linux_dsm_epyc7002/fs/xfs/libxfs/xfs_dir2_node.c
Dave Chinner 756c6f0f7e xfs: reverse search directory freespace indexes
When a directory is growing rapidly, new blocks tend to get added at
the end of the directory. These end up at the end of the freespace
index, and when the directory gets large finding these new
freespaces gets expensive. The code does a linear search across the
frespace index from the first block in the directory to the last,
hence meaning the newly added space is the last index searched.

Instead, do a reverse order index search, starting from the last
block and index in the freespace index. This makes most lookups for
free space on rapidly growing directories O(1) instead of O(N), but
should not have any impact on random insert workloads because the
average search length is the same regardless of which end of the
array we start at.

The result is a major improvement in large directory grow rates:

		create time(sec) / rate (files/s)
 File count     vanilla             Prev commit		Patched
  10k	      0.41 / 24.3k	   0.42 / 23.8k       0.41 / 24.3k
  20k	      0.74 / 27.0k	   0.76 / 26.3k       0.75 / 26.7k
 100k	      3.81 / 26.4k	   3.47 / 28.8k       3.27 / 30.6k
 200k	      8.58 / 23.3k	   7.19 / 27.8k       6.71 / 29.8k
   1M	     85.69 / 11.7k	  48.53 / 20.6k      37.67 / 26.5k
   2M	    280.31 /  7.1k	 130.14 / 15.3k      79.55 / 25.2k
  10M	   3913.26 /  2.5k                          552.89 / 18.1k

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-08-30 22:43:57 -07:00

2303 lines
62 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* Copyright (c) 2013 Red Hat, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.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_log.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);
/*
* Check internal consistency of a leafn block.
*/
#ifdef DEBUG
static xfs_failaddr_t
xfs_dir3_leafn_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_LEAFN_MAGIC) {
struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
return __this_address;
} else if (leafhdr.magic != XFS_DIR2_LEAFN_MAGIC)
return __this_address;
return xfs_dir3_leaf_check_int(dp->i_mount, dp, &leafhdr, leaf);
}
static inline void
xfs_dir3_leaf_check(
struct xfs_inode *dp,
struct xfs_buf *bp)
{
xfs_failaddr_t fa;
fa = xfs_dir3_leafn_check(dp, bp);
if (!fa)
return;
xfs_corruption_error(__func__, XFS_ERRLEVEL_LOW, dp->i_mount,
bp->b_addr, BBTOB(bp->b_length), __FILE__, __LINE__,
fa);
ASSERT(0);
}
#else
#define xfs_dir3_leaf_check(dp, bp)
#endif
static xfs_failaddr_t
xfs_dir3_free_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_mount;
struct xfs_dir2_free_hdr *hdr = bp->b_addr;
if (!xfs_verify_magic(bp, hdr->magic))
return __this_address;
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
return __this_address;
if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
return __this_address;
if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn)))
return __this_address;
}
/* XXX: should bounds check the xfs_dir3_icfree_hdr here */
return NULL;
}
static void
xfs_dir3_free_read_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_mount;
xfs_failaddr_t fa;
if (xfs_sb_version_hascrc(&mp->m_sb) &&
!xfs_buf_verify_cksum(bp, XFS_DIR3_FREE_CRC_OFF))
xfs_verifier_error(bp, -EFSBADCRC, __this_address);
else {
fa = xfs_dir3_free_verify(bp);
if (fa)
xfs_verifier_error(bp, -EFSCORRUPTED, fa);
}
}
static void
xfs_dir3_free_write_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_mount;
struct xfs_buf_log_item *bip = bp->b_log_item;
struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
xfs_failaddr_t fa;
fa = xfs_dir3_free_verify(bp);
if (fa) {
xfs_verifier_error(bp, -EFSCORRUPTED, fa);
return;
}
if (!xfs_sb_version_hascrc(&mp->m_sb))
return;
if (bip)
hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn);
xfs_buf_update_cksum(bp, XFS_DIR3_FREE_CRC_OFF);
}
const struct xfs_buf_ops xfs_dir3_free_buf_ops = {
.name = "xfs_dir3_free",
.magic = { cpu_to_be32(XFS_DIR2_FREE_MAGIC),
cpu_to_be32(XFS_DIR3_FREE_MAGIC) },
.verify_read = xfs_dir3_free_read_verify,
.verify_write = xfs_dir3_free_write_verify,
.verify_struct = xfs_dir3_free_verify,
};
/* Everything ok in the free block header? */
static xfs_failaddr_t
xfs_dir3_free_header_check(
struct xfs_inode *dp,
xfs_dablk_t fbno,
struct xfs_buf *bp)
{
struct xfs_mount *mp = dp->i_mount;
unsigned int firstdb;
int maxbests;
maxbests = dp->d_ops->free_max_bests(mp->m_dir_geo);
firstdb = (xfs_dir2_da_to_db(mp->m_dir_geo, fbno) -
xfs_dir2_byte_to_db(mp->m_dir_geo, XFS_DIR2_FREE_OFFSET)) *
maxbests;
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_free_hdr *hdr3 = bp->b_addr;
if (be32_to_cpu(hdr3->firstdb) != firstdb)
return __this_address;
if (be32_to_cpu(hdr3->nvalid) > maxbests)
return __this_address;
if (be32_to_cpu(hdr3->nvalid) < be32_to_cpu(hdr3->nused))
return __this_address;
} else {
struct xfs_dir2_free_hdr *hdr = bp->b_addr;
if (be32_to_cpu(hdr->firstdb) != firstdb)
return __this_address;
if (be32_to_cpu(hdr->nvalid) > maxbests)
return __this_address;
if (be32_to_cpu(hdr->nvalid) < be32_to_cpu(hdr->nused))
return __this_address;
}
return NULL;
}
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)
{
xfs_failaddr_t fa;
int err;
err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
XFS_DATA_FORK, &xfs_dir3_free_buf_ops);
if (err || !*bpp)
return err;
/* Check things that we can't do in the verifier. */
fa = xfs_dir3_free_header_check(dp, fbno, *bpp);
if (fa) {
xfs_verifier_error(*bpp, -EFSCORRUPTED, fa);
xfs_trans_brelse(tp, *bpp);
return -EFSCORRUPTED;
}
/* try read returns without an error or *bpp if it lands in a hole */
if (tp)
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_FREE_BUF);
return 0;
}
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);
}
static int
xfs_dir3_free_get_buf(
xfs_da_args_t *args,
xfs_dir2_db_t fbno,
struct xfs_buf **bpp)
{
struct xfs_trans *tp = args->trans;
struct xfs_inode *dp = args->dp;
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(args->geo, 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_meta_uuid);
} else
hdr.magic = XFS_DIR2_FREE_MAGIC;
dp->d_ops->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_da_args *args,
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 = args->dp->d_ops->free_bests_p(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(args->trans, 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_da_args *args,
struct xfs_buf *bp)
{
#ifdef DEBUG
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));
#endif
xfs_trans_log_buf(args->trans, bp, 0,
args->dp->d_ops->free_hdr_size - 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 */
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;
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_byte_to_db(args->geo, XFS_DIR2_FREE_OFFSET));
/*
* Get the buffer for the new freespace block.
*/
error = xfs_dir3_free_get_buf(args, fdb, &fbp);
if (error)
return error;
free = fbp->b_addr;
dp->d_ops->free_hdr_from_disk(&freehdr, free);
leaf = lbp->b_addr;
ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
if (be32_to_cpu(ltp->bestcount) >
(uint)dp->i_d.di_size / args->geo->blksize)
return -EFSCORRUPTED;
/*
* Copy freespace entries from the leaf block to the new block.
* Count active entries.
*/
from = xfs_dir2_leaf_bests_p(ltp);
to = dp->d_ops->free_bests_p(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);
dp->d_ops->free_hdr_to_disk(fbp->b_addr, &freehdr);
xfs_dir2_free_log_bests(args, fbp, 0, freehdr.nvalid - 1);
xfs_dir2_free_log_header(args, 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(args, lbp);
xfs_dir3_leaf_check(dp, lbp);
return 0;
}
/*
* Add a leaf entry to a leaf block in a node-form directory.
* The other work necessary is done from the caller.
*/
static int /* error */
xfs_dir2_leafn_add(
struct xfs_buf *bp, /* leaf buffer */
struct xfs_da_args *args, /* operation arguments */
int index) /* insertion pt for new entry */
{
struct xfs_dir3_icleaf_hdr leafhdr;
struct xfs_inode *dp = args->dp;
struct xfs_dir2_leaf *leaf = bp->b_addr;
struct xfs_dir2_leaf_entry *lep;
struct xfs_dir2_leaf_entry *ents;
int compact; /* compacting stale leaves */
int highstale = 0; /* next stale entry */
int lfloghigh; /* high leaf entry logging */
int lfloglow; /* low leaf entry logging */
int lowstale = 0; /* previous stale entry */
trace_xfs_dir2_leafn_add(args, index);
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
/*
* Quick check just to make sure we are not going to index
* into other peoples memory
*/
if (index < 0)
return -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 == dp->d_ops->leaf_max_ents(args->geo)) {
if (!leafhdr.stale)
return -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(args->geo,
args->blkno, args->index));
dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
xfs_dir3_leaf_log_header(args, bp);
xfs_dir3_leaf_log_ents(args, bp, lfloglow, lfloghigh);
xfs_dir3_leaf_check(dp, bp);
return 0;
}
#ifdef DEBUG
static void
xfs_dir2_free_hdr_check(
struct xfs_inode *dp,
struct xfs_buf *bp,
xfs_dir2_db_t db)
{
struct xfs_dir3_icfree_hdr hdr;
dp->d_ops->free_hdr_from_disk(&hdr, bp->b_addr);
ASSERT((hdr.firstdb %
dp->d_ops->free_max_bests(dp->i_mount->m_dir_geo)) == 0);
ASSERT(hdr.firstdb <= db);
ASSERT(db < hdr.firstdb + hdr.nvalid);
}
#else
#define xfs_dir2_free_hdr_check(dp, bp, db)
#endif /* DEBUG */
/*
* Return the last hash value in the leaf.
* Stale entries are ok.
*/
xfs_dahash_t /* hash value */
xfs_dir2_leaf_lasthash(
struct xfs_inode *dp,
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;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ASSERT(leafhdr.magic == XFS_DIR2_LEAFN_MAGIC ||
leafhdr.magic == XFS_DIR3_LEAFN_MAGIC ||
leafhdr.magic == XFS_DIR2_LEAF1_MAGIC ||
leafhdr.magic == XFS_DIR3_LEAF1_MAGIC);
if (count)
*count = leafhdr.count;
if (!leafhdr.count)
return 0;
ents = dp->d_ops->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;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
xfs_dir3_leaf_check(dp, 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 = dp->d_ops->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(args->geo,
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 = dp->d_ops->db_to_fdb(args->geo, 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(args->geo,
newfdb),
&curbp);
if (error)
return error;
free = curbp->b_addr;
xfs_dir2_free_hdr_check(dp, curbp, curdb);
}
/*
* Get the index for our entry.
*/
fi = dp->d_ops->db_to_fdindex(args->geo, curdb);
/*
* If it has room, return it.
*/
bests = dp->d_ops->free_bests_p(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 -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 -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;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
xfs_dir3_leaf_check(dp, bp);
if (leafhdr.count <= 0)
return -EFSCORRUPTED;
/*
* 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(args->geo,
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(args->geo,
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(args->geo,
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);
args->filetype = dp->d_ops->data_get_ftype(dep);
*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 -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 -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 */
{
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(args, 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(args, 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(args, 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_inode *dp,
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;
dp->d_ops->leaf_hdr_from_disk(&hdr1, leaf1);
dp->d_ops->leaf_hdr_from_disk(&hdr2, leaf2);
ents1 = dp->d_ops->leaf_ents_p(leaf1);
ents2 = dp->d_ops->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 */
int swap_blocks; /* swapped leaf blocks */
struct xfs_dir2_leaf_entry *ents1;
struct xfs_dir2_leaf_entry *ents2;
struct xfs_dir3_icleaf_hdr hdr1;
struct xfs_dir3_icleaf_hdr hdr2;
struct xfs_inode *dp = state->args->dp;
args = state->args;
/*
* If the block order is wrong, swap the arguments.
*/
swap_blocks = xfs_dir2_leafn_order(dp, blk1->bp, blk2->bp);
if (swap_blocks)
swap(blk1, blk2);
leaf1 = blk1->bp->b_addr;
leaf2 = blk2->bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&hdr1, leaf1);
dp->d_ops->leaf_hdr_from_disk(&hdr2, leaf2);
ents1 = dp->d_ops->leaf_ents_p(leaf1);
ents2 = dp->d_ops->leaf_ents_p(leaf2);
oldsum = hdr1.count + hdr2.count;
#if defined(DEBUG) || defined(XFS_WARN)
oldstale = hdr1.stale + hdr2.stale;
#endif
mid = oldsum >> 1;
/*
* If the old leaf count was odd then the new one will be even,
* so we need to divide the new count evenly.
*/
if (oldsum & 1) {
xfs_dahash_t midhash; /* middle entry hash value */
if (mid >= hdr1.count)
midhash = be32_to_cpu(ents2[mid - hdr1.count].hashval);
else
midhash = be32_to_cpu(ents1[mid].hashval);
isleft = args->hashval <= midhash;
}
/*
* If the old count is even then the new count is odd, so there's
* no preferred side for the new entry.
* Pick the left one.
*/
else
isleft = 1;
/*
* Calculate moved entry count. Positive means left-to-right,
* negative means right-to-left. Then move the entries.
*/
count = hdr1.count - mid + (isleft == 0);
if (count > 0)
xfs_dir3_leafn_moveents(args, blk1->bp, &hdr1, ents1,
hdr1.count - count, blk2->bp,
&hdr2, ents2, 0, count);
else if (count < 0)
xfs_dir3_leafn_moveents(args, blk2->bp, &hdr2, ents2, 0,
blk1->bp, &hdr1, ents1,
hdr1.count, count);
ASSERT(hdr1.count + hdr2.count == oldsum);
ASSERT(hdr1.stale + hdr2.stale == oldstale);
/* log the changes made when moving the entries */
dp->d_ops->leaf_hdr_to_disk(leaf1, &hdr1);
dp->d_ops->leaf_hdr_to_disk(leaf2, &hdr2);
xfs_dir3_leaf_log_header(args, blk1->bp);
xfs_dir3_leaf_log_header(args, blk2->bp);
xfs_dir3_leaf_check(dp, blk1->bp);
xfs_dir3_leaf_check(dp, blk2->bp);
/*
* Mark whether we're inserting into the old or new leaf.
*/
if (hdr1.count < hdr2.count)
state->inleaf = swap_blocks;
else if (hdr1.count > hdr2.count)
state->inleaf = !swap_blocks;
else
state->inleaf = swap_blocks ^ (blk1->index <= hdr1.count);
/*
* Adjust the expected index for insertion.
*/
if (!state->inleaf)
blk2->index = blk1->index - hdr1.count;
/*
* Finally sanity check just to make sure we are not returning a
* negative index
*/
if (blk2->index < 0) {
state->inleaf = 1;
blk2->index = 0;
xfs_alert(dp->i_mount,
"%s: picked the wrong leaf? reverting original leaf: blk1->index %d",
__func__, blk1->index);
}
}
static int
xfs_dir3_data_block_free(
xfs_da_args_t *args,
struct xfs_dir2_data_hdr *hdr,
struct xfs_dir2_free *free,
xfs_dir2_db_t fdb,
int findex,
struct xfs_buf *fbp,
int longest)
{
int logfree = 0;
__be16 *bests;
struct xfs_dir3_icfree_hdr freehdr;
struct xfs_inode *dp = args->dp;
dp->d_ops->free_hdr_from_disk(&freehdr, free);
bests = dp->d_ops->free_bests_p(free);
if (hdr) {
/*
* Data block is not empty, just set the free entry to the new
* value.
*/
bests[findex] = cpu_to_be16(longest);
xfs_dir2_free_log_bests(args, fbp, findex, findex);
return 0;
}
/* One less used entry in the free table. */
freehdr.nused--;
/*
* If this was the last entry in the table, we can trim the table size
* back. There might be other entries at the end referring to
* non-existent data blocks, get those too.
*/
if (findex == freehdr.nvalid - 1) {
int i; /* free entry index */
for (i = findex - 1; i >= 0; i--) {
if (bests[i] != cpu_to_be16(NULLDATAOFF))
break;
}
freehdr.nvalid = i + 1;
logfree = 0;
} else {
/* Not the last entry, just punch it out. */
bests[findex] = cpu_to_be16(NULLDATAOFF);
logfree = 1;
}
dp->d_ops->free_hdr_to_disk(free, &freehdr);
xfs_dir2_free_log_header(args, fbp);
/*
* If there are no useful entries left in the block, get rid of the
* block if we can.
*/
if (!freehdr.nused) {
int error;
error = xfs_dir2_shrink_inode(args, fdb, fbp);
if (error == 0) {
fbp = NULL;
logfree = 0;
} else if (error != -ENOSPC || args->total != 0)
return error;
/*
* It's possible to get ENOSPC if there is no
* space reservation. In this case some one
* else will eventually get rid of this block.
*/
}
/* Log the free entry that changed, unless we got rid of it. */
if (logfree)
xfs_dir2_free_log_bests(args, fbp, findex, findex);
return 0;
}
/*
* Remove an entry from a node directory.
* This removes the leaf entry and the data entry,
* and updates the free block if necessary.
*/
static int /* error */
xfs_dir2_leafn_remove(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *bp, /* leaf buffer */
int index, /* leaf entry index */
xfs_da_state_blk_t *dblk, /* data block */
int *rval) /* resulting block needs join */
{
xfs_dir2_data_hdr_t *hdr; /* data block header */
xfs_dir2_db_t db; /* data block number */
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_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
int longest; /* longest data free entry */
int off; /* data block entry offset */
int needlog; /* need to log data header */
int needscan; /* need to rescan data frees */
xfs_trans_t *tp; /* transaction pointer */
struct xfs_dir2_data_free *bf; /* bestfree table */
struct xfs_dir3_icleaf_hdr leafhdr;
struct xfs_dir2_leaf_entry *ents;
trace_xfs_dir2_leafn_remove(args, index);
dp = args->dp;
tp = args->trans;
leaf = bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
/*
* Point to the entry we're removing.
*/
lep = &ents[index];
/*
* Extract the data block and offset from the entry.
*/
db = xfs_dir2_dataptr_to_db(args->geo, be32_to_cpu(lep->address));
ASSERT(dblk->blkno == db);
off = xfs_dir2_dataptr_to_off(args->geo, be32_to_cpu(lep->address));
ASSERT(dblk->index == off);
/*
* Kill the leaf entry by marking it stale.
* Log the leaf block changes.
*/
leafhdr.stale++;
dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
xfs_dir3_leaf_log_header(args, bp);
lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
xfs_dir3_leaf_log_ents(args, bp, index, index);
/*
* Make the data entry free. Keep track of the longest freespace
* in the data block in case it changes.
*/
dbp = dblk->bp;
hdr = dbp->b_addr;
dep = (xfs_dir2_data_entry_t *)((char *)hdr + off);
bf = dp->d_ops->data_bestfree_p(hdr);
longest = be16_to_cpu(bf[0].length);
needlog = needscan = 0;
xfs_dir2_data_make_free(args, dbp, off,
dp->d_ops->data_entsize(dep->namelen), &needlog, &needscan);
/*
* Rescan the data block freespaces for bestfree.
* Log the data block header if needed.
*/
if (needscan)
xfs_dir2_data_freescan(dp, hdr, &needlog);
if (needlog)
xfs_dir2_data_log_header(args, dbp);
xfs_dir3_data_check(dp, dbp);
/*
* If the longest data block freespace changes, need to update
* the corresponding freeblock entry.
*/
if (longest < be16_to_cpu(bf[0].length)) {
int error; /* error return value */
struct xfs_buf *fbp; /* freeblock buffer */
xfs_dir2_db_t fdb; /* freeblock block number */
int findex; /* index in freeblock entries */
xfs_dir2_free_t *free; /* freeblock structure */
/*
* Convert the data block number to a free block,
* read in the free block.
*/
fdb = dp->d_ops->db_to_fdb(args->geo, db);
error = xfs_dir2_free_read(tp, dp,
xfs_dir2_db_to_da(args->geo, fdb),
&fbp);
if (error)
return error;
free = fbp->b_addr;
#ifdef DEBUG
{
struct xfs_dir3_icfree_hdr freehdr;
dp->d_ops->free_hdr_from_disk(&freehdr, free);
ASSERT(freehdr.firstdb == dp->d_ops->free_max_bests(args->geo) *
(fdb - xfs_dir2_byte_to_db(args->geo,
XFS_DIR2_FREE_OFFSET)));
}
#endif
/*
* Calculate which entry we need to fix.
*/
findex = dp->d_ops->db_to_fdindex(args->geo, db);
longest = be16_to_cpu(bf[0].length);
/*
* If the data block is now empty we can get rid of it
* (usually).
*/
if (longest == args->geo->blksize -
dp->d_ops->data_entry_offset) {
/*
* Try to punch out the data block.
*/
error = xfs_dir2_shrink_inode(args, db, dbp);
if (error == 0) {
dblk->bp = NULL;
hdr = NULL;
}
/*
* We can get ENOSPC if there's no space reservation.
* In this case just drop the buffer and some one else
* will eventually get rid of the empty block.
*/
else if (!(error == -ENOSPC && args->total == 0))
return error;
}
/*
* If we got rid of the data block, we can eliminate that entry
* in the free block.
*/
error = xfs_dir3_data_block_free(args, hdr, free,
fdb, findex, fbp, longest);
if (error)
return error;
}
xfs_dir3_leaf_check(dp, bp);
/*
* Return indication of whether this leaf block is empty enough
* to justify trying to join it with a neighbor.
*/
*rval = (dp->d_ops->leaf_hdr_size +
(uint)sizeof(ents[0]) * (leafhdr.count - leafhdr.stale)) <
args->geo->magicpct;
return 0;
}
/*
* Split the leaf entries in the old block into old and new blocks.
*/
int /* error */
xfs_dir2_leafn_split(
xfs_da_state_t *state, /* btree cursor */
xfs_da_state_blk_t *oldblk, /* original block */
xfs_da_state_blk_t *newblk) /* newly created block */
{
xfs_da_args_t *args; /* operation arguments */
xfs_dablk_t blkno; /* new leaf block number */
int error; /* error return value */
struct xfs_inode *dp;
/*
* Allocate space for a new leaf node.
*/
args = state->args;
dp = args->dp;
ASSERT(oldblk->magic == XFS_DIR2_LEAFN_MAGIC);
error = xfs_da_grow_inode(args, &blkno);
if (error) {
return error;
}
/*
* Initialize the new leaf block.
*/
error = xfs_dir3_leaf_get_buf(args, xfs_dir2_da_to_db(args->geo, blkno),
&newblk->bp, XFS_DIR2_LEAFN_MAGIC);
if (error)
return error;
newblk->blkno = blkno;
newblk->magic = XFS_DIR2_LEAFN_MAGIC;
/*
* Rebalance the entries across the two leaves, link the new
* block into the leaves.
*/
xfs_dir2_leafn_rebalance(state, oldblk, newblk);
error = xfs_da3_blk_link(state, oldblk, newblk);
if (error) {
return error;
}
/*
* Insert the new entry in the correct block.
*/
if (state->inleaf)
error = xfs_dir2_leafn_add(oldblk->bp, args, oldblk->index);
else
error = xfs_dir2_leafn_add(newblk->bp, args, newblk->index);
/*
* Update last hashval in each block since we added the name.
*/
oldblk->hashval = xfs_dir2_leaf_lasthash(dp, oldblk->bp, NULL);
newblk->hashval = xfs_dir2_leaf_lasthash(dp, newblk->bp, NULL);
xfs_dir3_leaf_check(dp, oldblk->bp);
xfs_dir3_leaf_check(dp, newblk->bp);
return error;
}
/*
* Check a leaf block and its neighbors to see if the block should be
* collapsed into one or the other neighbor. Always keep the block
* with the smaller block number.
* If the current block is over 50% full, don't try to join it, return 0.
* If the block is empty, fill in the state structure and return 2.
* If it can be collapsed, fill in the state structure and return 1.
* If nothing can be done, return 0.
*/
int /* error */
xfs_dir2_leafn_toosmall(
xfs_da_state_t *state, /* btree cursor */
int *action) /* resulting action to take */
{
xfs_da_state_blk_t *blk; /* leaf block */
xfs_dablk_t blkno; /* leaf block number */
struct xfs_buf *bp; /* leaf buffer */
int bytes; /* bytes in use */
int count; /* leaf live entry count */
int error; /* error return value */
int forward; /* sibling block direction */
int i; /* sibling counter */
xfs_dir2_leaf_t *leaf; /* leaf structure */
int rval; /* result from path_shift */
struct xfs_dir3_icleaf_hdr leafhdr;
struct xfs_dir2_leaf_entry *ents;
struct xfs_inode *dp = state->args->dp;
/*
* Check for the degenerate case of the block being over 50% full.
* If so, it's not worth even looking to see if we might be able
* to coalesce with a sibling.
*/
blk = &state->path.blk[state->path.active - 1];
leaf = blk->bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
xfs_dir3_leaf_check(dp, blk->bp);
count = leafhdr.count - leafhdr.stale;
bytes = dp->d_ops->leaf_hdr_size + count * sizeof(ents[0]);
if (bytes > (state->args->geo->blksize >> 1)) {
/*
* Blk over 50%, don't try to join.
*/
*action = 0;
return 0;
}
/*
* Check for the degenerate case of the block being empty.
* If the block is empty, we'll simply delete it, no need to
* coalesce it with a sibling block. We choose (arbitrarily)
* to merge with the forward block unless it is NULL.
*/
if (count == 0) {
/*
* Make altpath point to the block we want to keep and
* path point to the block we want to drop (this one).
*/
forward = (leafhdr.forw != 0);
memcpy(&state->altpath, &state->path, sizeof(state->path));
error = xfs_da3_path_shift(state, &state->altpath, forward, 0,
&rval);
if (error)
return error;
*action = rval ? 2 : 0;
return 0;
}
/*
* Examine each sibling block to see if we can coalesce with
* at least 25% free space to spare. We need to figure out
* whether to merge with the forward or the backward block.
* We prefer coalescing with the lower numbered sibling so as
* to shrink a directory over time.
*/
forward = leafhdr.forw < leafhdr.back;
for (i = 0, bp = NULL; i < 2; forward = !forward, i++) {
struct xfs_dir3_icleaf_hdr hdr2;
blkno = forward ? leafhdr.forw : leafhdr.back;
if (blkno == 0)
continue;
/*
* Read the sibling leaf block.
*/
error = xfs_dir3_leafn_read(state->args->trans, dp,
blkno, -1, &bp);
if (error)
return error;
/*
* Count bytes in the two blocks combined.
*/
count = leafhdr.count - leafhdr.stale;
bytes = state->args->geo->blksize -
(state->args->geo->blksize >> 2);
leaf = bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&hdr2, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
count += hdr2.count - hdr2.stale;
bytes -= count * sizeof(ents[0]);
/*
* Fits with at least 25% to spare.
*/
if (bytes >= 0)
break;
xfs_trans_brelse(state->args->trans, bp);
}
/*
* Didn't like either block, give up.
*/
if (i >= 2) {
*action = 0;
return 0;
}
/*
* Make altpath point to the block we want to keep (the lower
* numbered block) and path point to the block we want to drop.
*/
memcpy(&state->altpath, &state->path, sizeof(state->path));
if (blkno < blk->blkno)
error = xfs_da3_path_shift(state, &state->altpath, forward, 0,
&rval);
else
error = xfs_da3_path_shift(state, &state->path, forward, 0,
&rval);
if (error) {
return error;
}
*action = rval ? 0 : 1;
return 0;
}
/*
* Move all the leaf entries from drop_blk to save_blk.
* This is done as part of a join operation.
*/
void
xfs_dir2_leafn_unbalance(
xfs_da_state_t *state, /* cursor */
xfs_da_state_blk_t *drop_blk, /* dead block */
xfs_da_state_blk_t *save_blk) /* surviving block */
{
xfs_da_args_t *args; /* operation arguments */
xfs_dir2_leaf_t *drop_leaf; /* dead leaf structure */
xfs_dir2_leaf_t *save_leaf; /* surviving leaf structure */
struct xfs_dir3_icleaf_hdr savehdr;
struct xfs_dir3_icleaf_hdr drophdr;
struct xfs_dir2_leaf_entry *sents;
struct xfs_dir2_leaf_entry *dents;
struct xfs_inode *dp = state->args->dp;
args = state->args;
ASSERT(drop_blk->magic == XFS_DIR2_LEAFN_MAGIC);
ASSERT(save_blk->magic == XFS_DIR2_LEAFN_MAGIC);
drop_leaf = drop_blk->bp->b_addr;
save_leaf = save_blk->bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&savehdr, save_leaf);
dp->d_ops->leaf_hdr_from_disk(&drophdr, drop_leaf);
sents = dp->d_ops->leaf_ents_p(save_leaf);
dents = dp->d_ops->leaf_ents_p(drop_leaf);
/*
* If there are any stale leaf entries, take this opportunity
* to purge them.
*/
if (drophdr.stale)
xfs_dir3_leaf_compact(args, &drophdr, drop_blk->bp);
if (savehdr.stale)
xfs_dir3_leaf_compact(args, &savehdr, save_blk->bp);
/*
* Move the entries from drop to the appropriate end of save.
*/
drop_blk->hashval = be32_to_cpu(dents[drophdr.count - 1].hashval);
if (xfs_dir2_leafn_order(dp, save_blk->bp, drop_blk->bp))
xfs_dir3_leafn_moveents(args, drop_blk->bp, &drophdr, dents, 0,
save_blk->bp, &savehdr, sents, 0,
drophdr.count);
else
xfs_dir3_leafn_moveents(args, drop_blk->bp, &drophdr, dents, 0,
save_blk->bp, &savehdr, sents,
savehdr.count, drophdr.count);
save_blk->hashval = be32_to_cpu(sents[savehdr.count - 1].hashval);
/* log the changes made when moving the entries */
dp->d_ops->leaf_hdr_to_disk(save_leaf, &savehdr);
dp->d_ops->leaf_hdr_to_disk(drop_leaf, &drophdr);
xfs_dir3_leaf_log_header(args, save_blk->bp);
xfs_dir3_leaf_log_header(args, drop_blk->bp);
xfs_dir3_leaf_check(dp, save_blk->bp);
xfs_dir3_leaf_check(dp, drop_blk->bp);
}
/*
* Add a new data block to the directory at the free space index that the caller
* has specified.
*/
static int
xfs_dir2_node_add_datablk(
struct xfs_da_args *args,
struct xfs_da_state_blk *fblk,
xfs_dir2_db_t *dbno,
struct xfs_buf **dbpp,
struct xfs_buf **fbpp,
int *findex)
{
struct xfs_inode *dp = args->dp;
struct xfs_trans *tp = args->trans;
struct xfs_mount *mp = dp->i_mount;
struct xfs_dir3_icfree_hdr freehdr;
struct xfs_dir2_data_free *bf;
struct xfs_dir2_data_hdr *hdr;
struct xfs_dir2_free *free = NULL;
xfs_dir2_db_t fbno;
struct xfs_buf *fbp;
struct xfs_buf *dbp;
__be16 *bests = NULL;
int error;
/* Not allowed to allocate, return failure. */
if (args->total == 0)
return -ENOSPC;
/* Allocate and initialize the new data block. */
error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, dbno);
if (error)
return error;
error = xfs_dir3_data_init(args, *dbno, &dbp);
if (error)
return error;
/*
* Get the freespace block corresponding to the data block
* that was just allocated.
*/
fbno = dp->d_ops->db_to_fdb(args->geo, *dbno);
error = xfs_dir2_free_try_read(tp, dp,
xfs_dir2_db_to_da(args->geo, fbno), &fbp);
if (error)
return error;
/*
* If there wasn't a freespace block, the read will
* return a NULL fbp. Allocate and initialize a new one.
*/
if (!fbp) {
error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, &fbno);
if (error)
return error;
if (dp->d_ops->db_to_fdb(args->geo, *dbno) != fbno) {
xfs_alert(mp,
"%s: dir ino %llu needed freesp block %lld for data block %lld, got %lld",
__func__, (unsigned long long)dp->i_ino,
(long long)dp->d_ops->db_to_fdb(args->geo, *dbno),
(long long)*dbno, (long long)fbno);
if (fblk) {
xfs_alert(mp,
" fblk "PTR_FMT" blkno %llu index %d magic 0x%x",
fblk, (unsigned long long)fblk->blkno,
fblk->index, fblk->magic);
} else {
xfs_alert(mp, " ... fblk is NULL");
}
XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
/* Get a buffer for the new block. */
error = xfs_dir3_free_get_buf(args, fbno, &fbp);
if (error)
return error;
free = fbp->b_addr;
bests = dp->d_ops->free_bests_p(free);
dp->d_ops->free_hdr_from_disk(&freehdr, free);
/* Remember the first slot as our empty slot. */
freehdr.firstdb = (fbno - xfs_dir2_byte_to_db(args->geo,
XFS_DIR2_FREE_OFFSET)) *
dp->d_ops->free_max_bests(args->geo);
} else {
free = fbp->b_addr;
bests = dp->d_ops->free_bests_p(free);
dp->d_ops->free_hdr_from_disk(&freehdr, free);
}
/* Set the freespace block index from the data block number. */
*findex = dp->d_ops->db_to_fdindex(args->geo, *dbno);
/* Extend the freespace table if the new data block is off the end. */
if (*findex >= freehdr.nvalid) {
ASSERT(*findex < dp->d_ops->free_max_bests(args->geo));
freehdr.nvalid = *findex + 1;
bests[*findex] = cpu_to_be16(NULLDATAOFF);
}
/*
* If this entry was for an empty data block (this should always be
* true) then update the header.
*/
if (bests[*findex] == cpu_to_be16(NULLDATAOFF)) {
freehdr.nused++;
dp->d_ops->free_hdr_to_disk(fbp->b_addr, &freehdr);
xfs_dir2_free_log_header(args, fbp);
}
/* Update the freespace value for the new block in the table. */
hdr = dbp->b_addr;
bf = dp->d_ops->data_bestfree_p(hdr);
bests[*findex] = bf[0].length;
*dbpp = dbp;
*fbpp = fbp;
return 0;
}
static int
xfs_dir2_node_find_freeblk(
struct xfs_da_args *args,
struct xfs_da_state_blk *fblk,
xfs_dir2_db_t *dbnop,
struct xfs_buf **fbpp,
int *findexp,
int length)
{
struct xfs_dir3_icfree_hdr freehdr;
struct xfs_dir2_free *free = NULL;
struct xfs_inode *dp = args->dp;
struct xfs_trans *tp = args->trans;
struct xfs_buf *fbp = NULL;
xfs_dir2_db_t firstfbno;
xfs_dir2_db_t lastfbno;
xfs_dir2_db_t ifbno = -1;
xfs_dir2_db_t dbno = -1;
xfs_dir2_db_t fbno;
xfs_fileoff_t fo;
__be16 *bests = NULL;
int findex = 0;
int error;
/*
* If we came in with a freespace block that means that lookup
* found an entry with our hash value. This is the freespace
* block for that data entry.
*/
if (fblk) {
fbp = fblk->bp;
free = fbp->b_addr;
findex = fblk->index;
if (findex >= 0) {
/* caller already found the freespace for us. */
bests = dp->d_ops->free_bests_p(free);
dp->d_ops->free_hdr_from_disk(&freehdr, free);
ASSERT(findex < freehdr.nvalid);
ASSERT(be16_to_cpu(bests[findex]) != NULLDATAOFF);
ASSERT(be16_to_cpu(bests[findex]) >= length);
dbno = freehdr.firstdb + findex;
goto found_block;
}
/*
* The data block looked at didn't have enough room.
* We'll start at the beginning of the freespace entries.
*/
ifbno = fblk->blkno;
xfs_trans_brelse(tp, fbp);
fbp = NULL;
fblk->bp = NULL;
}
/*
* If we don't have a data block yet, we're going to scan the freespace
* data for a data block with enough free space in it.
*/
error = xfs_bmap_last_offset(dp, &fo, XFS_DATA_FORK);
if (error)
return error;
lastfbno = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)fo);
firstfbno = xfs_dir2_byte_to_db(args->geo, XFS_DIR2_FREE_OFFSET);
for (fbno = lastfbno - 1; fbno >= firstfbno; fbno--) {
/* If it's ifbno we already looked at it. */
if (fbno == ifbno)
continue;
/*
* Read the block. There can be holes in the freespace blocks,
* so this might not succeed. This should be really rare, so
* there's no reason to avoid it.
*/
error = xfs_dir2_free_try_read(tp, dp,
xfs_dir2_db_to_da(args->geo, fbno),
&fbp);
if (error)
return error;
if (!fbp)
continue;
free = fbp->b_addr;
bests = dp->d_ops->free_bests_p(free);
dp->d_ops->free_hdr_from_disk(&freehdr, free);
/* Scan the free entry array for a large enough free space. */
for (findex = freehdr.nvalid - 1; findex >= 0; findex--) {
if (be16_to_cpu(bests[findex]) != NULLDATAOFF &&
be16_to_cpu(bests[findex]) >= length) {
dbno = freehdr.firstdb + findex;
goto found_block;
}
}
/* Didn't find free space, go on to next free block */
xfs_trans_brelse(tp, fbp);
}
found_block:
*dbnop = dbno;
*fbpp = fbp;
*findexp = findex;
return 0;
}
/*
* Add the data entry for a node-format directory name addition.
* The leaf entry is added in xfs_dir2_leafn_add.
* We may enter with a freespace block that the lookup found.
*/
static int
xfs_dir2_node_addname_int(
struct xfs_da_args *args, /* operation arguments */
struct xfs_da_state_blk *fblk) /* optional freespace block */
{
struct xfs_dir2_data_unused *dup; /* data unused entry pointer */
struct xfs_dir2_data_entry *dep; /* data entry pointer */
struct xfs_dir2_data_hdr *hdr; /* data block header */
struct xfs_dir2_data_free *bf;
struct xfs_dir2_free *free = NULL; /* freespace block structure */
struct xfs_trans *tp = args->trans;
struct xfs_inode *dp = args->dp;
struct xfs_buf *dbp; /* data block buffer */
struct xfs_buf *fbp; /* freespace buffer */
xfs_dir2_data_aoff_t aoff;
xfs_dir2_db_t dbno; /* data block number */
int error; /* error return value */
int findex; /* freespace entry index */
int length; /* length of the new entry */
int logfree = 0; /* need to log free entry */
int needlog = 0; /* need to log data header */
int needscan = 0; /* need to rescan data frees */
__be16 *tagp; /* data entry tag pointer */
__be16 *bests;
length = dp->d_ops->data_entsize(args->namelen);
error = xfs_dir2_node_find_freeblk(args, fblk, &dbno, &fbp, &findex,
length);
if (error)
return error;
/*
* Now we know if we must allocate blocks, so if we are checking whether
* we can insert without allocation then we can return now.
*/
if (args->op_flags & XFS_DA_OP_JUSTCHECK) {
if (dbno == -1)
return -ENOSPC;
return 0;
}
/*
* If we don't have a data block, we need to allocate one and make
* the freespace entries refer to it.
*/
if (dbno == -1) {
/* we're going to have to log the free block index later */
logfree = 1;
error = xfs_dir2_node_add_datablk(args, fblk, &dbno, &dbp, &fbp,
&findex);
} else {
/* Read the data block in. */
error = xfs_dir3_data_read(tp, dp,
xfs_dir2_db_to_da(args->geo, dbno),
-1, &dbp);
}
if (error)
return error;
/* setup for data block up now */
hdr = dbp->b_addr;
bf = dp->d_ops->data_bestfree_p(hdr);
ASSERT(be16_to_cpu(bf[0].length) >= length);
/* Point to the existing unused space. */
dup = (xfs_dir2_data_unused_t *)
((char *)hdr + be16_to_cpu(bf[0].offset));
/* Mark the first part of the unused space, inuse for us. */
aoff = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr);
error = xfs_dir2_data_use_free(args, dbp, dup, aoff, length,
&needlog, &needscan);
if (error) {
xfs_trans_brelse(tp, dbp);
return error;
}
/* Fill in the new entry and log it. */
dep = (xfs_dir2_data_entry_t *)dup;
dep->inumber = cpu_to_be64(args->inumber);
dep->namelen = args->namelen;
memcpy(dep->name, args->name, dep->namelen);
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);
xfs_dir2_data_log_entry(args, dbp, dep);
/* Rescan the freespace and log the data block if needed. */
if (needscan)
xfs_dir2_data_freescan(dp, hdr, &needlog);
if (needlog)
xfs_dir2_data_log_header(args, dbp);
/* If the freespace block entry is now wrong, update it. */
free = fbp->b_addr;
bests = dp->d_ops->free_bests_p(free);
if (bests[findex] != bf[0].length) {
bests[findex] = bf[0].length;
logfree = 1;
}
/* Log the freespace entry if needed. */
if (logfree)
xfs_dir2_free_log_bests(args, fbp, findex, findex);
/* Return the data block and offset in args. */
args->blkno = (xfs_dablk_t)dbno;
args->index = be16_to_cpu(*tagp);
return 0;
}
/*
* Top-level node form directory addname routine.
*/
int /* error */
xfs_dir2_node_addname(
xfs_da_args_t *args) /* operation arguments */
{
xfs_da_state_blk_t *blk; /* leaf block for insert */
int error; /* error return value */
int rval; /* sub-return value */
xfs_da_state_t *state; /* btree cursor */
trace_xfs_dir2_node_addname(args);
/*
* Allocate and initialize the state (btree cursor).
*/
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
/*
* Look up the name. We're not supposed to find it, but
* this gives us the insertion point.
*/
error = xfs_da3_node_lookup_int(state, &rval);
if (error)
rval = error;
if (rval != -ENOENT) {
goto done;
}
/*
* Add the data entry to a data block.
* Extravalid is set to a freeblock found by lookup.
*/
rval = xfs_dir2_node_addname_int(args,
state->extravalid ? &state->extrablk : NULL);
if (rval) {
goto done;
}
blk = &state->path.blk[state->path.active - 1];
ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
/*
* Add the new leaf entry.
*/
rval = xfs_dir2_leafn_add(blk->bp, args, blk->index);
if (rval == 0) {
/*
* It worked, fix the hash values up the btree.
*/
if (!(args->op_flags & XFS_DA_OP_JUSTCHECK))
xfs_da3_fixhashpath(state, &state->path);
} else {
/*
* It didn't work, we need to split the leaf block.
*/
if (args->total == 0) {
ASSERT(rval == -ENOSPC);
goto done;
}
/*
* Split the leaf block and insert the new entry.
*/
rval = xfs_da3_split(state);
}
done:
xfs_da_state_free(state);
return rval;
}
/*
* Lookup an entry in a node-format directory.
* All the real work happens in xfs_da3_node_lookup_int.
* The only real output is the inode number of the entry.
*/
int /* error */
xfs_dir2_node_lookup(
xfs_da_args_t *args) /* operation arguments */
{
int error; /* error return value */
int i; /* btree level */
int rval; /* operation return value */
xfs_da_state_t *state; /* btree cursor */
trace_xfs_dir2_node_lookup(args);
/*
* Allocate and initialize the btree cursor.
*/
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
/*
* Fill in the path to the entry in the cursor.
*/
error = xfs_da3_node_lookup_int(state, &rval);
if (error)
rval = error;
else if (rval == -ENOENT && args->cmpresult == XFS_CMP_CASE) {
/* If a CI match, dup the actual name and return -EEXIST */
xfs_dir2_data_entry_t *dep;
dep = (xfs_dir2_data_entry_t *)
((char *)state->extrablk.bp->b_addr +
state->extrablk.index);
rval = xfs_dir_cilookup_result(args, dep->name, dep->namelen);
}
/*
* Release the btree blocks and leaf block.
*/
for (i = 0; i < state->path.active; i++) {
xfs_trans_brelse(args->trans, state->path.blk[i].bp);
state->path.blk[i].bp = NULL;
}
/*
* Release the data block if we have it.
*/
if (state->extravalid && state->extrablk.bp) {
xfs_trans_brelse(args->trans, state->extrablk.bp);
state->extrablk.bp = NULL;
}
xfs_da_state_free(state);
return rval;
}
/*
* Remove an entry from a node-format directory.
*/
int /* error */
xfs_dir2_node_removename(
struct xfs_da_args *args) /* operation arguments */
{
struct xfs_da_state_blk *blk; /* leaf block */
int error; /* error return value */
int rval; /* operation return value */
struct xfs_da_state *state; /* btree cursor */
trace_xfs_dir2_node_removename(args);
/*
* Allocate and initialize the btree cursor.
*/
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
/* Look up the entry we're deleting, set up the cursor. */
error = xfs_da3_node_lookup_int(state, &rval);
if (error)
goto out_free;
/* Didn't find it, upper layer screwed up. */
if (rval != -EEXIST) {
error = rval;
goto out_free;
}
blk = &state->path.blk[state->path.active - 1];
ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
ASSERT(state->extravalid);
/*
* Remove the leaf and data entries.
* Extrablk refers to the data block.
*/
error = xfs_dir2_leafn_remove(args, blk->bp, blk->index,
&state->extrablk, &rval);
if (error)
goto out_free;
/*
* Fix the hash values up the btree.
*/
xfs_da3_fixhashpath(state, &state->path);
/*
* If we need to join leaf blocks, do it.
*/
if (rval && state->path.active > 1)
error = xfs_da3_join(state);
/*
* If no errors so far, try conversion to leaf format.
*/
if (!error)
error = xfs_dir2_node_to_leaf(state);
out_free:
xfs_da_state_free(state);
return error;
}
/*
* Replace an entry's inode number in a node-format directory.
*/
int /* error */
xfs_dir2_node_replace(
xfs_da_args_t *args) /* operation arguments */
{
xfs_da_state_blk_t *blk; /* leaf block */
xfs_dir2_data_hdr_t *hdr; /* data block header */
xfs_dir2_data_entry_t *dep; /* data entry changed */
int error; /* error return value */
int i; /* btree level */
xfs_ino_t inum; /* new inode number */
int ftype; /* new file type */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry being changed */
int rval; /* internal return value */
xfs_da_state_t *state; /* btree cursor */
trace_xfs_dir2_node_replace(args);
/*
* Allocate and initialize the btree cursor.
*/
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
/*
* We have to save new inode number and ftype since
* xfs_da3_node_lookup_int() is going to overwrite them
*/
inum = args->inumber;
ftype = args->filetype;
/*
* Lookup the entry to change in the btree.
*/
error = xfs_da3_node_lookup_int(state, &rval);
if (error) {
rval = error;
}
/*
* It should be found, since the vnodeops layer has looked it up
* and locked it. But paranoia is good.
*/
if (rval == -EEXIST) {
struct xfs_dir2_leaf_entry *ents;
/*
* Find the leaf entry.
*/
blk = &state->path.blk[state->path.active - 1];
ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
leaf = blk->bp->b_addr;
ents = args->dp->d_ops->leaf_ents_p(leaf);
lep = &ents[blk->index];
ASSERT(state->extravalid);
/*
* Point to the data entry.
*/
hdr = state->extrablk.bp->b_addr;
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC));
dep = (xfs_dir2_data_entry_t *)
((char *)hdr +
xfs_dir2_dataptr_to_off(args->geo,
be32_to_cpu(lep->address)));
ASSERT(inum != be64_to_cpu(dep->inumber));
/*
* Fill in the new inode number and log the entry.
*/
dep->inumber = cpu_to_be64(inum);
args->dp->d_ops->data_put_ftype(dep, ftype);
xfs_dir2_data_log_entry(args, state->extrablk.bp, dep);
rval = 0;
}
/*
* Didn't find it, and we're holding a data block. Drop it.
*/
else if (state->extravalid) {
xfs_trans_brelse(args->trans, state->extrablk.bp);
state->extrablk.bp = NULL;
}
/*
* Release all the buffers in the cursor.
*/
for (i = 0; i < state->path.active; i++) {
xfs_trans_brelse(args->trans, state->path.blk[i].bp);
state->path.blk[i].bp = NULL;
}
xfs_da_state_free(state);
return rval;
}
/*
* Trim off a trailing empty freespace block.
* Return (in rvalp) 1 if we did it, 0 if not.
*/
int /* error */
xfs_dir2_node_trim_free(
xfs_da_args_t *args, /* operation arguments */
xfs_fileoff_t fo, /* free block number */
int *rvalp) /* out: did something */
{
struct xfs_buf *bp; /* freespace buffer */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
xfs_dir2_free_t *free; /* freespace structure */
xfs_trans_t *tp; /* transaction pointer */
struct xfs_dir3_icfree_hdr freehdr;
dp = args->dp;
tp = args->trans;
*rvalp = 0;
/*
* Read the freespace block.
*/
error = xfs_dir2_free_try_read(tp, dp, fo, &bp);
if (error)
return error;
/*
* There can be holes in freespace. If fo is a hole, there's
* nothing to do.
*/
if (!bp)
return 0;
free = bp->b_addr;
dp->d_ops->free_hdr_from_disk(&freehdr, free);
/*
* If there are used entries, there's nothing to do.
*/
if (freehdr.nused > 0) {
xfs_trans_brelse(tp, bp);
return 0;
}
/*
* Blow the block away.
*/
error = xfs_dir2_shrink_inode(args,
xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)fo), bp);
if (error) {
/*
* Can't fail with ENOSPC since that only happens with no
* space reservation, when breaking up an extent into two
* pieces. This is the last block of an extent.
*/
ASSERT(error != -ENOSPC);
xfs_trans_brelse(tp, bp);
return error;
}
/*
* Return that we succeeded.
*/
*rvalp = 1;
return 0;
}