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xfs_dir2_leaf.c
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/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* Copyright (c) 2013 Red Hat, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_dir2.h"
#include "xfs_dir2_priv.h"
#include "xfs_error.h"
#include "xfs_trace.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_cksum.h"
/*
* Local function declarations.
*/
static int xfs_dir2_leaf_lookup_int(xfs_da_args_t *args, struct xfs_buf **lbpp,
int *indexp, struct xfs_buf **dbpp);
static void xfs_dir3_leaf_log_bests(struct xfs_trans *tp, struct xfs_buf *bp,
int first, int last);
static void xfs_dir3_leaf_log_tail(struct xfs_trans *tp, struct xfs_buf *bp);
/*
* Check the internal consistency of a leaf1 block.
* Pop an assert if something is wrong.
*/
#ifdef DEBUG
#define xfs_dir3_leaf_check(dp, bp) \
do { \
if (!xfs_dir3_leaf1_check((dp), (bp))) \
ASSERT(0); \
} while (0);
STATIC bool
xfs_dir3_leaf1_check(
struct xfs_inode *dp,
struct xfs_buf *bp)
{
struct xfs_dir2_leaf *leaf = bp->b_addr;
struct xfs_dir3_icleaf_hdr leafhdr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
if (leafhdr.magic == XFS_DIR3_LEAF1_MAGIC) {
struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
return false;
} else if (leafhdr.magic != XFS_DIR2_LEAF1_MAGIC)
return false;
return xfs_dir3_leaf_check_int(dp->i_mount, dp, &leafhdr, leaf);
}
#else
#define xfs_dir3_leaf_check(dp, bp)
#endif
bool
xfs_dir3_leaf_check_int(
struct xfs_mount *mp,
struct xfs_inode *dp,
struct xfs_dir3_icleaf_hdr *hdr,
struct xfs_dir2_leaf *leaf)
{
struct xfs_dir2_leaf_entry *ents;
xfs_dir2_leaf_tail_t *ltp;
int stale;
int i;
const struct xfs_dir_ops *ops;
struct xfs_dir3_icleaf_hdr leafhdr;
/*
* we can be passed a null dp here from a verifier, so we need to go the
* hard way to get them.
*/
ops = xfs_dir_get_ops(mp, dp);
if (!hdr) {
ops->leaf_hdr_from_disk(&leafhdr, leaf);
hdr = &leafhdr;
}
ents = ops->leaf_ents_p(leaf);
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
/*
* XXX (dgc): This value is not restrictive enough.
* Should factor in the size of the bests table as well.
* We can deduce a value for that from di_size.
*/
if (hdr->count > ops->leaf_max_ents(mp))
return false;
/* Leaves and bests don't overlap in leaf format. */
if ((hdr->magic == XFS_DIR2_LEAF1_MAGIC ||
hdr->magic == XFS_DIR3_LEAF1_MAGIC) &&
(char *)&ents[hdr->count] > (char *)xfs_dir2_leaf_bests_p(ltp))
return false;
/* Check hash value order, count stale entries. */
for (i = stale = 0; i < hdr->count; i++) {
if (i + 1 < hdr->count) {
if (be32_to_cpu(ents[i].hashval) >
be32_to_cpu(ents[i + 1].hashval))
return false;
}
if (ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
stale++;
}
if (hdr->stale != stale)
return false;
return true;
}
/*
* We verify the magic numbers before decoding the leaf header so that on debug
* kernels we don't get assertion failures in xfs_dir3_leaf_hdr_from_disk() due
* to incorrect magic numbers.
*/
static bool
xfs_dir3_leaf_verify(
struct xfs_buf *bp,
__uint16_t magic)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_dir2_leaf *leaf = bp->b_addr;
ASSERT(magic == XFS_DIR2_LEAF1_MAGIC || magic == XFS_DIR2_LEAFN_MAGIC);
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
__uint16_t magic3;
magic3 = (magic == XFS_DIR2_LEAF1_MAGIC) ? XFS_DIR3_LEAF1_MAGIC
: XFS_DIR3_LEAFN_MAGIC;
if (leaf3->info.hdr.magic != cpu_to_be16(magic3))
return false;
if (!uuid_equal(&leaf3->info.uuid, &mp->m_sb.sb_uuid))
return false;
if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
return false;
} else {
if (leaf->hdr.info.magic != cpu_to_be16(magic))
return false;
}
return xfs_dir3_leaf_check_int(mp, NULL, NULL, leaf);
}
static void
__read_verify(
struct xfs_buf *bp,
__uint16_t magic)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
if ((xfs_sb_version_hascrc(&mp->m_sb) &&
!xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
XFS_DIR3_LEAF_CRC_OFF)) ||
!xfs_dir3_leaf_verify(bp, magic)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
xfs_buf_ioerror(bp, EFSCORRUPTED);
}
}
static void
__write_verify(
struct xfs_buf *bp,
__uint16_t magic)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_buf_log_item *bip = bp->b_fspriv;
struct xfs_dir3_leaf_hdr *hdr3 = bp->b_addr;
if (!xfs_dir3_leaf_verify(bp, magic)) {
XFS_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->info.lsn = cpu_to_be64(bip->bli_item.li_lsn);
xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), XFS_DIR3_LEAF_CRC_OFF);
}
static void
xfs_dir3_leaf1_read_verify(
struct xfs_buf *bp)
{
__read_verify(bp, XFS_DIR2_LEAF1_MAGIC);
}
static void
xfs_dir3_leaf1_write_verify(
struct xfs_buf *bp)
{
__write_verify(bp, XFS_DIR2_LEAF1_MAGIC);
}
static void
xfs_dir3_leafn_read_verify(
struct xfs_buf *bp)
{
__read_verify(bp, XFS_DIR2_LEAFN_MAGIC);
}
static void
xfs_dir3_leafn_write_verify(
struct xfs_buf *bp)
{
__write_verify(bp, XFS_DIR2_LEAFN_MAGIC);
}
const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops = {
.verify_read = xfs_dir3_leaf1_read_verify,
.verify_write = xfs_dir3_leaf1_write_verify,
};
const struct xfs_buf_ops xfs_dir3_leafn_buf_ops = {
.verify_read = xfs_dir3_leafn_read_verify,
.verify_write = xfs_dir3_leafn_write_verify,
};
static int
xfs_dir3_leaf_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
xfs_daddr_t mappedbno,
struct xfs_buf **bpp)
{
int err;
err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
XFS_DATA_FORK, &xfs_dir3_leaf1_buf_ops);
if (!err && tp)
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_LEAF1_BUF);
return err;
}
int
xfs_dir3_leafn_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
xfs_daddr_t mappedbno,
struct xfs_buf **bpp)
{
int err;
err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
XFS_DATA_FORK, &xfs_dir3_leafn_buf_ops);
if (!err && tp)
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_LEAFN_BUF);
return err;
}
/*
* Initialize a new leaf block, leaf1 or leafn magic accepted.
*/
static void
xfs_dir3_leaf_init(
struct xfs_mount *mp,
struct xfs_trans *tp,
struct xfs_buf *bp,
xfs_ino_t owner,
__uint16_t type)
{
struct xfs_dir2_leaf *leaf = bp->b_addr;
ASSERT(type == XFS_DIR2_LEAF1_MAGIC || type == XFS_DIR2_LEAFN_MAGIC);
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
memset(leaf3, 0, sizeof(*leaf3));
leaf3->info.hdr.magic = (type == XFS_DIR2_LEAF1_MAGIC)
? cpu_to_be16(XFS_DIR3_LEAF1_MAGIC)
: cpu_to_be16(XFS_DIR3_LEAFN_MAGIC);
leaf3->info.blkno = cpu_to_be64(bp->b_bn);
leaf3->info.owner = cpu_to_be64(owner);
uuid_copy(&leaf3->info.uuid, &mp->m_sb.sb_uuid);
} else {
memset(leaf, 0, sizeof(*leaf));
leaf->hdr.info.magic = cpu_to_be16(type);
}
/*
* If it's a leaf-format directory initialize the tail.
* Caller is responsible for initialising the bests table.
*/
if (type == XFS_DIR2_LEAF1_MAGIC) {
struct xfs_dir2_leaf_tail *ltp;
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
ltp->bestcount = 0;
bp->b_ops = &xfs_dir3_leaf1_buf_ops;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAF1_BUF);
} else {
bp->b_ops = &xfs_dir3_leafn_buf_ops;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_LEAFN_BUF);
}
}
int
xfs_dir3_leaf_get_buf(
xfs_da_args_t *args,
xfs_dir2_db_t bno,
struct xfs_buf **bpp,
__uint16_t magic)
{
struct xfs_inode *dp = args->dp;
struct xfs_trans *tp = args->trans;
struct xfs_mount *mp = dp->i_mount;
struct xfs_buf *bp;
int error;
ASSERT(magic == XFS_DIR2_LEAF1_MAGIC || magic == XFS_DIR2_LEAFN_MAGIC);
ASSERT(bno >= XFS_DIR2_LEAF_FIRSTDB(mp) &&
bno < XFS_DIR2_FREE_FIRSTDB(mp));
error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, bno), -1, &bp,
XFS_DATA_FORK);
if (error)
return error;
xfs_dir3_leaf_init(mp, tp, bp, dp->i_ino, magic);
xfs_dir3_leaf_log_header(tp, dp, bp);
if (magic == XFS_DIR2_LEAF1_MAGIC)
xfs_dir3_leaf_log_tail(tp, bp);
*bpp = bp;
return 0;
}
/*
* Convert a block form directory to a leaf form directory.
*/
int /* error */
xfs_dir2_block_to_leaf(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *dbp) /* input block's buffer */
{
__be16 *bestsp; /* leaf's bestsp entries */
xfs_dablk_t blkno; /* leaf block's bno */
xfs_dir2_data_hdr_t *hdr; /* block header */
xfs_dir2_leaf_entry_t *blp; /* block's leaf entries */
xfs_dir2_block_tail_t *btp; /* block's tail */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
struct xfs_buf *lbp; /* leaf block's buffer */
xfs_dir2_db_t ldb; /* leaf block's bno */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_tail_t *ltp; /* leaf's tail */
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 */
struct xfs_dir2_data_free *bf;
struct xfs_dir2_leaf_entry *ents;
struct xfs_dir3_icleaf_hdr leafhdr;
trace_xfs_dir2_block_to_leaf(args);
dp = args->dp;
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.
*/
error = xfs_dir3_leaf_get_buf(args, ldb, &lbp, XFS_DIR2_LEAF1_MAGIC);
if (error)
return error;
leaf = lbp->b_addr;
hdr = dbp->b_addr;
xfs_dir3_data_check(dp, dbp);
btp = xfs_dir2_block_tail_p(mp, hdr);
blp = xfs_dir2_block_leaf_p(btp);
bf = dp->d_ops->data_bestfree_p(hdr);
ents = dp->d_ops->leaf_ents_p(leaf);
/*
* Set the counts in the leaf header.
*/
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
leafhdr.count = be32_to_cpu(btp->count);
leafhdr.stale = be32_to_cpu(btp->stale);
dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
xfs_dir3_leaf_log_header(tp, dp, lbp);
/*
* Could compact these but I think we always do the conversion
* after squeezing out stale entries.
*/
memcpy(ents, blp, be32_to_cpu(btp->count) * sizeof(xfs_dir2_leaf_entry_t));
xfs_dir3_leaf_log_ents(tp, dp, lbp, 0, leafhdr.count - 1);
needscan = 0;
needlog = 1;
/*
* Make the space formerly occupied by the leaf entries and block
* tail be free.
*/
xfs_dir2_data_make_free(tp, dp, 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_dir3_data_buf_ops;
xfs_trans_buf_set_type(tp, dbp, XFS_BLFT_DIR_DATA_BUF);
if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC))
hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
else
hdr->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC);
if (needscan)
xfs_dir2_data_freescan(dp, hdr, &needlog);
/*
* Set up leaf tail and bests table.
*/
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
ltp->bestcount = cpu_to_be32(1);
bestsp = xfs_dir2_leaf_bests_p(ltp);
bestsp[0] = bf[0].length;
/*
* Log the data header and leaf bests table.
*/
if (needlog)
xfs_dir2_data_log_header(tp, dp, dbp);
xfs_dir3_leaf_check(dp, lbp);
xfs_dir3_data_check(dp, dbp);
xfs_dir3_leaf_log_bests(tp, lbp, 0, 0);
return 0;
}
STATIC void
xfs_dir3_leaf_find_stale(
struct xfs_dir3_icleaf_hdr *leafhdr,
struct xfs_dir2_leaf_entry *ents,
int index,
int *lowstale,
int *highstale)
{
/*
* Find the first stale entry before our index, if any.
*/
for (*lowstale = index - 1; *lowstale >= 0; --*lowstale) {
if (ents[*lowstale].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
break;
}
/*
* Find the first stale entry at or after our index, if any.
* Stop if the result would require moving more entries than using
* lowstale.
*/
for (*highstale = index; *highstale < leafhdr->count; ++*highstale) {
if (ents[*highstale].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
break;
if (*lowstale >= 0 && index - *lowstale <= *highstale - index)
break;
}
}
struct xfs_dir2_leaf_entry *
xfs_dir3_leaf_find_entry(
struct xfs_dir3_icleaf_hdr *leafhdr,
struct xfs_dir2_leaf_entry *ents,
int index, /* leaf table position */
int compact, /* need to compact leaves */
int lowstale, /* index of prev stale leaf */
int highstale, /* index of next stale leaf */
int *lfloglow, /* low leaf logging index */
int *lfloghigh) /* high leaf logging index */
{
if (!leafhdr->stale) {
xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */
/*
* Now we need to make room to insert the leaf entry.
*
* If there are no stale entries, just insert a hole at index.
*/
lep = &ents[index];
if (index < leafhdr->count)
memmove(lep + 1, lep,
(leafhdr->count - index) * sizeof(*lep));
/*
* Record low and high logging indices for the leaf.
*/
*lfloglow = index;
*lfloghigh = leafhdr->count++;
return lep;
}
/*
* There are stale entries.
*
* We will use one of them for the new entry. It's probably not at
* the right location, so we'll have to shift some up or down first.
*
* If we didn't compact before, we need to find the nearest stale
* entries before and after our insertion point.
*/
if (compact == 0)
xfs_dir3_leaf_find_stale(leafhdr, ents, index,
&lowstale, &highstale);
/*
* If the low one is better, use it.
*/
if (lowstale >= 0 &&
(highstale == leafhdr->count ||
index - lowstale - 1 < highstale - index)) {
ASSERT(index - lowstale - 1 >= 0);
ASSERT(ents[lowstale].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR));
/*
* Copy entries up to cover the stale entry and make room
* for the new entry.
*/
if (index - lowstale - 1 > 0) {
memmove(&ents[lowstale], &ents[lowstale + 1],
(index - lowstale - 1) *
sizeof(xfs_dir2_leaf_entry_t));
}
*lfloglow = MIN(lowstale, *lfloglow);
*lfloghigh = MAX(index - 1, *lfloghigh);
leafhdr->stale--;
return &ents[index - 1];
}
/*
* The high one is better, so use that one.
*/
ASSERT(highstale - index >= 0);
ASSERT(ents[highstale].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR));
/*
* Copy entries down to cover the stale entry and make room for the
* new entry.
*/
if (highstale - index > 0) {
memmove(&ents[index + 1], &ents[index],
(highstale - index) * sizeof(xfs_dir2_leaf_entry_t));
}
*lfloglow = MIN(index, *lfloglow);
*lfloghigh = MAX(highstale, *lfloghigh);
leafhdr->stale--;
return &ents[index];
}
/*
* Add an entry to a leaf form directory.
*/
int /* error */
xfs_dir2_leaf_addname(
xfs_da_args_t *args) /* operation arguments */
{
__be16 *bestsp; /* freespace table in leaf */
int compact; /* need to compact leaves */
xfs_dir2_data_hdr_t *hdr; /* data block header */
struct xfs_buf *dbp; /* data block buffer */
xfs_dir2_data_entry_t *dep; /* data block entry */
xfs_inode_t *dp; /* incore directory inode */
xfs_dir2_data_unused_t *dup; /* data unused entry */
int error; /* error return value */
int grown; /* allocated new data block */
int highstale; /* index of next stale leaf */
int i; /* temporary, index */
int index; /* leaf table position */
struct xfs_buf *lbp; /* leaf's buffer */
xfs_dir2_leaf_t *leaf; /* leaf structure */
int length; /* length of new entry */
xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */
int lfloglow; /* low leaf logging index */
int lfloghigh; /* high leaf logging index */
int lowstale; /* index of prev stale leaf */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */
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 */
struct xfs_dir2_data_free *bf; /* bestfree table */
struct xfs_dir2_leaf_entry *ents;
struct xfs_dir3_icleaf_hdr leafhdr;
trace_xfs_dir2_leaf_addname(args);
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
error = xfs_dir3_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);
ents = dp->d_ops->leaf_ents_p(leaf);
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
bestsp = xfs_dir2_leaf_bests_p(ltp);
length = dp->d_ops->data_entsize(args->namelen);
/*
* See if there are any entries with the same hash value
* and space in their block for the new entry.
* This is good because it puts multiple same-hash value entries
* in a data block, improving the lookup of those entries.
*/
for (use_block = -1, lep = &ents[index];
index < leafhdr.count && be32_to_cpu(lep->hashval) == args->hashval;
index++, lep++) {
if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
continue;
i = xfs_dir2_dataptr_to_db(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 (!leafhdr.stale)
needbytes += sizeof(xfs_dir2_leaf_entry_t);
if (use_block == -1)
needbytes += sizeof(xfs_dir2_data_off_t);
/*
* Now kill use_block if it refers to a missing block, so we
* can use it as an indication of allocation needed.
*/
if (use_block != -1 && bestsp[use_block] == cpu_to_be16(NULLDATAOFF))
use_block = -1;
/*
* If we don't have enough free bytes but we can make enough
* by compacting out stale entries, we'll do that.
*/
if ((char *)bestsp - (char *)&ents[leafhdr.count] < needbytes &&
leafhdr.stale > 1)
compact = 1;
/*
* Otherwise if we don't have enough free bytes we need to
* convert to node form.
*/
else if ((char *)bestsp - (char *)&ents[leafhdr.count] < needbytes) {
/*
* Just checking or no space reservation, give up.
*/
if ((args->op_flags & XFS_DA_OP_JUSTCHECK) ||
args->total == 0) {
xfs_trans_brelse(tp, lbp);
return 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_dir3_leaf_compact_x1(&leafhdr, ents, &index, &lowstale,
&highstale, &lfloglow, &lfloghigh);
}
/*
* There are stale entries, so we'll need log-low and log-high
* impossibly bad values later.
*/
else if (leafhdr.stale) {
lfloglow = leafhdr.count;
lfloghigh = -1;
}
/*
* If there was no data block space found, we need to allocate
* a new one.
*/
if (use_block == -1) {
/*
* Add the new data block.
*/
if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE,
&use_block))) {
xfs_trans_brelse(tp, lbp);
return error;
}
/*
* Initialize the block.
*/
if ((error = xfs_dir3_data_init(args, use_block, &dbp))) {
xfs_trans_brelse(tp, lbp);
return error;
}
/*
* If we're adding a new data block on the end we need to
* extend the bests table. Copy it up one entry.
*/
if (use_block >= be32_to_cpu(ltp->bestcount)) {
bestsp--;
memmove(&bestsp[0], &bestsp[1],
be32_to_cpu(ltp->bestcount) * sizeof(bestsp[0]));
be32_add_cpu(<p->bestcount, 1);
xfs_dir3_leaf_log_tail(tp, lbp);
xfs_dir3_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_dir3_leaf_log_bests(tp, lbp, use_block, use_block);
hdr = dbp->b_addr;
bf = dp->d_ops->data_bestfree_p(hdr);
bestsp[use_block] = bf[0].length;
grown = 1;
} else {
/*
* Already had space in some data block.
* Just read that one in.
*/
error = xfs_dir3_data_read(tp, dp,
xfs_dir2_db_to_da(mp, use_block),
-1, &dbp);
if (error) {
xfs_trans_brelse(tp, lbp);
return error;
}
hdr = dbp->b_addr;
bf = dp->d_ops->data_bestfree_p(hdr);
grown = 0;
}
/*
* Point to the biggest freespace in our data block.
*/
dup = (xfs_dir2_data_unused_t *)
((char *)hdr + be16_to_cpu(bf[0].offset));
ASSERT(be16_to_cpu(dup->length) >= length);
needscan = needlog = 0;
/*
* Mark the initial part of our freespace in use for the new entry.
*/
xfs_dir2_data_use_free(tp, dp, dbp, dup,
(xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length,
&needlog, &needscan);
/*
* Initialize our new entry (at last).
*/
dep = (xfs_dir2_data_entry_t *)dup;
dep->inumber = cpu_to_be64(args->inumber);
dep->namelen = args->namelen;
memcpy(dep->name, args->name, dep->namelen);
dp->d_ops->data_put_ftype(dep, args->filetype);
tagp = dp->d_ops->data_entry_tag_p(dep);
*tagp = cpu_to_be16((char *)dep - (char *)hdr);
/*
* Need to scan fix up the bestfree table.
*/
if (needscan)
xfs_dir2_data_freescan(dp, hdr, &needlog);
/*
* Need to log the data block's header.
*/
if (needlog)
xfs_dir2_data_log_header(tp, dp, dbp);
xfs_dir2_data_log_entry(tp, dp, dbp, dep);
/*
* If the bests table needs to be changed, do it.
* Log the change unless we've already done that.
*/
if (be16_to_cpu(bestsp[use_block]) != be16_to_cpu(bf[0].length)) {
bestsp[use_block] = bf[0].length;
if (!grown)
xfs_dir3_leaf_log_bests(tp, lbp, use_block, use_block);
}
lep = xfs_dir3_leaf_find_entry(&leafhdr, ents, index, compact, lowstale,
highstale, &lfloglow, &lfloghigh);
/*
* Fill in the new leaf entry.
*/
lep->hashval = cpu_to_be32(args->hashval);
lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(mp, use_block,
be16_to_cpu(*tagp)));
/*
* Log the leaf fields and give up the buffers.
*/
dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
xfs_dir3_leaf_log_header(tp, dp, lbp);
xfs_dir3_leaf_log_ents(tp, dp, lbp, lfloglow, lfloghigh);
xfs_dir3_leaf_check(dp, lbp);
xfs_dir3_data_check(dp, dbp);
return 0;
}
/*
* Compact out any stale entries in the leaf.
* Log the header and changed leaf entries, if any.
*/
void
xfs_dir3_leaf_compact(
xfs_da_args_t *args, /* operation arguments */
struct xfs_dir3_icleaf_hdr *leafhdr,
struct xfs_buf *bp) /* leaf buffer */
{
int from; /* source leaf index */
xfs_dir2_leaf_t *leaf; /* leaf structure */
int loglow; /* first leaf entry to log */
int to; /* target leaf index */
struct xfs_dir2_leaf_entry *ents;
struct xfs_inode *dp = args->dp;
leaf = bp->b_addr;
if (!leafhdr->stale)
return;
/*
* Compress out the stale entries in place.
*/
ents = dp->d_ops->leaf_ents_p(leaf);
for (from = to = 0, loglow = -1; from < leafhdr->count; from++) {
if (ents[from].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
continue;
/*
* Only actually copy the entries that are different.
*/
if (from > to) {
if (loglow == -1)
loglow = to;
ents[to] = ents[from];
}
to++;
}
/*
* Update and log the header, log the leaf entries.
*/
ASSERT(leafhdr->stale == from - to);
leafhdr->count -= leafhdr->stale;
leafhdr->stale = 0;
dp->d_ops->leaf_hdr_to_disk(leaf, leafhdr);
xfs_dir3_leaf_log_header(args->trans, dp, bp);
if (loglow != -1)
xfs_dir3_leaf_log_ents(args->trans, dp, bp, loglow, to - 1);
}
/*
* Compact the leaf entries, removing stale ones.
* Leave one stale entry behind - the one closest to our
* insertion index - and the caller will shift that one to our insertion
* point later.
* Return new insertion index, where the remaining stale entry is,
* and leaf logging indices.
*/
void
xfs_dir3_leaf_compact_x1(
struct xfs_dir3_icleaf_hdr *leafhdr,
struct xfs_dir2_leaf_entry *ents,
int *indexp, /* insertion index */
int *lowstalep, /* out: stale entry before us */
int *highstalep, /* out: stale entry after us */
int *lowlogp, /* out: low log index */
int *highlogp) /* out: high log index */
{
int from; /* source copy index */
int highstale; /* stale entry at/after index */
int index; /* insertion index */
int keepstale; /* source index of kept stale */
int lowstale; /* stale entry before index */
int newindex=0; /* new insertion index */
int to; /* destination copy index */
ASSERT(leafhdr->stale > 1);
index = *indexp;
xfs_dir3_leaf_find_stale(leafhdr, ents, index, &lowstale, &highstale);
/*
* Pick the better of lowstale and highstale.
*/
if (lowstale >= 0 &&
(highstale == leafhdr->count ||
index - lowstale <= highstale - index))
keepstale = lowstale;
else
keepstale = highstale;
/*
* Copy the entries in place, removing all the stale entries
* except keepstale.
*/
for (from = to = 0; from < leafhdr->count; from++) {
/*