--- /dev/null
+/*
+ * extent.c --- routines to implement extents support
+ *
+ * Copyright (C) 2007 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fsP.h"
+#include "e2image.h"
+#include "ss/ss.h"
+
+/*
+ * Definitions to be dropped in lib/ext2fs/ext2fs.h
+ */
+
+/*
+ * Private definitions
+ */
+
+struct extent_path {
+ char *buf;
+ int entries;
+ int max_entries;
+ int left;
+ int visit_num;
+ int flags;
+ blk64_t end_blk;
+ void *curr;
+};
+
+
+struct ext2_extent_handle {
+ errcode_t magic;
+ ext2_filsys fs;
+ ext2_ino_t ino;
+ struct ext2_inode *inode;
+ int type;
+ int level;
+ int max_depth;
+ struct extent_path *path;
+};
+
+struct ext2_extent_path {
+ errcode_t magic;
+ int leaf_height;
+ blk64_t lblk;
+};
+
+/*
+ * Useful Debugging stuff
+ */
+
+#ifdef DEBUG
+static void dbg_show_header(struct ext3_extent_header *eh)
+{
+ printf("header: magic=%x entries=%u max=%u depth=%u generation=%u\n",
+ eh->eh_magic, eh->eh_entries, eh->eh_max, eh->eh_depth,
+ eh->eh_generation);
+}
+
+static void dbg_show_index(struct ext3_extent_idx *ix)
+{
+ printf("index: block=%u leaf=%u leaf_hi=%u unused=%u\n",
+ ix->ei_block, ix->ei_leaf, ix->ei_leaf_hi, ix->ei_unused);
+}
+
+static void dbg_show_extent(struct ext3_extent *ex)
+{
+ printf("extent: block=%u-%u len=%u start=%u start_hi=%u\n",
+ ex->ee_block, ex->ee_block + ex->ee_len - 1,
+ ex->ee_len, ex->ee_start, ex->ee_start_hi);
+}
+
+static void dbg_print_extent(char *desc, struct ext2fs_extent *extent)
+{
+ if (desc)
+ printf("%s: ", desc);
+ printf("extent: lblk %llu--%llu, len %lu, pblk %llu, flags: ",
+ extent->e_lblk, extent->e_lblk + extent->e_len - 1,
+ extent->e_len, extent->e_pblk);
+ if (extent->e_flags & EXT2_EXTENT_FLAGS_LEAF)
+ fputs("LEAF ", stdout);
+ if (extent->e_flags & EXT2_EXTENT_FLAGS_UNINIT)
+ fputs("UNINIT ", stdout);
+ if (extent->e_flags & EXT2_EXTENT_FLAGS_SECOND_VISIT)
+ fputs("2ND_VISIT ", stdout);
+ if (!extent->e_flags)
+ fputs("(none)", stdout);
+ fputc('\n', stdout);
+
+}
+
+#define dbg_printf(fmt, args...) printf(fmt, ## args)
+#else
+#define dbg_show_header(eh) do { } while (0)
+#define dbg_show_index(ix) do { } while (0)
+#define dbg_show_extent(ex) do { } while (0)
+#define dbg_print_extent(desc, ex) do { } while (0)
+#define dbg_printf(fmt, args...) do { } while (0)
+#endif
+
+/*
+ * Verify the extent header as being sane
+ */
+errcode_t ext2fs_extent_header_verify(void *ptr, int size)
+{
+ int eh_max, entry_size;
+ struct ext3_extent_header *eh = ptr;
+
+ dbg_show_header(eh);
+ if (ext2fs_le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC)
+ return EXT2_ET_EXTENT_HEADER_BAD;
+ if (ext2fs_le16_to_cpu(eh->eh_entries) > ext2fs_le16_to_cpu(eh->eh_max))
+ return EXT2_ET_EXTENT_HEADER_BAD;
+ if (eh->eh_depth == 0)
+ entry_size = sizeof(struct ext3_extent);
+ else
+ entry_size = sizeof(struct ext3_extent_idx);
+
+ eh_max = (size - sizeof(*eh)) / entry_size;
+ /* Allow two extent-sized items at the end of the block, for
+ * ext4_extent_tail with checksum in the future. */
+ if ((ext2fs_le16_to_cpu(eh->eh_max) > eh_max) ||
+ (ext2fs_le16_to_cpu(eh->eh_max) < (eh_max - 2)))
+ return EXT2_ET_EXTENT_HEADER_BAD;
+
+ return 0;
+}
+
+
+/*
+ * Begin functions to handle an inode's extent information
+ */
+
+extern void ext2fs_extent_free(ext2_extent_handle_t handle)
+{
+ int i;
+
+ if (!handle)
+ return;
+
+ if (handle->inode)
+ ext2fs_free_mem(&handle->inode);
+ if (handle->path) {
+ for (i=1; i < handle->max_depth; i++) {
+ if (handle->path[i].buf)
+ ext2fs_free_mem(&handle->path[i].buf);
+ }
+ }
+ ext2fs_free_mem(&handle);
+}
+
+extern errcode_t ext2fs_extent_open(ext2_filsys fs, ext2_ino_t ino,
+ ext2_extent_handle_t *ret_handle)
+{
+ struct ext2_extent_handle *handle;
+ errcode_t retval;
+ int isize = EXT2_INODE_SIZE(fs->super);
+ struct ext3_extent_header *eh;
+ struct ext3_extent_idx *ix;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ if ((ino == 0) || (ino > fs->super->s_inodes_count))
+ return EXT2_ET_BAD_INODE_NUM;
+
+ retval = ext2fs_get_mem(sizeof(struct ext2_extent_handle), &handle);
+ if (retval)
+ return retval;
+ memset(handle, 0, sizeof(struct ext2_extent_handle));
+
+ retval = ext2fs_get_mem(isize, &handle->inode);
+ if (retval)
+ goto errout;
+
+ handle->ino = ino;
+ handle->fs = fs;
+
+ retval = ext2fs_read_inode_full(fs, ino, handle->inode, isize);
+ if (retval)
+ goto errout;
+
+ if (!(handle->inode->i_flags & EXT4_EXTENTS_FL))
+ return EXT2_ET_INODE_NOT_EXTENT;
+
+ eh = (struct ext3_extent_header *) &handle->inode->i_block;
+
+ retval = ext2fs_extent_header_verify(eh, sizeof(handle->inode->i_block));
+ if (retval)
+ return (retval);
+
+ handle->max_depth = ext2fs_le16_to_cpu(eh->eh_depth);
+ handle->type = ext2fs_le16_to_cpu(eh->eh_magic);
+
+ retval = ext2fs_get_mem(((handle->max_depth+1) *
+ sizeof(struct extent_path)),
+ &handle->path);
+ memset(handle->path, 0,
+ (handle->max_depth+1) * sizeof(struct extent_path));
+ handle->path[0].buf = (char *) handle->inode->i_block;
+
+ handle->path[0].left = handle->path[0].entries =
+ ext2fs_le16_to_cpu(eh->eh_entries);
+ handle->path[0].max_entries = ext2fs_le16_to_cpu(eh->eh_max);
+ handle->path[0].curr = 0;
+ handle->path[0].end_blk =
+ ((((__u64) handle->inode->i_size_high << 32) +
+ handle->inode->i_size + (fs->blocksize - 1))
+ >> EXT2_BLOCK_SIZE_BITS(fs->super));
+ handle->path[0].visit_num = 1;
+ handle->level = 0;
+ handle->magic = EXT2_ET_MAGIC_EXTENT_HANDLE;
+
+ *ret_handle = handle;
+ return 0;
+
+errout:
+ ext2fs_extent_free(handle);
+ return retval;
+}
+
+/*
+ * This function is responsible for (optionally) moving through the
+ * extent tree and then returning the current extent
+ */
+errcode_t ext2fs_extent_get(ext2_extent_handle_t handle,
+ int flags, struct ext2fs_extent *extent)
+{
+ struct extent_path *path, *newpath;
+ struct ext3_extent_header *eh;
+ struct ext3_extent_idx *ix = 0;
+ struct ext3_extent *ex;
+ errcode_t retval;
+ blk_t blk;
+ blk64_t end_blk;
+ int orig_op, op;
+
+ EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
+
+ if (!handle->path)
+ return EXT2_ET_NO_CURRENT_NODE;
+
+ orig_op = op = flags & EXT2_EXTENT_MOVE_MASK;
+
+retry:
+ path = handle->path + handle->level;
+ if ((orig_op == EXT2_EXTENT_NEXT) ||
+ (orig_op == EXT2_EXTENT_NEXT_LEAF)) {
+ if (handle->level < handle->max_depth) {
+ /* interior node */
+ if (path->visit_num == 0) {
+ path->visit_num++;
+ op = EXT2_EXTENT_DOWN;
+ } else if (path->left > 0)
+ op = EXT2_EXTENT_NEXT_SIB;
+ else if (handle->level > 0)
+ op = EXT2_EXTENT_UP;
+ else
+ return EXT2_ET_EXTENT_NO_NEXT;
+ } else {
+ /* leaf node */
+ if (path->left > 0)
+ op = EXT2_EXTENT_NEXT_SIB;
+ else if (handle->level > 0)
+ op = EXT2_EXTENT_UP;
+ else
+ return EXT2_ET_EXTENT_NO_NEXT;
+ }
+ if (op != EXT2_EXTENT_NEXT_SIB) {
+ dbg_printf("<<<< OP = %s\n",
+ (op == EXT2_EXTENT_DOWN) ? "down" :
+ ((op == EXT2_EXTENT_UP) ? "up" : "unknown"));
+ }
+ }
+
+ if ((orig_op == EXT2_EXTENT_PREV) ||
+ (orig_op == EXT2_EXTENT_PREV_LEAF)) {
+ if (handle->level < handle->max_depth) {
+ /* interior node */
+ if (path->visit_num > 0 ) {
+ /* path->visit_num = 0; */
+ op = EXT2_EXTENT_DOWN_AND_LAST;
+ } else if (path->left < path->entries-1)
+ op = EXT2_EXTENT_PREV_SIB;
+ else if (handle->level > 0)
+ op = EXT2_EXTENT_UP;
+ else
+ return EXT2_ET_EXTENT_NO_PREV;
+ } else {
+ /* leaf node */
+ if (path->left < path->entries-1)
+ op = EXT2_EXTENT_PREV_SIB;
+ else if (handle->level > 0)
+ op = EXT2_EXTENT_UP;
+ else
+ return EXT2_ET_EXTENT_NO_PREV;
+ }
+ if (op != EXT2_EXTENT_PREV_SIB) {
+ dbg_printf("<<<< OP = %s\n",
+ (op == EXT2_EXTENT_DOWN_AND_LAST) ? "down/last" :
+ ((op == EXT2_EXTENT_UP) ? "up" : "unknown"));
+ }
+ }
+
+ if (orig_op == EXT2_EXTENT_LAST_LEAF) {
+ if ((handle->level < handle->max_depth) &&
+ (path->left == 0))
+ op = EXT2_EXTENT_DOWN;
+ else
+ op = EXT2_EXTENT_LAST_SIB;
+ dbg_printf("<<<< OP = %s\n",
+ (op == EXT2_EXTENT_DOWN) ? "down" : "last_sib");
+ }
+
+ switch (op) {
+ case EXT2_EXTENT_CURRENT:
+ ix = path->curr;
+ break;
+ case EXT2_EXTENT_ROOT:
+ handle->level = 0;
+ path = handle->path + handle->level;
+ case EXT2_EXTENT_FIRST_SIB:
+ path->left = path->entries;
+ path->curr = 0;
+ case EXT2_EXTENT_NEXT_SIB:
+ if (path->left <= 0)
+ return EXT2_ET_EXTENT_NO_NEXT;
+ if (path->curr) {
+ ix = path->curr;
+ ix++;
+ } else {
+ eh = (struct ext3_extent_header *) path->buf;
+ ix = EXT_FIRST_INDEX(eh);
+ }
+ path->left--;
+ path->curr = ix;
+ path->visit_num = 0;
+ break;
+ case EXT2_EXTENT_PREV_SIB:
+ if (!path->curr ||
+ path->left+1 >= path->entries)
+ return EXT2_ET_EXTENT_NO_PREV;
+ ix = path->curr;
+ ix--;
+ path->curr = ix;
+ path->left++;
+ if (handle->level < handle->max_depth)
+ path->visit_num = 1;
+ break;
+ case EXT2_EXTENT_LAST_SIB:
+ eh = (struct ext3_extent_header *) path->buf;
+ path->curr = EXT_LAST_EXTENT(eh);
+ ix = path->curr;
+ path->left = 0;
+ path->visit_num = 0;
+ break;
+ case EXT2_EXTENT_UP:
+ if (handle->level <= 0)
+ return EXT2_ET_EXTENT_NO_UP;
+ handle->level--;
+ path--;
+ ix = path->curr;
+ if ((orig_op == EXT2_EXTENT_PREV) ||
+ (orig_op == EXT2_EXTENT_PREV_LEAF))
+ path->visit_num = 0;
+ break;
+ case EXT2_EXTENT_DOWN:
+ case EXT2_EXTENT_DOWN_AND_LAST:
+ if (!path->curr ||(handle->level >= handle->max_depth))
+ return EXT2_ET_EXTENT_NO_DOWN;
+
+ ix = path->curr;
+ newpath = path + 1;
+ if (!newpath->buf) {
+ retval = ext2fs_get_mem(handle->fs->blocksize,
+ &newpath->buf);
+ if (retval)
+ return retval;
+ }
+ blk = ext2fs_le32_to_cpu(ix->ei_leaf) +
+ ((__u64) ext2fs_le16_to_cpu(ix->ei_leaf_hi));
+ if ((handle->fs->flags & EXT2_FLAG_IMAGE_FILE) &&
+ (handle->fs->io != handle->fs->image_io))
+ memset(newpath->buf, 0, handle->fs->blocksize);
+ else {
+ retval = io_channel_read_blk(handle->fs->io,
+ blk, 1, newpath->buf);
+ if (retval)
+ return retval;
+ }
+ handle->level++;
+
+ eh = (struct ext3_extent_header *) newpath->buf;
+
+ retval = ext2fs_extent_header_verify(eh, handle->fs->blocksize);
+ if (retval)
+ return retval;
+
+ newpath->left = newpath->entries =
+ ext2fs_le16_to_cpu(eh->eh_entries);
+ newpath->max_entries = ext2fs_le16_to_cpu(eh->eh_max);
+
+ if (path->left > 0) {
+ ix++;
+ newpath->end_blk = ext2fs_le32_to_cpu(ix->ei_block);
+ } else
+ newpath->end_blk = path->end_blk;
+
+ path = newpath;
+ if (op == EXT2_EXTENT_DOWN) {
+ ix = EXT_FIRST_INDEX((struct ext3_extent_header *) eh);
+ path->curr = ix;
+ path->left = path->entries - 1;
+ path->visit_num = 0;
+ } else {
+ ix = EXT_LAST_INDEX((struct ext3_extent_header *) eh);
+ path->curr = ix;
+ path->left = 0;
+ if (handle->level < handle->max_depth)
+ path->visit_num = 1;
+ }
+
+ dbg_printf("Down to level %d/%d, end_blk=%llu\n",
+ handle->level, handle->max_depth,
+ path->end_blk);
+
+ break;
+ default:
+ return EXT2_ET_OP_NOT_SUPPORTED;
+ }
+
+ if (!ix)
+ return EXT2_ET_NO_CURRENT_NODE;
+
+ extent->e_flags = 0;
+
+ if (handle->level == handle->max_depth) {
+ ex = (struct ext3_extent *) ix;
+
+ extent->e_pblk = ext2fs_le32_to_cpu(ex->ee_start) +
+ ((__u64) ext2fs_le16_to_cpu(ex->ee_start_hi) << 32);
+ extent->e_lblk = ext2fs_le32_to_cpu(ex->ee_block);
+ extent->e_len = ext2fs_le16_to_cpu(ex->ee_len);
+ extent->e_flags = EXT2_EXTENT_FLAGS_LEAF;
+ if (extent->e_len > EXT_INIT_MAX_LEN) {
+ extent->e_len -= EXT_INIT_MAX_LEN;
+ extent->e_flags = EXT2_EXTENT_FLAGS_UNINIT;
+ }
+ } else {
+ extent->e_pblk = ext2fs_le32_to_cpu(ix->ei_leaf) +
+ ((__u64) ext2fs_le16_to_cpu(ix->ei_leaf_hi) << 32);
+ extent->e_lblk = ext2fs_le32_to_cpu(ix->ei_block);
+ if (path->left > 0) {
+ ix++;
+ end_blk = ext2fs_le32_to_cpu(ix->ei_block);
+ } else
+ end_blk = path->end_blk;
+
+ extent->e_len = end_blk - extent->e_lblk;
+ }
+ if (path->visit_num)
+ extent->e_flags |= EXT2_EXTENT_FLAGS_SECOND_VISIT;
+
+ if (((orig_op == EXT2_EXTENT_NEXT_LEAF) ||
+ (orig_op == EXT2_EXTENT_PREV_LEAF)) &&
+ (handle->level != handle->max_depth))
+ goto retry;
+
+ if ((orig_op == EXT2_EXTENT_LAST_LEAF) &&
+ ((handle->level != handle->max_depth) ||
+ (path->left != 0)))
+ goto retry;
+
+ return 0;
+}
+
+static errcode_t update_path(ext2_extent_handle_t handle)
+{
+ struct extent_path *path;
+ blk64_t blk;
+ errcode_t retval;
+ struct ext3_extent_idx *ix;
+
+ if (handle->level == 0) {
+ retval = ext2fs_write_inode_full(handle->fs, handle->ino,
+ handle->inode, EXT2_INODE_SIZE(handle->fs->super));
+ } else {
+ ix = handle->path[handle->level - 1].curr;
+ blk = ext2fs_le32_to_cpu(ix->ei_leaf) +
+ ((__u64) ext2fs_le16_to_cpu(ix->ei_leaf_hi) << 32);
+
+ retval = io_channel_write_blk(handle->fs->io,
+ blk, 1, handle->path[handle->level].buf);
+ }
+ return retval;
+}
+
+errcode_t ext2fs_extent_save_path(ext2_extent_handle_t handle,
+ ext2_extent_path_t *ret_path)
+{
+ ext2_extent_path_t save_path;
+ struct ext2fs_extent extent;
+ struct ext2_extent_info info;
+ errcode_t retval;
+
+ retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
+ if (retval)
+ return retval;
+
+ retval = ext2fs_extent_get_info(handle, &info);
+ if (retval)
+ return retval;
+
+ retval = ext2fs_get_mem(sizeof(struct ext2_extent_path), &save_path);
+ if (retval)
+ return retval;
+ memset(save_path, 0, sizeof(struct ext2_extent_path));
+
+ save_path->magic = EXT2_ET_MAGIC_EXTENT_PATH;
+ save_path->leaf_height = info.max_depth - info.curr_level - 1;
+ save_path->lblk = extent.e_lblk;
+
+ *ret_path = save_path;
+ return 0;
+}
+
+errcode_t ext2fs_extent_free_path(ext2_extent_path_t path)
+{
+ EXT2_CHECK_MAGIC(path, EXT2_ET_MAGIC_EXTENT_PATH);
+
+ ext2fs_free_mem(&path);
+ return 0;
+}
+
+static errcode_t extent_goto(ext2_extent_handle_t handle,
+ int leaf_level, blk64_t blk)
+{
+ struct ext2fs_extent extent, next;
+ errcode_t retval;
+
+ retval = ext2fs_extent_get(handle, EXT2_EXTENT_ROOT, &extent);
+ if (retval)
+ return retval;
+
+ dbg_print_extent("root", &extent);
+ while (1) {
+ if (handle->level - leaf_level == handle->max_depth) {
+ if ((blk >= extent.e_lblk) &&
+ (blk < extent.e_lblk + extent.e_len))
+ return 0;
+ if (blk < extent.e_lblk)
+ return EXT2_ET_EXTENT_NOT_FOUND;
+ retval = ext2fs_extent_get(handle,
+ EXT2_EXTENT_NEXT_SIB,
+ &extent);
+ if (retval == EXT2_ET_EXTENT_NO_NEXT)
+ return EXT2_ET_EXTENT_NOT_FOUND;
+ if (retval)
+ return retval;
+ continue;
+ }
+
+ retval = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT_SIB,
+ &extent);
+ if (retval == EXT2_ET_EXTENT_NO_NEXT)
+ goto go_down;
+ if (retval)
+ return retval;
+
+ dbg_print_extent("next", &extent);
+ if (blk == extent.e_lblk)
+ goto go_down;
+ if (blk > extent.e_lblk)
+ continue;
+
+ retval = ext2fs_extent_get(handle, EXT2_EXTENT_PREV_SIB,
+ &extent);
+ if (retval)
+ return retval;
+
+ dbg_print_extent("prev", &extent);
+
+ go_down:
+ retval = ext2fs_extent_get(handle, EXT2_EXTENT_DOWN,
+ &extent);
+ if (retval)
+ return retval;
+
+ dbg_print_extent("down", &extent);
+ }
+}
+
+errcode_t ext2fs_extent_goto(ext2_extent_handle_t handle,
+ blk64_t blk)
+{
+ return extent_goto(handle, 0, blk);
+}
+
+errcode_t ext2fs_extent_replace(ext2_extent_handle_t handle, int flags,
+ struct ext2fs_extent *extent)
+{
+ struct extent_path *path;
+ struct ext3_extent_idx *ix;
+ struct ext3_extent *ex;
+
+ EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
+
+ if (!(handle->fs->flags & EXT2_FLAG_RW))
+ return EXT2_ET_RO_FILSYS;
+
+ if (!handle->path)
+ return EXT2_ET_NO_CURRENT_NODE;
+
+ path = handle->path + handle->level;
+ if (!path->curr)
+ return EXT2_ET_NO_CURRENT_NODE;
+
+ if (handle->level == handle->max_depth) {
+ ex = path->curr;
+
+ ex->ee_block = ext2fs_cpu_to_le32(extent->e_lblk);
+ ex->ee_start = ext2fs_cpu_to_le32(extent->e_pblk & 0xFFFFFFFF);
+ ex->ee_start_hi = ext2fs_cpu_to_le16(extent->e_pblk >> 32);
+ ex->ee_len = ext2fs_cpu_to_le16(extent->e_len);
+ } else {
+ ix = path->curr;
+
+ ix->ei_leaf = ext2fs_cpu_to_le32(extent->e_pblk & 0xFFFFFFFF);
+ ix->ei_leaf_hi = ext2fs_cpu_to_le16(extent->e_pblk >> 32);
+ ix->ei_block = ext2fs_cpu_to_le32(extent->e_lblk);
+ ix->ei_unused = 0;
+ }
+ update_path(handle);
+ return 0;
+}
+
+errcode_t ext2fs_extent_insert(ext2_extent_handle_t handle, int flags,
+ struct ext2fs_extent *extent)
+{
+ struct extent_path *path;
+ struct ext3_extent_idx *ix;
+ struct ext3_extent_header *eh;
+ errcode_t retval;
+
+ EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
+
+ if (!(handle->fs->flags & EXT2_FLAG_RW))
+ return EXT2_ET_RO_FILSYS;
+
+ if (!handle->path)
+ return EXT2_ET_NO_CURRENT_NODE;
+
+ path = handle->path + handle->level;
+
+ if (path->entries >= path->max_entries)
+ return EXT2_ET_CANT_INSERT_EXTENT;
+
+ eh = (struct ext3_extent_header *) path->buf;
+ if (path->curr) {
+ ix = path->curr;
+ if (flags & EXT2_EXTENT_INSERT_AFTER) {
+ ix++;
+ path->left--;
+ }
+ } else
+ ix = EXT_FIRST_INDEX(eh);
+
+ path->curr = ix;
+
+ if (path->left > 0)
+ memmove(ix + 1, ix,
+ path->left * sizeof(struct ext3_extent_idx));
+ path->left++;
+ path->entries++;
+
+ eh = (struct ext3_extent_header *) path->buf;
+ eh->eh_entries = ext2fs_cpu_to_le16(path->entries);
+
+ retval = ext2fs_extent_replace(handle, 0, extent);
+ if (retval)
+ goto errout;
+
+ retval = update_path(handle);
+ if (retval)
+ goto errout;
+
+ return 0;
+
+errout:
+ ext2fs_extent_delete(handle, 0);
+ return retval;
+}
+
+errcode_t ext2fs_extent_delete(ext2_extent_handle_t handle, int flags)
+{
+ struct extent_path *path;
+ char *cp;
+ struct ext3_extent_header *eh;
+ errcode_t retval;
+
+ EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
+
+ if (!(handle->fs->flags & EXT2_FLAG_RW))
+ return EXT2_ET_RO_FILSYS;
+
+ if (!handle->path)
+ return EXT2_ET_NO_CURRENT_NODE;
+
+ path = handle->path + handle->level;
+ if (!path->curr)
+ return EXT2_ET_NO_CURRENT_NODE;
+
+ cp = path->curr;
+
+ if (path->left) {
+ memmove(cp, cp + sizeof(struct ext3_extent_idx),
+ path->left * sizeof(struct ext3_extent_idx));
+ path->left--;
+ }
+ path->entries--;
+ if (path->entries == 0)
+ path->curr = 0;
+
+ eh = (struct ext3_extent_header *) path->buf;
+ eh->eh_entries = ext2fs_cpu_to_le16(path->entries);
+
+ retval = update_path(handle);
+
+ return retval;
+}
+
+errcode_t ext2fs_extent_get_info(ext2_extent_handle_t handle,
+ struct ext2_extent_info *info)
+{
+ struct extent_path *path;
+ struct ext3_extent_idx *ix;
+ struct ext3_extent *ex;
+
+ EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
+
+ memset(info, 0, sizeof(struct ext2_extent_info));
+
+ path = handle->path + handle->level;
+ if (path) {
+ if (path->curr)
+ info->curr_entry = ((char *) path->curr - path->buf) /
+ sizeof(struct ext3_extent_idx);
+ else
+ info->curr_entry = 0;
+ info->num_entries = path->entries;
+ info->max_entries = path->max_entries;
+ info->bytes_avail = (path->max_entries - path->entries) *
+ sizeof(struct ext3_extent);
+ }
+
+ info->curr_level = handle->level;
+ info->max_depth = handle->max_depth;
+ info->max_lblk = ((__u64) 1 << 32) - 1;
+ info->max_pblk = ((__u64) 1 << 48) - 1;
+ info->max_len = (1UL << 15);
+ info->max_uninit_len = (1UL << 15) - 1;
+
+ return 0;
+}
+
+#ifdef DEBUG
+
+#include "debugfs.h"
+
+/*
+ * Hook in new commands into debugfs
+ */
+char *debug_prog_name = "tst_extents";
+extern ss_request_table extent_cmds;
+ss_request_table *extra_cmds = &extent_cmds;
+
+ext2_ino_t current_ino = 0;
+ext2_extent_handle_t current_handle;
+
+void do_inode(int argc, char *argv[])
+{
+ ext2_ino_t inode;
+ int i;
+ struct ext3_extent_header *eh;
+ errcode_t retval;
+
+ if (check_fs_open(argv[0]))
+ return;
+
+ if (argc == 1) {
+ if (current_ino)
+ printf("Current inode is %d\n", current_ino);
+ else
+ printf("No current inode\n");
+ return;
+ }
+
+ if (common_inode_args_process(argc, argv, &inode, 0)) {
+ return;
+ }
+
+ current_ino = 0;
+
+ retval = ext2fs_extent_open(current_fs, inode, ¤t_handle);
+ if (retval) {
+ com_err(argv[1], retval, "while opening extent handle");
+ return;
+ }
+
+ current_ino = inode;
+
+ printf("Loaded inode %d\n", current_ino);
+
+ return;
+}
+
+void generic_goto_node(char *cmd_name, int op)
+{
+ struct ext2fs_extent extent;
+ errcode_t retval;
+
+ if (check_fs_open(cmd_name))
+ return;
+
+ if (!current_handle) {
+ com_err(cmd_name, 0, "Extent handle not open");
+ return;
+ }
+
+ retval = ext2fs_extent_get(current_handle, op, &extent);
+ if (retval) {
+ com_err(cmd_name, retval, 0);
+ return;
+ }
+ dbg_print_extent(0, &extent);
+}
+
+void do_current_node(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_CURRENT);
+}
+
+void do_root_node(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_ROOT);
+}
+
+void do_last_leaf(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_LAST_LEAF);
+}
+
+void do_first_sib(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_FIRST_SIB);
+}
+
+void do_last_sib(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_LAST_SIB);
+}
+
+void do_next_sib(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_NEXT_SIB);
+}
+
+void do_prev_sib(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_PREV_SIB);
+}
+
+void do_next_leaf(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_NEXT_LEAF);
+}
+
+void do_prev_leaf(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_PREV_LEAF);
+}
+
+void do_next(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_NEXT);
+}
+
+void do_prev(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_PREV);
+}
+
+void do_up(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_UP);
+}
+
+void do_down(int argc, char *argv[])
+{
+ generic_goto_node(argv[0], EXT2_EXTENT_DOWN);
+}
+
+void do_delete_node(int argc, char *argv[])
+{
+ errcode_t retval;
+ int err;
+
+ if (check_fs_read_write(argv[0]))
+ return;
+
+ retval = ext2fs_extent_delete(current_handle, 0);
+ if (retval) {
+ com_err(argv[0], retval, 0);
+ return;
+ }
+ do_current_node(argc, argv);
+}
+
+void do_replace_node(int argc, char *argv[])
+{
+ errcode_t retval;
+ struct ext2fs_extent extent;
+ int err;
+
+ if (check_fs_read_write(argv[0]))
+ return;
+
+ if (argc != 4) {
+ fprintf(stderr, "usage: %s <lblk> <len> <pblk>\n", argv[0]);
+ return;
+ }
+
+ extent.e_lblk = parse_ulong(argv[1], argv[0],
+ "logical block", &err);
+ if (err)
+ return;
+
+ extent.e_len = parse_ulong(argv[2], argv[0],
+ "logical block", &err);
+ if (err)
+ return;
+
+ extent.e_pblk = parse_ulong(argv[3], argv[0],
+ "logical block", &err);
+ if (err)
+ return;
+
+ retval = ext2fs_extent_replace(current_handle, 0, &extent);
+ if (retval) {
+ com_err(argv[0], retval, 0);
+ return;
+ }
+ do_current_node(argc, argv);
+}
+
+void do_insert_node(int argc, char *argv[])
+{
+ errcode_t retval;
+ struct ext2fs_extent extent;
+ char *cmd;
+ int err;
+ int flags = 0;
+
+ if (check_fs_read_write(argv[0]))
+ return;
+
+ cmd = argv[0];
+
+ if (argc > 2 && !strcmp(argv[1], "--after")) {
+ argc--;
+ argv++;
+ flags |= EXT2_EXTENT_INSERT_AFTER;
+ }
+
+ if (argc != 4) {
+ fprintf(stderr, "usage: %s <lblk> <len> <pblk>\n", cmd);
+ return;
+ }
+
+ extent.e_lblk = parse_ulong(argv[1], cmd,
+ "logical block", &err);
+ if (err)
+ return;
+
+ extent.e_len = parse_ulong(argv[2], cmd,
+ "length", &err);
+ if (err)
+ return;
+
+ extent.e_pblk = parse_ulong(argv[3], cmd,
+ "pysical block", &err);
+ if (err)
+ return;
+
+ retval = ext2fs_extent_insert(current_handle, flags, &extent);
+ if (retval) {
+ com_err(cmd, retval, 0);
+ return;
+ }
+ do_current_node(argc, argv);
+}
+
+void do_print_all(int argc, char **argv)
+{
+ struct ext2fs_extent extent;
+ errcode_t retval;
+ errcode_t end_err = EXT2_ET_EXTENT_NO_NEXT;
+ int op = EXT2_EXTENT_NEXT;
+ int first_op = EXT2_EXTENT_ROOT;
+
+
+ if (check_fs_open(argv[0]))
+ return;
+
+ if (!current_handle) {
+ com_err(argv[0], 0, "Extent handle not open");
+ return;
+ }
+
+ if (argc > 2) {
+ print_usage:
+ fprintf(stderr,
+ "Usage: %s [--leaf-only|--reverse|--reverse-leaf]\n",
+ argv[0]);
+ return;
+ }
+
+ if (argc == 2) {
+ if (!strcmp(argv[1], "--leaf-only"))
+ op = EXT2_EXTENT_NEXT_LEAF;
+ else if (!strcmp(argv[1], "--reverse")) {
+ op = EXT2_EXTENT_PREV;
+ first_op = EXT2_EXTENT_LAST_LEAF;
+ end_err = EXT2_ET_EXTENT_NO_PREV;
+ } else if (!strcmp(argv[1], "--reverse-leaf")) {
+ op = EXT2_EXTENT_PREV_LEAF;
+ first_op = EXT2_EXTENT_LAST_LEAF;
+ end_err = EXT2_ET_EXTENT_NO_PREV;
+ } else
+ goto print_usage;
+ }
+
+ retval = ext2fs_extent_get(current_handle, first_op, &extent);
+ if (retval) {
+ com_err(argv[0], retval, 0);
+ return;
+ }
+ dbg_print_extent(0, &extent);
+
+ while (1) {
+ retval = ext2fs_extent_get(current_handle, op, &extent);
+ if (retval == end_err)
+ break;
+
+ if (retval) {
+ com_err(argv[0], retval, 0);
+ return;
+ }
+ dbg_print_extent(0, &extent);
+ }
+}
+
+void do_info(int argc, char **argv)
+{
+ struct ext2_extent_info info;
+ errcode_t retval;
+
+ if (check_fs_open(argv[0]))
+ return;
+
+ if (!current_handle) {
+ com_err(argv[0], 0, "Extent handle not open");
+ return;
+ }
+
+ retval = ext2fs_extent_get_info(current_handle, &info);
+ if (retval) {
+ com_err(argv[0], retval, 0);
+ return;
+ }
+
+ printf("Current handle location: %d/%d (max: %d, bytes %d), level %d/%d\n",
+ info.curr_entry, info.num_entries, info.max_entries,
+ info.bytes_avail, info.curr_level, info.max_depth);
+ printf("\tmax lblk: %llu, max pblk: %llu\n", info.max_lblk,
+ info.max_pblk);
+ printf("\tmax_len: %u, max_uninit_len: %u\n", info.max_len,
+ info.max_uninit_len);
+}
+
+void do_goto_block(int argc, char **argv)
+{
+ struct ext2fs_extent extent;
+ errcode_t retval;
+ int op = EXT2_EXTENT_NEXT_LEAF;
+ blk_t blk;
+
+ if (check_fs_open(argv[0]))
+ return;
+
+ if (!current_handle) {
+ com_err(argv[0], 0, "Extent handle not open");
+ return;
+ }
+
+ if (argc != 2) {
+ fprintf(stderr, "%s block\n", argv[0]);
+ return;
+ }
+
+ if (strtoblk(argv[0], argv[1], &blk))
+ return;
+
+ retval = ext2fs_extent_goto(current_handle, (blk64_t) blk);
+ if (retval) {
+ com_err(argv[0], retval, "while trying to go to block %lu",
+ blk);
+ return;
+ }
+
+ generic_goto_node(argv[0], EXT2_EXTENT_CURRENT);
+}
+#endif
+
git://git.whamcloud.com / tools / e2fsprogs.git / commitdiff