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inode.c

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * inode.c
 *
 * Inode operations for the OCFS2 userspace library.
 *
 * Copyright (C) 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License, version 2,  as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 *
 * Ideas taken from e2fsprogs/lib/ext2fs/inode.c
 *   Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
 */

#define _XOPEN_SOURCE 600  /* Triggers XOPEN2K in features.h */
#define _LARGEFILE64_SOURCE

#include <string.h>
#include <inttypes.h>

#include "ocfs2.h"


errcode_t ocfs2_check_directory(ocfs2_filesys *fs, uint64_t dir)
{
      struct ocfs2_dinode *inode;
      char *buf;
      errcode_t ret;

      if ((dir < OCFS2_SUPER_BLOCK_BLKNO) ||
          (dir > fs->fs_blocks))
            return OCFS2_ET_BAD_BLKNO;

      ret = ocfs2_malloc_block(fs->fs_io, &buf);
      if (ret)
            return ret;

      ret = ocfs2_read_inode(fs, dir, buf);
      if (ret)
            goto out_buf;

      inode = (struct ocfs2_dinode *)buf;
      if (!S_ISDIR(inode->i_mode))
            ret = OCFS2_ET_NO_DIRECTORY;

out_buf:
      ocfs2_free(&buf);

      return ret;
}

static void ocfs2_swap_inode_third(struct ocfs2_dinode *di)
{

      if (di->i_flags & OCFS2_CHAIN_FL) {
            struct ocfs2_chain_list *cl = &di->id2.i_chain;
            uint16_t i;

            for (i = 0; i < cl->cl_next_free_rec; i++) {
                  struct ocfs2_chain_rec *rec = &cl->cl_recs[i];

                  rec->c_free  = bswap_32(rec->c_free);
                  rec->c_total = bswap_32(rec->c_total);
                  rec->c_blkno = bswap_64(rec->c_blkno);
            }

      } else if (di->i_flags & OCFS2_DEALLOC_FL) {
            struct ocfs2_truncate_log *tl = &di->id2.i_dealloc;
            uint16_t i;

            for(i = 0; i < tl->tl_count; i++) {
                  struct ocfs2_truncate_rec *rec =
                        &tl->tl_recs[i];

                  rec->t_start    = bswap_32(rec->t_start);
                  rec->t_clusters = bswap_32(rec->t_clusters);
            }
      }
}

static void ocfs2_swap_inode_second(struct ocfs2_dinode *di)
{
      if (S_ISCHR(di->i_mode) || S_ISBLK(di->i_mode))
            di->id1.dev1.i_rdev = bswap_64(di->id1.dev1.i_rdev);
      else if (di->i_flags & OCFS2_BITMAP_FL) {
            di->id1.bitmap1.i_used = bswap_32(di->id1.bitmap1.i_used);
            di->id1.bitmap1.i_total = bswap_32(di->id1.bitmap1.i_total);
      } else if (di->i_flags & OCFS2_JOURNAL_FL)
            di->id1.journal1.ij_flags = bswap_32(di->id1.journal1.ij_flags);

      /* we need to be careful to swap the union member that is in use.
       * first the ones that are explicitly marked with flags.. */ 
      if (di->i_flags & OCFS2_SUPER_BLOCK_FL) {
            struct ocfs2_super_block *sb = &di->id2.i_super;

            sb->s_major_rev_level     = bswap_16(sb->s_major_rev_level);
            sb->s_minor_rev_level     = bswap_16(sb->s_minor_rev_level);
            sb->s_mnt_count           = bswap_16(sb->s_mnt_count);
            sb->s_max_mnt_count       = bswap_16(sb->s_max_mnt_count);
            sb->s_state               = bswap_16(sb->s_state);
            sb->s_errors              = bswap_16(sb->s_errors);
            sb->s_checkinterval       = bswap_32(sb->s_checkinterval);
            sb->s_lastcheck           = bswap_64(sb->s_lastcheck);
            sb->s_creator_os          = bswap_32(sb->s_creator_os);
            sb->s_feature_compat      = bswap_32(sb->s_feature_compat);
            sb->s_feature_ro_compat   = bswap_32(sb->s_feature_ro_compat);
            sb->s_feature_incompat    = bswap_32(sb->s_feature_incompat);
            sb->s_root_blkno          = bswap_64(sb->s_root_blkno);
            sb->s_system_dir_blkno    = bswap_64(sb->s_system_dir_blkno);
            sb->s_blocksize_bits      = bswap_32(sb->s_blocksize_bits);
            sb->s_clustersize_bits    = bswap_32(sb->s_clustersize_bits);
            sb->s_max_slots           = bswap_16(sb->s_max_slots);
            sb->s_first_cluster_group = bswap_64(sb->s_first_cluster_group);

      } else if (di->i_flags & OCFS2_LOCAL_ALLOC_FL) {
            struct ocfs2_local_alloc *la = &di->id2.i_lab;

            la->la_bm_off = bswap_32(la->la_bm_off);
            la->la_size   = bswap_16(la->la_size);

      } else if (di->i_flags & OCFS2_CHAIN_FL) {
            struct ocfs2_chain_list *cl = &di->id2.i_chain;

            cl->cl_cpg           = bswap_16(cl->cl_cpg);
            cl->cl_bpc           = bswap_16(cl->cl_bpc);
            cl->cl_count         = bswap_16(cl->cl_count);
            cl->cl_next_free_rec = bswap_16(cl->cl_next_free_rec);

      } else if (di->i_flags & OCFS2_DEALLOC_FL) {
            struct ocfs2_truncate_log *tl = &di->id2.i_dealloc;

            tl->tl_count = bswap_16(tl->tl_count);
            tl->tl_used  = bswap_16(tl->tl_used);
      }
}

static void ocfs2_swap_inode_first(struct ocfs2_dinode *di)
{
      di->i_generation    = bswap_32(di->i_generation);
      di->i_suballoc_slot = bswap_16(di->i_suballoc_slot);
      di->i_suballoc_bit  = bswap_16(di->i_suballoc_bit);
      di->i_clusters      = bswap_32(di->i_clusters);
      di->i_uid           = bswap_32(di->i_uid);
      di->i_gid           = bswap_32(di->i_gid);
      di->i_size          = bswap_64(di->i_size);
      di->i_mode          = bswap_16(di->i_mode);
      di->i_links_count   = bswap_16(di->i_links_count);
      di->i_flags         = bswap_32(di->i_flags);
      di->i_atime         = bswap_64(di->i_atime);
      di->i_ctime         = bswap_64(di->i_ctime);
      di->i_mtime         = bswap_64(di->i_mtime);
      di->i_dtime         = bswap_64(di->i_dtime);
      di->i_blkno         = bswap_64(di->i_blkno);
      di->i_last_eb_blk   = bswap_64(di->i_last_eb_blk);
      di->i_fs_generation = bswap_32(di->i_fs_generation);
      di->i_atime_nsec    = bswap_32(di->i_atime_nsec);
      di->i_ctime_nsec    = bswap_32(di->i_ctime_nsec);
      di->i_mtime_nsec    = bswap_32(di->i_mtime_nsec);
}

static int has_extents(struct ocfs2_dinode *di)
{
      /* inodes flagged with other stuff in id2 */
      if (di->i_flags & (OCFS2_SUPER_BLOCK_FL | OCFS2_LOCAL_ALLOC_FL |
                     OCFS2_CHAIN_FL | OCFS2_DEALLOC_FL))
            return 0;
      /* i_flags doesn't indicate when id2 is a fast symlink */
      if (S_ISLNK(di->i_mode) && di->i_size && di->i_clusters == 0)
            return 0;

      return 1;
}

void ocfs2_swap_inode_from_cpu(struct ocfs2_dinode *di)
{
      if (cpu_is_little_endian)
            return;

      if (has_extents(di))
            ocfs2_swap_extent_list_from_cpu(&di->id2.i_list);
      ocfs2_swap_inode_third(di);
      ocfs2_swap_inode_second(di);
      ocfs2_swap_inode_first(di);
}

void ocfs2_swap_inode_to_cpu(struct ocfs2_dinode *di)
{
      if (cpu_is_little_endian)
            return;

      ocfs2_swap_inode_first(di);
      ocfs2_swap_inode_second(di);
      ocfs2_swap_inode_third(di);
      if (has_extents(di))
            ocfs2_swap_extent_list_to_cpu(&di->id2.i_list);
}

errcode_t ocfs2_read_inode(ocfs2_filesys *fs, uint64_t blkno,
                     char *inode_buf)
{
      errcode_t ret;
      char *blk;
      struct ocfs2_dinode *di;

      if ((blkno < OCFS2_SUPER_BLOCK_BLKNO) ||
          (blkno > fs->fs_blocks))
            return OCFS2_ET_BAD_BLKNO;

      ret = ocfs2_malloc_block(fs->fs_io, &blk);
      if (ret)
            return ret;

      ret = io_read_block(fs->fs_io, blkno, 1, blk);
      if (ret)
            goto out;

      di = (struct ocfs2_dinode *)blk;

      ret = OCFS2_ET_BAD_INODE_MAGIC;
      if (memcmp(di->i_signature, OCFS2_INODE_SIGNATURE,
               strlen(OCFS2_INODE_SIGNATURE)))
            goto out;

      memcpy(inode_buf, blk, fs->fs_blocksize);

      di = (struct ocfs2_dinode *) inode_buf;
      ocfs2_swap_inode_to_cpu(di);

      ret = 0;
out:
      ocfs2_free(&blk);

      return ret;
}

errcode_t ocfs2_write_inode(ocfs2_filesys *fs, uint64_t blkno,
                      char *inode_buf)
{
      errcode_t ret;
      char *blk;
      struct ocfs2_dinode *di;

      if (!(fs->fs_flags & OCFS2_FLAG_RW))
            return OCFS2_ET_RO_FILESYS;

      if ((blkno < OCFS2_SUPER_BLOCK_BLKNO) ||
          (blkno > fs->fs_blocks))
            return OCFS2_ET_BAD_BLKNO;

      ret = ocfs2_malloc_block(fs->fs_io, &blk);
      if (ret)
            return ret;

      memcpy(blk, inode_buf, fs->fs_blocksize);

      di = (struct ocfs2_dinode *)blk;
      ocfs2_swap_inode_from_cpu(di);

      ret = io_write_block(fs->fs_io, blkno, 1, blk);
      if (ret)
            goto out;

      fs->fs_flags |= OCFS2_FLAG_CHANGED;
      ret = 0;

out:
      ocfs2_free(&blk);

      return ret;
}


#ifdef DEBUG_EXE
#include <stdlib.h>

static uint64_t read_number(const char *num)
{
      uint64_t val;
      char *ptr;

      val = strtoull(num, &ptr, 0);
      if (!ptr || *ptr)
            return 0;

      return val;
}

static void print_usage(void)
{
      fprintf(stderr,
            "Usage: inode <filename> <inode_num>\n");
}

extern int opterr, optind;
extern char *optarg;

int main(int argc, char *argv[])
{
      errcode_t ret;
      uint64_t blkno;
      char *filename, *buf;
      ocfs2_filesys *fs;
      struct ocfs2_dinode *di;

      blkno = OCFS2_SUPER_BLOCK_BLKNO;

      initialize_ocfs_error_table();

      if (argc < 2) {
            fprintf(stderr, "Missing filename\n");
            print_usage();
            return 1;
      }
      filename = argv[1];

      if (argc > 2) {
            blkno = read_number(argv[2]);
            if (blkno < OCFS2_SUPER_BLOCK_BLKNO) {
                  fprintf(stderr, "Invalid blockno: %"PRIu64"\n", blkno);
                  print_usage();
                  return 1;
            }
      }

      ret = ocfs2_open(filename, OCFS2_FLAG_RO, 0, 0, &fs);
      if (ret) {
            com_err(argv[0], ret,
                  "while opening file \"%s\"", filename);
            goto out;
      }

      ret = ocfs2_malloc_block(fs->fs_io, &buf);
      if (ret) {
            com_err(argv[0], ret,
                  "while allocating inode buffer");
            goto out_close;
      }


      ret = ocfs2_read_inode(fs, blkno, buf);
      if (ret) {
            com_err(argv[0], ret, "while reading inode %"PRIu64, blkno);
            goto out_free;
      }

      di = (struct ocfs2_dinode *)buf;

      fprintf(stdout, "OCFS2 inode %"PRIu64" on \"%s\"\n", blkno,
            filename);


out_free:
      ocfs2_free(&buf);

out_close:
      ret = ocfs2_close(fs);
      if (ret) {
            com_err(argv[0], ret,
                  "while closing file \"%s\"", filename);
      }

out:
      return 0;
}
#endif  /* DEBUG_EXE */

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