[XFS] Split xfs_dir2_leafn_lookup_int into its two pieces of functionality

SGI-PV: 976035
SGI-Modid: xfs-linux-melb:xfs-kern:30834a

Signed-off-by: Barry Naujok <bnaujok@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
This commit is contained in:
Barry Naujok 2008-04-17 16:49:43 +10:00 committed by Niv Sardi
parent c9272c4f9f
commit f9f6dce019

View File

@ -387,28 +387,26 @@ xfs_dir2_leafn_lasthash(
}
/*
* 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.
* 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.
*/
int
xfs_dir2_leafn_lookup_int(
STATIC int
xfs_dir2_leafn_lookup_for_addname(
xfs_dabuf_t *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 */
{
xfs_dabuf_t *curbp; /* current data/free buffer */
xfs_dir2_db_t curdb; /* current data block number */
xfs_dir2_db_t curfdb; /* current free block number */
xfs_dir2_data_entry_t *dep; /* data block entry */
xfs_dabuf_t *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 */
xfs_dir2_free_t *free = NULL; /* free block structure */
int index; /* leaf entry index */
xfs_dir2_leaf_t *leaf; /* leaf structure */
int length=0; /* length of new data entry */
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 */
@ -431,33 +429,20 @@ xfs_dir2_leafn_lookup_int(
/*
* Do we have a buffer coming in?
*/
if (state->extravalid)
if (state->extravalid) {
/* If so, it's a free block buffer, get the block number. */
curbp = state->extrablk.bp;
else
curbp = NULL;
/*
* For addname, it's a free block buffer, get the block number.
*/
if (args->addname) {
curfdb = curbp ? state->extrablk.blkno : -1;
curdb = -1;
length = xfs_dir2_data_entsize(args->namelen);
if ((free = (curbp ? curbp->data : NULL)))
ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC);
}
/*
* For others, it's a data block buffer, get the block number.
*/
else {
curfdb = -1;
curdb = curbp ? state->extrablk.blkno : -1;
curfdb = state->extrablk.blkno;
free = curbp->data;
ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC);
}
length = xfs_dir2_data_entsize(args->namelen);
/*
* Loop over leaf entries with the right hash value.
*/
for (lep = &leaf->ents[index];
index < be16_to_cpu(leaf->hdr.count) && be32_to_cpu(lep->hashval) == args->hashval;
lep++, index++) {
for (lep = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) &&
be32_to_cpu(lep->hashval) == args->hashval;
lep++, index++) {
/*
* Skip stale leaf entries.
*/
@ -471,160 +456,220 @@ xfs_dir2_leafn_lookup_int(
* 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 (args->addname) {
if (newdb != curdb) {
curdb = newdb;
/*
* If this block isn't the data block we already have
* in hand, take a look at it.
* Convert the data block to the free block
* holding its freespace information.
*/
if (newdb != curdb) {
curdb = newdb;
/*
* Convert the data block to the free block
* holding its freespace information.
*/
newfdb = xfs_dir2_db_to_fdb(mp, newdb);
/*
* If it's not the one we have in hand,
* read it in.
*/
if (newfdb != curfdb) {
/*
* If we had one before, drop it.
*/
if (curbp)
xfs_da_brelse(tp, curbp);
/*
* Read the free block.
*/
if ((error = xfs_da_read_buf(tp, dp,
xfs_dir2_db_to_da(mp,
newfdb),
-1, &curbp,
XFS_DATA_FORK))) {
return error;
}
free = curbp->data;
ASSERT(be32_to_cpu(free->hdr.magic) ==
XFS_DIR2_FREE_MAGIC);
ASSERT((be32_to_cpu(free->hdr.firstdb) %
XFS_DIR2_MAX_FREE_BESTS(mp)) ==
0);
ASSERT(be32_to_cpu(free->hdr.firstdb) <= curdb);
ASSERT(curdb <
be32_to_cpu(free->hdr.firstdb) +
be32_to_cpu(free->hdr.nvalid));
}
/*
* Get the index for our entry.
*/
fi = xfs_dir2_db_to_fdindex(mp, curdb);
/*
* If it has room, return it.
*/
if (unlikely(be16_to_cpu(free->bests[fi]) == NULLDATAOFF)) {
XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int",
XFS_ERRLEVEL_LOW, mp);
if (curfdb != newfdb)
xfs_da_brelse(tp, curbp);
return XFS_ERROR(EFSCORRUPTED);
}
curfdb = newfdb;
if (be16_to_cpu(free->bests[fi]) >= length) {
*indexp = index;
state->extravalid = 1;
state->extrablk.bp = curbp;
state->extrablk.blkno = curfdb;
state->extrablk.index = fi;
state->extrablk.magic =
XFS_DIR2_FREE_MAGIC;
ASSERT(args->oknoent);
return XFS_ERROR(ENOENT);
}
}
}
/*
* Not adding a new entry, so we really want to find
* the name given to us.
*/
else {
newfdb = xfs_dir2_db_to_fdb(mp, newdb);
/*
* If it's a different data block, go get it.
* If it's not the one we have in hand, read it in.
*/
if (newdb != curdb) {
if (newfdb != curfdb) {
/*
* If we had a block before, drop it.
* If we had one before, drop it.
*/
if (curbp)
xfs_da_brelse(tp, curbp);
/*
* Read the data block.
* Read the free block.
*/
if ((error =
xfs_da_read_buf(tp, dp,
xfs_dir2_db_to_da(mp, newdb), -1,
&curbp, XFS_DATA_FORK))) {
error = xfs_da_read_buf(tp, dp,
xfs_dir2_db_to_da(mp, newfdb),
-1, &curbp, XFS_DATA_FORK);
if (error)
return error;
}
xfs_dir2_data_check(dp, curbp);
curdb = newdb;
free = curbp->data;
ASSERT(be32_to_cpu(free->hdr.magic) ==
XFS_DIR2_FREE_MAGIC);
ASSERT((be32_to_cpu(free->hdr.firstdb) %
XFS_DIR2_MAX_FREE_BESTS(mp)) == 0);
ASSERT(be32_to_cpu(free->hdr.firstdb) <= curdb);
ASSERT(curdb < be32_to_cpu(free->hdr.firstdb) +
be32_to_cpu(free->hdr.nvalid));
}
/*
* Point to the data entry.
* Get the index for our entry.
*/
dep = (xfs_dir2_data_entry_t *)
((char *)curbp->data +
xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)));
fi = xfs_dir2_db_to_fdindex(mp, curdb);
/*
* Compare the entry, return it if it matches.
* If it has room, return it.
*/
if (dep->namelen == args->namelen &&
dep->name[0] == args->name[0] &&
memcmp(dep->name, args->name, args->namelen) == 0) {
args->inumber = be64_to_cpu(dep->inumber);
*indexp = index;
state->extravalid = 1;
state->extrablk.bp = curbp;
state->extrablk.blkno = curdb;
state->extrablk.index =
(int)((char *)dep -
(char *)curbp->data);
state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
return XFS_ERROR(EEXIST);
if (unlikely(be16_to_cpu(free->bests[fi]) == NULLDATAOFF)) {
XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int",
XFS_ERRLEVEL_LOW, mp);
if (curfdb != newfdb)
xfs_da_brelse(tp, curbp);
return XFS_ERROR(EFSCORRUPTED);
}
curfdb = newfdb;
if (be16_to_cpu(free->bests[fi]) >= length)
goto out;
}
}
/*
* Didn't find a match.
* If we are holding a buffer, give it back in case our caller
* finds it useful.
*/
if ((state->extravalid = (curbp != NULL))) {
/* Didn't find any space */
fi = -1;
out:
ASSERT(args->oknoent);
if (curbp) {
/* Giving back a free block. */
state->extravalid = 1;
state->extrablk.bp = curbp;
state->extrablk.index = -1;
/*
* For addname, giving back a free block.
*/
if (args->addname) {
state->extrablk.blkno = curfdb;
state->extrablk.magic = XFS_DIR2_FREE_MAGIC;
}
/*
* For other callers, giving back a data block.
*/
else {
state->extrablk.blkno = curdb;
state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
}
state->extrablk.index = fi;
state->extrablk.blkno = curfdb;
state->extrablk.magic = XFS_DIR2_FREE_MAGIC;
} else {
state->extravalid = 0;
}
/*
* Return the final index, that will be the insertion point.
* Return the index, that will be the insertion point.
*/
*indexp = index;
ASSERT(index == be16_to_cpu(leaf->hdr.count) || args->oknoent);
return XFS_ERROR(ENOENT);
}
/*
* Look up a leaf entry in a node-format leaf block.
* The extrablk in state a data block.
*/
STATIC int
xfs_dir2_leafn_lookup_for_entry(
xfs_dabuf_t *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 */
{
xfs_dabuf_t *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 di; /* data entry index */
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 */
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
leaf = bp->data;
ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC);
#ifdef __KERNEL__
ASSERT(be16_to_cpu(leaf->hdr.count) > 0);
#endif
xfs_dir2_leafn_check(dp, bp);
/*
* 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 = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) &&
be32_to_cpu(lep->hashval) == args->hashval;
lep++, index++) {
/*
* Skip stale leaf entries.
*/
if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
continue;
/*
* Pull the data block number from the entry.
*/
newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
/*
* Not adding a new entry, so we really want to find
* the name given to us.
*
* If it's a different data block, go get it.
*/
if (newdb != curdb) {
/*
* If we had a block before, drop it.
*/
if (curbp)
xfs_da_brelse(tp, curbp);
/*
* Read the data block.
*/
error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp,
newdb), -1, &curbp, XFS_DATA_FORK);
if (error)
return error;
xfs_dir2_data_check(dp, curbp);
curdb = newdb;
}
/*
* Point to the data entry.
*/
dep = (xfs_dir2_data_entry_t *)((char *)curbp->data +
xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)));
/*
* Compare the entry, return it if it matches.
*/
if (dep->namelen == args->namelen && memcmp(dep->name,
args->name, args->namelen) == 0) {
args->inumber = be64_to_cpu(dep->inumber);
di = (int)((char *)dep - (char *)curbp->data);
error = EEXIST;
goto out;
}
}
/* Didn't find a match. */
error = ENOENT;
di = -1;
ASSERT(index == be16_to_cpu(leaf->hdr.count) || args->oknoent);
out:
if (curbp) {
/* Giving back a data block. */
state->extravalid = 1;
state->extrablk.bp = curbp;
state->extrablk.index = di;
state->extrablk.blkno = curdb;
state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
} else {
state->extravalid = 0;
}
/*
* Return the index, that will be the insertion point.
*/
*indexp = index;
return XFS_ERROR(error);
}
/*
* 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(
xfs_dabuf_t *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->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.
@ -823,9 +868,10 @@ xfs_dir2_leafn_rebalance(
*/
if (!state->inleaf)
blk2->index = blk1->index - be16_to_cpu(leaf1->hdr.count);
/*
* Finally sanity check just to make sure we are not returning a negative index
/*
* Finally sanity check just to make sure we are not returning a
* negative index
*/
if(blk2->index < 0) {
state->inleaf = 1;