Initial implemenation of extents support for e2fsprogs. This is enough so that e2fsck will pass a valid filesystem containing extents. Eventually this will be split into a patch for the library changes, and a separate patch for e2fsck, followed by test cases for e2fsprogs. --- e2fsck/message.c | 2 + e2fsck/pass1.c | 86 ++++++- e2fsck/problem.c | 5 + e2fsck/problem.h | 3 + lib/ext2fs/Makefile.in | 68 +++++- lib/ext2fs/ext2_err.et.in | 40 +++- lib/ext2fs/ext2fs.h | 62 +++++- lib/ext2fs/ext3_extents.h | 20 ++ lib/ext2fs/extent.c | 616 +++++++++++++++++++++++++++++++++++++++++++++ lib/ext2fs/extent_dbg.ct | 32 +++ 10 files changed, 926 insertions(+), 8 deletions(-) create mode 100644 lib/ext2fs/extent.c create mode 100644 lib/ext2fs/extent_dbg.ct diff --git a/e2fsck/message.c b/e2fsck/message.c index b2e3e0f..accf3a0 100644 --- a/e2fsck/message.c +++ b/e2fsck/message.c @@ -80,6 +80,7 @@ * @S superblock * @u unattached * @v device + * @x extent * @z zero-length */ @@ -134,6 +135,7 @@ static const char *abbrevs[] = { N_("Ssuper@b"), N_("uunattached"), N_("vdevice"), + N_("xextent"), N_("zzero-length"), "@@", 0 diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c index 7fba823..f9b7ea3 100644 --- a/e2fsck/pass1.c +++ b/e2fsck/pass1.c @@ -908,10 +908,11 @@ void e2fsck_pass1(e2fsck_t ctx) ctx->fs_dind_count++; if (inode->i_block[EXT2_TIND_BLOCK]) ctx->fs_tind_count++; - if (inode->i_block[EXT2_IND_BLOCK] || - inode->i_block[EXT2_DIND_BLOCK] || - inode->i_block[EXT2_TIND_BLOCK] || - inode->i_file_acl) { + if (!(inode->i_flags & EXT4_EXTENTS_FL) && + (inode->i_block[EXT2_IND_BLOCK] || + inode->i_block[EXT2_DIND_BLOCK] || + inode->i_block[EXT2_TIND_BLOCK] || + inode->i_file_acl)) { inodes_to_process[process_inode_count].ino = ino; inodes_to_process[process_inode_count].inode = *inode; process_inode_count++; @@ -1488,6 +1489,78 @@ void e2fsck_clear_inode(e2fsck_t ctx, ext2_ino_t ino, e2fsck_write_inode(ctx, ino, inode, source); } +static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx, + ext2_extent_handle_t ehandle) +{ + struct ext2fs_extent extent; + blk_t blk; + e2_blkcnt_t blockcnt; + int i; + int is_dir, is_leaf; + + + pctx->errcode = ext2fs_extent_get(ehandle, EXT2_EXTENT_FIRST_SIB, + &extent); + while (!pctx->errcode) { + is_leaf = extent.e_flags & EXT2_EXTENT_FLAGS_LEAF; + is_dir = LINUX_S_ISDIR(pctx->inode->i_mode); + + if (!is_leaf) { + mark_block_used(ctx, extent.e_pblk); + pctx->errcode = ext2fs_extent_get(ehandle, + EXT2_EXTENT_DOWN, &extent); + scan_extent_node(ctx, pctx, ehandle); + pctx->errcode = ext2fs_extent_get(ehandle, + EXT2_EXTENT_UP, &extent); + goto next; + } + + for (blk = extent.e_pblk, blockcnt = extent.e_lblk, i = 0; + i < extent.e_len; + blk++, blockcnt++, i++) { + mark_block_used(ctx, blk); + + if (is_dir) { + pctx->errcode = ext2fs_add_dir_block(ctx->fs->dblist, pctx->ino, blk, blockcnt); + if (pctx->errcode) { + pctx->blk = blk; + pctx->num = blockcnt; + fix_problem(ctx, PR_1_ADD_DBLOCK, pctx); + /* Should never get here */ + ctx->flags |= E2F_FLAG_ABORT; + return; + } + } + } + next: + pctx->errcode = ext2fs_extent_get(ehandle, + EXT2_EXTENT_NEXT_SIB, + &extent); + } +} + + +static void check_blocks_extents(e2fsck_t ctx, struct problem_context *pctx, + char *block_buf) +{ + struct ext2_inode *inode = pctx->inode; + ext2_extent_handle_t ehandle; + ext2_filsys fs = ctx->fs; + ext2_ino_t ino = pctx->ino; + + pctx->errcode = ext2fs_extent_open(fs, ino, &ehandle); + if (pctx->errcode && + fix_problem(ctx, PR_1_READ_EXTENT, pctx)) { + e2fsck_clear_inode(ctx, ino, inode, 0, "check_blocks_extents"); + return; + } + + scan_extent_node(ctx, pctx, ehandle); + + ext2fs_extent_free(ehandle); + +} + /* * This subroutine is called on each inode to account for all of the * blocks used by that inode. @@ -1503,6 +1576,11 @@ static void check_blocks(e2fsck_t ctx, struct problem_context *pctx, int dirty_inode = 0; __u64 size; + if (inode->i_flags & EXT4_EXTENTS_FL) { + check_blocks_extents(ctx, pctx, block_buf); + return; + } + pb.ino = ino; pb.num_blocks = 0; pb.last_block = -1; diff --git a/e2fsck/problem.c b/e2fsck/problem.c index 0b6fd39..8c8be7e 100644 --- a/e2fsck/problem.c +++ b/e2fsck/problem.c @@ -784,6 +784,11 @@ static struct e2fsck_problem problem_table[] = { N_("@i %i is a %It but it looks like it is really a directory.\n"), PROMPT_FIX, 0 }, + /* Error while reading extent tree */ + { PR_1_READ_EXTENT, + N_("Error while reading over @x tree in @i %i: %m\n"), + PROMPT_CLEAR_INODE, 0 }, + /* Pass 1b errors */ /* Pass 1B: Rescan for duplicate/bad blocks */ diff --git a/e2fsck/problem.h b/e2fsck/problem.h index f5f7212..538dee2 100644 --- a/e2fsck/problem.h +++ b/e2fsck/problem.h @@ -455,6 +455,9 @@ struct problem_context { /* inode appears to be a directory */ #define PR_1_TREAT_AS_DIRECTORY 0x010055 +/* Error while reading extent tree */ +#define PR_1_READ_EXTENT 0x010056 + /* * Pass 1b errors */ diff --git a/lib/ext2fs/Makefile.in b/lib/ext2fs/Makefile.in index 03ce131..f3edbf7 100644 --- a/lib/ext2fs/Makefile.in +++ b/lib/ext2fs/Makefile.in @@ -10,6 +10,8 @@ INSTALL = @INSTALL@ @DEBUGFS_CMT@DEBUGFS_LIB_OBJS = bb_compat.o fileio.o \ @DEBUGFS_CMT@ inode_io.o namei.o write_bb_file.o +MK_CMDS= _SS_DIR_OVERRIDE=../ss ../ss/mk_cmds + @RESIZER_CMT@RESIZE_LIB_OBJS = dupfs.o test_io.o @IMAGER_CMT@E2IMAGE_LIB_OBJS = imager.o @@ -35,6 +37,7 @@ OBJS= $(DEBUGFS_LIB_OBJS) $(RESIZE_LIB_OBJS) $(E2IMAGE_LIB_OBJS) \ dir_iterate.o \ expanddir.o \ ext_attr.o \ + extent.o \ finddev.o \ flushb.o \ freefs.o \ @@ -90,6 +93,7 @@ SRCS= ext2_err.c \ $(srcdir)/dupfs.c \ $(srcdir)/expanddir.c \ $(srcdir)/ext_attr.c \ + $(srcdir)/extent.c \ $(srcdir)/fileio.c \ $(srcdir)/finddev.c \ $(srcdir)/flushb.c \ @@ -239,6 +243,68 @@ ext2_tdbtool: tdbtool.o @echo " LD $@" @$(CC) -o ext2_tdbtool tdbtool.o tdb.o +extent_dbg.c: $(srcdir)/extent_dbg.ct + @echo " MK_CMDS $<" + @$(MK_CMDS) $(srcdir)/extent_dbg.ct + +debug_cmds.c debug_cmds.h: $(top_srcdir)/debugfs/debug_cmds.ct + @echo " MK_CMDS $<@" + @$(MK_CMDS) $(top_srcdir)/debugfs/debug_cmds.ct + +DEBUG_OBJS= debug_cmds.o debugfs.o util.o ncheck.o icheck.o ls.o \ + lsdel.o dump.o set_fields.o logdump.o htree.o unused.o + +debugfs.o: $(top_srcdir)/debugfs/debugfs.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +util.o: $(top_srcdir)/debugfs/util.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +ncheck.o: $(top_srcdir)/debugfs/ncheck.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +icheck.o: $(top_srcdir)/debugfs/icheck.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +ls.o: $(top_srcdir)/debugfs/ls.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +lsdel.o: $(top_srcdir)/debugfs/lsdel.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +dump.o: $(top_srcdir)/debugfs/dump.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +set_fields.o: $(top_srcdir)/debugfs/set_fields.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +logdump.o: $(top_srcdir)/debugfs/logdump.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +htree.o: $(top_srcdir)/debugfs/htree.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +unused.o: $(top_srcdir)/debugfs/unused.c + @echo " CC $<" + @$(CC) $(ALL_CFLAGS) -c $< -o $@ + +tst_extents: $(srcdir)/extent.c extent_dbg.c $(DEBUG_OBJS) $(LIBSS) $(LIBE2P) $(DEPLIBUUID) $(DEPLIBBLKID) + @echo " LD $@" + @$(CC) -o tst_extents $(srcdir)/extent.c extent_dbg.c \ + $(ALL_CFLAGS) -DDEBUG $(DEBUG_OBJS) $(LIBSS) $(LIBE2P) \ + $(LIBUUID) $(STATIC_LIBEXT2FS) $(LIBBLKID) $(LIBCOM_ERR) \ + -I $(top_srcdir)/debugfs + mkjournal: mkjournal.c $(STATIC_LIBEXT2FS) @echo " LD $@" @$(CC) -o mkjournal $(srcdir)/mkjournal.c -DDEBUG $(STATIC_LIBEXT2FS) $(LIBCOM_ERR) $(ALL_CFLAGS) @@ -282,7 +348,7 @@ clean:: tst_badblocks tst_iscan ext2_err.et ext2_err.c ext2_err.h \ tst_byteswap tst_ismounted tst_getsize tst_sectgetsize \ tst_bitops tst_types tst_icount tst_super_size \ - ext2_tdbtool mkjournal \ + ext2_tdbtool mkjournal debug_cmds.c \ ../libext2fs.a ../libext2fs_p.a ../libext2fs_chk.a mostlyclean:: clean diff --git a/lib/ext2fs/ext2_err.et.in b/lib/ext2fs/ext2_err.et.in index eda4bb4..5d62548 100644 --- a/lib/ext2fs/ext2_err.et.in +++ b/lib/ext2fs/ext2_err.et.in @@ -62,8 +62,8 @@ ec EXT2_ET_MAGIC_E2IMAGE, ec EXT2_ET_MAGIC_INODE_IO_CHANNEL, "Wrong magic number for inode io_channel structure" -ec EXT2_ET_MAGIC_RESERVED_9, - "Wrong magic number --- RESERVED_9" +ec EXT2_ET_MAGIC_EXTENT_HANDLE, + "Wrong magic number for ext4 extent handle" ec EXT2_ET_BAD_MAGIC, "Bad magic number in super-block" @@ -326,5 +326,41 @@ ec EXT2_ET_TDB_ERR_NOEXIST, ec EXT2_ET_TDB_ERR_RDONLY, "TDB: Write not permitted" +ec EXT2_ET_EXTENT_HEADER_BAD, + "Corrupt extent header" + +ec EXT2_ET_EXTENT_INDEX_BAD, + "Corrupt extent index" + +ec EXT2_ET_EXTENT_LEAF_BAD, + "Corrupt extent" + +ec EXT2_ET_EXTENT_NO_SPACE, + "No free space in extent map" + +ec EXT2_ET_INODE_NOT_EXTENT, + "Inode does not use extents" + +ec EXT2_ET_EXTENT_NO_NEXT, + "No 'next' extent" + +ec EXT2_ET_EXTENT_NO_PREV, + "No 'previous' extent" + +ec EXT2_ET_EXTENT_NO_UP, + "No 'up' extent" + +ec EXT2_ET_EXTENT_NO_DOWN, + "No 'down' extent" + +ec EXT2_ET_NO_CURRENT_NODE, + "No current node" + +ec EXT2_ET_OP_NOT_SUPPORTED, + "Ext2fs operation not supported" + +ec EXT2_ET_CANT_INSERT_EXTENT, + "No room to insert extent in node" + end diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h index 83a9091..022d7f4 100644 --- a/lib/ext2fs/ext2fs.h +++ b/lib/ext2fs/ext2fs.h @@ -65,6 +65,7 @@ extern "C" { typedef __u32 ext2_ino_t; typedef __u32 blk_t; +typedef __u64 blk64_t; typedef __u32 dgrp_t; typedef __u32 ext2_off_t; typedef __s64 e2_blkcnt_t; @@ -285,6 +286,51 @@ struct struct_ext2_filsys { #endif /* + * Generic (non-filesystem layout specific) extents structure + */ + +#define EXT2_EXTENT_FLAGS_LEAF 0x0001 +#define EXT2_EXTENT_FLAGS_UNINIT 0x0002 + +struct ext2fs_extent { + blk64_t e_pblk; /* first physical block */ + blk64_t e_lblk; /* first logical block extent covers */ + __u32 e_len; /* number of blocks covered by extent */ + __u32 e_flags; /* extent flags */ +}; + +typedef struct ext2_extent_handle *ext2_extent_handle_t; + +/* + * Flags used by ext2fs_extent_get() + */ +#define EXT2_EXTENT_CURRENT 0x0000 +#define EXT2_EXTENT_MOVE_MASK 0x000F +#define EXT2_EXTENT_ROOT 0x0001 +#define EXT2_EXTENT_FIRST_SIB 0x0002 +#define EXT2_EXTENT_NEXT_SIB 0x0003 +#define EXT2_EXTENT_PREV_SIB 0x0004 +#define EXT2_EXTENT_UP 0x0005 +#define EXT2_EXTENT_DOWN 0x0006 +#define EXT2_EXTENT_NEXT_LEAF 0x0007 +#define EXT2_EXTENT_PREV_LEAF 0x0008 + +/* + * Data structure returned by ext2fs_extent_get_info() + */ +struct ext2_extent_info { + int curr_entry; + int curr_level; + int num_entries; + int max_entries; + int bytes_avail; + blk64_t max_lblk; + blk64_t max_pblk; + __u32 max_len; + __u32 max_uninit_len; +}; + +/* * Flags for directory block reading and writing functions */ #define EXT2_DIRBLOCK_V2_STRUCT 0x0001 @@ -437,7 +483,8 @@ typedef struct ext2_icount *ext2_icount_t; #define EXT2_LIB_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE|\ EXT3_FEATURE_INCOMPAT_JOURNAL_DEV|\ EXT2_FEATURE_INCOMPAT_META_BG|\ - EXT3_FEATURE_INCOMPAT_RECOVER) + EXT3_FEATURE_INCOMPAT_RECOVER|\ + EXT3_FEATURE_INCOMPAT_EXTENTS) #endif #define EXT2_LIB_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\ EXT2_FEATURE_RO_COMPAT_LARGE_FILE) @@ -715,6 +762,19 @@ extern errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk, char *block_buf, int adjust, __u32 *newcount); +/* extent.c */ +extern errcode_t ext2fs_extent_open(ext2_filsys fs, ext2_ino_t ino, + ext2_extent_handle_t *handle); +extern errcode_t ext2fs_extent_get(ext2_extent_handle_t handle, + int flags, struct ext2fs_extent *extent); +extern errcode_t ext2fs_extent_replace(ext2_extent_handle_t handle, int flags, + struct ext2fs_extent *extent); +extern errcode_t ext2fs_extent_insert(ext2_extent_handle_t handle, int flags, + struct ext2fs_extent *extent); +extern errcode_t ext2fs_extent_delete(ext2_extent_handle_t handle, int flags); +extern errcode_t ext2fs_extent_get_info(ext2_extent_handle_t handle, + struct ext2_extent_info *info); + /* fileio.c */ extern errcode_t ext2fs_file_open2(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode *inode, diff --git a/lib/ext2fs/ext3_extents.h b/lib/ext2fs/ext3_extents.h index c4178c9..ba980e4 100644 --- a/lib/ext2fs/ext3_extents.h +++ b/lib/ext2fs/ext3_extents.h @@ -126,6 +126,26 @@ struct ext3_ext_path { #define EXT_MAX_BLOCK 0xffffffff #define EXT_CACHE_MARK 0xffff +/* + * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an + * initialized extent. This is 2^15 and not (2^16 - 1), since we use the + * MSB of ee_len field in the extent datastructure to signify if this + * particular extent is an initialized extent or an uninitialized (i.e. + * preallocated). + * EXT_UNINIT_MAX_LEN is the maximum number of blocks we can have in an + * uninitialized extent. + * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an + * uninitialized one. In other words, if MSB of ee_len is set, it is an + * uninitialized extent with only one special scenario when ee_len = 0x8000. + * In this case we can not have an uninitialized extent of zero length and + * thus we make it as a special case of initialized extent with 0x8000 length. + * This way we get better extent-to-group alignment for initialized extents. + * Hence, the maximum number of blocks we can have in an *initialized* + * extent is 2^15 (32768) and in an *uninitialized* extent is 2^15-1 (32767). + */ +#define EXT_INIT_MAX_LEN (1UL << 15) +#define EXT_UNINIT_MAX_LEN (EXT_INIT_MAX_LEN - 1) + #define EXT_FIRST_EXTENT(__hdr__) \ ((struct ext3_extent *) (((char *) (__hdr__)) + \ diff --git a/lib/ext2fs/extent.c b/lib/ext2fs/extent.c new file mode 100644 index 0000000..a6f4f65 --- /dev/null +++ b/lib/ext2fs/extent.c @@ -0,0 +1,616 @@ +/* + * 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; + 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; +}; + +/* + * Useful Debugging stuff + */ + +#ifdef DEBUG +#define EXT_DEBUG +#endif + +#ifdef EXT_DEBUG +static void ext_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 ext_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 ext_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); +} + +#define ext_printf(fmt, args...) printf(fmt, ## args) +#else +#define ext_show_header(eh) do { } while (0) +#define ext_show_index(ix) do { } while (0) +#define ext_show_extent(ex) do { } while (0) +#define ext_printf(fmt, args...) do { } while (0) +#endif + +/* + * 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; + + if (ext2fs_le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC) + return EXT2_ET_EXTENT_HEADER_BAD; + + ext_show_header(eh); + + 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->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; + + EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE); + + if (!handle->path) + return EXT2_ET_NO_CURRENT_NODE; + + path = handle->path + handle->level; + switch (flags & EXT2_EXTENT_MOVE_MASK) { + case EXT2_EXTENT_CURRENT: + ix = path->curr; + break; + case EXT2_EXTENT_ROOT: + handle->level = 0; + case EXT2_EXTENT_FIRST_SIB: + path->left = path->entries; + path->curr = 0; + case EXT2_EXTENT_NEXT_SIB: + if (path->curr) { + if (path->left <= 0) + return EXT2_ET_EXTENT_NO_NEXT; + ix = path->curr; + ix++; + } else { + if (path->entries == 0) + return EXT2_ET_EXTENT_NO_NEXT; + eh = (struct ext3_extent_header *) path->buf; + ix = EXT_FIRST_INDEX(eh); + } + path->left--; + path->curr = ix; + 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++; + break; + case EXT2_EXTENT_UP: + if (handle->level <= 0) + return EXT2_ET_EXTENT_NO_UP; + handle->level--; + path--; + ix = path->curr; + break; + case EXT2_EXTENT_DOWN: + 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; + + ext_show_header(eh); + 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; + + ix = EXT_FIRST_INDEX((struct ext3_extent_header *) eh); + newpath->curr = ix; + newpath->left = newpath->entries - 1; + path = newpath; + + ext_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; + + ext_printf("Left is now: %d\n", path->left); + + 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; + } + + 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_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->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->path) + return EXT2_ET_NO_CURRENT_NODE; + + path = handle->path + handle->level; + + eh = (struct ext3_extent_header *) path->buf; + if (path->curr) { + ix = path->curr; + ix++; + } else + path->curr = ix = EXT_FIRST_INDEX(eh); + + if (path->left) + memmove(ix, ix + 1, + path->left * sizeof(struct ext3_extent_idx)); + path->left++; + 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->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; + } + + 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; + + retval = ext2fs_extent_get(current_handle, op, &extent); + if (retval) { + com_err(cmd_name, retval, 0); + return; + } + printf("Extent: lblk %llu, len %lu, pblk %llu, flags: ", + extent.e_lblk, 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) + fputs("(none)", stdout); + fputc('\n', stdout); +} + + +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_first_sib(int argc, char *argv[]) +{ + generic_goto_node(argv[0], EXT2_EXTENT_FIRST_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_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); +} + +#endif diff --git a/lib/ext2fs/extent_dbg.ct b/lib/ext2fs/extent_dbg.ct new file mode 100644 index 0000000..21ece39 --- /dev/null +++ b/lib/ext2fs/extent_dbg.ct @@ -0,0 +1,32 @@ +# +# Copyright (C) 1993 Theodore Ts'o. This file may be redistributed +# under the terms of the GNU Public License. +# +command_table extent_cmds; + +request do_inode, "Open an inode", + inode; + +request do_current_node, "Current extent node", + current_node, current; + +request do_root_node, "Goto root extent", + root_node, root; + +request do_first_sib, "First sibling", + first_sibling, first_sib; + +request do_next_sib, "Next sibling", + next_sibling, next_sib, next; + +request do_prev_sib, "Previous sibling", + prev_sibling, prev_sib, prev; + +request do_up, "Up node", + up_node, up; + +request do_down, "Down node", + down_node, down; + +end; + -- 1.5.3.1.19.gb5ef6 - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html