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Changeset 9f98578 in mainline


Ignore:
Timestamp:
2011-07-14T07:03:17Z (10 years ago)
Author:
Oleg Romanenko <romanenko.oleg@…>
Branches:
lfn, master
Children:
e584623
Parents:
af4dec0
Message:

exFAT: fat_get_cluster and fat_set_cluster

Location:
uspace/srv/fs/exfat
Files:
2 edited

Legend:

Unmodified
Added
Removed
  • uspace/srv/fs/exfat/exfat_fat.c

    raf4dec0 r9f98578  
    5959
    6060
     61/** Get cluster from the FAT.
     62 *
     63 * @param bs            Buffer holding the boot sector for the file system.
     64 * @param devmap_handle Device handle for the file system.
     65 * @param clst          Cluster which to get.
     66 * @param value         Output argument holding the value of the cluster.
     67 *
     68 * @return              EOK or a negative error code.
     69 */
     70int
     71fat_get_cluster(exfat_bs_t *bs, devmap_handle_t devmap_handle,
     72    exfat_cluster_t clst, exfat_cluster_t *value)
     73{
     74        block_t *b;
     75        aoff64_t offset;
     76        int rc;
     77
     78        offset = clst * sizeof(exfat_cluster_t);
     79
     80        rc = block_get(&b, devmap_handle, FAT_FS(bs) + offset / BPS(bs), BLOCK_FLAGS_NONE);
     81        if (rc != EOK)
     82                return rc;
     83
     84        *value = uint32_t_le2host(*(uint32_t *)(b->data + offset % BPS(bs)));
     85
     86        rc = block_put(b);
     87
     88        return rc;
     89}
     90
     91/** Set cluster in FAT.
     92 *
     93 * @param bs            Buffer holding the boot sector for the file system.
     94 * @param devmap_handle Device handle for the file system.
     95 * @param clst          Cluster which is to be set.
     96 * @param value         Value to set the cluster with.
     97 *
     98 * @return              EOK on success or a negative error code.
     99 */
     100int
     101fat_set_cluster(exfat_bs_t *bs, devmap_handle_t devmap_handle,
     102    exfat_cluster_t clst, exfat_cluster_t value)
     103{
     104        block_t *b;
     105        aoff64_t offset;
     106        int rc;
     107
     108        offset = clst * sizeof(exfat_cluster_t);
     109
     110        rc = block_get(&b, devmap_handle, FAT_FS(bs) + offset / BPS(bs), BLOCK_FLAGS_NONE);
     111        if (rc != EOK)
     112                return rc;
     113
     114        *(uint32_t *)(b->data + offset % BPS(bs)) = host2uint32_t_le(value);
     115
     116        b->dirty = true;        /* need to sync block */
     117        rc = block_put(b);
     118        return rc;
     119}
    61120
    62121/** Perform basic sanity checks on the file system.
  • uspace/srv/fs/exfat/exfat_fat.h

    raf4dec0 r9f98578  
    5757
    5858
     59extern int fat_get_cluster(struct exfat_bs *bs, devmap_handle_t devmap_handle,
     60    exfat_cluster_t clst, exfat_cluster_t *value);
     61extern int fat_set_cluster(struct exfat_bs *bs, devmap_handle_t devmap_handle,
     62    exfat_cluster_t clst, exfat_cluster_t value);
    5963extern int exfat_sanity_check(struct exfat_bs *, devmap_handle_t);
    60 
    6164#endif
    6265
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