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inode.c

/*
 * inode.c --- utility routines to read and write inodes
 * 
 * Copyright (C) 1993, 1994, 1995, 1996, 1997 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"

struct ext2_struct_inode_scan {
      errcode_t         magic;
      ext2_filsys       fs;
      ext2_ino_t        current_inode;
      blk_t             current_block;
      dgrp_t                  current_group;
      ext2_ino_t        inodes_left;
      blk_t             blocks_left;
      dgrp_t                  groups_left;
      blk_t             inode_buffer_blocks;
      char *                  inode_buffer;
      int               inode_size;
      char *                  ptr;
      int               bytes_left;
      char              *temp_buffer;
      errcode_t         (*done_group)(ext2_filsys fs,
                                    ext2_inode_scan scan,
                                    dgrp_t group,
                                    void * priv_data);
      void *                  done_group_data;
      int               bad_block_ptr;
      int               scan_flags;
      int               reserved[6];
};

/*
 * This routine flushes the icache, if it exists.
 */
errcode_t ext2fs_flush_icache(ext2_filsys fs)
{
      int   i;
      
      if (!fs->icache)
            return 0;

      for (i=0; i < fs->icache->cache_size; i++)
            fs->icache->cache[i].ino = 0;

      fs->icache->buffer_blk = 0;
      return 0;
}

static errcode_t create_icache(ext2_filsys fs)
{
      errcode_t   retval;
      
      if (fs->icache)
            return 0;
      retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache), &fs->icache);
      if (retval)
            return retval;

      memset(fs->icache, 0, sizeof(struct ext2_inode_cache));
      retval = ext2fs_get_mem(fs->blocksize, &fs->icache->buffer);
      if (retval) {
            ext2fs_free_mem(&fs->icache);
            return retval;
      }
      fs->icache->buffer_blk = 0;
      fs->icache->cache_last = -1;
      fs->icache->cache_size = 4;
      fs->icache->refcount = 1;
      retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache_ent)
                        * fs->icache->cache_size,
                        &fs->icache->cache);
      if (retval) {
            ext2fs_free_mem(&fs->icache->buffer);
            ext2fs_free_mem(&fs->icache);
            return retval;
      }
      ext2fs_flush_icache(fs);
      return 0;
}

errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks,
                         ext2_inode_scan *ret_scan)
{
      ext2_inode_scan   scan;
      errcode_t   retval;
      errcode_t (*save_get_blocks)(ext2_filsys f, ext2_ino_t ino, blk_t *blocks);

      EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

      /*
       * If fs->badblocks isn't set, then set it --- since the inode
       * scanning functions require it.
       */
      if (fs->badblocks == 0) {
            /*
             * Temporarly save fs->get_blocks and set it to zero,
             * for compatibility with old e2fsck's.
             */
            save_get_blocks = fs->get_blocks;
            fs->get_blocks = 0;
            retval = ext2fs_read_bb_inode(fs, &fs->badblocks);
            if (retval && fs->badblocks) {
                  ext2fs_badblocks_list_free(fs->badblocks);
                  fs->badblocks = 0;
            }
            fs->get_blocks = save_get_blocks;
      }

      retval = ext2fs_get_mem(sizeof(struct ext2_struct_inode_scan), &scan);
      if (retval)
            return retval;
      memset(scan, 0, sizeof(struct ext2_struct_inode_scan));

      scan->magic = EXT2_ET_MAGIC_INODE_SCAN;
      scan->fs = fs;
      scan->inode_size = EXT2_INODE_SIZE(fs->super);
      scan->bytes_left = 0;
      scan->current_group = 0;
      scan->groups_left = fs->group_desc_count - 1;
      scan->inode_buffer_blocks = buffer_blocks ? buffer_blocks : 8;
      scan->current_block = scan->fs->
            group_desc[scan->current_group].bg_inode_table;
      scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super);
      scan->blocks_left = scan->fs->inode_blocks_per_group;
      retval = ext2fs_get_mem((size_t) (scan->inode_buffer_blocks * 
                                fs->blocksize),
                        &scan->inode_buffer);
      scan->done_group = 0;
      scan->done_group_data = 0;
      scan->bad_block_ptr = 0;
      if (retval) {
            ext2fs_free_mem(&scan);
            return retval;
      }
      retval = ext2fs_get_mem(scan->inode_size, &scan->temp_buffer);
      if (retval) {
            ext2fs_free_mem(&scan->inode_buffer);
            ext2fs_free_mem(&scan);
            return retval;
      }
      if (scan->fs->badblocks && scan->fs->badblocks->num)
            scan->scan_flags |= EXT2_SF_CHK_BADBLOCKS;
      *ret_scan = scan;
      return 0;
}

void ext2fs_close_inode_scan(ext2_inode_scan scan)
{
      if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN))
            return;
      
      ext2fs_free_mem(&scan->inode_buffer);
      scan->inode_buffer = NULL;
      ext2fs_free_mem(&scan->temp_buffer);
      scan->temp_buffer = NULL;
      ext2fs_free_mem(&scan);
      return;
}

void ext2fs_set_inode_callback(ext2_inode_scan scan,
                         errcode_t (*done_group)(ext2_filsys fs,
                                           ext2_inode_scan scan,
                                           dgrp_t group,
                                           void * priv_data),
                         void *done_group_data)
{
      if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN))
            return;
      
      scan->done_group = done_group;
      scan->done_group_data = done_group_data;
}

int ext2fs_inode_scan_flags(ext2_inode_scan scan, int set_flags,
                      int clear_flags)
{
      int   old_flags;

      if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN))
            return 0;

      old_flags = scan->scan_flags;
      scan->scan_flags &= ~clear_flags;
      scan->scan_flags |= set_flags;
      return old_flags;
}

/*
 * This function is called by ext2fs_get_next_inode when it needs to
 * get ready to read in a new blockgroup.
 */
static errcode_t get_next_blockgroup(ext2_inode_scan scan)
{
      scan->current_group++;
      scan->groups_left--;
                  
      scan->current_block = scan->fs->
            group_desc[scan->current_group].bg_inode_table;

      scan->current_inode = scan->current_group *
            EXT2_INODES_PER_GROUP(scan->fs->super);

      scan->bytes_left = 0;
      scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super);
      scan->blocks_left = scan->fs->inode_blocks_per_group;
      return 0;
}

errcode_t ext2fs_inode_scan_goto_blockgroup(ext2_inode_scan scan,
                                  int     group)
{
      scan->current_group = group - 1;
      scan->groups_left = scan->fs->group_desc_count - group;
      return get_next_blockgroup(scan);
}

/*
 * This function is called by get_next_blocks() to check for bad
 * blocks in the inode table.
 *
 * This function assumes that badblocks_list->list is sorted in
 * increasing order.
 */
static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan,
                                  blk_t *num_blocks)
{
      blk_t blk = scan->current_block;
      badblocks_list    bb = scan->fs->badblocks;

      /*
       * If the inode table is missing, then obviously there are no
       * bad blocks.  :-)
       */
      if (blk == 0)
            return 0;

      /*
       * If the current block is greater than the bad block listed
       * in the bad block list, then advance the pointer until this
       * is no longer the case.  If we run out of bad blocks, then
       * we don't need to do any more checking!
       */
      while (blk > bb->list[scan->bad_block_ptr]) {
            if (++scan->bad_block_ptr >= bb->num) {
                  scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS;
                  return 0;
            }
      }

      /*
       * If the current block is equal to the bad block listed in
       * the bad block list, then handle that one block specially.
       * (We could try to handle runs of bad blocks, but that
       * only increases CPU efficiency by a small amount, at the
       * expense of a huge expense of code complexity, and for an
       * uncommon case at that.)
       */
      if (blk == bb->list[scan->bad_block_ptr]) {
            scan->scan_flags |= EXT2_SF_BAD_INODE_BLK;
            *num_blocks = 1;
            if (++scan->bad_block_ptr >= bb->num)
                  scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS;
            return 0;
      }

      /*
       * If there is a bad block in the range that we're about to
       * read in, adjust the number of blocks to read so that we we
       * don't read in the bad block.  (Then the next block to read
       * will be the bad block, which is handled in the above case.)
       */
      if ((blk + *num_blocks) > bb->list[scan->bad_block_ptr])
            *num_blocks = (int) (bb->list[scan->bad_block_ptr] - blk);

      return 0;
}

/*
 * This function is called by ext2fs_get_next_inode when it needs to
 * read in more blocks from the current blockgroup's inode table.
 */
static errcode_t get_next_blocks(ext2_inode_scan scan)
{
      blk_t       num_blocks;
      errcode_t   retval;

      /*
       * Figure out how many blocks to read; we read at most
       * inode_buffer_blocks, and perhaps less if there aren't that
       * many blocks left to read.
       */
      num_blocks = scan->inode_buffer_blocks;
      if (num_blocks > scan->blocks_left)
            num_blocks = scan->blocks_left;

      /*
       * If the past block "read" was a bad block, then mark the
       * left-over extra bytes as also being bad.
       */
      if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) {
            if (scan->bytes_left)
                  scan->scan_flags |= EXT2_SF_BAD_EXTRA_BYTES;
            scan->scan_flags &= ~EXT2_SF_BAD_INODE_BLK;
      }

      /*
       * Do inode bad block processing, if necessary.
       */
      if (scan->scan_flags & EXT2_SF_CHK_BADBLOCKS) {
            retval = check_for_inode_bad_blocks(scan, &num_blocks);
            if (retval)
                  return retval;
      }
            
      if ((scan->scan_flags & EXT2_SF_BAD_INODE_BLK) ||
          (scan->current_block == 0)) {
            memset(scan->inode_buffer, 0,
                   (size_t) num_blocks * scan->fs->blocksize);
      } else {
            retval = io_channel_read_blk(scan->fs->io,
                                   scan->current_block,
                                   (int) num_blocks,
                                   scan->inode_buffer);
            if (retval)
                  return EXT2_ET_NEXT_INODE_READ;
      }
      scan->ptr = scan->inode_buffer;
      scan->bytes_left = num_blocks * scan->fs->blocksize;

      scan->blocks_left -= num_blocks;
      if (scan->current_block)
            scan->current_block += num_blocks;
      return 0;
}

#if 0
/*
 * Returns 1 if the entire inode_buffer has a non-zero size and
 * contains all zeros.  (Not just deleted inodes, since that means
 * that part of the inode table was used at one point; we want all
 * zeros, which means that the inode table is pristine.)
 */
static inline int is_empty_scan(ext2_inode_scan scan)
{
      int   i;
      
      if (scan->bytes_left == 0)
            return 0;

      for (i=0; i < scan->bytes_left; i++)
            if (scan->ptr[i])
                  return 0;
      return 1;
}
#endif

errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino,
                             struct ext2_inode *inode, int bufsize)
{
      errcode_t   retval;
      int         extra_bytes = 0;
      
      EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN);

      /*
       * Do we need to start reading a new block group?
       */
      if (scan->inodes_left <= 0) {
      force_new_group:
            if (scan->done_group) {
                  retval = (scan->done_group)
                        (scan->fs, scan, scan->current_group,
                         scan->done_group_data);
                  if (retval)
                        return retval;
            }
            if (scan->groups_left <= 0) {
                  *ino = 0;
                  return 0;
            }
            retval = get_next_blockgroup(scan);
            if (retval)
                  return retval;
      }
      /*
       * This is done outside the above if statement so that the
       * check can be done for block group #0.
       */
      if (scan->current_block == 0) {
            if (scan->scan_flags & EXT2_SF_SKIP_MISSING_ITABLE) {
                  goto force_new_group;
            } else
                  return EXT2_ET_MISSING_INODE_TABLE;
      }
      

      /*
       * Have we run out of space in the inode buffer?  If so, we
       * need to read in more blocks.
       */
      if (scan->bytes_left < scan->inode_size) {
            memcpy(scan->temp_buffer, scan->ptr, scan->bytes_left);
            extra_bytes = scan->bytes_left;

            retval = get_next_blocks(scan);
            if (retval)
                  return retval;
#if 0
            /*
             * XXX test  Need check for used inode somehow.
             * (Note: this is hard.)
             */
            if (is_empty_scan(scan))
                  goto force_new_group;
#endif
      }

      retval = 0;
      if (extra_bytes) {
            memcpy(scan->temp_buffer+extra_bytes, scan->ptr,
                   scan->inode_size - extra_bytes);
            scan->ptr += scan->inode_size - extra_bytes;
            scan->bytes_left -= scan->inode_size - extra_bytes;

#ifdef EXT2FS_ENABLE_SWAPFS
            if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
                (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
                  ext2fs_swap_inode_full(scan->fs, 
                        (struct ext2_inode_large *) inode,
                        (struct ext2_inode_large *) scan->temp_buffer, 
                        0, bufsize);
            else
#endif
                  *inode = *((struct ext2_inode *) scan->temp_buffer);
            if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES)
                  retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE;
            scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES;
      } else {
#ifdef EXT2FS_ENABLE_SWAPFS
            if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
                (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
                  ext2fs_swap_inode_full(scan->fs, 
                        (struct ext2_inode_large *) inode,
                        (struct ext2_inode_large *) scan->ptr,
                        0, bufsize);
            else
#endif
                  memcpy(inode, scan->ptr, bufsize);
            scan->ptr += scan->inode_size;
            scan->bytes_left -= scan->inode_size;
            if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK)
                  retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE;
      }

      scan->inodes_left--;
      scan->current_inode++;
      *ino = scan->current_inode;
      return retval;
}

errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ext2_ino_t *ino,
                        struct ext2_inode *inode)
{
      return ext2fs_get_next_inode_full(scan, ino, inode,
                                    sizeof(struct ext2_inode));
}

/*
 * Functions to read and write a single inode.
 */
errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino,
                         struct ext2_inode * inode, int bufsize)
{
      unsigned long     group, block, block_nr, offset;
      char        *ptr;
      errcode_t   retval;
      int         clen, i, inodes_per_block, length;
      io_channel  io;

      EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

      /* Check to see if user has an override function */
      if (fs->read_inode) {
            retval = (fs->read_inode)(fs, ino, inode);
            if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
                  return retval;
      }
      /* Create inode cache if not present */
      if (!fs->icache) {
            retval = create_icache(fs);
            if (retval)
                  return retval;
      }
      /* Check to see if it's in the inode cache */
      if (bufsize == sizeof(struct ext2_inode)) {
            /* only old good inode can be retrieve from the cache */
            for (i=0; i < fs->icache->cache_size; i++) {
                  if (fs->icache->cache[i].ino == ino) {
                        *inode = fs->icache->cache[i].inode;
                        return 0;
                  }
            }
      }
      if ((ino == 0) || (ino > fs->super->s_inodes_count))
            return EXT2_ET_BAD_INODE_NUM;
      if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
            inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super);
            block_nr = fs->image_header->offset_inode / fs->blocksize;
            block_nr += (ino - 1) / inodes_per_block;
            offset = ((ino - 1) % inodes_per_block) *
                  EXT2_INODE_SIZE(fs->super);
            io = fs->image_io;
      } else {
            group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
            offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
                  EXT2_INODE_SIZE(fs->super);
            block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
            if (!fs->group_desc[(unsigned)group].bg_inode_table)
                  return EXT2_ET_MISSING_INODE_TABLE;
            block_nr = fs->group_desc[(unsigned)group].bg_inode_table + 
                  block;
            io = fs->io;
      }
      offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);

      length = EXT2_INODE_SIZE(fs->super);
      if (bufsize < length)
            length = bufsize;

      ptr = (char *) inode;
      while (length) {
            clen = length;
            if ((offset + length) > fs->blocksize)
                  clen = fs->blocksize - offset;

            if (block_nr != fs->icache->buffer_blk) {
                  retval = io_channel_read_blk(io, block_nr, 1,
                                         fs->icache->buffer);
                  if (retval)
                        return retval;
                  fs->icache->buffer_blk = block_nr;
            }

            memcpy(ptr, ((char *) fs->icache->buffer) + (unsigned) offset,
                   clen);

            offset = 0;
            length -= clen;
            ptr += clen;
            block_nr++;
      }

#ifdef EXT2FS_ENABLE_SWAPFS
      if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
          (fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
            ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode, 
                               (struct ext2_inode_large *) inode, 
                               0, length);
#endif

      /* Update the inode cache */
      fs->icache->cache_last = (fs->icache->cache_last + 1) %
            fs->icache->cache_size;
      fs->icache->cache[fs->icache->cache_last].ino = ino;
      fs->icache->cache[fs->icache->cache_last].inode = *inode;
      
      return 0;
}

errcode_t ext2fs_read_inode(ext2_filsys fs, ext2_ino_t ino,
                      struct ext2_inode * inode)
{
      return ext2fs_read_inode_full(fs, ino, inode,
                              sizeof(struct ext2_inode));
}

errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino,
                          struct ext2_inode * inode, int bufsize)
{
      unsigned long group, block, block_nr, offset;
      errcode_t retval = 0;
      struct ext2_inode_large temp_inode, *w_inode;
      char *ptr;
      int clen, i, length;

      EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

      /* Check to see if user provided an override function */
      if (fs->write_inode) {
            retval = (fs->write_inode)(fs, ino, inode);
            if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
                  return retval;
      }

      /* Check to see if the inode cache needs to be updated */
      if (fs->icache) {
            for (i=0; i < fs->icache->cache_size; i++) {
                  if (fs->icache->cache[i].ino == ino) {
                        fs->icache->cache[i].inode = *inode;
                        break;
                  }
            }
      } else {
            retval = create_icache(fs);
            if (retval)
                  return retval;
      }
            
      if (!(fs->flags & EXT2_FLAG_RW))
            return EXT2_ET_RO_FILSYS;

      if ((ino == 0) || (ino > fs->super->s_inodes_count))
            return EXT2_ET_BAD_INODE_NUM;

      length = bufsize;
      if (length < EXT2_INODE_SIZE(fs->super))
            length = EXT2_INODE_SIZE(fs->super);

      if (length > (int) sizeof(struct ext2_inode_large)) {
            w_inode = malloc(length);
            if (!w_inode)
                  return ENOMEM;
      } else
            w_inode = &temp_inode;
      memset(w_inode, 0, length);

#ifdef EXT2FS_ENABLE_SWAPFS
      if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
          (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
            ext2fs_swap_inode_full(fs, w_inode, 
                               (struct ext2_inode_large *) inode, 
                               1, bufsize);
      else
#endif
            memcpy(w_inode, inode, bufsize);
      
      group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
      offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
            EXT2_INODE_SIZE(fs->super);
      block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super);
      if (!fs->group_desc[(unsigned) group].bg_inode_table)
            return EXT2_ET_MISSING_INODE_TABLE;
      block_nr = fs->group_desc[(unsigned) group].bg_inode_table + block;

      offset &= (EXT2_BLOCK_SIZE(fs->super) - 1);

      length = EXT2_INODE_SIZE(fs->super);
      if (length > bufsize)
            length = bufsize;

      ptr = (char *) w_inode;

      while (length) {
            clen = length;
            if ((offset + length) > fs->blocksize)
                  clen = fs->blocksize - offset;

            if (fs->icache->buffer_blk != block_nr) {
                  retval = io_channel_read_blk(fs->io, block_nr, 1,
                                         fs->icache->buffer);
                  if (retval)
                        goto errout;
                  fs->icache->buffer_blk = block_nr;
            }

      
            memcpy((char *) fs->icache->buffer + (unsigned) offset, 
                   ptr, clen);

            retval = io_channel_write_blk(fs->io, block_nr, 1, 
                                    fs->icache->buffer);
            if (retval)
                  goto errout;

            offset = 0;
            ptr += clen;
            length -= clen;
            block_nr++;
      }
            
      fs->flags |= EXT2_FLAG_CHANGED;
errout:
      if (w_inode && w_inode != &temp_inode)
            free(w_inode);
      return retval;
}

errcode_t ext2fs_write_inode(ext2_filsys fs, ext2_ino_t ino,
                       struct ext2_inode *inode)
{
      return ext2fs_write_inode_full(fs, ino, inode,
                               sizeof(struct ext2_inode));
}

/* 
 * This function should be called when writing a new inode.  It makes
 * sure that extra part of large inodes is initialized properly.
 */
errcode_t ext2fs_write_new_inode(ext2_filsys fs, ext2_ino_t ino,
                         struct ext2_inode *inode)
{
      struct ext2_inode *buf;
      errcode_t         retval;
      int               size = EXT2_INODE_SIZE(fs->super);
      struct ext2_inode_large *large_inode;

      if (size == sizeof(struct ext2_inode))
            return ext2fs_write_inode_full(fs, ino, inode,
                                     sizeof(struct ext2_inode));

      buf = malloc(size);
      if (!buf)
            return ENOMEM;

      memset(buf, 0, size);
      *buf = *inode;

      large_inode = (struct ext2_inode_large *) buf;
      large_inode->i_extra_isize = sizeof(struct ext2_inode_large) - 
            EXT2_GOOD_OLD_INODE_SIZE;

      retval = ext2fs_write_inode_full(fs, ino, buf, size);
}

 
errcode_t ext2fs_get_blocks(ext2_filsys fs, ext2_ino_t ino, blk_t *blocks)
{
      struct ext2_inode inode;
      int               i;
      errcode_t         retval;
      
      EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

      if (ino > fs->super->s_inodes_count)
            return EXT2_ET_BAD_INODE_NUM;

      if (fs->get_blocks) {
            if (!(*fs->get_blocks)(fs, ino, blocks))
                  return 0;
      }
      retval = ext2fs_read_inode(fs, ino, &inode);
      if (retval)
            return retval;
      for (i=0; i < EXT2_N_BLOCKS; i++)
            blocks[i] = inode.i_block[i];
      return 0;
}

errcode_t ext2fs_check_directory(ext2_filsys fs, ext2_ino_t ino)
{
      struct      ext2_inode  inode;
      errcode_t         retval;
      
      EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

      if (ino > fs->super->s_inodes_count)
            return EXT2_ET_BAD_INODE_NUM;

      if (fs->check_directory) {
            retval = (fs->check_directory)(fs, ino);
            if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
                  return retval;
      }
      retval = ext2fs_read_inode(fs, ino, &inode);
      if (retval)
            return retval;
      if (!LINUX_S_ISDIR(inode.i_mode))
            return EXT2_ET_NO_DIRECTORY;
      return 0;
}


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