diff options
Diffstat (limited to '')
| -rw-r--r-- | contrib/android/fsmap.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/contrib/android/fsmap.c b/contrib/android/fsmap.c new file mode 100644 index 0000000..9ee8472 --- /dev/null +++ b/contrib/android/fsmap.c @@ -0,0 +1,169 @@ +#include "fsmap.h" +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include "support/nls-enable.h" + +struct walk_ext_priv_data { + char *path; + ext2_filsys fs; + struct fsmap_format *format; +}; + +static int walk_block(ext2_filsys fs EXT2FS_ATTR((unused)), blk64_t *blocknr, + e2_blkcnt_t blockcnt, + blk64_t ref64_blk EXT2FS_ATTR((unused)), + int ref_offset EXT2FS_ATTR((unused)), + void *priv) +{ + struct walk_ext_priv_data *pdata = priv; + struct fsmap_format *format = pdata->format; + + return format->add_block(fs, *blocknr, blockcnt < 0, format->private); +} + +static errcode_t ino_iter_extents(ext2_filsys fs, ext2_ino_t ino, + ext2_extent_handle_t extents, + struct walk_ext_priv_data *pdata) +{ + blk64_t block; + errcode_t retval; + blk64_t next_lblk = 0; + int op = EXT2_EXTENT_ROOT; + struct ext2fs_extent extent; + struct fsmap_format *format = pdata->format; + + for (;;) { + retval = ext2fs_extent_get(extents, op, &extent); + if (retval) + break; + + op = EXT2_EXTENT_NEXT; + + if ((extent.e_flags & EXT2_EXTENT_FLAGS_SECOND_VISIT) || + !(extent.e_flags & EXT2_EXTENT_FLAGS_LEAF)) + continue; + + for (; next_lblk < extent.e_lblk; next_lblk++) + format->add_block(fs, 0, 0, format->private); + + block = extent.e_pblk; + for (; next_lblk < extent.e_lblk + extent.e_len; next_lblk++) + format->add_block(fs, block++, 0, format->private); + } + + if (retval == EXT2_ET_EXTENT_NO_NEXT) + retval = 0; + if (retval) { + com_err(__func__, retval, ("getting extents of ino \"%u\""), + ino); + } + return retval; +} + +static errcode_t ino_iter_blocks(ext2_filsys fs, ext2_ino_t ino, + struct walk_ext_priv_data *pdata) +{ + errcode_t retval; + struct ext2_inode inode; + ext2_extent_handle_t extents; + struct fsmap_format *format = pdata->format; + + retval = ext2fs_read_inode(fs, ino, &inode); + if (retval) + return retval; + + if (!ext2fs_inode_has_valid_blocks2(fs, &inode)) + return format->inline_data(&(inode.i_block[0]), + format->private); + + retval = ext2fs_extent_open(fs, ino, &extents); + if (retval == EXT2_ET_INODE_NOT_EXTENT) { + retval = ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_READ_ONLY, + NULL, walk_block, pdata); + if (retval) { + com_err(__func__, retval, _("listing blocks of ino \"%u\""), + ino); + } + return retval; + } + + retval = ino_iter_extents(fs, ino, extents, pdata); + + ext2fs_extent_free(extents); + return retval; +} + +static int is_dir(ext2_filsys fs, ext2_ino_t ino) +{ + struct ext2_inode inode; + + if (ext2fs_read_inode(fs, ino, &inode)) + return 0; + return S_ISDIR(inode.i_mode); +} + +static int walk_ext_dir(ext2_ino_t dir EXT2FS_ATTR((unused)), + int flags EXT2FS_ATTR((unused)), + struct ext2_dir_entry *de, + int offset EXT2FS_ATTR((unused)), + int blocksize EXT2FS_ATTR((unused)), + char *buf EXT2FS_ATTR((unused)), void *priv_data) +{ + errcode_t retval; + struct ext2_inode inode; + char *filename, *cur_path, *name = de->name; + int name_len = de->name_len & 0xff; + struct walk_ext_priv_data *pdata = priv_data; + struct fsmap_format *format = pdata->format; + + if (!strncmp(name, ".", name_len) + || !strncmp(name, "..", name_len) + || !strncmp(name, "lost+found", 10)) + return 0; + + if (asprintf(&filename, "%s/%.*s", pdata->path, name_len, name) < 0) + return -ENOMEM; + + retval = ext2fs_read_inode(pdata->fs, de->inode, &inode); + if (retval) { + com_err(__func__, retval, _("reading ino \"%u\""), de->inode); + goto end; + } + format->start_new_file(filename, de->inode, &inode, format->private); + retval = ino_iter_blocks(pdata->fs, de->inode, pdata); + if (retval) + return retval; + format->end_new_file(format->private); + + retval = 0; + if (is_dir(pdata->fs, de->inode)) { + cur_path = pdata->path; + pdata->path = filename; + retval = ext2fs_dir_iterate2(pdata->fs, de->inode, 0, NULL, + walk_ext_dir, pdata); + pdata->path = cur_path; + } + +end: + free(filename); + return retval; +} + +errcode_t fsmap_iter_filsys(ext2_filsys fs, struct fsmap_format *format, + const char *file, const char *mountpoint) +{ + struct walk_ext_priv_data pdata; + errcode_t retval; + + format->private = format->init(file, mountpoint); + pdata.fs = fs; + pdata.path = ""; + pdata.format = format; + + retval = ext2fs_dir_iterate2(fs, EXT2_ROOT_INO, 0, NULL, walk_ext_dir, &pdata); + + format->cleanup(format->private); + return retval; +} |