diff options
Diffstat (limited to 'lib/ext2fs/brel_ma.c')
| -rw-r--r-- | lib/ext2fs/brel_ma.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/lib/ext2fs/brel_ma.c b/lib/ext2fs/brel_ma.c new file mode 100644 index 0000000..a12afae --- /dev/null +++ b/lib/ext2fs/brel_ma.c @@ -0,0 +1,199 @@ +/* + * brel_ma.c + * + * Copyright (C) 1996, 1997 Theodore Ts'o. + * + * TODO: rewrite to not use a direct array!!! (Fortunately this + * module isn't really used yet.) + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Library + * General Public License, version 2. + * %End-Header% + */ + +#include "config.h" +#include <fcntl.h> +#include <stdio.h> +#include <string.h> +#if HAVE_UNISTD_H +#include <unistd.h> +#endif +#if HAVE_ERRNO_H +#include <errno.h> +#endif + +#include "ext2_fs.h" +#include "ext2fs.h" +#include "brel.h" + +static errcode_t bma_put(ext2_brel brel, blk64_t old, + struct ext2_block_relocate_entry *ent); +static errcode_t bma_get(ext2_brel brel, blk64_t old, + struct ext2_block_relocate_entry *ent); +static errcode_t bma_start_iter(ext2_brel brel); +static errcode_t bma_next(ext2_brel brel, blk64_t *old, + struct ext2_block_relocate_entry *ent); +static errcode_t bma_move(ext2_brel brel, blk64_t old, blk64_t new); +static errcode_t bma_delete(ext2_brel brel, blk64_t old); +static errcode_t bma_free(ext2_brel brel); + +struct brel_ma { + __u32 magic; + blk64_t max_block; + struct ext2_block_relocate_entry *entries; +}; + +errcode_t ext2fs_brel_memarray_create(char *name, blk64_t max_block, + ext2_brel *new_brel) +{ + ext2_brel brel = 0; + errcode_t retval; + struct brel_ma *ma = 0; + size_t size; + + *new_brel = 0; + + /* + * Allocate memory structures + */ + retval = ext2fs_get_mem(sizeof(struct ext2_block_relocation_table), + &brel); + if (retval) + goto errout; + memset(brel, 0, sizeof(struct ext2_block_relocation_table)); + + retval = ext2fs_get_mem(strlen(name)+1, &brel->name); + if (retval) + goto errout; + strcpy(brel->name, name); + + retval = ext2fs_get_mem(sizeof(struct brel_ma), &ma); + if (retval) + goto errout; + memset(ma, 0, sizeof(struct brel_ma)); + brel->priv_data = ma; + + size = (size_t) (sizeof(struct ext2_block_relocate_entry) * + (max_block+1)); + retval = ext2fs_get_array(max_block+1, + sizeof(struct ext2_block_relocate_entry), &ma->entries); + if (retval) + goto errout; + memset(ma->entries, 0, size); + ma->max_block = max_block; + + /* + * Fill in the brel data structure + */ + brel->put = bma_put; + brel->get = bma_get; + brel->start_iter = bma_start_iter; + brel->next = bma_next; + brel->move = bma_move; + brel->delete = bma_delete; + brel->free = bma_free; + + *new_brel = brel; + return 0; + +errout: + bma_free(brel); + return retval; +} + +static errcode_t bma_put(ext2_brel brel, blk64_t old, + struct ext2_block_relocate_entry *ent) +{ + struct brel_ma *ma; + + ma = brel->priv_data; + if (old > ma->max_block) + return EXT2_ET_INVALID_ARGUMENT; + ma->entries[(unsigned)old] = *ent; + return 0; +} + +static errcode_t bma_get(ext2_brel brel, blk64_t old, + struct ext2_block_relocate_entry *ent) +{ + struct brel_ma *ma; + + ma = brel->priv_data; + if (old > ma->max_block) + return EXT2_ET_INVALID_ARGUMENT; + if (ma->entries[(unsigned)old].new == 0) + return ENOENT; + *ent = ma->entries[old]; + return 0; +} + +static errcode_t bma_start_iter(ext2_brel brel) +{ + brel->current = 0; + return 0; +} + +static errcode_t bma_next(ext2_brel brel, blk64_t *old, + struct ext2_block_relocate_entry *ent) +{ + struct brel_ma *ma; + + ma = brel->priv_data; + while (++brel->current < ma->max_block) { + if (ma->entries[(unsigned)brel->current].new == 0) + continue; + *old = brel->current; + *ent = ma->entries[(unsigned)brel->current]; + return 0; + } + *old = 0; + return 0; +} + +static errcode_t bma_move(ext2_brel brel, blk64_t old, blk64_t new) +{ + struct brel_ma *ma; + + ma = brel->priv_data; + if ((old > ma->max_block) || (new > ma->max_block)) + return EXT2_ET_INVALID_ARGUMENT; + if (ma->entries[(unsigned)old].new == 0) + return ENOENT; + ma->entries[(unsigned)new] = ma->entries[old]; + ma->entries[(unsigned)old].new = 0; + return 0; +} + +static errcode_t bma_delete(ext2_brel brel, blk64_t old) +{ + struct brel_ma *ma; + + ma = brel->priv_data; + if (old > ma->max_block) + return EXT2_ET_INVALID_ARGUMENT; + if (ma->entries[(unsigned)old].new == 0) + return ENOENT; + ma->entries[(unsigned)old].new = 0; + return 0; +} + +static errcode_t bma_free(ext2_brel brel) +{ + struct brel_ma *ma; + + if (!brel) + return 0; + + ma = brel->priv_data; + + if (ma) { + if (ma->entries) + ext2fs_free_mem(&ma->entries); + ext2fs_free_mem(&ma); + } + if (brel->name) + ext2fs_free_mem(&brel->name); + ext2fs_free_mem(&brel); + return 0; +} |