reiserfsprogs/debugreiserfs/recover.c

/*
 * Copyright 2000-2002 by Hans Reiser, licensing governed by reiserfs/README
 */

#include "debugreiserfs.h"


#if 0

/* this reads stdin and recover file of given key:  */
/* the input has to be in the follwong format:
   K dirid objectid
   N name
   B blocknumber
   ..
   then recover_file will read every block, look there specified file and put it into
*/
void do_recover (reiserfs_filsys_t fs)
{
    char name [100];
    char * line = 0;
    int n = 0;
    int fd;
    struct key key = {0, 0, };
    struct buffer_head * bh;
    struct item_head * ih;
    unsigned long block;
    char code;
    loff_t recovered = 0;
    int i, j;
    reiserfs_bitmap_t bitmap;
    int used, not_used;

    bitmap = reiserfs_create_bitmap (SB_BLOCK_COUNT (fs));
    reiserfs_fetch_disk_bitmap (bitmap, fs);
    /* we check how many blocks recoverd items point to are free or used */
    used = 0;
    not_used = 0;

    fd = 0;
    while (getline (&line, &n, stdin) != -1) {
	if (line [0] == '#' || line [0] == '\n')
	    continue;
	switch (line [0]) {
	case 'K':
	    /* get a key of file which is to be recovered */
	    if (sscanf (line, "%c %u %u\n", &code, &key.k_dir_id, &key.k_objectid) != 3) {
		die ("recover_file: wrong input K format");
	    }
	    printf ("Recovering file (%u, %u)\n", key.k_dir_id, key.k_objectid);
	    break;

	case 'N':
	    /* get a file name */
	    recovered = 0;
	    if (sscanf (line, "%c %s\n", &code, name) != 2) {
		die ("recover_file: wrong input N format");
	    }
	    fd = open (name, O_RDWR | O_CREAT | O_EXCL, 0644);
	    if (fd == -1)
		die ("recover_file: could not create file %s: %s",
		     name,strerror (errno));
	    printf ("Recovering file %s..\n", name);
	    break;

	case 'B':
	    if (!fd)
		die ("recover_file: file name is not specified");
	    if (sscanf (line, "%c %lu\n", &code, &block) != 2) {
		die ("recover_file: wrong input B format");
	    }
	    bh = bread (fs->s_dev, block, fs->s_blocksize);
	    if (!bh) {
		printf ("reading block %lu failed\n", block);
		continue;
	    }

	    printf ("working with block %lu..\n", block);

	    ih = B_N_PITEM_HEAD (bh, 0);
	    for (i = 0; i < node_item_number (bh); i ++, ih ++) {
		__u32 * indirect;
		struct buffer_head * tmp_bh;

		if (!is_indirect_ih (ih) || key.k_dir_id != ih->ih_key.k_dir_id ||
		    key.k_objectid != ih->ih_key.k_objectid)
		    continue;

		indirect = (__u32 *)B_I_PITEM (bh, ih);
		for (j = 0; j < I_UNFM_NUM (ih); j ++) {
		    block = le32_to_cpu (indirect [j]);
		    if (!block)
			continue;
		    tmp_bh = bread (fs->s_dev, block, fs->s_blocksize);
		    if (!tmp_bh) {
			printf ("reading block %Lu failed\n", (loff_t)block * fs->s_blocksize);
			continue;
		    }
		    if (lseek64 (fd, get_offset (&ih->ih_key) + j * fs->s_blocksize - 1,
				 SEEK_SET) == (loff_t)-1) {
			printf ("llseek failed to pos %Ld\n", (loff_t)block * fs->s_blocksize);
			brelse (tmp_bh);
			continue;
		    }
		    if (reiserfs_bitmap_test_bit (bitmap, block))
			used ++;
		    else
			not_used ++;
		    /*printf ("block of file %Ld gets block %lu\n",
		      (get_offset (&ih->ih_key) - 1) / fs->s_blocksize + j, block);*/
		    if (write (fd, tmp_bh->b_data, tmp_bh->b_size) != tmp_bh->b_size) {
			printf ("write failed to pos %Ld\n", (loff_t)block * fs->s_blocksize);
			brelse (tmp_bh);
			continue;
		    }
		    recovered += fs->s_blocksize;
		    brelse (tmp_bh);
		}
	    }
	    brelse (bh);
	    break;
	}
    }
    printf ("recover_file: %Ld bytes recovered of file %s, key %u %u, %d blocks are free and %d are used\n",
	    recovered, name, key.k_dir_id, key.k_objectid, not_used, used);
}
#endif



/* read a file containing map of one or more files and either recover
   them or just print info */
static void read_map (FILE * fp)
{
    int i;
    __u32 v32;
    char * buf;
    __u32 ids [4];
    int do_recover = 0;


    buf = 0;
    while (1) {
	if (fread (&v32, sizeof (v32), 1, fp) != 1)
	    break;
	if (v32 != MAP_MAGIC)
	    reiserfs_panic ("read_map: no magic found");

	/* device name length and name itself */
	fread (&v32, sizeof (v32), 1, fp);
	buf = realloc (buf, v32);
	if (!buf)
	    reiserfs_panic ("realloc failed");
	fread (buf, v32, 1, fp);
	reiserfs_warning (stdout, "\"%s\": ", buf);

	/* file name length and name itself*/
	fread (&v32, sizeof (v32), 1, fp);
	buf = realloc (buf, v32);
	if (!buf)
	    reiserfs_panic ("realloc failed");
	fread (buf, v32, 1, fp);

	/* read directory key and poined object key */
	fread (ids, sizeof (ids), 1, fp);
	reiserfs_warning (stdout, "[%K]:\"%s\"-->[%K]\n",
			  &ids[0], buf, &ids[2]);

	/*
	do_recover = user_confirmed (stdout, "recover? (Y):", "Y\n");
	if (do_recover)
	    reiserfs_warning (stderr, "recovering not ready\n");
	*/

	/* how many data blocks are there */
	fread (&v32, sizeof (v32), 1, fp);
	if (v32) {
	    buf = realloc (buf, v32 * 4);
	    if (!buf)
		reiserfs_panic ("realloc failed (%u)", v32);
	    
	    /* read list of data block numbers */
	    fread (buf, 4, v32, fp);
	    
	    if (!do_recover) {
		for (i = 0; i < v32; i ++)
		    reiserfs_warning (stdout, "%d ", ((__u32 *)buf)[i]);
		reiserfs_warning (stdout, "\n");
	    }
	}
	
	/* main tail length */
	fread (&v32, sizeof (v32), 1, fp);
	if (v32) {
	    /* there is tail */
	    buf = realloc (buf, v32);
	    if (!buf)
		reiserfs_panic ("realloc failed");
	    fread (buf, v32, 1, fp);
	    if (!do_recover)
		reiserfs_warning (stdout, "%d bytes long tail\n", v32);
	} else {
	    if (!do_recover)
		reiserfs_warning (stdout, "No tail\n");
	}

	if (fread (&v32, sizeof (v32), 1, fp) != 1)
	    break;
	if (v32 != MAP_END_MAGIC)
	    reiserfs_panic ("read_map: no magic found");
    }

    free (buf);
}


void do_recover (reiserfs_filsys_t * fs)
{
    FILE * fp;

    if (map_file (fs)) {
	fp = fopen (map_file (fs), "r");
	if (fp == 0) {
	    reiserfs_warning (stderr, "do_recover: fopen failed: %m");
	    return;
	}
    } else {
	reiserfs_warning (stderr, "Reading file map from stdin..\n");
	fflush (stderr);
	fp = stdin;
    }

    read_map (fp);

    if (fp != stdin)
	fclose (fp);
    
}