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ext2_extents.c
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ext2_extents.c
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2010 Zheng Liu <lz@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/endian.h>
#include <sys/conf.h>
#include <sys/sdt.h>
#include <sys/stat.h>
#include <fs/ext2fs/ext2_mount.h>
#include <fs/ext2fs/fs.h>
#include <fs/ext2fs/inode.h>
#include <fs/ext2fs/ext2fs.h>
#include <fs/ext2fs/ext2_extents.h>
#include <fs/ext2fs/ext2_extern.h>
SDT_PROVIDER_DECLARE(ext2fs);
/*
* ext2fs trace probe:
* arg0: verbosity. Higher numbers give more verbose messages
* arg1: Textual message
*/
SDT_PROBE_DEFINE2(ext2fs, , trace, extents, "int", "char*");
static MALLOC_DEFINE(M_EXT2EXTENTS, "ext2_extents", "EXT2 extents");
#ifdef EXT2FS_PRINT_EXTENTS
static const bool print_extents_walk = true;
static int ext4_ext_check_header(struct inode *, struct ext4_extent_header *);
static int ext4_ext_walk_header(struct inode *, struct ext4_extent_header *);
static inline e4fs_daddr_t ext4_ext_index_pblock(struct ext4_extent_index *);
static inline e4fs_daddr_t ext4_ext_extent_pblock(struct ext4_extent *);
static int
ext4_ext_blk_check(struct inode *ip, e4fs_daddr_t blk)
{
struct m_ext2fs *fs;
fs = ip->i_e2fs;
if (blk < fs->e2fs->e2fs_first_dblock || blk >= fs->e2fs_bcount)
return (EIO);
return (0);
}
static int
ext4_ext_walk_index(struct inode *ip, struct ext4_extent_index *ex, bool do_walk)
{
struct m_ext2fs *fs;
struct buf *bp;
e4fs_daddr_t blk;
int error;
fs = ip->i_e2fs;
if (print_extents_walk)
printf(" index %p => (blk %u pblk %ju)\n", ex,
le32toh(ex->ei_blk), (uint64_t)le16toh(ex->ei_leaf_hi) << 32 |
le32toh(ex->ei_leaf_lo));
if(!do_walk)
return (0);
blk = ext4_ext_index_pblock(ex);
error = ext4_ext_blk_check(ip, blk);
if (error)
return (error);
if ((error = bread(ip->i_devvp,
fsbtodb(fs, blk), (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
brelse(bp);
return (error);
}
error = ext4_ext_walk_header(ip, (struct ext4_extent_header *)bp->b_data);
brelse(bp);
return (error);
}
static int
ext4_ext_walk_extent(struct inode *ip, struct ext4_extent *ep)
{
e4fs_daddr_t blk;
int error;
blk = ext4_ext_extent_pblock(ep);
error = ext4_ext_blk_check(ip, blk);
if (error)
return (error);
if (print_extents_walk)
printf(" ext %p => (blk %u len %u start %ju)\n",
ep, le32toh(ep->e_blk), le16toh(ep->e_len),
(uint64_t)blk);
return (0);
}
static int
ext4_ext_walk_header(struct inode *ip, struct ext4_extent_header *eh)
{
int i, error = 0;
error = ext4_ext_check_header(ip, eh);
if (error)
return (error);
if (print_extents_walk)
printf("header %p => (entries %d max %d depth %d gen %d)\n",
eh, le16toh(eh->eh_ecount),
le16toh(eh->eh_max), le16toh(eh->eh_depth), le32toh(eh->eh_gen));
for (i = 0; i < le16toh(eh->eh_ecount) && error == 0; i++)
if (eh->eh_depth != 0)
error = ext4_ext_walk_index(ip,
(struct ext4_extent_index *)(eh + 1 + i), true);
else
error = ext4_ext_walk_extent(ip, (struct ext4_extent *)(eh + 1 + i));
return (error);
}
static int
ext4_ext_print_path(struct inode *ip, struct ext4_extent_path *path)
{
int k, l, error = 0;
l = path->ep_depth;
if (print_extents_walk)
printf("ip=%ju, Path:\n", ip->i_number);
for (k = 0; k <= l && error == 0; k++, path++) {
if (path->ep_index) {
error = ext4_ext_walk_index(ip, path->ep_index, false);
} else if (path->ep_ext) {
error = ext4_ext_walk_extent(ip, path->ep_ext);
}
}
return (error);
}
int
ext4_ext_walk(struct inode *ip)
{
struct ext4_extent_header *ehp;
ehp = (struct ext4_extent_header *)ip->i_db;
if (print_extents_walk)
printf("Extent status:ip=%ju\n", ip->i_number);
if (!(ip->i_flag & IN_E4EXTENTS))
return (0);
return (ext4_ext_walk_header(ip, ehp));
}
#endif
static inline struct ext4_extent_header *
ext4_ext_inode_header(struct inode *ip)
{
return ((struct ext4_extent_header *)ip->i_db);
}
static inline struct ext4_extent_header *
ext4_ext_block_header(char *bdata)
{
return ((struct ext4_extent_header *)bdata);
}
static inline unsigned short
ext4_ext_inode_depth(struct inode *ip)
{
struct ext4_extent_header *ehp;
ehp = (struct ext4_extent_header *)ip->i_data;
return (le16toh(ehp->eh_depth));
}
static inline e4fs_daddr_t
ext4_ext_index_pblock(struct ext4_extent_index *index)
{
e4fs_daddr_t blk;
blk = le32toh(index->ei_leaf_lo);
blk |= (e4fs_daddr_t)le16toh(index->ei_leaf_hi) << 32;
return (blk);
}
static inline void
ext4_index_store_pblock(struct ext4_extent_index *index, e4fs_daddr_t pb)
{
index->ei_leaf_lo = htole32(pb & 0xffffffff);
index->ei_leaf_hi = htole16((pb >> 32) & 0xffff);
}
static inline e4fs_daddr_t
ext4_ext_extent_pblock(struct ext4_extent *extent)
{
e4fs_daddr_t blk;
blk = le32toh(extent->e_start_lo);
blk |= (e4fs_daddr_t)le16toh(extent->e_start_hi) << 32;
return (blk);
}
static inline void
ext4_ext_store_pblock(struct ext4_extent *ex, e4fs_daddr_t pb)
{
ex->e_start_lo = htole32(pb & 0xffffffff);
ex->e_start_hi = htole16((pb >> 32) & 0xffff);
}
int
ext4_ext_in_cache(struct inode *ip, daddr_t lbn, struct ext4_extent *ep)
{
struct ext4_extent_cache *ecp;
int ret = EXT4_EXT_CACHE_NO;
ecp = &ip->i_ext_cache;
if (ecp->ec_type == EXT4_EXT_CACHE_NO)
return (ret);
if (lbn >= ecp->ec_blk && lbn < ecp->ec_blk + ecp->ec_len) {
ep->e_blk = htole32(ecp->ec_blk);
ep->e_start_lo = htole32(ecp->ec_start & 0xffffffff);
ep->e_start_hi = htole16(ecp->ec_start >> 32 & 0xffff);
ep->e_len = htole16(ecp->ec_len);
ret = ecp->ec_type;
}
return (ret);
}
static int
ext4_ext_check_header(struct inode *ip, struct ext4_extent_header *eh)
{
struct m_ext2fs *fs;
char *error_msg;
fs = ip->i_e2fs;
if (le16toh(eh->eh_magic) != EXT4_EXT_MAGIC) {
error_msg = "header: invalid magic";
goto corrupted;
}
if (eh->eh_max == 0) {
error_msg = "header: invalid eh_max";
goto corrupted;
}
if (le16toh(eh->eh_ecount) > le16toh(eh->eh_max)) {
error_msg = "header: invalid eh_entries";
goto corrupted;
}
return (0);
corrupted:
SDT_PROBE2(ext2fs, , trace, extents, 1, error_msg);
return (EIO);
}
static void
ext4_ext_binsearch_index(struct ext4_extent_path *path, int blk)
{
struct ext4_extent_header *eh;
struct ext4_extent_index *r, *l, *m;
eh = path->ep_header;
KASSERT(le16toh(eh->eh_ecount) <= le16toh(eh->eh_max) &&
le16toh(eh->eh_ecount) > 0,
("ext4_ext_binsearch_index: bad args"));
l = EXT_FIRST_INDEX(eh) + 1;
r = EXT_FIRST_INDEX(eh) + le16toh(eh->eh_ecount) - 1;
while (l <= r) {
m = l + (r - l) / 2;
if (blk < le32toh(m->ei_blk))
r = m - 1;
else
l = m + 1;
}
path->ep_index = l - 1;
}
static void
ext4_ext_binsearch_ext(struct ext4_extent_path *path, int blk)
{
struct ext4_extent_header *eh;
struct ext4_extent *r, *l, *m;
eh = path->ep_header;
KASSERT(le16toh(eh->eh_ecount) <= le16toh(eh->eh_max),
("ext4_ext_binsearch_ext: bad args"));
if (eh->eh_ecount == 0)
return;
l = EXT_FIRST_EXTENT(eh) + 1;
r = EXT_FIRST_EXTENT(eh) + le16toh(eh->eh_ecount) - 1;
while (l <= r) {
m = l + (r - l) / 2;
if (blk < le32toh(m->e_blk))
r = m - 1;
else
l = m + 1;
}
path->ep_ext = l - 1;
}
static int
ext4_ext_fill_path_bdata(struct ext4_extent_path *path,
struct buf *bp, uint64_t blk)
{
KASSERT(path->ep_data == NULL,
("ext4_ext_fill_path_bdata: bad ep_data"));
path->ep_data = malloc(bp->b_bufsize, M_EXT2EXTENTS, M_WAITOK);
memcpy(path->ep_data, bp->b_data, bp->b_bufsize);
path->ep_blk = blk;
return (0);
}
static void
ext4_ext_fill_path_buf(struct ext4_extent_path *path, struct buf *bp)
{
KASSERT(path->ep_data != NULL,
("ext4_ext_fill_path_buf: bad ep_data"));
memcpy(bp->b_data, path->ep_data, bp->b_bufsize);
}
static void
ext4_ext_drop_refs(struct ext4_extent_path *path)
{
int depth, i;
if (!path)
return;
depth = path->ep_depth;
for (i = 0; i <= depth; i++, path++)
if (path->ep_data) {
free(path->ep_data, M_EXT2EXTENTS);
path->ep_data = NULL;
}
}
void
ext4_ext_path_free(struct ext4_extent_path *path)
{
if (!path)
return;
ext4_ext_drop_refs(path);
free(path, M_EXT2EXTENTS);
}
int
ext4_ext_find_extent(struct inode *ip, daddr_t block,
struct ext4_extent_path **ppath)
{
struct m_ext2fs *fs;
struct ext4_extent_header *eh;
struct ext4_extent_path *path;
struct buf *bp;
uint64_t blk;
int error, depth, i, ppos, alloc;
fs = ip->i_e2fs;
eh = ext4_ext_inode_header(ip);
depth = ext4_ext_inode_depth(ip);
ppos = 0;
alloc = 0;
error = ext4_ext_check_header(ip, eh);
if (error)
return (error);
if (ppath == NULL)
return (EINVAL);
path = *ppath;
if (path == NULL) {
path = malloc(EXT4_EXT_DEPTH_MAX *
sizeof(struct ext4_extent_path),
M_EXT2EXTENTS, M_WAITOK | M_ZERO);
*ppath = path;
alloc = 1;
}
path[0].ep_header = eh;
path[0].ep_data = NULL;
/* Walk through the tree. */
i = depth;
while (i) {
ext4_ext_binsearch_index(&path[ppos], block);
blk = ext4_ext_index_pblock(path[ppos].ep_index);
path[ppos].ep_depth = i;
path[ppos].ep_ext = NULL;
error = bread(ip->i_devvp, fsbtodb(ip->i_e2fs, blk),
ip->i_e2fs->e2fs_bsize, NOCRED, &bp);
if (error) {
goto error;
}
ppos++;
if (ppos > depth) {
SDT_PROBE2(ext2fs, , trace, extents, 1,
"ppos > depth => extent corrupted");
error = EIO;
brelse(bp);
goto error;
}
ext4_ext_fill_path_bdata(&path[ppos], bp, blk);
bqrelse(bp);
eh = ext4_ext_block_header(path[ppos].ep_data);
if (ext4_ext_check_header(ip, eh) ||
ext2_extent_blk_csum_verify(ip, path[ppos].ep_data)) {
error = EIO;
goto error;
}
path[ppos].ep_header = eh;
i--;
}
error = ext4_ext_check_header(ip, eh);
if (error)
goto error;
/* Find extent. */
path[ppos].ep_depth = i;
path[ppos].ep_header = eh;
path[ppos].ep_ext = NULL;
path[ppos].ep_index = NULL;
ext4_ext_binsearch_ext(&path[ppos], block);
return (0);
error:
ext4_ext_drop_refs(path);
if (alloc)
free(path, M_EXT2EXTENTS);
*ppath = NULL;
return (error);
}
static inline int
ext4_ext_space_root(struct inode *ip)
{
int size;
size = sizeof(ip->i_data);
size -= sizeof(struct ext4_extent_header);
size /= sizeof(struct ext4_extent);
return (size);
}
static inline int
ext4_ext_space_block(struct inode *ip)
{
struct m_ext2fs *fs;
int size;
fs = ip->i_e2fs;
size = (fs->e2fs_bsize - sizeof(struct ext4_extent_header)) /
sizeof(struct ext4_extent);
return (size);
}
static inline int
ext4_ext_space_block_index(struct inode *ip)
{
struct m_ext2fs *fs;
int size;
fs = ip->i_e2fs;
size = (fs->e2fs_bsize - sizeof(struct ext4_extent_header)) /
sizeof(struct ext4_extent_index);
return (size);
}
void
ext4_ext_tree_init(struct inode *ip)
{
struct ext4_extent_header *ehp;
ip->i_flag |= IN_E4EXTENTS;
memset(ip->i_data, 0, EXT2_NDADDR + EXT2_NIADDR);
ehp = (struct ext4_extent_header *)ip->i_data;
ehp->eh_magic = htole16(EXT4_EXT_MAGIC);
ehp->eh_max = htole16(ext4_ext_space_root(ip));
ip->i_ext_cache.ec_type = EXT4_EXT_CACHE_NO;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
ext2_update(ip->i_vnode, 1);
}
static inline void
ext4_ext_put_in_cache(struct inode *ip, uint32_t blk,
uint32_t len, uint32_t start, int type)
{
KASSERT(len != 0, ("ext4_ext_put_in_cache: bad input"));
ip->i_ext_cache.ec_type = type;
ip->i_ext_cache.ec_blk = blk;
ip->i_ext_cache.ec_len = len;
ip->i_ext_cache.ec_start = start;
}
static e4fs_daddr_t
ext4_ext_blkpref(struct inode *ip, struct ext4_extent_path *path,
e4fs_daddr_t block)
{
struct m_ext2fs *fs;
struct ext4_extent *ex;
e4fs_daddr_t bg_start;
int depth;
fs = ip->i_e2fs;
if (path) {
depth = path->ep_depth;
ex = path[depth].ep_ext;
if (ex) {
e4fs_daddr_t pblk = ext4_ext_extent_pblock(ex);
e2fs_daddr_t blk = le32toh(ex->e_blk);
if (block > blk)
return (pblk + (block - blk));
else
return (pblk - (blk - block));
}
/* Try to get block from index itself. */
if (path[depth].ep_data)
return (path[depth].ep_blk);
}
/* Use inode's group. */
bg_start = (ip->i_block_group * EXT2_BLOCKS_PER_GROUP(ip->i_e2fs)) +
le32toh(fs->e2fs->e2fs_first_dblock);
return (bg_start + block);
}
static int inline
ext4_can_extents_be_merged(struct ext4_extent *ex1,
struct ext4_extent *ex2)
{
if (le32toh(ex1->e_blk) + le16toh(ex1->e_len) != le32toh(ex2->e_blk))
return (0);
if (le16toh(ex1->e_len) + le16toh(ex2->e_len) > EXT4_MAX_LEN)
return (0);
if (ext4_ext_extent_pblock(ex1) + le16toh(ex1->e_len) ==
ext4_ext_extent_pblock(ex2))
return (1);
return (0);
}
static unsigned
ext4_ext_next_leaf_block(struct inode *ip, struct ext4_extent_path *path)
{
int depth = path->ep_depth;
/* Empty tree */
if (depth == 0)
return (EXT4_MAX_BLOCKS);
/* Go to indexes. */
depth--;
while (depth >= 0) {
if (path[depth].ep_index !=
EXT_LAST_INDEX(path[depth].ep_header))
return (le32toh(path[depth].ep_index[1].ei_blk));
depth--;
}
return (EXT4_MAX_BLOCKS);
}
static int
ext4_ext_dirty(struct inode *ip, struct ext4_extent_path *path)
{
struct m_ext2fs *fs;
struct buf *bp;
uint64_t blk;
int error;
fs = ip->i_e2fs;
if (!path)
return (EINVAL);
if (path->ep_data) {
blk = path->ep_blk;
bp = getblk(ip->i_devvp, fsbtodb(fs, blk),
fs->e2fs_bsize, 0, 0, 0);
if (!bp)
return (EIO);
ext4_ext_fill_path_buf(path, bp);
ext2_extent_blk_csum_set(ip, bp->b_data);
error = bwrite(bp);
} else {
ip->i_flag |= IN_CHANGE | IN_UPDATE;
error = ext2_update(ip->i_vnode, 1);
}
return (error);
}
static int
ext4_ext_insert_index(struct inode *ip, struct ext4_extent_path *path,
uint32_t lblk, e4fs_daddr_t blk)
{
struct m_ext2fs *fs;
struct ext4_extent_index *idx;
int len;
fs = ip->i_e2fs;
if (lblk == le32toh(path->ep_index->ei_blk)) {
SDT_PROBE2(ext2fs, , trace, extents, 1,
"lblk == index blk => extent corrupted");
return (EIO);
}
if (le16toh(path->ep_header->eh_ecount) >=
le16toh(path->ep_header->eh_max)) {
SDT_PROBE2(ext2fs, , trace, extents, 1,
"ecout > maxcount => extent corrupted");
return (EIO);
}
if (lblk > le32toh(path->ep_index->ei_blk)) {
/* Insert after. */
idx = path->ep_index + 1;
} else {
/* Insert before. */
idx = path->ep_index;
}
len = EXT_LAST_INDEX(path->ep_header) - idx + 1;
if (len > 0)
memmove(idx + 1, idx, len * sizeof(struct ext4_extent_index));
if (idx > EXT_MAX_INDEX(path->ep_header)) {
SDT_PROBE2(ext2fs, , trace, extents, 1,
"index is out of range => extent corrupted");
return (EIO);
}
idx->ei_blk = htole32(lblk);
ext4_index_store_pblock(idx, blk);
path->ep_header->eh_ecount =
htole16(le16toh(path->ep_header->eh_ecount) + 1);
return (ext4_ext_dirty(ip, path));
}
static e4fs_daddr_t
ext4_ext_alloc_meta(struct inode *ip)
{
e4fs_daddr_t blk = ext2_alloc_meta(ip);
if (blk) {
ip->i_blocks += btodb(ip->i_e2fs->e2fs_bsize);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
ext2_update(ip->i_vnode, 1);
}
return (blk);
}
static void
ext4_ext_blkfree(struct inode *ip, uint64_t blk, int count, int flags)
{
struct m_ext2fs *fs;
int i, blocksreleased;
fs = ip->i_e2fs;
blocksreleased = count;
for(i = 0; i < count; i++)
ext2_blkfree(ip, blk + i, fs->e2fs_bsize);
if (ip->i_blocks >= blocksreleased)
ip->i_blocks -= (btodb(fs->e2fs_bsize)*blocksreleased);
else
ip->i_blocks = 0;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
ext2_update(ip->i_vnode, 1);
}
static int
ext4_ext_split(struct inode *ip, struct ext4_extent_path *path,
struct ext4_extent *newext, int at)
{
struct m_ext2fs *fs;
struct buf *bp;
int depth = ext4_ext_inode_depth(ip);
struct ext4_extent_header *neh;
struct ext4_extent_index *fidx;
struct ext4_extent *ex;
int i = at, k, m, a;
e4fs_daddr_t newblk, oldblk;
uint32_t border;
e4fs_daddr_t *ablks = NULL;
int error = 0;
fs = ip->i_e2fs;
bp = NULL;
/*
* We will split at current extent for now.
*/
if (path[depth].ep_ext > EXT_MAX_EXTENT(path[depth].ep_header)) {
SDT_PROBE2(ext2fs, , trace, extents, 1,
"extent is out of range => extent corrupted");
return (EIO);
}
if (path[depth].ep_ext != EXT_MAX_EXTENT(path[depth].ep_header))
border = le32toh(path[depth].ep_ext[1].e_blk);
else
border = le32toh(newext->e_blk);
/* Allocate new blocks. */
ablks = malloc(sizeof(e4fs_daddr_t) * depth,
M_EXT2EXTENTS, M_WAITOK | M_ZERO);
for (a = 0; a < depth - at; a++) {
newblk = ext4_ext_alloc_meta(ip);
if (newblk == 0)
goto cleanup;
ablks[a] = newblk;
}
newblk = ablks[--a];
bp = getblk(ip->i_devvp, fsbtodb(fs, newblk), fs->e2fs_bsize, 0, 0, 0);
if (!bp) {
error = EIO;
goto cleanup;
}
neh = ext4_ext_block_header(bp->b_data);
neh->eh_ecount = 0;
neh->eh_max = le16toh(ext4_ext_space_block(ip));
neh->eh_magic = le16toh(EXT4_EXT_MAGIC);
neh->eh_depth = 0;
ex = EXT_FIRST_EXTENT(neh);
if (le16toh(path[depth].ep_header->eh_ecount) !=
le16toh(path[depth].ep_header->eh_max)) {
SDT_PROBE2(ext2fs, , trace, extents, 1,
"extents count out of range => extent corrupted");
error = EIO;
goto cleanup;
}
/* Start copy from next extent. */
m = 0;
path[depth].ep_ext++;
while (path[depth].ep_ext <= EXT_MAX_EXTENT(path[depth].ep_header)) {
path[depth].ep_ext++;
m++;
}
if (m) {
memmove(ex, path[depth].ep_ext - m,
sizeof(struct ext4_extent) * m);
neh->eh_ecount = htole16(le16toh(neh->eh_ecount) + m);
}
ext2_extent_blk_csum_set(ip, bp->b_data);
bwrite(bp);
bp = NULL;
/* Fix old leaf. */
if (m) {
path[depth].ep_header->eh_ecount =
htole16(le16toh(path[depth].ep_header->eh_ecount) - m);
ext4_ext_dirty(ip, path + depth);
}
/* Create intermediate indexes. */
k = depth - at - 1;
KASSERT(k >= 0, ("ext4_ext_split: negative k"));
/* Insert new index into current index block. */
i = depth - 1;
while (k--) {
oldblk = newblk;
newblk = ablks[--a];
error = bread(ip->i_devvp, fsbtodb(fs, newblk),
(int)fs->e2fs_bsize, NOCRED, &bp);
if (error) {
goto cleanup;
}
neh = (struct ext4_extent_header *)bp->b_data;
neh->eh_ecount = htole16(1);
neh->eh_magic = htole16(EXT4_EXT_MAGIC);
neh->eh_max = htole16(ext4_ext_space_block_index(ip));
neh->eh_depth = htole16(depth - i);
fidx = EXT_FIRST_INDEX(neh);
fidx->ei_blk = htole32(border);
ext4_index_store_pblock(fidx, oldblk);
m = 0;
path[i].ep_index++;
while (path[i].ep_index <= EXT_MAX_INDEX(path[i].ep_header)) {
path[i].ep_index++;
m++;
}
if (m) {
memmove(++fidx, path[i].ep_index - m,
sizeof(struct ext4_extent_index) * m);
neh->eh_ecount = htole16(le16toh(neh->eh_ecount) + m);
}
ext2_extent_blk_csum_set(ip, bp->b_data);
bwrite(bp);
bp = NULL;
/* Fix old index. */
if (m) {
path[i].ep_header->eh_ecount =
htole16(le16toh(path[i].ep_header->eh_ecount) - m);
ext4_ext_dirty(ip, path + i);
}
i--;
}
error = ext4_ext_insert_index(ip, path + at, border, newblk);
cleanup:
if (bp)
brelse(bp);
if (error) {
for (i = 0; i < depth; i++) {
if (!ablks[i])
continue;
ext4_ext_blkfree(ip, ablks[i], 1, 0);
}
}
free(ablks, M_EXT2EXTENTS);
return (error);
}
static int
ext4_ext_grow_indepth(struct inode *ip, struct ext4_extent_path *path,
struct ext4_extent *newext)
{
struct m_ext2fs *fs;
struct ext4_extent_path *curpath;
struct ext4_extent_header *neh;
struct buf *bp;
e4fs_daddr_t newblk;
int error = 0;
fs = ip->i_e2fs;
curpath = path;
newblk = ext4_ext_alloc_meta(ip);
if (newblk == 0)
return (error);
bp = getblk(ip->i_devvp, fsbtodb(fs, newblk), fs->e2fs_bsize, 0, 0, 0);
if (!bp)
return (EIO);
/* Move top-level index/leaf into new block. */
memmove(bp->b_data, curpath->ep_header, sizeof(ip->i_data));
/* Set size of new block */
neh = ext4_ext_block_header(bp->b_data);
neh->eh_magic = htole16(EXT4_EXT_MAGIC);
if (ext4_ext_inode_depth(ip))
neh->eh_max = htole16(ext4_ext_space_block_index(ip));
else
neh->eh_max = htole16(ext4_ext_space_block(ip));
ext2_extent_blk_csum_set(ip, bp->b_data);
error = bwrite(bp);
if (error)
goto out;
bp = NULL;
curpath->ep_header->eh_magic = htole16(EXT4_EXT_MAGIC);
curpath->ep_header->eh_max = htole16(ext4_ext_space_root(ip));
curpath->ep_header->eh_ecount = htole16(1);
curpath->ep_index = EXT_FIRST_INDEX(curpath->ep_header);
curpath->ep_index->ei_blk = EXT_FIRST_EXTENT(path[0].ep_header)->e_blk;
ext4_index_store_pblock(curpath->ep_index, newblk);
neh = ext4_ext_inode_header(ip);
neh->eh_depth = htole16(path->ep_depth + 1);
ext4_ext_dirty(ip, curpath);
out:
brelse(bp);
return (error);
}
static int
ext4_ext_create_new_leaf(struct inode *ip, struct ext4_extent_path *path,
struct ext4_extent *newext)
{
struct ext4_extent_path *curpath;
int depth, i, error;
repeat:
i = depth = ext4_ext_inode_depth(ip);
/* Look for free index entry int the tree */
curpath = path + depth;
while (i > 0 && !EXT_HAS_FREE_INDEX(curpath)) {
i--;
curpath--;
}
/*