip->ra_current = i;
}
/*
* Read-ahead a non-contiguous directory block. This doesn't
* use our mapping, but this is a very rare case.
*/
else if (i > mip->ra_current) {
xfs_dir2_data_readahead(NULL, dp,
map[mip->ra_index].br_startoff +
mip->ra_offset, -1);
mip->ra_current = i;
}
/*
* Advance offset through the mapping table.
*/
for (j = 0; j < mp->m_dirblkfsbs; j++) {
/*
* The rest of this extent but not more than a dir
* block.
*/
length = min_t(int, mp->m_dirblkfsbs,
map[mip->ra_index].br_blockcount -
mip->ra_offset);
j += length;
mip->ra_offset += length;
/*
* Advance to the next mapping if this one is used up.
*/
if (mip->ra_offset == map[mip->ra_index].br_blockcount) {
mip->ra_offset = 0;
mip->ra_index++;
}
}
}
out:
*bpp = bp;
return error;
}
/*
* Getdents (readdir) for leaf and node directories.
* This reads the data blocks only, so is the same for both forms.
*/
int /* error */
xfs_dir2_leaf_getdents(
xfs_inode_t *dp, /* incore directory inode */
void *dirent,
size_t bufsize,
xfs_off_t *offset,
filldir_t filldir)
{
struct xfs_buf *bp = NULL; /* data block buffer */
xfs_dir2_data_hdr_t *hdr; /* data block header */
xfs_dir2_data_entry_t *dep; /* data entry */
xfs_dir2_data_unused_t *dup; /* unused entry */
int error = 0; /* error return value */
int length; /* temporary length value */
xfs_mount_t *mp; /* filesystem mount point */
int byteoff; /* offset in current block */
xfs_dir2_off_t curoff; /* current overall offset */
xfs_dir2_off_t newoff; /* new curoff after new blk */
char *ptr = NULL; /* pointer to current data */
struct xfs_dir2_leaf_map_info *map_info;
/*
* If the offset is at or past the largest allowed value,
* give up right away.
*/
if (*offset >= XFS_DIR2_MAX_DATAPTR)
return 0;
mp = dp->i_mount;
/*
* Set up to bmap a number of blocks based on the caller's
* buffer size, the directory block size, and the filesystem
* block size.
*/
length = howmany(bufsize + mp->m_dirblksize,
mp->m_sb.sb_blocksize);
map_info = kmem_zalloc(offsetof(struct xfs_dir2_leaf_map_info, map) +
(length * sizeof(struct xfs_bmbt_irec)),
KM_SLEEP);
map_info->map_size = length;
/*
* Inside the loop we keep the main offset value as a byte offset
* in the directory file.
*/
curoff = xfs_dir2_dataptr_to_byte(mp, *offset);
/*
* Force this conversion through db so we truncate the offset
* down to get the start of the data block.
*/
map_info->map_off = xfs_dir2_db_to_da(mp,
xfs_dir2_byte_to_db(mp, curoff));
/*
* Loop over directory entries until we reach the end offset.
* Get more blocks and readahead as necessary.
*/
while (curoff < XFS_DIR2_LEAF_OFFSET) {
/*
* If we have no buffer, or we're off the end of the
* current buffer, need to get another one.
*/
if (!bp || ptr >= (char *)bp->b_addr + mp->m_dirblksize) {
error = xfs_dir2_leaf_readbuf(dp, bufsize, map_info,
&curoff, &bp);
if (error || !map_info->map_valid)
break;
/*
* Having done a read, we need to set a new offset.
*/
newoff = xfs_dir2_db_off_to_byte(mp, map_info->curdb, 0);
/*
* Start of the current block.
*/
if (curoff < newoff)
curoff = newoff;
/*
* Make sure we're in the right block.
*/
else if (curoff > newoff)
ASSERT(xfs_dir2_byte_to_db(mp, curoff) ==
map_info->curdb);
hdr = bp->b_addr;
xfs_dir2_data_check(dp, bp);
/*
* Find our position in the block.
*/
ptr = (char *)(hdr + 1);
byteoff = xfs_dir2_byte_to_off(mp, curoff);
/*
* Skip past the header.
*/
if (byteoff == 0)
curoff += (uint)sizeof(*hdr);
/*
* Skip past entries until we reach our offset.
*/
else {
while ((char *)ptr - (char *)hdr < byteoff) {
dup = (xfs_dir2_data_unused_t *)ptr;
if (be16_to_cpu(dup->freetag)
== XFS_DIR2_DATA_FREE_TAG) {
length = be16_to_cpu(dup->length);
ptr += length;
continue;
}
dep = (xfs_dir2_data_entry_t *)ptr;
length =
xfs_dir2_data_entsize(dep->namelen);
ptr += length;
}
/*
* Now set our real offset.
*/
curoff =
xfs_dir2_db_off_to_byte(mp,
xfs_dir2_byte_to_db(mp, curoff),
(char *)ptr - (char *)hdr);
if (ptr >= (char *)hdr + mp->m_dirblksize) {
continue;
}
}
}
/*
* We have a pointer to an entry.
* Is it a live one?
*/
dup = (xfs_dir2_data_unused_t *)ptr;
/*
* No, it's unused, skip over it.
*/
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
length = be16_to_cpu(dup->length);
ptr += length;
curoff += length;
continue;
}
dep = (xfs_dir2_data_entry_t *)ptr;
length = xfs_dir2_data_entsize(dep->namelen);
if (filldir(dirent, (char *)dep->name, dep->namelen,
xfs_dir2_byte_to_dataptr(mp, curoff) & 0x7fffffff,
be64_to_cpu(dep->inumber), DT_UNKNOWN))
break;
/*
* Advance to next entry in the block.
*/
ptr += length;
curoff += length;
/* bufsize may have just been a guess; don't go negative */
bufsize = bufsize > length ? bufsize - length : 0;
}
/*
* All done. Set output offset value to current offset.
*/
if (curoff > xfs_dir2_dataptr_to_byte(mp, XFS_DIR2_MAX_DATAPTR))
*offset = XFS_DIR2_MAX_DATAPTR & 0x7fffffff;
else
*offset = xfs_dir2_byte_to_dataptr(mp, curoff) & 0x7fffffff;
kmem_free(map_info);
if (bp)
xfs_trans_brelse(NULL, bp);
return error;
}
/*
* Initialize a new leaf block, leaf1 or leafn magic accepted.
*/
int
xfs_dir2_leaf_init(
xfs_da_args_t *args, /* operation arguments */
xfs_dir2_db_t bno, /* directory block number */
struct xfs_buf **bpp, /* out: leaf buffer */
int magic) /* magic number for block */
{
struct xfs_buf *bp; /* leaf buffer */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
xfs_mount_t *mp; /* filesystem mount point */
xfs_trans_t *tp; /* transaction pointer */
dp = args->dp;
ASSERT(dp != NULL);
tp = args->trans;
mp = dp->i_mount;
ASSERT(bno >= XFS_DIR2_LEAF_FIRSTDB(mp) &&
bno < XFS_DIR2_FREE_FIRSTDB(mp));
/*
* Get the buffer for the block.
*/
error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, bno), -1, &bp,
XFS_DATA_FORK);
if (error)
return error;
/*
* Initialize the header.
*/
leaf = bp->b_addr;
leaf->hdr.info.magic = cpu_to_be16(magic);
leaf->hdr.info.forw = 0;
leaf->hdr.info.back = 0;
leaf->hdr.count = 0;
leaf->hdr.stale = 0;
xfs_dir2_leaf_log_header(tp, bp);
/*
* If it's a leaf-format directory initialize the tail.
* In this case our caller has the real bests table to copy into
* the block.
*/
if (magic == XFS_DIR2_LEAF1_MAGIC) {
bp->b_ops = &xfs_dir2_leaf1_buf_ops;
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
ltp->bestcount = 0;
xfs_dir2_leaf_log_tail(tp, bp);
} else
bp->b_ops = &xfs_dir2_leafn_buf_ops;
*bpp = bp;
return 0;
}
/*
* Log the bests entries indicated from a leaf1 block.
*/
static void
xfs_dir2_leaf_log_bests(
xfs_trans_t *tp, /* transaction pointer */
struct xfs_buf *bp, /* leaf buffer */
int first, /* first entry to log */
int last) /* last entry to log */
{
__be16 *firstb; /* pointer to first entry */
__be16 *lastb; /* pointer to last entry */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
leaf = bp->b_addr;
ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC));
ltp = xfs_dir2_leaf_tail_p(tp->t_mountp, leaf);
firstb = xfs_dir2_leaf_bests_p(ltp) + first;
lastb = xfs_dir2_leaf_bests_p(ltp) + last;
xfs_trans_log_buf(tp, bp, (uint)((char *)firstb - (char *)leaf),
(uint)((char *)lastb - (char *)leaf + sizeof(*lastb) - 1));
}
/*
* Log the leaf entries indicated from a leaf1 or leafn block.
*/
void
xfs_dir2_leaf_log_ents(
xfs_trans_t *tp, /* transaction pointer */
struct xfs_buf *bp, /* leaf buffer */
int first, /* first entry to log */
int last) /* last entry to log */
{
xfs_dir2_leaf_entry_t *firstlep; /* pointer to first entry */
xfs_dir2_leaf_entry_t *lastlep; /* pointer to last entry */
xfs_dir2_leaf_t *leaf; /* leaf structure */
leaf = bp->b_addr;
ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC));
firstlep = &leaf->ents[first];
lastlep = &leaf->ents[last];
xfs_trans_log_buf(tp, bp, (uint)((char *)firstlep - (char *)leaf),
(uint)((char *)lastlep - (char *)leaf + sizeof(*lastlep) - 1));
}
/*
* Log the header of the leaf1 or leafn block.
*/
void
xfs_dir2_leaf_log_header(
struct xfs_trans *tp,
struct xfs_buf *bp)
{
xfs_dir2_leaf_t *leaf; /* leaf structure */
leaf = bp->b_addr;
ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC) ||
leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC));
xfs_trans_log_buf(tp, bp, (uint)((char *)&leaf->hdr - (char *)leaf),
(uint)(sizeof(leaf->hdr) - 1));
}
/*
* Log the tail of the leaf1 block.
*/
STATIC void
xfs_dir2_leaf_log_tail(
struct xfs_trans *tp,
struct xfs_buf *bp)
{
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
xfs_mount_t *mp; /* filesystem mount point */
mp = tp->t_mountp;
leaf = bp->b_addr;
ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC));
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
xfs_trans_log_buf(tp, bp, (uint)((char *)ltp - (char *)leaf),
(uint)(mp->m_dirblksize - 1));
}
/*
* Look up the entry referred to by args in the leaf format directory.
* Most of the work is done by the xfs_dir2_leaf_lookup_int routine which
* is also used by the node-format code.
*/
int
xfs_dir2_leaf_lookup(
xfs_da_args_t *args) /* operation arguments */
{
struct xfs_buf *dbp; /* data block buffer */
xfs_dir2_data_entry_t *dep; /* data block entry */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
int index; /* found entry index */
struct xfs_buf *lbp; /* leaf buffer */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
xfs_trans_t *tp; /* transaction pointer */
trace_xfs_dir2_leaf_lookup(args);
/*
* Look up name in the leaf block, returning both buffers and index.
*/
if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
return error;
}
tp = args->trans;
dp = args->dp;
xfs_dir2_leaf_check(dp, lbp);
leaf = lbp->b_addr;
/*
* Get to the leaf entry and contained data entry address.
*/
lep = &leaf->ents[index];
/*
* Point to the data entry.
*/
dep = (xfs_dir2_data_entry_t *)
((char *)dbp->b_addr +
xfs_dir2_dataptr_to_off(dp->i_mount, be32_to_cpu(lep->address)));
/*
* Return the found inode number & CI name if appropriate
*/
args->inumber = be64_to_cpu(dep->inumber);
error = xfs_dir_cilookup_result(args, dep->name, dep->namelen);
xfs_trans_brelse(tp, dbp);
xfs_trans_brelse(tp, lbp);
return XFS_ERROR(error);
}
/*
* Look up name/hash in the leaf block.
* Fill in indexp with the found index, and dbpp with the data buffer.
* If not found dbpp will be NULL, and ENOENT comes back.
* lbpp will always be filled in with the leaf buffer unless there's an error.
*/
static int /* error */
xfs_dir2_leaf_lookup_int(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf **lbpp, /* out: leaf buffer */
int *indexp, /* out: index in leaf block */
struct xfs_buf **dbpp) /* out: data buffer */
{
xfs_dir2_db_t curdb = -1; /* current data block number */
struct xfs_buf *dbp = NULL; /* data buffer */
xfs_dir2_data_entry_t *dep; /* data entry */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
int index; /* index in leaf block */
struct xfs_buf *lbp; /* leaf buffer */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_mount_t *mp; /* filesystem mount point */
xfs_dir2_db_t newdb; /* new data block number */
xfs_trans_t *tp; /* transaction pointer */
xfs_dir2_db_t cidb = -1; /* case match data block no. */
enum xfs_dacmp cmp; /* name compare result */
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
error = xfs_dir2_leaf_read(tp, dp, mp->m_dirleafblk, -1, &lbp);
if (error)
return error;
*lbpp = lbp;
leaf = lbp->b_addr;
xfs_dir2_leaf_check(dp, lbp);
/*
* Look for the first leaf entry with our hash value.
*/
index = xfs_dir2_leaf_search_hash(args, lbp);
/*
* Loop over all the entries with the right hash value
* looking to match the name.
*/
for (lep = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) &&
be32_to_cpu(lep->hashval) == args->hashval;
lep++, index++) {
/*
* Skip over stale leaf entries.
*/
if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
continue;
/*
* Get the new data block number.
*/
newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
/*
* If it's not the same as the old data block number,
* need to pitch the old one and read the new one.
*/
if (newdb != curdb) {
if (dbp)
xfs_trans_brelse(tp, dbp);
error = xfs_dir2_data_read(tp, dp,
xfs_dir2_db_to_da(mp, newdb),
-1, &dbp);
if (error) {
xfs_trans_brelse(tp, lbp);
return error;
}
curdb = newdb;
}
/*
* Point to the data entry.
*/
dep = (xfs_dir2_data_entry_t *)((char *)dbp->b_addr +
xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)));
/*
* Compare name and if it's an exact match, return the index
* and buffer. If it's the first case-insensitive match, store
* the index and buffer and continue looking for an exact match.
*/
cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
args->cmpresult = cmp;
*indexp = index;
/* case exact match: return the current buffer. */
if (cmp == XFS_CMP_EXACT) {
*dbpp = dbp;
return 0;
}
cidb = curdb;
}
}
ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
/*
* Here, we can only be doing a lookup (not a rename or remove).
* If a case-insensitive match was found earlier, re-read the
* appropriate data block if required and return it.
*/
if (args->cmpresult == XFS_CMP_CASE) {
ASSERT(cidb != -1);
if (cidb != curdb) {
xfs_trans_brelse(tp, dbp);
error = xfs_dir2_data_read(tp, dp,
xfs_dir2_db_to_da(mp, cidb),
-1, &dbp);
if (error) {
xfs_trans_brelse(tp, lbp);
return error;
}
}
*dbpp = dbp;
return 0;
}
/*
* No match found, return ENOENT.
*/
ASSERT(cidb == -1);
if (dbp)
xfs_trans_brelse(tp, dbp);
xfs_trans_brelse(tp, lbp);
return XFS_ERROR(ENOENT);
}
/*
* Remove an entry from a leaf format directory.
*/
int /* error */
xfs_dir2_leaf_removename(
xfs_da_args_t *args) /* operation arguments */
{
__be16 *bestsp; /* leaf block best freespace */
xfs_dir2_data_hdr_t *hdr; /* data block header */
xfs_dir2_db_t db; /* data block number */
struct xfs_buf *dbp; /* data block buffer */
xfs_dir2_data_entry_t *dep; /* data entry structure */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
xfs_dir2_db_t i; /* temporary data block # */
int index; /* index into leaf entries */
struct xfs_buf *lbp; /* leaf buffer */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
xfs_mount_t *mp; /* filesystem mount point */
int needlog; /* need to log data header */
int needscan; /* need to rescan data frees */
xfs_dir2_data_off_t oldbest; /* old value of best free */
xfs_trans_t *tp; /* transaction pointer */
trace_xfs_dir2_leaf_removename(args);
/*
* Lookup the leaf entry, get the leaf and data blocks read in.
*/
if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
return error;
}
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
leaf = lbp->b_addr;
hdr = dbp->b_addr;
xfs_dir2_data_check(dp, dbp);
/*
* Point to the leaf entry, use that to point to the data entry.
*/
lep = &leaf->ents[index];
db = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
dep = (xfs_dir2_data_entry_t *)
((char *)hdr + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)));
needscan = needlog = 0;
oldbest = be16_to_cpu(hdr->bestfree[0].length);
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
bestsp = xfs_dir2_leaf_bests_p(ltp);
ASSERT(be16_to_cpu(bestsp[db]) == oldbest);
/*
* Mark the former data entry unused.
*/
xfs_dir2_data_make_free(tp, dbp,
(xfs_dir2_data_aoff_t)((char *)dep - (char *)hdr),
xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan);
/*
* We just mark the leaf entry stale by putting a null in it.
*/
be16_add_cpu(&leaf->hdr.stale, 1);
xfs_dir2_leaf_log_header(tp, lbp);
lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
xfs_dir2_leaf_log_ents(tp, lbp, index, index);
/*
* Scan the freespace in the data block again if necessary,
* log the data block header if necessary.
*/
if (needscan)
xfs_dir2_data_freescan(mp, hdr, &needlog);
if (needlog)
xfs_dir2_data_log_header(tp, dbp);
/*
* If the longest freespace in the data block has changed,
* put the new value in the bests table and log that.
*/
if (be16_to_cpu(hdr->bestfree[0].length) != oldbest) {
bestsp[db] = hdr->bestfree[0].length;
xfs_dir2_leaf_log_bests(tp, lbp, db, db);
}
xfs_dir2_data_check(dp, dbp);
/*
* If the data block is now empty then get rid of the data block.
*/
if (be16_to_cpu(hdr->bestfree[0].length) ==
mp->m_dirblksize - (uint)sizeof(*hdr)) {
ASSERT(db != mp->m_dirdatablk);
if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
/*
* Nope, can't get rid of it because it caused
* allocation of a bmap btree block to do so.
* Just go on, returning success, leaving the
* empty block in place.
*/
if (error == ENOSPC && args->total == 0)
error = 0;
xfs_dir2_leaf_check(dp, lbp);
return error;
}
dbp = NULL;
/*
* If this is the last data block then compact the
* bests table by getting rid of entries.
*/
if (db == be32_to_cpu(ltp->bestcount) - 1) {
/*
* Look for the last active entry (i).
*/
for (i = db - 1; i > 0; i--) {
if (bestsp[i] != cpu_to_be16(NULLDATAOFF))
break;
}
/*
* Copy the table down so inactive entries at the
* end are removed.
*/
memmove(&bestsp[db - i], bestsp,
(be32_to_cpu(ltp->bestcount) - (db - i)) * sizeof(*bestsp));
be32_add_cpu(&ltp->bestcount, -(db - i));
xfs_dir2_leaf_log_tail(tp, lbp);
xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
} else
bestsp[db] = cpu_to_be16(NULLDATAOFF);
}
/*
* If the data block was not the first one, drop it.
*/
else if (db != mp->m_dirdatablk)
dbp = NULL;
xfs_dir2_leaf_check(dp, lbp);
/*
* See if we can convert to block form.
*/
return xfs_dir2_leaf_to_block(args, lbp, dbp);
}
/*
* Replace the inode number in a leaf format directory entry.
*/
int /* error */
xfs_dir2_leaf_replace(
xfs_da_args_t *args) /* operation arguments */
{
struct xfs_buf *dbp; /* data block buffer */
xfs_dir2_data_entry_t *dep; /* data block entry */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
int index; /* index of leaf entry */
struct xfs_buf *lbp; /* leaf buffer */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
xfs_trans_t *tp; /* transaction pointer */
trace_xfs_dir2_leaf_replace(args);
/*
* Look up the entry.
*/
if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
return error;
}
dp = args->dp;
leaf = lbp->b_addr;
/*
* Point to the leaf entry, get data address from it.
*/
lep = &leaf->ents[index];
/*
* Point to the data entry.
*/
dep = (xfs_dir2_data_entry_t *)
((char *)dbp->b_addr +
xfs_dir2_dataptr_to_off(dp->i_mount, be32_to_cpu(lep->address)));
ASSERT(args->inumber != be64_to_cpu(dep->inumber));
/*
* Put the new inode number in, log it.
*/
dep->inumber = cpu_to_be64(args->inumber);
tp = args->trans;
xfs_dir2_data_log_entry(tp, dbp, dep);
xfs_dir2_leaf_check(dp, lbp);
xfs_trans_brelse(tp, lbp);
return 0;
}
/*
* Return index in the leaf block (lbp) which is either the first
* one with this hash value, or if there are none, the insert point
* for that hash value.
*/
int /* index value */
xfs_dir2_leaf_search_hash(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *lbp) /* leaf buffer */
{
xfs_dahash_t hash=0; /* hash from this entry */
xfs_dahash_t hashwant; /* hash value looking for */
int high; /* high leaf index */
int low; /* low leaf index */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
int mid=0; /* current leaf index */
leaf = lbp->b_addr;
#ifndef __KERNEL__
if (!leaf->hdr.count)
return 0;
#endif
/*
* Note, the table cannot be empty, so we have to go through the loop.
* Binary search the leaf entries looking for our hash value.
*/
for (lep = leaf->ents, low = 0, high = be16_to_cpu(leaf->hdr.count) - 1,
hashwant = args->hashval;
low <= high; ) {
mid = (low + high) >> 1;
if ((hash = be32_to_cpu(lep[mid].hashval)) == hashwant)
break;
if (hash < hashwant)
low = mid + 1;
else
high = mid - 1;
}
/*
* Found one, back up through all the equal hash values.
*/
if (hash == hashwant) {
while (mid > 0 && be32_to_cpu(lep[mid - 1].hashval) == hashwant) {
mid--;
}
}
/*
* Need to point to an entry higher than ours.
*/
else if (hash < hashwant)
mid++;
return mid;
}
/*
* Trim off a trailing data block. We know it's empty since the leaf
* freespace table says so.
*/
int /* error */
xfs_dir2_leaf_trim_data(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *lbp, /* leaf buffer */
xfs_dir2_db_t db) /* data block number */
{
__be16 *bestsp; /* leaf bests table */
struct xfs_buf *dbp; /* data block buffer */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return value */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
xfs_mount_t *mp; /* filesystem mount point */
xfs_trans_t *tp; /* transaction pointer */
dp = args->dp;
mp = dp->i_mount;
tp = args->trans;
/*
* Read the offending data block. We need its buffer.
*/
error = xfs_dir2_data_read(tp, dp, xfs_dir2_db_to_da(mp, db), -1, &dbp);
if (error)
return error;
leaf = lbp->b_addr;
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
#ifdef DEBUG
{
struct xfs_dir2_data_hdr *hdr = dbp->b_addr;
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC));
ASSERT(be16_to_cpu(hdr->bestfree[0].length) ==
mp->m_dirblksize - (uint)sizeof(*hdr));
ASSERT(db == be32_to_cpu(ltp->bestcount) - 1);
}
#endif
/*
* Get rid of the data block.
*/
if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
ASSERT(error != ENOSPC);
xfs_trans_brelse(tp, dbp);
return error;
}
/*
* Eliminate the last bests entry from the table.
*/
bestsp = xfs_dir2_leaf_bests_p(ltp);
be32_add_cpu(&ltp->bestcount, -1);
memmove(&bestsp[1], &bestsp[0], be32_to_cpu(ltp->bestcount) * sizeof(*bestsp));
xfs_dir2_leaf_log_tail(tp, lbp);
xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
return 0;
}
static inline size_t
xfs_dir2_leaf_size(
struct xfs_dir2_leaf_hdr *hdr,
int counts)
{
int entries;
entries = be16_to_cpu(hdr->count) - be16_to_cpu(hdr->stale);
return sizeof(xfs_dir2_leaf_hdr_t) +
entries * sizeof(xfs_dir2_leaf_entry_t) +
counts * sizeof(xfs_dir2_data_off_t) +
sizeof(xfs_dir2_leaf_tail_t);
}
/*
* Convert node form directory to leaf form directory.
* The root of the node form dir needs to already be a LEAFN block.
* Just return if we can't do anything.
*/
int /* error */
xfs_dir2_node_to_leaf(
xfs_da_state_t *state) /* directory operation state */
{
xfs_da_args_t *args; /* operation arguments */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
struct xfs_buf *fbp; /* buffer for freespace block */
xfs_fileoff_t fo; /* freespace file offset */
xfs_dir2_free_t *free; /* freespace structure */
struct xfs_buf *lbp; /* buffer for leaf block */
xfs_dir2_leaf_tail_t *ltp; /* tail of leaf structure */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_mount_t *mp; /* filesystem mount point */
int rval; /* successful free trim? */
xfs_trans_t *tp; /* transaction pointer */
/*
* There's more than a leaf level in the btree, so there must
* be multiple leafn blocks. Give up.
*/
if (state->path.active > 1)
return 0;
args = state->args;
trace_xfs_dir2_node_to_leaf(args);
mp = state->mp;
dp = args->dp;
tp = args->trans;
/*
* Get the last offset in the file.
*/
if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) {
return error;
}
fo -= mp->m_dirblkfsbs;
/*
* If there are freespace blocks other than the first one,
* take this opportunity to remove trailing empty freespace blocks
* that may have been left behind during no-space-reservation
* operations.
*/
while (fo > mp->m_dirfreeblk) {
if ((error = xfs_dir2_node_trim_free(args, fo, &rval))) {
return error;
}
if (rval)
fo -= mp->m_dirblkfsbs;
else
return 0;
}
/*
* Now find the block just before the freespace block.
*/
if ((error = xfs_bmap_last_before(tp, dp, &fo, XFS_DATA_FORK))) {
return error;
}
/*
* If it's not the single leaf block, give up.
*/
if (XFS_FSB_TO_B(mp, fo) > XFS_DIR2_LEAF_OFFSET + mp->m_dirblksize)
return 0;
lbp = state->path.blk[0].bp;
leaf = lbp->b_addr;
ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC));
/*
* Read the freespace block.
*/
error = xfs_dir2_free_read(tp, dp, mp->m_dirfreeblk, &fbp);
if (error)
return error;
free = fbp->b_addr;
ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC));
ASSERT(!free->hdr.firstdb);
/*
* Now see if the leafn and free data will fit in a leaf1.
* If not, release the buffer and give up.
*/
if (xfs_dir2_leaf_size(&leaf->hdr, be32_to_cpu(free->hdr.nvalid)) >
mp->m_dirblksize) {
xfs_trans_brelse(tp, fbp);
return 0;
}
/*
* If the leaf has any stale entries in it, compress them out.
* The compact routine will log the header.
*/
if (be16_to_cpu(leaf->hdr.stale))
xfs_dir2_leaf_compact(args, lbp);
else
xfs_dir2_leaf_log_header(tp, lbp);
lbp->b_ops = &xfs_dir2_leaf1_buf_ops;
leaf->hdr.info.magic = cpu_to_be16(XFS_DIR2_LEAF1_MAGIC);
/*
* Set up the leaf tail from the freespace block.
*/
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
ltp->bestcount = free->hdr.nvalid;
/*
* Set up the leaf bests table.
*/
memcpy(xfs_dir2_leaf_bests_p(ltp), free->bests,
be32_to_cpu(ltp->bestcount) * sizeof(xfs_dir2_data_off_t));
xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
xfs_dir2_leaf_log_tail(tp, lbp);
xfs_dir2_leaf_check(dp, lbp);
/*
* Get rid of the freespace block.
*/
error = xfs_dir2_shrink_inode(args, XFS_DIR2_FREE_FIRSTDB(mp), fbp);
if (error) {
/*
* This can't fail here because it can only happen when
* punching out the middle of an extent, and this is an
* isolated block.
*/
ASSERT(error != ENOSPC);
return error;
}
fbp = NULL;
/*
* Now see if we can convert the single-leaf directory
* down to a block form directory.
* This routine always kills the dabuf for the leaf, so
* eliminate it from the path.
*/
error = xfs_dir2_leaf_to_block(args, lbp, NULL);
state->path.blk[0].bp = NULL;
return error;
}
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