return extent_goto(handle, 0, blk);
}
+/*
+ * Traverse back up to root fixing parents of current node as needed.
+ *
+ * If we changed start of first entry in a node, fix parent index start
+ * and so on.
+ *
+ * Safe to call for any position in node; if not at the first entry,
+ * will simply return.
+ */
+static errcode_t ext2fs_extent_fix_parents(ext2_extent_handle_t handle)
+{
+ int retval = 0;
+ blk64_t start;
+ struct extent_path *path;
+ struct ext2fs_extent extent;
+
+ 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;
+
+ retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
+ if (retval)
+ goto done;
+
+ /* modified node's start block */
+ start = extent.e_lblk;
+
+ /* traverse up until index not first, or startblk matches, or top */
+ while (handle->level > 0 &&
+ (path->left == path->entries - 1)) {
+ retval = ext2fs_extent_get(handle, EXT2_EXTENT_UP, &extent);
+ if (retval)
+ goto done;
+ if (extent.e_lblk == start)
+ break;
+ path = handle->path + handle->level;
+ extent.e_len += (extent.e_lblk - start);
+ extent.e_lblk = start;
+ retval = ext2fs_extent_replace(handle, 0, &extent);
+ if (retval)
+ goto done;
+ update_path(handle);
+ }
+
+ /* put handle back to where we started */
+ retval = ext2fs_extent_goto(handle, start);
+done:
+ return retval;
+}
+
errcode_t ext2fs_extent_replace(ext2_extent_handle_t handle,
int flags EXT2FS_ATTR((unused)),
struct ext2fs_extent *extent)
return retval;
}
+/*
+ * Sets the physical block for a logical file block in the extent tree.
+ *
+ * May: map unmapped, unmap mapped, or remap mapped blocks.
+ *
+ * Mapping an unmapped block adds a single-block extent.
+ *
+ * Unmapping first or last block modifies extent in-place
+ * - But may need to fix parent's starts too in first-block case
+ *
+ * Mapping any unmapped block requires adding a (single-block) extent
+ * and inserting into proper point in tree.
+ *
+ * Modifying (unmapping or remapping) a block in the middle
+ * of an extent requires splitting the extent.
+ * - Remapping case requires new single-block extent.
+ *
+ * Remapping first or last block adds an extent.
+ *
+ * We really need extent adding to be smart about merging.
+ */
+
+errcode_t ext2fs_extent_set_bmap(ext2_extent_handle_t handle,
+ blk64_t logical, blk64_t physical, int flags)
+{
+ errcode_t ec, retval = 0;
+ int mapped = 1; /* logical is mapped? */
+ int orig_height;
+ int extent_uninit = 0;
+ int new_uninit = 0;
+ int max_len = EXT_INIT_MAX_LEN;
+ blk64_t orig_lblk;
+ struct extent_path *path;
+ struct ext2fs_extent extent;
+ struct ext2fs_extent newextent;
+ struct ext2_extent_info info;
+
+ 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 (flags & EXT2_EXTENT_SET_BMAP_UNINIT) {
+ new_uninit = 1;
+ max_len = EXT_UNINIT_MAX_LEN;
+ }
+
+ /* if (re)mapping, set up new extent to insert */
+ if (physical) {
+ newextent.e_len = 1;
+ newextent.e_pblk = physical;
+ newextent.e_lblk = logical;
+ newextent.e_flags = EXT2_EXTENT_FLAGS_LEAF;
+ if (new_uninit)
+ newextent.e_flags |= EXT2_EXTENT_FLAGS_UNINIT;
+ }
+
+ /* special case if the extent tree is completely empty */
+ if ((handle->max_depth == 0) && (path->entries == 0)) {
+ retval = ext2fs_extent_insert(handle, 0, &newextent);
+ goto done;
+ }
+
+ /* save our original location in the extent tree */
+ if ((retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT,
+ &extent))) {
+ if (retval != EXT2_ET_NO_CURRENT_NODE)
+ return retval;
+ memset(&extent, 0, sizeof(extent));
+ }
+ if ((retval = ext2fs_extent_get_info(handle, &info)))
+ return retval;
+ orig_height = info.max_depth - info.curr_level;
+ orig_lblk = extent.e_lblk;
+
+ /* go to the logical spot we want to (re/un)map */
+ retval = ext2fs_extent_goto(handle, logical);
+ if (retval) {
+ if (retval == EXT2_ET_EXTENT_NOT_FOUND) {
+ retval = 0;
+ mapped = 0;
+ if (!physical) {
+ dbg_printf("block already unmapped\n");
+ goto done;
+ }
+ } else
+ goto done;
+ }
+
+ /*
+ * This may be the extent *before* the requested logical,
+ * if it's currently unmapped.
+ */
+ retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
+ if (retval)
+ goto done;
+ if (extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT)
+ extent_uninit = 1;
+
+ /* check if already pointing to the requested physical */
+ if (mapped && (new_uninit == extent_uninit) &&
+ (extent.e_pblk + (logical - extent.e_lblk) == physical)) {
+ dbg_printf("physical block unchanged\n");
+ goto done;
+ }
+
+ if (!mapped) {
+ dbg_printf("mapping unmapped logical block\n");
+ if ((logical == extent.e_lblk + extent.e_len) &&
+ (physical == extent.e_pblk + extent.e_len) &&
+ (new_uninit == extent_uninit) &&
+ (extent.e_len < max_len-1)) {
+ extent.e_len++;
+ retval = ext2fs_extent_replace(handle, 0, &extent);
+ } else
+ retval = ext2fs_extent_insert(handle,
+ EXT2_EXTENT_INSERT_AFTER, &newextent);
+ if (retval)
+ goto done;
+ retval = ext2fs_extent_fix_parents(handle);
+ if (retval)
+ goto done;
+ } else if ((logical == extent.e_lblk) && (extent.e_len == 1)) {
+ dbg_printf("(re/un)mapping only block in extent\n");
+ if (physical) {
+ extent.e_pblk = physical;
+ retval = ext2fs_extent_replace(handle, 0, &extent);
+ } else {
+ retval = ext2fs_extent_delete(handle, 0);
+ if (retval)
+ goto done;
+ ec = ext2fs_extent_fix_parents(handle);
+ if (ec != EXT2_ET_NO_CURRENT_NODE)
+ retval = ec;
+ }
+
+ if (retval)
+ goto done;
+ } else if (logical == extent.e_lblk + extent.e_len - 1) {
+ dbg_printf("(re/un)mapping last block in extent\n");
+ extent.e_len--;
+ retval = ext2fs_extent_replace(handle, 0, &extent);
+ if (retval)
+ goto done;
+ if (physical) {
+ retval = ext2fs_extent_insert(handle,
+ EXT2_EXTENT_INSERT_AFTER, &newextent);
+ if (retval)
+ goto done;
+ }
+ } else if (logical == extent.e_lblk) {
+ dbg_printf("(re/un)mapping first block in extent\n");
+ extent.e_pblk++;
+ extent.e_lblk++;
+ extent.e_len--;
+ retval = ext2fs_extent_replace(handle, 0, &extent);
+ if (retval)
+ goto done;
+ if (physical) {
+ /* insert new extent ahead of current */
+ retval = ext2fs_extent_insert(handle,
+ 0, &newextent);
+ if (retval)
+ goto done;
+ } else {
+ retval = ext2fs_extent_fix_parents(handle);
+ if (retval)
+ goto done;
+ }
+ } else {
+ __u32 orig_length;
+
+ dbg_printf("(re/un)mapping in middle of extent\n");
+ /* need to split this extent; later */
+
+ orig_length = extent.e_len;
+
+ /* shorten pre-split extent */
+ extent.e_len = (logical - extent.e_lblk);
+ retval = ext2fs_extent_replace(handle, 0, &extent);
+ if (retval)
+ goto done;
+ /* insert our new extent, if any */
+ if (physical) {
+ /* insert new extent after current */
+ retval = ext2fs_extent_insert(handle,
+ EXT2_EXTENT_INSERT_AFTER, &newextent);
+ if (retval)
+ goto done;
+ }
+ /* add post-split extent */
+ extent.e_pblk += extent.e_len + 1;
+ extent.e_lblk += extent.e_len + 1;
+ extent.e_len = orig_length - extent.e_len - 1;
+ retval = ext2fs_extent_insert(handle,
+ EXT2_EXTENT_INSERT_AFTER, &extent);
+ if (retval)
+ goto done;
+ }
+
+done:
+ /* get handle back to its position */
+ if (orig_height > handle->max_depth)
+ orig_height = handle->max_depth; /* In case we shortened the tree */
+ extent_goto(handle, orig_height, orig_lblk);
+ return retval;
+}
+
errcode_t ext2fs_extent_delete(ext2_extent_handle_t handle,
int flags EXT2FS_ATTR((unused)))
{
ext2_ino_t current_ino = 0;
ext2_extent_handle_t current_handle;
+int common_extent_args_process(int argc, char *argv[], int min_argc,
+ int max_argc, const char *cmd,
+ const char *usage, int flags)
+{
+ if (common_args_process(argc, argv, min_argc, max_argc, cmd,
+ usage, flags))
+ return 1;
+
+ if (!current_handle) {
+ com_err(cmd, 0, "Extent handle not open");
+ return 1;
+ }
+ return 0;
+}
+
void do_inode(int argc, char *argv[])
{
ext2_ino_t inode;
errcode_t retval;
int err;
- if (check_fs_read_write(argv[0]))
+ if (common_extent_args_process(argc, argv, 1, 1, "delete_node",
+ "", CHECK_FS_RW | CHECK_FS_BITMAPS))
return;
retval = ext2fs_extent_delete(current_handle, 0);
void do_replace_node(int argc, char *argv[])
{
+ const char *usage = "[--uninit] <lblk> <len> <pblk>";
errcode_t retval;
struct ext2fs_extent extent;
int err;
- if (check_fs_read_write(argv[0]))
+ if (common_extent_args_process(argc, argv, 3, 5, "replace_node",
+ usage, CHECK_FS_RW | CHECK_FS_BITMAPS))
return;
extent.e_flags = 0;
}
if (argc != 4) {
- fprintf(stderr, "usage: %s <lblk> <len> <pblk>\n", argv[0]);
+ fprintf(stderr, "Usage: %s %s\n", argv[0], usage);
return;
}
- extent.e_lblk = parse_ulong(argv[1], argv[0],
- "logical block", &err);
+ 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);
+ 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);
+ extent.e_pblk = parse_ulong(argv[3], argv[0], "logical block", &err);
if (err)
return;
int err;
int flags = 0;
- if (check_fs_open(argv[0]))
- return;
-
- if (check_fs_read_write(argv[0]))
- return;
-
- if (!current_handle) {
- com_err(argv[0], 0, "Extent handle not open");
+ if (common_extent_args_process(argc, argv, 1, 1, "split_node",
+ "", CHECK_FS_RW | CHECK_FS_BITMAPS))
return;
- }
retval = extent_node_split(current_handle, flags);
if (retval) {
void do_insert_node(int argc, char *argv[])
{
+ const char *usage = "[--after] [--uninit] <lblk> <len> <pblk>";
errcode_t retval;
struct ext2fs_extent extent;
char *cmd;
int err;
int flags = 0;
- if (check_fs_read_write(argv[0]))
+ if (common_extent_args_process(argc, argv, 3, 6, "insert_node",
+ usage, CHECK_FS_RW | CHECK_FS_BITMAPS))
return;
cmd = argv[0];
}
if (argc != 4) {
- fprintf(stderr, "usage: %s [--after] <lblk> <len> <pblk>\n", cmd);
+ fprintf(stderr, "usage: %s %s\n", cmd, usage);
return;
}
do_current_node(argc, argv);
}
+void do_set_bmap(int argc, char **argv)
+{
+ const char *usage = "[--uninit] <lblk> <pblk>";
+ errcode_t retval;
+ blk_t logical;
+ blk_t physical;
+ char *cmd = argv[0];
+ int flags = 0;
+ int err;
+
+ if (common_extent_args_process(argc, argv, 3, 5, "set_bmap",
+ usage, CHECK_FS_RW | CHECK_FS_BITMAPS))
+ return;
+
+ if (argc > 2 && !strcmp(argv[1], "--uninit")) {
+ argc--;
+ argv++;
+ flags |= EXT2_EXTENT_SET_BMAP_UNINIT;
+ }
+
+ if (argc != 3) {
+ fprintf(stderr, "Usage: %s %s\n", cmd, usage);
+ return;
+ }
+
+ logical = parse_ulong(argv[1], cmd,
+ "logical block", &err);
+ if (err)
+ return;
+
+ physical = parse_ulong(argv[2], cmd,
+ "physical block", &err);
+ if (err)
+ return;
+
+ retval = ext2fs_extent_set_bmap(current_handle, logical,
+ (blk64_t) physical, flags);
+ if (retval) {
+ com_err(cmd, retval, 0);
+ return;
+ }
+ if (current_handle->path && current_handle->path[0].curr)
+ do_current_node(argc, argv);
+}
+
void do_print_all(int argc, char **argv)
{
+ const char *usage = "[--leaf-only|--reverse|--reverse-leaf]";
struct ext2fs_extent extent;
errcode_t retval;
errcode_t end_err = EXT2_ET_EXTENT_NO_NEXT;
int first_op = EXT2_EXTENT_ROOT;
- if (check_fs_open(argv[0]))
+ if (common_extent_args_process(argc, argv, 1, 2, "print_all",
+ usage, 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;
op = EXT2_EXTENT_PREV_LEAF;
first_op = EXT2_EXTENT_LAST_LEAF;
end_err = EXT2_ET_EXTENT_NO_PREV;
- } else
- goto print_usage;
+ } else {
+ fprintf(stderr, "Usage: %s %s\n", argv[0], usage);
+ return;
+ }
}
retval = ext2fs_extent_get(current_handle, first_op, &extent);
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");
+ if (common_extent_args_process(argc, argv, 1, 1, "info", "", 0))
return;
- }
retval = ext2fs_extent_get_info(current_handle, &info);
if (retval) {
blk_t blk;
int level = 0;
- if (check_fs_open(argv[0]))
- return;
-
- if (!current_handle) {
- com_err(argv[0], 0, "Extent handle not open");
- return;
- }
-
- if (argc < 2 || argc > 3) {
- fprintf(stderr, "%s block [level]\n", argv[0]);
+ if (common_extent_args_process(argc, argv, 2, 3, "goto_block",
+ "block [level]", 0))
return;
- }
if (strtoblk(argv[0], argv[1], &blk))
return;
git://git.whamcloud.com / tools / e2fsprogs.git / commitdiff