xfs_dablk_t
xfs_da_cookie_bno(xfs_mount_t *mp, xfs_off_t cookie)
{
return XFS_DA_COOKIE_BNO(mp, cookie);
}
STATIC int
xfs_dir_node_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio,
int *eofp, dirent_t *dbp, xfs_dir_put_t put)
{
xfs_da_intnode_t *node;
xfs_da_node_entry_t *btree;
xfs_dir_leafblock_t *leaf;
xfs_dablk_t bno, nextbno;
xfs_dahash_t cookhash;
xfs_mount_t *mp;
int error, eob, i;
xfs_dabuf_t *bp;
xfs_daddr_t nextda;
/*
* Pick up our context.
*/
mp = dp->i_mount;
bp = NULL;
bno = XFS_DA_COOKIE_BNO(mp, uio->uio_offset);
cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
xfs_dir_trace_g_du("node: start", dp, uio);
/*
* Re-find our place, even if we're confused about what our place is.
*
* First we check the block number from the magic cookie, it is a
* cache of where we ended last time. If we find a leaf block, and
* the starting hashval in that block is less than our desired
* hashval, then we run with it.
*/
if (bno > 0) {
error = xfs_da_read_buf(trans, dp, bno, -1, &bp, XFS_DATA_FORK);
if ((error != 0) && (error != EFSCORRUPTED))
return(error);
if (bp)
leaf = bp->data;
if (bp && INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC) {
xfs_dir_trace_g_dub("node: block not a leaf",
dp, uio, bno);
xfs_da_brelse(trans, bp);
bp = NULL;
}
if (bp && INT_GET(leaf->entries[0].hashval, ARCH_CONVERT) > cookhash) {
xfs_dir_trace_g_dub("node: leaf hash too large",
dp, uio, bno);
xfs_da_brelse(trans, bp);
bp = NULL;
}
if (bp &&
cookhash > INT_GET(leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT)) {
xfs_dir_trace_g_dub("node: leaf hash too small",
dp, uio, bno);
xfs_da_brelse(trans, bp);
bp = NULL;
}
}
/*
* If we did not find a leaf block from the blockno in the cookie,
* or we there was no blockno in the cookie (eg: first time thru),
* the we start at the top of the Btree and re-find our hashval.
*/
if (bp == NULL) {
xfs_dir_trace_g_du("node: start at root" , dp, uio);
bno = 0;
for (;;) {
error = xfs_da_read_buf(trans, dp, bno, -1, &bp,
XFS_DATA_FORK);
if (error)
return(error);
if (bp == NULL)
return(XFS_ERROR(EFSCORRUPTED));
node = bp->data;
if (INT_GET(node->hdr.info.magic, ARCH_CONVERT) != XFS_DA_NODE_MAGIC)
break;
btree = &node->btree[0];
xfs_dir_trace_g_dun("node: node detail", dp, uio, node);
for (i = 0; i < INT_GET(node->hdr.count, ARCH_CONVERT); btree++, i++) {
if (INT_GET(btree->hashval, ARCH_CONVERT) >= cookhash) {
bno = INT_GET(btree->before, ARCH_CONVERT);
break;
}
}
if (i == INT_GET(node->hdr.count, ARCH_CONVERT)) {
xfs_da_brelse(trans, bp);
xfs_dir_trace_g_du("node: hash beyond EOF",
dp, uio);
uio->uio_offset = XFS_DA_MAKE_COOKIE(mp, 0, 0,
XFS_DA_MAXHASH);
*eofp = 1;
return(0);
}
xfs_dir_trace_g_dub("node: going to block",
dp, uio, bno);
xfs_da_brelse(trans, bp);
}
}
ASSERT(cookhash != XFS_DA_MAXHASH);
/*
* We've dropped down to the (first) leaf block that contains the
* hashval we are interested in. Continue rolling upward thru the
* leaf blocks until we fill up our buffer.
*/
for (;;) {
leaf = bp->data;
if (INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC) {
xfs_dir_trace_g_dul("node: not a leaf", dp, uio, leaf);
xfs_da_brelse(trans, bp);
return XFS_ERROR(EFSCORRUPTED);
}
xfs_dir_trace_g_dul("node: leaf detail", dp, uio, leaf);
if (nextbno = INT_GET(leaf->hdr.info.forw, ARCH_CONVERT)) {
nextda = xfs_da_reada_buf(trans, dp, nextbno,
XFS_DATA_FORK);
} else
nextda = -1;
error = xfs_dir_leaf_getdents_int(bp, dp, bno, uio, &eob, dbp,
put, nextda);
xfs_da_brelse(trans, bp);
bno = nextbno;
if (eob) {
xfs_dir_trace_g_dub("node: E-O-B", dp, uio, bno);
*eofp = 0;
return(error);
}
if (bno == 0)
break;
error = xfs_da_read_buf(trans, dp, bno, nextda, &bp,
XFS_DATA_FORK);
if (error)
return(error);
if (bp == NULL)
return(XFS_ERROR(EFSCORRUPTED));
}
*eofp = 1;
xfs_dir_trace_g_du("node: E-O-F", dp, uio);
return(0);
}
