C++ (Cpp) sfs_getdirentry_sub_nolock Examples

Example #1

File: sfs_inode.c Project: Aureate-Sunshine/ucore

/*
 * sfs_getdirentry - according to the iob->io_offset, calculate the dir entry's slot in disk block,
                     get dir entry content from the disk
 */
static int
sfs_getdirentry(struct inode *node, struct iobuf *iob) {
    struct sfs_disk_entry *entry;
    if ((entry = kmalloc(sizeof(struct sfs_disk_entry))) == NULL) {
        return -E_NO_MEM;
    }

    struct sfs_fs *sfs = fsop_info(vop_fs(node), sfs);
    struct sfs_inode *sin = vop_info(node, sfs_inode);

    int ret, slot;
    off_t offset = iob->io_offset;
    if (offset < 0 || offset % sfs_dentry_size != 0) {
        kfree(entry);
        return -E_INVAL;
    }
    if ((slot = offset / sfs_dentry_size) > sin->din->blocks) {
        kfree(entry);
        return -E_NOENT;
    }
    lock_sin(sin);
    if ((ret = sfs_getdirentry_sub_nolock(sfs, sin, slot, entry)) != 0) {
        unlock_sin(sin);
        goto out;
    }
    unlock_sin(sin);
    ret = iobuf_move(iob, entry->name, sfs_dentry_size, 1, NULL);
out:
    kfree(entry);
    return ret;
}

Example #2

File: sfs_inode.c Project: geraint0923/ucore_plus

static int
sfs_getdirentry(struct inode *node, struct iobuf *iob) {
    struct sfs_disk_entry *entry;
    if ((entry = kmalloc(sizeof(struct sfs_disk_entry))) == NULL) {
        return -E_NO_MEM;
    }

    struct sfs_fs *sfs = fsop_info(vop_fs(node), sfs);
    struct sfs_inode *sin = vop_info(node, sfs_inode);

    off_t offset = iob->io_offset;
    if (offset < 0 || offset % sfs_dentry_size != 0) {
        kfree(entry);
        return -E_INVAL;
    }

    int ret, slot = offset / sfs_dentry_size;
    if (slot >= sin->din->dirinfo.slots + 2) {
        kfree(entry);
        return -E_NOENT;
    }
    switch (slot) {
    case 0:
        strcpy(entry->name, ".");
        break;
    case 1:
        strcpy(entry->name, "..");
        break;
    default:
        if ((ret = trylock_sin(sin)) != 0) {
            goto out;
        }
        ret = sfs_getdirentry_sub_nolock(sfs, sin, slot - 2, entry);
        unlock_sin(sin);
        if (ret != 0) {
            goto out;
        }
    }
    ret = iobuf_move(iob, entry->name, sfs_dentry_size, 1, NULL);
out:
    kfree(entry);
    return ret;
}

Example #3

File: sfs_inode.c Project: LearningOS/ucore_extension_on_thinpad-2016

static int
sfs_getdirentry(struct inode *node, struct iobuf *iob) {
    struct sfs_disk_entry *entry;
    if ((entry = kmalloc(sizeof(struct sfs_disk_entry))) == NULL) {
        // kprintf("%s %s %d -E_NO_MEM\n", __FILE__, __func__, __LINE__);
        return -E_NO_MEM;
    }

    struct sfs_fs *sfs = fsop_info(vop_fs(node), sfs);
    struct sfs_inode *sin = vop_info(node, sfs_inode);

    int ret, slot;
    off_t offset = iob->io_offset;
    if (offset < 0 || offset % sfs_dentry_size != 0) {
        // kprintf("%s %s %d -E_INVAL\n", __FILE__, __func__, __LINE__);
        kfree(entry);
        return -E_INVAL;
    }
    if ((slot = offset / sfs_dentry_size) > sin->din->blocks) {
        // kprintf("%s %s %d -E_NOENT\n", __FILE__, __func__, __LINE__);
        kfree(entry);
        return -E_NOENT;
    }
    lock_sin(sin);
    if ((ret = sfs_getdirentry_sub_nolock(sfs, sin, slot, entry)) != 0) {
        unlock_sin(sin);
        // kprintf("%s %s %d can not find!!! slot is %d\n", __FILE__, __func__, __LINE__, slot);
        goto out;
    }
    unlock_sin(sin);
    // kprintf("sfs_getdirentry\n");
    ret = iobuf_move(iob, entry->name, sfs_dentry_size, 1, NULL);
out:
    kfree(entry);
    return ret;
}