File: [Development] / xfs-linux-nodel / xfs_attr_leaf.c (download)
Revision 1.9, Fri May 26 00:57:01 1995 UTC (22 years, 5 months ago) by doucette
Branch: MAIN
Changes since 1.8: +18 -18
lines
Put the attribute fork info (i_af) into a zone-allocated structure
pointed to by i_afp, to save memory for inodes that don't use attributes.
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/*
* xfs_attr_leaf.c
*
* GROT: figure out how to recover gracefully when bmap returns ENOSPC.
*/
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/kmem.h>
#include <sys/debug.h>
#include <sys/systm.h>
#include <sys/attributes.h>
#include "xfs_types.h"
#include "xfs_inum.h"
#include <sys/grio.h>
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode_item.h"
#include "xfs_inode.h"
#include "xfs_da_btree.h"
#include "xfs_attr.h"
#include "xfs_attr_leaf.h"
#include "xfs_error.h"
/*
* xfs_attr_leaf.c
*
* Routines to implement leaf blocks of attributes as Btrees of hashed names.
*/
/*========================================================================
* Function prototypes for the kernel.
*========================================================================*/
/*
* Routines used for growing the Btree.
*/
STATIC int xfs_attr_leaf_add_work(xfs_trans_t *trans, buf_t *leaf_buffer,
xfs_da_args_t *args,
int freemap_index);
STATIC void xfs_attr_leaf_compact(xfs_trans_t *trans, buf_t *leaf_buffer);
STATIC void xfs_attr_leaf_rebalance(xfs_da_state_t *state,
xfs_da_state_blk_t *blk1,
xfs_da_state_blk_t *blk2);
STATIC int xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
xfs_da_state_blk_t *leaf_blk_1,
xfs_da_state_blk_t *leaf_blk_2,
int *number_entries_in_blk1,
int *number_usedbytes_in_blk1);
/*
* Utility routines.
*/
STATIC void xfs_attr_leaf_moveents(xfs_attr_leafblock_t *src_leaf,
int src_start,
xfs_attr_leafblock_t *dst_leaf,
int dst_start, int move_count,
xfs_mount_t *mp);
/*========================================================================
* External routines when dirsize < XFS_LITINO(mp).
*========================================================================*/
/*
* Create the initial contents of a shortform attribute list.
*/
int
xfs_attr_shortform_create(xfs_trans_t *trans, xfs_inode_t *dp)
{
xfs_attr_sf_hdr_t *hdr;
ASSERT(dp->i_afp->if_bytes == 0);
if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) {
dp->i_afp->if_flags &= ~XFS_IFEXTENTS; /* just in case */
dp->i_d.di_aformat = XFS_DINODE_FMT_LOCAL;
xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
dp->i_afp->if_flags |= XFS_IFINLINE;
}
ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK);
hdr = (xfs_attr_sf_hdr_t *)dp->i_afp->if_u1.if_data;
hdr->count = 0;
hdr->totsize = sizeof(*hdr);
xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
return(0);
}
/*
* Add a name/value pair to the shortform attribute list.
* Overflow from the inode has already been checked for.
*/
int
xfs_attr_shortform_add(xfs_trans_t *trans, xfs_da_args_t *args)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int i, offset, size;
xfs_inode_t *dp;
dp = args->dp;
ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
if (sfe->namelen != args->namelen)
continue;
if (bcmp(args->name, sfe->nameval, args->namelen) != 0)
continue;
if (((args->flags & ATTR_ROOT) != 0) !=
((sfe->flags & XFS_ATTR_ROOT) != 0))
continue;
return(XFS_ERROR(EEXIST));
}
offset = (char *)sfe - (char *)sf;
size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
xfs_idata_realloc(dp, size, XFS_ATTR_FORK);
sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
sfe = (xfs_attr_sf_entry_t *)((char *)sf + offset);
sfe->namelen = args->namelen;
sfe->valuelen = args->valuelen;
sfe->flags = (args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0;
bcopy(args->name, sfe->nameval, args->namelen);
bcopy(args->value, &sfe->nameval[args->namelen], args->valuelen);
sf->hdr.count++;
sf->hdr.totsize += size;
xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
return(0);
}
/*
* Remove a name from the shortform attribute list structure.
*/
int
xfs_attr_shortform_removename(xfs_trans_t *trans, xfs_da_args_t *args)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int base, size, end, totsize, i;
xfs_inode_t *dp;
dp = args->dp;
ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
base = sizeof(xfs_attr_sf_hdr_t);
sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
base += size, i++) {
size = XFS_ATTR_SF_ENTSIZE(sfe);
if (sfe->namelen != args->namelen)
continue;
if (bcmp(sfe->nameval, args->name, args->namelen) != 0)
continue;
if (((args->flags & ATTR_ROOT) != 0) !=
((sfe->flags & XFS_ATTR_ROOT) != 0))
continue;
break;
}
if (i == sf->hdr.count)
return(XFS_ERROR(ENXIO));
end = base + size;
totsize = sf->hdr.totsize;
if (end != totsize) {
bcopy(&((char *)sf)[end], &((char *)sf)[base], totsize - end);
}
sf->hdr.count--;
sf->hdr.totsize -= size;
xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);
return(0);
}
/*
* Look up a name in a shortform attribute list structure.
*/
/*ARGSUSED*/
int
xfs_attr_shortform_lookup(xfs_trans_t *trans, xfs_da_args_t *args)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int i;
xfs_inode_t *dp;
dp = args->dp;
ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
if (sfe->namelen != args->namelen)
continue;
if (bcmp(args->name, sfe->nameval, args->namelen) != 0)
continue;
if (((args->flags & ATTR_ROOT) != 0) !=
((sfe->flags & XFS_ATTR_ROOT) != 0))
continue;
return(XFS_ERROR(EEXIST));
}
return(XFS_ERROR(ENXIO));
}
/*
* Look up a name in a shortform attribute list structure.
*/
/*ARGSUSED*/
int
xfs_attr_shortform_getvalue(xfs_trans_t *trans, xfs_da_args_t *args)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int i;
xfs_inode_t *dp;
dp = args->dp;
ASSERT(XFS_IFORK_FORMAT(dp, XFS_ATTR_FORK) == XFS_IFINLINE);
sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
if (sfe->namelen != args->namelen)
continue;
if (bcmp(args->name, sfe->nameval, args->namelen) != 0)
continue;
if (((args->flags & ATTR_ROOT) != 0) !=
((sfe->flags & XFS_ATTR_ROOT) != 0))
continue;
args->valuelen = sfe->valuelen;
bcopy(&sfe->nameval[args->namelen], args->value, args->valuelen);
return(XFS_ERROR(EEXIST));
}
return(XFS_ERROR(ENXIO));
}
/*
* Convert from using the shortform to the leaf.
*/
int
xfs_attr_shortform_to_leaf(xfs_trans_t *trans, xfs_da_args_t *iargs)
{
xfs_inode_t *dp;
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
xfs_da_args_t args;
char *tmpbuffer;
int retval, error, i, size;
xfs_fileoff_t blkno;
buf_t *bp;
dp = iargs->dp;
sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
size = sf->hdr.totsize;
tmpbuffer = kmem_alloc(size, KM_SLEEP);
ASSERT(tmpbuffer != NULL);
bcopy(dp->i_afp->if_u1.if_data, tmpbuffer, size);
sf = (xfs_attr_shortform_t *)tmpbuffer;
xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
retval = xfs_da_grow_inode(trans, iargs, 1, &blkno);
if (retval) {
xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
bcopy(tmpbuffer, dp->i_afp->if_u1.if_data, size); /* it back */
goto out;
}
ASSERT(blkno == 0);
retval = xfs_attr_leaf_create(trans, dp, blkno, &bp);
if (retval) {
error = xfs_da_shrink_inode(trans, iargs, 0, 1, bp);
if (error)
goto out;
xfs_idata_realloc(dp, size, XFS_ATTR_FORK); /* try to put */
bcopy(tmpbuffer, dp->i_afp->if_u1.if_data, size); /* it back */
goto out;
}
args.dp = iargs->dp;
args.firstblock = iargs->firstblock;
args.flist = iargs->flist;
args.total = iargs->total;
args.whichfork = XFS_ATTR_FORK;
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count; i++) {
args.name = (char *)sfe->nameval;
args.namelen = sfe->namelen;
args.value = (char *)&sfe->nameval[args.namelen];
args.valuelen = sfe->valuelen;
args.hashval = xfs_da_hashname((char *)sfe->nameval,
sfe->namelen);
args.flags = (sfe->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0;
retval = xfs_attr_leaf_addname(trans, &args);
if (retval)
goto out;
sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
}
retval = 0;
out:
kmem_free(tmpbuffer, size);
return(retval);
}
/*
* Copy out entries for attr_list(), for shortform attribute lists.
*/
/*ARGSUSED*/
int
xfs_attr_shortform_list(xfs_inode_t *dp, attrlist_t *alist, int flags,
attrlist_cursor_kern_t *cursor)
{
xfs_attr_shortform_t *sf;
xfs_attr_sf_entry_t *sfe;
int i;
sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
if (sf->hdr.count == 0)
return(0);
sfe = &sf->list[0];
if (cursor->initted == 0) {
cursor->initted = 1;
cursor->blkno = cursor->index = i = 0;
} else if ((cursor->blkno != 0) || (cursor->index >= sf->hdr.count)) {
cursor->initted = 1;
cursor->blkno = cursor->index = i = 0;
} else { /* GROT: check this code */
for (i = 0; i < cursor->index-1; i++) {
sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
}
if (cursor->hashval != xfs_da_hashname((char *)sfe->nameval,
sfe->namelen)) {
sfe = &sf->list[0];
for (i = 0; i < sf->hdr.count; i++) {
if (cursor->hashval ==
xfs_da_hashname((char *)sfe->nameval,
sfe->namelen)) {
break;
}
sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
}
if (i == sf->hdr.count) {
sfe = &sf->list[0];
for (i = 0; i < cursor->index-1; i++) {
sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
}
}
}
sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
i++;
}
for ( ; i < sf->hdr.count; i++, cursor->index++) {
cursor->hashval = xfs_da_hashname((char *)sfe->nameval,
sfe->namelen);
if (((flags & ATTR_ROOT) != 0) !=
((sfe->flags & XFS_ATTR_ROOT) != 0)) {
;
} else if (xfs_attr_put_listent(alist, (char *)sfe->nameval,
(int)sfe->namelen,
(int)sfe->valuelen,
cursor)) {
return(0);
}
sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
}
return(0);
}
/*
* Check a leaf attribute block to see if all the entries would fit into
* a shortform attribute list.
*/
int
xfs_attr_shortform_allfit(buf_t *bp, xfs_inode_t *dp)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_entry_t *entry;
xfs_attr_leaf_name_local_t *name_loc;
int bytes, i;
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
if (leaf->hdr.usedbytes > XFS_IFORK_ASIZE(dp))
return(0);
/*
* Too close to call, figure it out the hard way.
*/
entry = &leaf->entries[0];
bytes = sizeof(struct xfs_attr_sf_hdr);
for (i = 0; i < leaf->hdr.count; entry++, i++) {
if (!(entry->flags & XFS_ATTR_LOCAL))
return(0);
name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
bytes += sizeof(struct xfs_attr_sf_entry)-1 +
name_loc->namelen + name_loc->valuelen;
}
return( bytes < XFS_IFORK_ASIZE(dp) );
}
/*
* Convert a leaf attribute list to shortform attribute list
*/
int
xfs_attr_leaf_to_shortform(xfs_trans_t *trans, buf_t *bp, xfs_da_args_t *iargs)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_entry_t *entry;
xfs_attr_leaf_name_local_t *name_loc;
xfs_da_args_t args;
xfs_inode_t *dp;
char *tmpbuffer;
int error, i;
dp = iargs->dp;
tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP);
ASSERT(tmpbuffer != NULL);
ASSERT(bp != NULL);
bcopy(bp->b_un.b_addr, tmpbuffer, XFS_LBSIZE(dp->i_mount));
leaf = (xfs_attr_leafblock_t *)tmpbuffer;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
bzero(bp->b_un.b_addr, XFS_LBSIZE(dp->i_mount));
/*
* Clean out the prior contents of the attribute list.
*/
error = xfs_da_shrink_inode(trans, iargs, 0, 1, bp);
if (error)
goto out;
error = xfs_attr_shortform_create(trans, dp);
if (error)
goto out;
/*
* Copy the attributes
*/
entry = &leaf->entries[0];
args.dp = dp;
args.firstblock = iargs->firstblock;
args.flist = iargs->flist;
args.total = iargs->total;
args.whichfork = XFS_ATTR_FORK;
for (i = 0; i < leaf->hdr.count; entry++, i++) {
if (entry->nameidx == 0)
continue;
ASSERT(entry->flags & XFS_ATTR_LOCAL);
name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
args.name = (char *)name_loc->nameval;
args.namelen = name_loc->namelen;
args.value = (char *)&name_loc->nameval[args.namelen];
args.valuelen = name_loc->valuelen;
args.hashval = entry->hashval;
args.flags = (entry->flags & XFS_ATTR_ROOT) ? ATTR_ROOT : 0;
xfs_attr_shortform_add(trans, &args);
}
error = 0;
out:
kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount));
return(error);
}
/*
* Convert from using a single leaf to a root node and a leaf.
*/
int
xfs_attr_leaf_to_node(xfs_trans_t *trans, xfs_da_args_t *args)
{
xfs_attr_leafblock_t *leaf;
xfs_da_intnode_t *node;
xfs_inode_t *dp;
buf_t *bp1, *bp2;
xfs_fileoff_t blkno;
int error;
dp = args->dp;
error = xfs_da_grow_inode(trans, args, 1, &blkno);
ASSERT(blkno == 1);
if (error)
return(error);
error = xfs_da_read_buf(trans, dp, 0, &bp1, XFS_ATTR_FORK);
if (error)
return(error);
ASSERT(bp1 != NULL);
error = xfs_da_get_buf(trans, dp, 1, &bp2, XFS_ATTR_FORK);
if (error)
return(error);
ASSERT(bp2 != NULL);
bcopy(bp1->b_un.b_addr, bp2->b_un.b_addr, XFS_LBSIZE(dp->i_mount));
xfs_trans_log_buf(trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1);
/*
* Set up the new root node.
*/
error = xfs_da_node_create(trans, dp, 0, 1, &bp1, XFS_ATTR_FORK);
if (error)
return(error);
node = (xfs_da_intnode_t *)bp1->b_un.b_addr;
leaf = (xfs_attr_leafblock_t *)bp2->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
node->btree[0].hashval = leaf->entries[ leaf->hdr.count-1 ].hashval;
node->btree[0].before = blkno;
node->hdr.count = 1;
xfs_trans_log_buf(trans, bp1, 0, XFS_LBSIZE(dp->i_mount) - 1);
return(0);
}
/*========================================================================
* Routines used for growing the Btree.
*========================================================================*/
/*
* Create the initial contents of a leaf attribute list
* or a leaf in a node attribute list.
*/
int
xfs_attr_leaf_create(xfs_trans_t *trans, xfs_inode_t *dp, xfs_fileoff_t blkno,
buf_t **bpp)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_hdr_t *hdr;
buf_t *bp;
int retval;
retval = xfs_da_get_buf(trans, dp, blkno, &bp, XFS_ATTR_FORK);
if (retval)
return(retval);
ASSERT(bp != NULL);
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
bzero((char *)leaf, XFS_LBSIZE(dp->i_mount));
hdr = &leaf->hdr;
hdr->info.magic = XFS_ATTR_LEAF_MAGIC;
hdr->firstused = XFS_LBSIZE(dp->i_mount);
if (hdr->firstused == 0)
hdr->firstused = XFS_LBSIZE(dp->i_mount) - 1;
hdr->freemap[0].base = sizeof(xfs_attr_leaf_hdr_t);
hdr->freemap[0].size = hdr->firstused - hdr->freemap[0].base;
xfs_trans_log_buf(trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1);
*bpp = bp;
return(0);
}
/*
* Split the leaf node, rebalance, then add the new entry.
*/
int
xfs_attr_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
xfs_da_state_blk_t *newblk)
{
xfs_fileoff_t blkno;
int error;
/*
* Allocate space for a new leaf node.
*/
ASSERT(oldblk->magic == XFS_ATTR_LEAF_MAGIC);
error = xfs_da_grow_inode(state->trans, state->args, 1, &blkno);
if (error)
return(error);
error = xfs_attr_leaf_create(state->trans, state->args->dp, blkno,
&newblk->bp);
if (error)
return(error);
newblk->blkno = blkno;
newblk->magic = XFS_ATTR_LEAF_MAGIC;
/*
* Rebalance the entries across the two leaves.
*/
xfs_attr_leaf_rebalance(state, oldblk, newblk);
error = xfs_da_blk_link(state, oldblk, newblk);
if (error)
return(error);
/*
* Insert the new entry in the correct block.
*/
if (state->inleaf) {
state->args->aleaf_index = oldblk->index;
state->args->aleaf_blkno = oldblk->blkno;
error = xfs_attr_leaf_add(state->trans, oldblk->bp, state->args);
} else {
state->args->aleaf_index = newblk->index;
state->args->aleaf_blkno = newblk->blkno;
error = xfs_attr_leaf_add(state->trans, newblk->bp, state->args);
}
ASSERT(!error);
/*
* Update last hashval in each block since we added the name.
*/
oldblk->hashval = xfs_attr_leaf_lasthash(oldblk->bp, NULL);
newblk->hashval = xfs_attr_leaf_lasthash(newblk->bp, NULL);
return(0);
}
/*
* Add a name to the leaf attribute list structure.
*/
int
xfs_attr_leaf_add(xfs_trans_t *trans, buf_t *bp, xfs_da_args_t *args)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_hdr_t *hdr;
xfs_attr_leaf_map_t *map;
int tablesize, i, entsize, tmp;
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
ASSERT((args->aleaf_index >= 0) && (args->aleaf_index <= leaf->hdr.count));
hdr = &leaf->hdr;
/*
* Search through freemap for first-fit on new name length.
* (may need to figure in size of entry struct too)
*/
entsize = xfs_attr_leaf_newentsize(args,
trans->t_mountp->m_sb.sb_blocksize,
NULL);
tablesize = (hdr->count + 1) * sizeof(xfs_attr_leaf_entry_t)
+ sizeof(xfs_attr_leaf_hdr_t);
map = &hdr->freemap[XFS_ATTR_LEAF_MAPSIZE-1];
for (i = XFS_ATTR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {
if (map->size == 0)
continue; /* no space in this map */
tmp = entsize;
if (map->base <= hdr->firstused)
tmp += sizeof(xfs_attr_leaf_entry_t);
if ((map->size >= tmp) && (tablesize <= hdr->firstused)) {
tmp = xfs_attr_leaf_add_work(trans, bp, args, i);
return(tmp);
}
}
/*
* If there are no holes in the address space of the block
* where we put names, then compaction will do us no good
* and we should just give up.
*/
if (!hdr->holes)
return(XFS_ERROR(ENOSPC));
/*
* Compact the entries to coalesce free space.
*/
xfs_attr_leaf_compact(trans, bp);
/*
* Search through freemap for first-fit on new name length.
* (this is an exact duplicate of the above code segment)
*/
map = &hdr->freemap[XFS_ATTR_LEAF_MAPSIZE-1];
for (i = XFS_ATTR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {
if (map->size == 0)
continue; /* no space in this map */
tmp = entsize;
if (map->base <= hdr->firstused)
tmp += sizeof(xfs_attr_leaf_entry_t);
if ((map->size >= tmp) && (tablesize <= hdr->firstused)) {
tmp = xfs_attr_leaf_add_work(trans, bp, args, i);
return(tmp);
}
}
return(XFS_ERROR(ENOSPC));
}
/*
* Add a name to a leaf attribute list structure.
*/
STATIC int
xfs_attr_leaf_add_work(xfs_trans_t *trans, buf_t *bp, xfs_da_args_t *args,
int mapindex)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_hdr_t *hdr;
xfs_attr_leaf_entry_t *entry;
xfs_attr_leaf_name_local_t *name_loc;
xfs_attr_leaf_name_remote_t *name_rmt;
xfs_attr_leaf_map_t *map;
xfs_fileoff_t blkno;
xfs_mount_t *mp;
int tmp, i;
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
hdr = &leaf->hdr;
ASSERT((mapindex >= 0) && (mapindex < XFS_ATTR_LEAF_MAPSIZE));
ASSERT((args->aleaf_index >= 0) && (args->aleaf_index <= hdr->count));
/*
* Force open some space in the entry array and fill it in.
*/
entry = &leaf->entries[args->aleaf_index];
if (args->aleaf_index < hdr->count) {
tmp = hdr->count - args->aleaf_index;
tmp *= sizeof(xfs_attr_leaf_entry_t);
bcopy((char *)entry, (char *)(entry+1), tmp);
xfs_trans_log_buf(trans, bp,
XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
}
hdr->count++;
/*
* Allocate space for the new string (at the end of the run).
*/
map = &hdr->freemap[mapindex];
mp = trans->t_mountp;
ASSERT(map->base < XFS_LBSIZE(mp));
ASSERT((map->base & 0x3) == 0);
ASSERT(map->size >= xfs_attr_leaf_newentsize(args,
trans->t_mountp->m_sb.sb_blocksize, NULL));
ASSERT(map->size < XFS_LBSIZE(mp));
ASSERT((map->size & 0x3) == 0);
map->size -= xfs_attr_leaf_newentsize(args,
trans->t_mountp->m_sb.sb_blocksize, &tmp);
entry->nameidx = map->base + map->size;
entry->hashval = args->hashval;
entry->flags = tmp ? XFS_ATTR_LOCAL : 0;
entry->flags |= (args->flags & ATTR_ROOT) ? XFS_ATTR_ROOT : 0;
xfs_trans_log_buf(trans, bp, XFS_DA_LOGRANGE(leaf, entry,
sizeof(*entry)));
/*
* Copy the attribute name and value into the new space.
*
* For "remote" attribute values, simply identify the file-relative
* logical blocks that will be used to store the value. We cannot
* actually allocate the extents in this transaction, it would take
* too much log space, so we delay that until after we commit this
* transaction.
*/
if (entry->flags & XFS_ATTR_LOCAL) {
name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->aleaf_index);
name_loc->namelen = args->namelen;
name_loc->valuelen = args->valuelen;
bcopy(args->name, (char *)name_loc->nameval, args->namelen);
bcopy(args->value, (char *)&name_loc->nameval[args->namelen],
name_loc->valuelen);
} else {
name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->aleaf_index);
name_rmt->namelen = args->namelen;
bcopy(args->name, (char *)name_rmt->name, args->namelen);
name_rmt->valuelen = 0; /* just in case grow_inode() fails */
name_rmt->valueblk = 0;
tmp = xfs_bmap_first_unused(trans, args->dp,
(xfs_extlen_t)XFS_B_TO_FSB(mp, args->valuelen),
&blkno, args->whichfork);
if (tmp)
return(tmp);
name_rmt->valuelen = args->valuelen;
name_rmt->valueblk = blkno; /* fill in value bytes later */
entry->flags |= XFS_ATTR_INCOMPLETE;
args->aleaf_rmtblkno = blkno;
}
xfs_trans_log_buf(trans, bp,
XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->aleaf_index),
xfs_attr_leaf_entsize(leaf, args->aleaf_index)));
/*
* Update the control info for this leaf node
*/
if (entry->nameidx < hdr->firstused)
hdr->firstused = entry->nameidx;
ASSERT(hdr->firstused >= ((hdr->count*sizeof(*entry))+sizeof(*hdr)));
tmp = (hdr->count-1) * sizeof(xfs_attr_leaf_entry_t)
+ sizeof(xfs_attr_leaf_hdr_t);
map = &hdr->freemap[0];
for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
if (map->base == tmp) {
map->base += sizeof(xfs_attr_leaf_entry_t);
map->size -= sizeof(xfs_attr_leaf_entry_t);
}
}
hdr->usedbytes += xfs_attr_leaf_entsize(leaf, args->aleaf_index);
xfs_trans_log_buf(trans, bp, XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
return(0);
}
/*
* Garbage collect a leaf attribute list block by copying it to a new buffer.
*/
STATIC void
xfs_attr_leaf_compact(xfs_trans_t *trans, buf_t *bp)
{
xfs_attr_leafblock_t *leaf_s, *leaf_d;
xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
xfs_mount_t *mp;
char *tmpbuffer;
mp = trans->t_mountp;
tmpbuffer = kmem_alloc(XFS_LBSIZE(mp), KM_SLEEP);
ASSERT(tmpbuffer != NULL);
bcopy(bp->b_un.b_addr, tmpbuffer, XFS_LBSIZE(mp));
bzero(bp->b_un.b_addr, XFS_LBSIZE(mp));
/*
* Copy basic information
*/
leaf_s = (xfs_attr_leafblock_t *)tmpbuffer;
leaf_d = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
hdr_s = &leaf_s->hdr;
hdr_d = &leaf_d->hdr;
hdr_d->info = hdr_s->info; /* struct copy */
hdr_d->firstused = XFS_LBSIZE(mp);
if (hdr_d->firstused == 0)
hdr_d->firstused = XFS_LBSIZE(mp) - 1;
hdr_d->usedbytes = 0;
hdr_d->count = 0;
hdr_d->holes = 0;
hdr_d->freemap[0].base = sizeof(xfs_attr_leaf_hdr_t);
hdr_d->freemap[0].size = hdr_d->firstused - hdr_d->freemap[0].base;
/*
* Copy all entry's in the same (sorted) order,
* but allocate name/value pairs packed and in sequence.
*/
{ int tmp;
tmp = hdr_s->usedbytes;
xfs_attr_leaf_moveents(leaf_s, 0, leaf_d, 0, (int)hdr_s->count, mp);
ASSERT(hdr_s->usedbytes == 0);
ASSERT(hdr_d->usedbytes == tmp);
}
xfs_trans_log_buf(trans, bp, 0, XFS_LBSIZE(mp) - 1);
kmem_free(tmpbuffer, XFS_LBSIZE(mp));
}
/*
* Redistribute the attribute list entries between two leaf nodes,
* taking into account the size of the new entry.
*
* NOTE: if new block is empty, then it will get the upper half of old block.
*/
STATIC void
xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
xfs_da_state_blk_t *blk2)
{
xfs_da_state_blk_t *tmp_blk;
xfs_attr_leafblock_t *leaf1, *leaf2;
xfs_attr_leaf_hdr_t *hdr1, *hdr2;
int count, totallen, max, space, swap;
/*
* Set up environment.
*/
ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC);
ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC);
leaf1 = (xfs_attr_leafblock_t *)blk1->bp->b_un.b_addr;
leaf2 = (xfs_attr_leafblock_t *)blk2->bp->b_un.b_addr;
ASSERT(leaf1->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
ASSERT(leaf2->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
/*
* Check ordering of blocks, reverse if it makes things simpler.
*/
swap = 0;
if (xfs_attr_leaf_order(blk1->bp, blk2->bp)) {
tmp_blk = blk1;
blk1 = blk2;
blk2 = tmp_blk;
leaf1 = (xfs_attr_leafblock_t *)blk1->bp->b_un.b_addr;
leaf2 = (xfs_attr_leafblock_t *)blk2->bp->b_un.b_addr;
swap = 1;
}
hdr1 = &leaf1->hdr;
hdr2 = &leaf2->hdr;
/*
* Examine entries until we reduce the absolute difference in
* byte usage between the two blocks to a minimum. Then get
* the direction to copy and the number of elements to move.
*/
state->inleaf = xfs_attr_leaf_figure_balance(state, blk1, blk2,
&count, &totallen);
if (swap)
state->inleaf = !state->inleaf;
/*
* Move any entries required from leaf to leaf:
*/
if (count < hdr1->count) {
/*
* Figure the total bytes to be added to the destination leaf.
*/
count = hdr1->count - count; /* number entries being moved */
space = hdr1->usedbytes - totallen;
space += count * sizeof(xfs_attr_leaf_entry_t);
/*
* leaf2 is the destination, compact it if it looks tight.
*/
max = hdr2->firstused - sizeof(xfs_attr_leaf_hdr_t);
max -= hdr2->count * sizeof(xfs_attr_leaf_entry_t);
if (space > max) {
xfs_attr_leaf_compact(state->trans, blk2->bp);
}
/*
* Move high entries from leaf1 to low end of leaf2.
*/
xfs_attr_leaf_moveents(leaf1, hdr1->count - count,
leaf2, 0, count, state->mp);
xfs_trans_log_buf(state->trans, blk1->bp, 0, state->blocksize-1);
xfs_trans_log_buf(state->trans, blk2->bp, 0, state->blocksize-1);
} else if (count > hdr1->count) {
/*
* Figure the total bytes to be added to the destination leaf.
*/
count -= hdr1->count; /* number entries being moved */
space = totallen - hdr1->usedbytes;
space += count * sizeof(xfs_attr_leaf_entry_t);
/*
* leaf1 is the destination, compact it if it looks tight.
*/
max = hdr1->firstused - sizeof(xfs_attr_leaf_hdr_t);
max -= hdr1->count * sizeof(xfs_attr_leaf_entry_t);
if (space > max) {
xfs_attr_leaf_compact(state->trans, blk1->bp);
}
/*
* Move low entries from leaf2 to high end of leaf1.
*/
xfs_attr_leaf_moveents(leaf2, 0, leaf1, (int)hdr1->count,
count, state->mp);
xfs_trans_log_buf(state->trans, blk1->bp, 0, state->blocksize-1);
xfs_trans_log_buf(state->trans, blk2->bp, 0, state->blocksize-1);
}
/*
* Copy out last hashval in each block for B-tree code.
*/
blk1->hashval = leaf1->entries[ leaf1->hdr.count-1 ].hashval;
blk2->hashval = leaf2->entries[ leaf2->hdr.count-1 ].hashval;
/*
* Adjust the expected index for insertion.
* GROT: this doesn't work unless blk2 was originally empty.
*/
if (!state->inleaf) {
blk2->index = blk1->index - leaf1->hdr.count;
}
}
/*
* Examine entries until we reduce the absolute difference in
* byte usage between the two blocks to a minimum.
* GROT: Is this really necessary? With other than a 512 byte blocksize,
* GROT: there will always be enough room in either block for a new entry.
* GROT: Do a double-split for this case?
*/
STATIC int
xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
xfs_da_state_blk_t *blk1,
xfs_da_state_blk_t *blk2,
int *countarg, int *usedbytesarg)
{
xfs_attr_leafblock_t *leaf1, *leaf2;
xfs_attr_leaf_hdr_t *hdr1, *hdr2;
xfs_attr_leaf_entry_t *entry;
int count, max, index, totallen, half;
int lastdelta, foundit, tmp;
/*
* Set up environment.
*/
leaf1 = (xfs_attr_leafblock_t *)blk1->bp->b_un.b_addr;
leaf2 = (xfs_attr_leafblock_t *)blk2->bp->b_un.b_addr;
hdr1 = &leaf1->hdr;
hdr2 = &leaf2->hdr;
foundit = 0;
totallen = 0;
/*
* Examine entries until we reduce the absolute difference in
* byte usage between the two blocks to a minimum.
*/
max = hdr1->count + hdr2->count;
half = (max+1) * sizeof(*entry);
half += hdr1->usedbytes + hdr2->usedbytes +
xfs_attr_leaf_newentsize(state->args,
state->blocksize, NULL);
half /= 2;
lastdelta = state->blocksize;
entry = &leaf1->entries[0];
for (count = index = 0; count < max; entry++, index++, count++) {
#define XFS_ATTR_ABS(A) (((A) < 0) ? -(A) : (A))
/*
* The new entry is in the first block, account for it.
*/
if (count == blk1->index) {
tmp = totallen + sizeof(*entry) +
xfs_attr_leaf_newentsize(state->args,
state->blocksize,
NULL);
if (XFS_ATTR_ABS(half - tmp) > lastdelta)
break;
lastdelta = XFS_ATTR_ABS(half - tmp);
totallen = tmp;
foundit = 1;
}
/*
* Wrap around into the second block if necessary.
*/
if (count == hdr1->count) {
leaf1 = leaf2;
entry = &leaf1->entries[0];
index = 0;
}
/*
* Figure out if next leaf entry would be too much.
*/
tmp = totallen + sizeof(*entry) + xfs_attr_leaf_entsize(leaf1,
index);
if (XFS_ATTR_ABS(half - tmp) > lastdelta)
break;
lastdelta = XFS_ATTR_ABS(half - tmp);
totallen = tmp;
#undef XFS_ATTR_ABS
}
/*
* Calculate the number of usedbytes that will end up in lower block.
* If new entry not in lower block, fix up the count.
*/
totallen -= count * sizeof(*entry);
if (foundit) {
totallen -= sizeof(*entry) +
xfs_attr_leaf_newentsize(state->args,
state->blocksize,
NULL);
}
*countarg = count;
*usedbytesarg = totallen;
return(foundit);
}
/*========================================================================
* Routines used for shrinking the Btree.
*========================================================================*/
/*
* 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
xfs_attr_leaf_toosmall(xfs_da_state_t *state, int *action)
{
xfs_attr_leafblock_t *leaf;
xfs_da_state_blk_t *blk;
xfs_da_blkinfo_t *info;
int count, bytes, forward, error, retval, i;
xfs_fileoff_t blkno;
buf_t *bp;
/*
* 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 ];
info = (xfs_da_blkinfo_t *)blk->bp->b_un.b_addr;
ASSERT(info->magic == XFS_ATTR_LEAF_MAGIC);
leaf = (xfs_attr_leafblock_t *)info;
count = leaf->hdr.count;
bytes = sizeof(xfs_attr_leaf_hdr_t) +
count * sizeof(xfs_attr_leaf_entry_t) +
leaf->hdr.usedbytes;
if (bytes > (state->blocksize >> 1)) {
*action = 0; /* blk over 50%, dont try to join */
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 (aribtrarily)
* 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 = (info->forw != 0);
bcopy(&state->path, &state->altpath, sizeof(state->path));
error = xfs_da_path_shift(state, &state->altpath, forward,
0, &retval);
if (error)
return(error);
if (retval) {
*action = 0;
} else {
*action = 2;
}
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 an attribute list over time.
*/
forward = (info->forw < info->back); /* start with smaller blk num */
for (i = 0; i < 2; forward = !forward, i++) {
if (forward)
blkno = info->forw;
else
blkno = info->back;
if (blkno == 0)
continue;
error = xfs_da_read_buf(state->trans, state->args->dp, blkno,
&bp, XFS_ATTR_FORK);
if (error)
return(error);
ASSERT(bp != NULL);
leaf = (xfs_attr_leafblock_t *)info;
count = leaf->hdr.count;
bytes = state->blocksize - (state->blocksize>>2);
bytes -= leaf->hdr.usedbytes;
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
count += leaf->hdr.count;
bytes -= leaf->hdr.usedbytes;
bytes -= count * sizeof(xfs_attr_leaf_entry_t);
bytes -= sizeof(xfs_attr_leaf_hdr_t);
if (bytes >= 0)
break; /* fits with at least 25% to spare */
xfs_trans_brelse(state->trans, bp);
}
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.
*/
bcopy(&state->path, &state->altpath, sizeof(state->path));
if (blkno < blk->blkno) {
error = xfs_da_path_shift(state, &state->altpath, forward,
0, &retval);
} else {
error = xfs_da_path_shift(state, &state->path, forward,
0, &retval);
}
if (error)
return(error);
if (retval) {
*action = 0;
} else {
*action = 1;
}
return(0);
}
/*
* Remove a name from the leaf attribute list structure.
*
* Return 1 if leaf is less than 37% full, 0 if >= 37% full.
* If two leaves are 37% full, when combined they will leave 25% free.
*/
int
xfs_attr_leaf_remove(xfs_trans_t *trans, buf_t *bp, xfs_da_args_t *args)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_hdr_t *hdr;
xfs_attr_leaf_map_t *map;
xfs_attr_leaf_entry_t *entry;
int before, after, smallest, entsize;
int tablesize, tmp, i;
xfs_mount_t *mp;
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
hdr = &leaf->hdr;
mp = trans->t_mountp;
ASSERT((hdr->count > 0) && (hdr->count < (XFS_LBSIZE(mp)/8)));
ASSERT((args->aleaf_index >= 0) && (args->aleaf_index < hdr->count));
ASSERT(hdr->firstused >= ((hdr->count*sizeof(*entry))+sizeof(*hdr)));
entry = &leaf->entries[args->aleaf_index];
ASSERT(entry->nameidx >= hdr->firstused);
ASSERT(entry->nameidx < XFS_LBSIZE(mp));
#if 0
/*
* GROT: check this code, it is probably not needed.
*
* Set up to deallocate the blocks associated with a "remote"
* attribute's value. We actually do the deallocation later in
* a separate transaction so that we don't overfill this one.
*/
if (!(entry->flags & XFS_ATTR_LOCAL)) {
entry->flags |= XFS_ATTR_INCOMPLETE;
}
#endif
/*
* Scan through free region table:
* check for adjacency of free'd entry with an existing one,
* find smallest free region in case we need to replace it,
* adjust any map that borders the entry table,
*/
tablesize = hdr->count * sizeof(xfs_attr_leaf_entry_t)
+ sizeof(xfs_attr_leaf_hdr_t);
map = &hdr->freemap[0];
tmp = map->size;
before = after = -1;
smallest = XFS_ATTR_LEAF_MAPSIZE - 1;
entsize = xfs_attr_leaf_entsize(leaf, args->aleaf_index);
for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {
ASSERT(map->base < XFS_LBSIZE(mp));
ASSERT(map->size < XFS_LBSIZE(mp));
if (map->base == tablesize) {
map->base -= sizeof(xfs_attr_leaf_entry_t);
map->size += sizeof(xfs_attr_leaf_entry_t);
}
if ((map->base + map->size) == entry->nameidx) {
before = i;
} else if (map->base == (entry->nameidx + entsize)) {
after = i;
} else if (map->size < tmp) {
tmp = map->size;
smallest = i;
}
}
/*
* Coalesce adjacent freemap regions,
* or replace the smallest region.
*/
if ((before >= 0) || (after >= 0)) {
if ((before >= 0) && (after >= 0)) {
map = &hdr->freemap[before];
map->size += entsize;
map->size += hdr->freemap[after].size;
hdr->freemap[after].base = 0;
hdr->freemap[after].size = 0;
} else if (before >= 0) {
map = &hdr->freemap[before];
map->size += entsize;
} else {
map = &hdr->freemap[after];
map->base = entry->nameidx;
map->size += entsize;
}
} else {
/*
* Replace smallest region (if it is smaller than free'd entry)
*/
map = &hdr->freemap[smallest];
if (map->size < entsize) {
map->base = entry->nameidx;
map->size = entsize;
}
}
/*
* Did we remove the first entry?
*/
if (entry->nameidx == hdr->firstused)
smallest = 1;
else
smallest = 0;
/*
* Compress the remaining entries and zero out the removed stuff.
*/
bzero(XFS_ATTR_LEAF_NAME(leaf, args->aleaf_index), entsize);
hdr->usedbytes -= entsize;
xfs_trans_log_buf(trans, bp,
XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->aleaf_index),
entsize));
tmp = (hdr->count - args->aleaf_index) * sizeof(xfs_attr_leaf_entry_t);
bcopy((char *)(entry+1), (char *)entry, tmp);
hdr->count--;
xfs_trans_log_buf(trans, bp,
XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
entry = &leaf->entries[hdr->count];
bzero((char *)entry, sizeof(xfs_attr_leaf_entry_t));
/*
* If we removed the first entry, re-find the first used byte
* in the name area. Note that if the entry was the "firstused",
* then we don't have a "hole" in our block resulting from
* removing the name.
*/
if (smallest) {
tmp = XFS_LBSIZE(mp);
entry = &leaf->entries[0];
for (i = hdr->count-1; i >= 0; entry++, i--) {
ASSERT(entry->nameidx >= hdr->firstused);
ASSERT(entry->nameidx < XFS_LBSIZE(mp));
if (entry->nameidx < tmp)
tmp = entry->nameidx;
}
hdr->firstused = tmp;
if (hdr->firstused == 0)
hdr->firstused = tmp - 1;
} else {
hdr->holes = 1; /* mark as needing compaction */
}
xfs_trans_log_buf(trans, bp, XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
/*
* Check if leaf is less than 50% full, caller may want to
* "join" the leaf with a sibling if so.
*/
tmp = sizeof(xfs_attr_leaf_hdr_t);
tmp += leaf->hdr.count * sizeof(xfs_attr_leaf_entry_t);
tmp += leaf->hdr.usedbytes;
return(tmp < (XFS_LBSIZE(mp)*37/100)); /* leaf is < 37% full */
}
/*
* Move all the attribute list entries from drop_leaf into save_leaf.
*/
void
xfs_attr_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
xfs_da_state_blk_t *save_blk)
{
xfs_attr_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf;
xfs_attr_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr;
xfs_mount_t *mp;
char *tmpbuffer;
/*
* Set up environment.
*/
mp = state->mp;
ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC);
ASSERT(save_blk->magic == XFS_ATTR_LEAF_MAGIC);
drop_leaf = (xfs_attr_leafblock_t *)drop_blk->bp->b_un.b_addr;
save_leaf = (xfs_attr_leafblock_t *)save_blk->bp->b_un.b_addr;
ASSERT(drop_leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
ASSERT(save_leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
drop_hdr = &drop_leaf->hdr;
save_hdr = &save_leaf->hdr;
/*
* Save last hashval from dying block for later Btree fixup.
*/
drop_blk->hashval = drop_leaf->entries[ drop_leaf->hdr.count-1 ].hashval;
/*
* Check if we need a temp buffer, or can we do it in place.
* Note that we don't check "leaf" for holes because we will
* always be dropping it, toosmall() decided that for us already.
*/
if (save_hdr->holes == 0) {
/*
* dest leaf has no holes, so we add there. May need
* to make some room in the entry array.
*/
if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, 0,
(int)drop_hdr->count, mp);
} else {
xfs_attr_leaf_moveents(drop_leaf, 0,
save_leaf, save_hdr->count,
(int)drop_hdr->count, mp);
}
} else {
/*
* Destination has holes, so we make a temporary copy
* of the leaf and add them both to that.
*/
tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP);
ASSERT(tmpbuffer != NULL);
bzero(tmpbuffer, state->blocksize);
tmp_leaf = (xfs_attr_leafblock_t *)tmpbuffer;
tmp_hdr = &tmp_leaf->hdr;
tmp_hdr->info = save_hdr->info; /* struct copy */
tmp_hdr->count = 0;
tmp_hdr->firstused = state->blocksize;
if (tmp_hdr->firstused == 0)
tmp_hdr->firstused = state->blocksize - 1;
tmp_hdr->usedbytes = 0;
if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, 0,
(int)drop_hdr->count, mp);
xfs_attr_leaf_moveents(save_leaf, 0,
tmp_leaf, tmp_leaf->hdr.count,
(int)save_hdr->count, mp);
} else {
xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, 0,
(int)save_hdr->count, mp);
xfs_attr_leaf_moveents(drop_leaf, 0,
tmp_leaf, tmp_leaf->hdr.count,
(int)drop_hdr->count, mp);
}
bcopy((char *)tmp_leaf, (char *)save_leaf, state->blocksize);
kmem_free(tmpbuffer, state->blocksize);
}
xfs_trans_log_buf(state->trans, save_blk->bp, 0, state->blocksize - 1);
/*
* Copy out last hashval in each block for B-tree code.
*/
save_blk->hashval = save_leaf->entries[ save_leaf->hdr.count-1 ].hashval;
}
/*========================================================================
* Routines used for finding things in the Btree.
*========================================================================*/
/*
* Look up a name in a leaf attribute list structure.
* This is the internal routine, it uses the caller's buffer.
*
* Note that duplicate keys are allowed, but only check within the
* current leaf node. The Btree code must check in adjacent leaf nodes.
*
* Return in args->aleaf_index the index into the entry[] array of either
* the found entry, or where the entry should have been (insert before
* that entry).
*
* Don't change the args->value unless we find the attribute.
*/
int
xfs_attr_leaf_lookup_int(buf_t *bp, xfs_da_args_t *args)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_entry_t *entry;
xfs_attr_leaf_name_local_t *name_loc;
xfs_attr_leaf_name_remote_t *name_rmt;
int probe, span;
uint hashval;
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
ASSERT((((int)leaf->hdr.count) >= 0) && \
(leaf->hdr.count < (XFS_LBSIZE(args->dp->i_mount)/8)));
/*
* Binary search. (note: small blocks will skip this loop)
*/
hashval = args->hashval;
probe = span = leaf->hdr.count / 2;
for (entry = &leaf->entries[probe]; span > 4;
entry = &leaf->entries[probe]) {
span /= 2;
if (entry->hashval < hashval)
probe += span;
else if (entry->hashval > hashval)
probe -= span;
else
break;
}
ASSERT((probe >= 0) && \
((leaf->hdr.count == 0) || (probe < leaf->hdr.count)));
ASSERT((span <= 4) || (entry->hashval == hashval));
/*
* Since we may have duplicate hashval's, find the first matching
* hashval in the leaf.
*/
while ((probe > 0) && (entry->hashval >= hashval)) {
entry--;
probe--;
}
while ((probe < leaf->hdr.count) && (entry->hashval < hashval)) {
entry++;
probe++;
}
if ((probe == leaf->hdr.count) || (entry->hashval != hashval)) {
args->aleaf_index = probe;
return(ENXIO);
}
/*
* Duplicate keys may be present, so search all of them for a match.
*/
for ( ; (probe < leaf->hdr.count) && (entry->hashval == hashval);
entry++, probe++) {
/*
* GROT: Add code to remove incomplete entries.
*/
if (entry->flags & XFS_ATTR_INCOMPLETE)
continue; /* skip incomplete entries */
if (entry->flags & XFS_ATTR_LOCAL) {
name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, probe);
if (name_loc->namelen != args->namelen)
continue;
if (bcmp(args->name, (char *)name_loc->nameval,
args->namelen) != 0)
continue;
if (((args->flags & ATTR_ROOT) != 0) !=
((entry->flags & XFS_ATTR_ROOT) != 0))
continue;
args->aleaf_index = probe;
return(EEXIST);
} else {
name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, probe);
if (name_rmt->namelen != args->namelen)
continue;
if (bcmp(args->name, (char *)name_rmt->name,
args->namelen) != 0)
continue;
if (((args->flags & ATTR_ROOT) != 0) !=
((entry->flags & XFS_ATTR_ROOT) != 0))
continue;
args->aleaf_index = probe;
return(EEXIST);
}
}
args->aleaf_index = probe;
return(ENXIO);
}
/*
* Get the value associated with an attribute name from a leaf attribute
* list structure.
*/
int
xfs_attr_leaf_getvalue(buf_t *bp, xfs_da_args_t *args)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_entry_t *entry;
xfs_attr_leaf_name_local_t *name_loc;
xfs_attr_leaf_name_remote_t *name_rmt;
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
ASSERT((((int)leaf->hdr.count) >= 0) && \
(leaf->hdr.count < (XFS_LBSIZE(args->dp->i_mount)/8)));
ASSERT(args->aleaf_index < ((int)leaf->hdr.count));
entry = &leaf->entries[args->aleaf_index];
if (entry->flags & XFS_ATTR_LOCAL) {
name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->aleaf_index);
ASSERT(name_loc->namelen == args->namelen);
ASSERT(bcmp(args->name, name_loc->nameval, args->namelen) == 0);
if (args->valuelen < name_loc->valuelen) {
args->valuelen = name_loc->valuelen;
return(E2BIG);
}
args->valuelen = name_loc->valuelen;
bcopy(&name_loc->nameval[args->namelen], args->value,
args->valuelen);
} else {
name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->aleaf_index);
ASSERT(name_rmt->namelen == args->namelen);
ASSERT(bcmp(args->name, name_rmt->name, args->namelen) == 0);
if (args->valuelen < name_rmt->valuelen) {
args->valuelen = name_rmt->valuelen;
return(E2BIG);
}
args->valuelen = name_rmt->valuelen;
args->aleaf_rmtblkno = name_rmt->valueblk;
}
return(0);
}
/*========================================================================
* Utility routines.
*========================================================================*/
/*
* Move the indicated entries from one leaf to another.
* NOTE: this routine modifies both source and destination leaves.
*/
/*ARGSUSED*/
STATIC void
xfs_attr_leaf_moveents(xfs_attr_leafblock_t *leaf_s, int start_s,
xfs_attr_leafblock_t *leaf_d, int start_d,
int count, xfs_mount_t *mp)
{
xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
xfs_attr_leaf_entry_t *entry_s, *entry_d;
int tmp, i;
/*
* Check for nothing to do.
*/
if (count == 0)
return;
/*
* Set up environment.
*/
ASSERT(leaf_s->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
ASSERT(leaf_d->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
hdr_s = &leaf_s->hdr;
hdr_d = &leaf_d->hdr;
ASSERT((hdr_s->count > 0) && (hdr_s->count < (XFS_LBSIZE(mp)/8)));
ASSERT(hdr_s->firstused >=
((hdr_s->count*sizeof(*entry_s))+sizeof(*hdr_s)));
ASSERT(((int)(hdr_d->count) >= 0) &&
(hdr_d->count < (XFS_LBSIZE(mp)/8)));
ASSERT(hdr_d->firstused >=
((hdr_d->count*sizeof(*entry_d))+sizeof(*hdr_d)));
ASSERT(start_s < hdr_s->count);
ASSERT(start_d <= hdr_d->count);
ASSERT(count <= hdr_s->count);
/*
* Move the entries in the destination leaf up to make a hole?
*/
if (start_d < hdr_d->count) {
tmp = hdr_d->count - start_d;
tmp *= sizeof(xfs_attr_leaf_entry_t);
entry_s = &leaf_d->entries[start_d];
entry_d = &leaf_d->entries[start_d + count];
bcopy((char *)entry_s, (char *)entry_d, tmp);
}
/*
* Copy all entry's in the same (sorted) order,
* but allocate attribute info packed and in sequence.
*/
entry_s = &leaf_s->entries[start_s];
entry_d = &leaf_d->entries[start_d];
for (i = 0; i < count; entry_s++, entry_d++, i++) {
ASSERT(entry_s->nameidx >= hdr_s->firstused);
tmp = xfs_attr_leaf_entsize(leaf_s, start_s + i);
hdr_d->firstused -= tmp;
entry_d->hashval = entry_s->hashval;
entry_d->nameidx = hdr_d->firstused;
entry_d->flags = entry_s->flags;
ASSERT(entry_d->nameidx + tmp <= XFS_LBSIZE(mp));
bcopy(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i),
XFS_ATTR_LEAF_NAME(leaf_d, start_d + i), tmp);
ASSERT(entry_s->nameidx + tmp <= XFS_LBSIZE(mp));
bzero(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), tmp);
hdr_s->usedbytes -= tmp;
hdr_d->usedbytes += tmp;
hdr_s->count--;
hdr_d->count++;
tmp = hdr_d->count * sizeof(xfs_attr_leaf_entry_t)
+ sizeof(xfs_attr_leaf_hdr_t);
ASSERT(hdr_d->firstused >= tmp);
}
/*
* Zero out the entries we just copied.
*/
if (start_s == hdr_s->count) {
tmp = count * sizeof(xfs_attr_leaf_entry_t);
entry_s = &leaf_s->entries[start_s];
ASSERT(((char *)entry_s + tmp) <=
((char *)leaf_s + XFS_LBSIZE(mp)));
bzero((char *)entry_s, tmp);
} else {
/*
* Move the remaining entries down to fill the hole,
* then zero the entries at the top.
*/
tmp = hdr_s->count - count;
tmp *= sizeof(xfs_attr_leaf_entry_t);
entry_s = &leaf_s->entries[start_s + count];
entry_d = &leaf_s->entries[start_s];
bcopy((char *)entry_s, (char *)entry_d, tmp);
tmp = count * sizeof(xfs_attr_leaf_entry_t);
entry_s = &leaf_s->entries[hdr_s->count];
ASSERT(((char *)entry_s + tmp) <=
((char *)leaf_s + XFS_LBSIZE(mp)));
bzero((char *)entry_s, tmp);
}
/*
* Fill in the freemap information
*/
hdr_d->freemap[0].base = hdr_d->count*sizeof(xfs_attr_leaf_entry_t);
hdr_d->freemap[0].base += sizeof(xfs_attr_leaf_hdr_t);
hdr_d->freemap[0].size = hdr_d->firstused - hdr_d->freemap[0].base;
hdr_s->holes = 1; /* leaf may not be compact */
}
/*
* Compare two leaf blocks "order".
*/
int
xfs_attr_leaf_order(buf_t *leaf1_bp, buf_t *leaf2_bp)
{
xfs_attr_leafblock_t *leaf1, *leaf2;
leaf1 = (xfs_attr_leafblock_t *)leaf1_bp->b_un.b_addr;
leaf2 = (xfs_attr_leafblock_t *)leaf2_bp->b_un.b_addr;
ASSERT((leaf1->hdr.info.magic == XFS_ATTR_LEAF_MAGIC) && \
(leaf2->hdr.info.magic == XFS_ATTR_LEAF_MAGIC));
if ((leaf1->hdr.count > 0) && (leaf2->hdr.count > 0) &&
((leaf2->entries[ 0 ].hashval <
leaf1->entries[ 0 ].hashval) ||
(leaf2->entries[ leaf2->hdr.count-1 ].hashval <
leaf1->entries[ leaf1->hdr.count-1 ].hashval))) {
return(1);
}
return(0);
}
/*
* Pick up the last hashvalue from a leaf block.
*/
uint
xfs_attr_leaf_lasthash(buf_t *bp, int *count)
{
xfs_attr_leafblock_t *leaf;
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
if (count) {
*count = leaf->hdr.count;
}
return(leaf->entries[ leaf->hdr.count-1 ].hashval);
}
/*
* Calculate the number of bytes used to store the indicated attribute
* (whether local or remote only calculate bytes in this block).
*/
int
xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index)
{
xfs_attr_leaf_name_local_t *name_loc;
xfs_attr_leaf_name_remote_t *name_rmt;
int size;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
if (leaf->entries[index].flags & XFS_ATTR_LOCAL) {
name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, index);
size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(name_loc->namelen,
name_loc->valuelen);
} else {
name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, index);
size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(name_rmt->namelen);
}
return(size);
}
/*
* Calculate the number of bytes that would be required to store the new
* attribute (whether local or remote only calculate bytes in this block).
* This routine decides as a side effect whether the attribute will be
* a "local" or a "remote" attribute.
*/
int
xfs_attr_leaf_newentsize(xfs_da_args_t *args, int blocksize, int *local)
{
int size;
if (args->valuelen < XFS_ATTR_LEAF_ENTSIZE_LOCAL_MAX(blocksize)) {
size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(args->namelen,
args->valuelen);
if (local) {
*local = 1;
}
} else {
size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(args->namelen);
if (local) {
*local = 0;
}
}
return(size);
}
/*
* Copy out attribute list entries for attr_list(), for leaf attribute lists.
*/
int
xfs_attr_leaf_list_int(buf_t *bp, attrlist_t *alist, int flags,
attrlist_cursor_kern_t *cursor)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_entry_t *entry;
xfs_attr_leaf_name_local_t *name_loc;
xfs_attr_leaf_name_remote_t *name_rmt;
int retval, i;
ASSERT(bp != NULL);
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
if (cursor->index >= leaf->hdr.count)
cursor->index = 0;
cursor->initted = 1;
entry = &leaf->entries[ cursor->index ];
retval = 0;
for (i = cursor->index; i < leaf->hdr.count; entry++, i++) {
if (entry->hashval < cursor->hashval)
continue;
if (entry->flags & XFS_ATTR_INCOMPLETE)
continue; /* skip incomplete entries */
cursor->hashval = entry->hashval;
cursor->index = i;
/* GROT: check this changed-attr-list recovery code */
if (((flags & ATTR_ROOT) != 0) !=
((entry->flags & XFS_ATTR_ROOT) != 0))
continue;
if (entry->flags & XFS_ATTR_LOCAL) {
name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
retval = xfs_attr_put_listent(alist,
(char *)name_loc->nameval,
(int)name_loc->namelen,
(int)name_loc->valuelen, cursor);
} else {
name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
retval = xfs_attr_put_listent(alist,
(char *)name_rmt->name,
(int)name_rmt->namelen,
(int)name_rmt->valuelen, cursor);
}
if (retval)
break;
}
return(retval);
}
#define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
(((struct attrlist_ent *) 0)->a_name - (char *) 0)
#define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
& ~(sizeof(u_int32_t)-1))
/*
* Format an attribute and copy it out the the user's buffer.
*/
/*ARGSUSED*/
int
xfs_attr_put_listent(attrlist_t *alist, char *name, int namelen, int valuelen,
attrlist_cursor_kern_t *cursor)
{
attrlist_ent_t *aep;
int firstused, arraytop;
ASSERT(alist->al_count >= 0);
ASSERT(alist->al_count < (ATTR_MAX_VALUELEN/8));
if (alist->al_count == 0) {
firstused = alist->al_offset[ 0 ];
} else {
firstused = alist->al_offset[ alist->al_count-1 ];
}
ASSERT(firstused > sizeof(*alist));
ASSERT(firstused <= alist->al_offset[0]);
arraytop = sizeof(*alist) +
(alist->al_count-1) * sizeof(alist->al_offset[0]);
ASSERT(arraytop > 0);
ASSERT(arraytop <= firstused);
firstused -= ATTR_ENTSIZE(namelen);
if (firstused <= arraytop) {
alist->al_more = 1;
return(1);
}
ASSERT(firstused > 0);
aep = (attrlist_ent_t *)&(((char *)alist)[firstused]);
aep->a_valuelen = valuelen;
bcopy(name, aep->a_name, namelen);
aep->a_name[ namelen ] = 0;
alist->al_offset[ alist->al_count++ ] = firstused;
return(0);
}
/*
* Clear the INCOMPLETE flag on an entry in a leaf block.
*/
int
xfs_attr_leaf_clearflag(xfs_da_args_t *args)
{
xfs_attr_leafblock_t *leaf;
xfs_attr_leaf_entry_t *entry;
xfs_trans_t *trans;
xfs_inode_t *dp;
buf_t *bp;
int error;
/*
* Set up the transaction envelope.
*/
dp = args->dp;
trans = xfs_trans_alloc(dp->i_mount, XFS_TRANS_MKDIR);
if (error = xfs_trans_reserve(trans, 1,
/* GROT: make attr log_res macros */ XFS_MKDIR_LOG_RES(dp->i_mount),
0, XFS_TRANS_PERM_LOG_RES,
XFS_MKDIR_LOG_COUNT)) {
xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES);
return(error);
}
error = xfs_da_read_buf(trans, dp, args->aleaf_blkno, &bp,
XFS_ATTR_FORK);
if (error)
return(error);
ASSERT(bp != NULL);
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
ASSERT(leaf->hdr.info.magic == XFS_ATTR_LEAF_MAGIC);
ASSERT(args->aleaf_index < leaf->hdr.count);
ASSERT(args->aleaf_index >= 0);
entry = &leaf->entries[ args->aleaf_index ];
entry->flags &= ~XFS_ATTR_INCOMPLETE;
xfs_trans_log_buf(trans, bp,
XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
return(error);
}
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