static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
/*
* If we have encountered a bitmap-format file, the size limit
* is smaller than s_maxbytes, which is for extent-mapped files.
*/
if (!(ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
size_t length = iov_length(iov, nr_segs);
if (pos > sbi->s_bitmap_maxbytes)
return -EFBIG;
if (pos + length > sbi->s_bitmap_maxbytes) {
nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
sbi->s_bitmap_maxbytes - pos);
}
}
return generic_file_aio_write(iocb, iov, nr_segs, pos);
}
static int ii_iovec_shorten(struct iov_iter *i, size_t count)
{
struct iovec *iov = (struct iovec *)i->data;
i->nr_segs = iov_shorten(iov, i->nr_segs, count);
i->count = min(i->count, count);
return 0;
}
static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
int unaligned_aio = 0;
int ret;
trace_ext4_file_write(iocb->ki_filp->f_path.dentry, iocb->ki_left);
/*
* If we have encountered a bitmap-format file, the size limit
* is smaller than s_maxbytes, which is for extent-mapped files.
*/
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
size_t length = iov_length(iov, nr_segs);
if ((pos > sbi->s_bitmap_maxbytes ||
(pos == sbi->s_bitmap_maxbytes && length > 0)))
return -EFBIG;
if (pos + length > sbi->s_bitmap_maxbytes) {
nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
sbi->s_bitmap_maxbytes - pos);
}
} else if (unlikely((iocb->ki_filp->f_flags & O_DIRECT) &&
!is_sync_kiocb(iocb))) {
unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);
}
/* Unaligned direct AIO must be serialized; see comment above */
if (unaligned_aio) {
static unsigned long unaligned_warn_time;
/* Warn about this once per day */
if (printk_timed_ratelimit(&unaligned_warn_time, 60*60*24*HZ))
ext4_msg(inode->i_sb, KERN_WARNING,
"Unaligned AIO/DIO on inode %ld by %s; "
"performance will be poor.",
inode->i_ino, current->comm);
mutex_lock(ext4_aio_mutex(inode));
ext4_aiodio_wait(inode);
}
ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
if (unaligned_aio)
mutex_unlock(ext4_aio_mutex(inode));
trace_file_write_done(iocb->ki_filp);
return ret;
}
static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
int unaligned_aio = 0;
int ret;
trace_ext4_file_write(iocb->ki_filp->f_path.dentry, iocb->ki_left);
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
size_t length = iov_length(iov, nr_segs);
if ((pos > sbi->s_bitmap_maxbytes ||
(pos == sbi->s_bitmap_maxbytes && length > 0)))
return -EFBIG;
if (pos + length > sbi->s_bitmap_maxbytes) {
nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
sbi->s_bitmap_maxbytes - pos);
}
} else if (unlikely((iocb->ki_filp->f_flags & O_DIRECT) &&
!is_sync_kiocb(iocb))) {
unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);
}
if (unaligned_aio) {
static unsigned long unaligned_warn_time;
if (printk_timed_ratelimit(&unaligned_warn_time, 60*60*24*HZ))
ext4_msg(inode->i_sb, KERN_WARNING,
"Unaligned AIO/DIO on inode %ld by %s; "
"performance will be poor.",
inode->i_ino, current->comm);
mutex_lock(ext4_aio_mutex(inode));
ext4_aiodio_wait(inode);
}
ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
if (unaligned_aio)
mutex_unlock(ext4_aio_mutex(inode));
return ret;
}
static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
struct sg_io_hdr *hdr, fmode_t mode)
{
unsigned long start_time;
int writing = 0, ret = 0;
struct request *rq;
char sense[SCSI_SENSE_BUFFERSIZE];
struct bio *bio;
if (hdr->interface_id != 'S')
return -EINVAL;
if (hdr->cmd_len > BLK_MAX_CDB)
return -EINVAL;
if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
return -EIO;
if (hdr->dxfer_len)
switch (hdr->dxfer_direction) {
default:
return -EINVAL;
case SG_DXFER_TO_DEV:
writing = 1;
break;
case SG_DXFER_TO_FROM_DEV:
case SG_DXFER_FROM_DEV:
break;
}
rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
if (!rq)
return -ENOMEM;
if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
blk_put_request(rq);
return -EFAULT;
}
if (hdr->iovec_count) {
const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
size_t iov_data_len;
struct sg_iovec *sg_iov;
struct iovec *iov;
int i;
sg_iov = kmalloc(size, GFP_KERNEL);
if (!sg_iov) {
ret = -ENOMEM;
goto out;
}
if (copy_from_user(sg_iov, hdr->dxferp, size)) {
kfree(sg_iov);
ret = -EFAULT;
goto out;
}
/*
* Sum up the vecs, making sure they don't overflow
*/
iov = (struct iovec *) sg_iov;
iov_data_len = 0;
for (i = 0; i < hdr->iovec_count; i++) {
if (iov_data_len + iov[i].iov_len < iov_data_len) {
kfree(sg_iov);
ret = -EINVAL;
goto out;
}
iov_data_len += iov[i].iov_len;
}
/* SG_IO howto says that the shorter of the two wins */
if (hdr->dxfer_len < iov_data_len) {
hdr->iovec_count = iov_shorten(iov,
hdr->iovec_count,
hdr->dxfer_len);
iov_data_len = hdr->dxfer_len;
}
ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
iov_data_len, GFP_KERNEL);
kfree(sg_iov);
} else if (hdr->dxfer_len)
ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
GFP_KERNEL);
if (ret)
goto out;
bio = rq->bio;
memset(sense, 0, sizeof(sense));
rq->sense = sense;
rq->sense_len = 0;
rq->retries = 0;
start_time = jiffies;
/* ignore return value. All information is passed back to caller
* (if he doesn't check that is his problem).
* N.B. a non-zero SCSI status is _not_ necessarily an error.
*/
blk_execute_rq(q, bd_disk, rq, 0);
hdr->duration = jiffies_to_msecs(jiffies - start_time);
return blk_complete_sghdr_rq(rq, hdr, bio);
out:
blk_put_request(rq);
return ret;
}
int main(int argc, char **argv) {
struct ieee154_frame_addr frame_address;
struct lowpan_reconstruct recon;
struct lowpan_ctx ctx;
struct ip6_packet pkt;
char print_buf[256];
int idx = 0, rv;
char c, val;
struct ip_iovec *v, *tail;
//memset(frame, 0, sizeof(frame));
/* read destination */
cur = print_buf;
while ((c = getc(stdin)) != '\n')
*cur++ = c;
*cur++ = '\0';
ieee154_parse(print_buf, &frame_address.ieee_src);
/* read source */
cur = print_buf;
while ((c = getc(stdin)) != '\n')
*cur++ = c;
*cur++ = '\0';
ieee154_parse(print_buf, &frame_address.ieee_dst);
frame_address.ieee_dstpan = 0x22;
v = malloc(sizeof(struct ip_iovec));
v->iov_base = malloc(1500);
v->iov_len = 0;
v->iov_next = NULL;
tail = v;
cur = v->iov_base;
while ((c = getc(stdin)) != EOF) {
c = tolower(c);
if (c >= 'a' && c <= 'f'){
c = c - 'a' + 10;
} else if (c >= '0' && c <= '9') {
c = c - '0';
} else if (c == '\n' || c == '\r') {
if (v->iov_len > 0) {
fprintf(stderr, "Making new (%i)\n", v->iov_len);
struct ip_iovec *v2 = malloc(sizeof(struct ip_iovec));
v2->iov_next = NULL;
v2->iov_len = 0;
v2->iov_base = malloc(1500);
tail->iov_next = v2;
tail = tail->iov_next;
cur = tail->iov_base;
}
continue;
} else
continue;
if (idx++ % 2 == 0) {
*cur |= c << 4;
} else {
*cur++ |= c;
tail->iov_len ++;
}
}
ieee154_print(&frame_address.ieee_src, print_buf, sizeof(print_buf));
fprintf(stderr, "src: %s", print_buf);
ieee154_print(&frame_address.ieee_dst, print_buf, sizeof(print_buf));
fprintf(stderr, " dest: %s\n", print_buf);
//fprintf(stderr, "packet [%li]\n", cur - frame);
//fprint_buffer(stderr, frame, cur - frame);
fprintf(stderr, "\n");
if (iov_len(v) < sizeof(struct ip6_hdr))
return 1;
memset(&ctx, 0, sizeof(ctx));
iov_read(v, 0, sizeof(struct ip6_hdr), &pkt.ip6_hdr);
pkt.ip6_data = iov_shorten(v, sizeof(struct ip6_hdr));
pkt.ip6_hdr.ip6_plen = htons(iov_len(pkt.ip6_data));
// iov_print(v);
while ((rv = lowpan_frag_get(fragment, sizeof(fragment),
&pkt, &frame_address, &ctx)) > 0) {
fragment[0] = rv - 1; /* set the 802.15.4 length */
print_buffer_bare(fragment, rv);
fprintf(stderr, "fragment [%i]\n", rv);
fprint_buffer(stderr, fragment, rv);
printf("\n");
}
}
static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_path.dentry->d_inode;
ssize_t ret;
int err;
/*
* If we have encountered a bitmap-format file, the size limit
* is smaller than s_maxbytes, which is for extent-mapped files.
*/
if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
size_t length = iov_length(iov, nr_segs);
if (pos > sbi->s_bitmap_maxbytes)
return -EFBIG;
if (pos + length > sbi->s_bitmap_maxbytes) {
nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
sbi->s_bitmap_maxbytes - pos);
}
}
ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
/*
* Skip flushing if there was an error, or if nothing was written.
*/
if (ret <= 0)
return ret;
/*
* If the inode is IS_SYNC, or is O_SYNC and we are doing data
* journalling then we need to make sure that we force the transaction
* to disk to keep all metadata uptodate synchronously.
*/
if (file->f_flags & O_SYNC) {
/*
* If we are non-data-journaled, then the dirty data has
* already been flushed to backing store by generic_osync_inode,
* and the inode has been flushed too if there have been any
* modifications other than mere timestamp updates.
*
* Open question --- do we care about flushing timestamps too
* if the inode is IS_SYNC?
*/
if (!ext4_should_journal_data(inode))
return ret;
goto force_commit;
}
/*
* So we know that there has been no forced data flush. If the inode
* is marked IS_SYNC, we need to force one ourselves.
*/
if (!IS_SYNC(inode))
return ret;
/*
* Open question #2 --- should we force data to disk here too? If we
* don't, the only impact is that data=writeback filesystems won't
* flush data to disk automatically on IS_SYNC, only metadata (but
* historically, that is what ext2 has done.)
*/
force_commit:
err = ext4_force_commit(inode->i_sb);
if (err)
return err;
return ret;
}
static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
struct skd_sg_io *sksgio)
{
struct sg_io_hdr *sgp = &sksgio->sg;
int i, acc;
if (!access_ok(VERIFY_WRITE, sksgio->argp, sizeof(sg_io_hdr_t))) {
pr_debug("%s:%s:%d access sg failed %p\n",
skdev->name, __func__, __LINE__, sksgio->argp);
return -EFAULT;
}
if (__copy_from_user(sgp, sksgio->argp, sizeof(sg_io_hdr_t))) {
pr_debug("%s:%s:%d copy_from_user sg failed %p\n",
skdev->name, __func__, __LINE__, sksgio->argp);
return -EFAULT;
}
if (sgp->interface_id != SG_INTERFACE_ID_ORIG) {
pr_debug("%s:%s:%d interface_id invalid 0x%x\n",
skdev->name, __func__, __LINE__, sgp->interface_id);
return -EINVAL;
}
if (sgp->cmd_len > sizeof(sksgio->cdb)) {
pr_debug("%s:%s:%d cmd_len invalid %d\n",
skdev->name, __func__, __LINE__, sgp->cmd_len);
return -EINVAL;
}
if (sgp->iovec_count > 256) {
pr_debug("%s:%s:%d iovec_count invalid %d\n",
skdev->name, __func__, __LINE__, sgp->iovec_count);
return -EINVAL;
}
if (sgp->dxfer_len > (PAGE_SIZE * SKD_N_SG_PER_SPECIAL)) {
pr_debug("%s:%s:%d dxfer_len invalid %d\n",
skdev->name, __func__, __LINE__, sgp->dxfer_len);
return -EINVAL;
}
switch (sgp->dxfer_direction) {
case SG_DXFER_NONE:
acc = -1;
break;
case SG_DXFER_TO_DEV:
acc = VERIFY_READ;
break;
case SG_DXFER_FROM_DEV:
case SG_DXFER_TO_FROM_DEV:
acc = VERIFY_WRITE;
break;
default:
pr_debug("%s:%s:%d dxfer_dir invalid %d\n",
skdev->name, __func__, __LINE__, sgp->dxfer_direction);
return -EINVAL;
}
if (copy_from_user(sksgio->cdb, sgp->cmdp, sgp->cmd_len)) {
pr_debug("%s:%s:%d copy_from_user cmdp failed %p\n",
skdev->name, __func__, __LINE__, sgp->cmdp);
return -EFAULT;
}
if (sgp->mx_sb_len != 0) {
if (!access_ok(VERIFY_WRITE, sgp->sbp, sgp->mx_sb_len)) {
pr_debug("%s:%s:%d access sbp failed %p\n",
skdev->name, __func__, __LINE__, sgp->sbp);
return -EFAULT;
}
}
if (sgp->iovec_count == 0) {
sksgio->iov[0].iov_base = sgp->dxferp;
sksgio->iov[0].iov_len = sgp->dxfer_len;
sksgio->iovcnt = 1;
sksgio->dxfer_len = sgp->dxfer_len;
} else {
struct sg_iovec *iov;
uint nbytes = sizeof(*iov) * sgp->iovec_count;
size_t iov_data_len;
iov = kmalloc(nbytes, GFP_KERNEL);
if (iov == NULL) {
pr_debug("%s:%s:%d alloc iovec failed %d\n",
skdev->name, __func__, __LINE__,
sgp->iovec_count);
return -ENOMEM;
}
sksgio->iov = iov;
sksgio->iovcnt = sgp->iovec_count;
if (copy_from_user(iov, sgp->dxferp, nbytes)) {
pr_debug("%s:%s:%d copy_from_user iovec failed %p\n",
skdev->name, __func__, __LINE__, sgp->dxferp);
return -EFAULT;
}
/*
* Sum up the vecs, making sure they don't overflow
*/
iov_data_len = 0;
for (i = 0; i < sgp->iovec_count; i++) {
if (iov_data_len + iov[i].iov_len < iov_data_len)
return -EINVAL;
iov_data_len += iov[i].iov_len;
}
/* SG_IO howto says that the shorter of the two wins */
if (sgp->dxfer_len < iov_data_len) {
sksgio->iovcnt = iov_shorten((struct iovec *)iov,
sgp->iovec_count,
sgp->dxfer_len);
sksgio->dxfer_len = sgp->dxfer_len;
} else
sksgio->dxfer_len = iov_data_len;
}
if (sgp->dxfer_direction != SG_DXFER_NONE) {
struct sg_iovec *iov = sksgio->iov;
for (i = 0; i < sksgio->iovcnt; i++, iov++) {
if (!access_ok(acc, iov->iov_base, iov->iov_len)) {
pr_debug("%s:%s:%d access data failed %p/%d\n",
skdev->name, __func__, __LINE__,
iov->iov_base, (int)iov->iov_len);
return -EFAULT;
}
}
}
return 0;
}
static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
struct sg_io_hdr *hdr, fmode_t mode)
{
unsigned long start_time;
int writing = 0, ret = 0;
struct request *rq;
char sense[SCSI_SENSE_BUFFERSIZE];
struct bio *bio;
if (hdr->interface_id != 'S')
return -EINVAL;
if (hdr->cmd_len > BLK_MAX_CDB)
return -EINVAL;
if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
return -EIO;
if (hdr->dxfer_len)
switch (hdr->dxfer_direction) {
default:
return -EINVAL;
case SG_DXFER_TO_DEV:
writing = 1;
break;
case SG_DXFER_TO_FROM_DEV:
case SG_DXFER_FROM_DEV:
break;
}
rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
if (!rq)
return -ENOMEM;
if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
blk_put_request(rq);
return -EFAULT;
}
if (hdr->iovec_count) {
const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
size_t iov_data_len;
struct sg_iovec *sg_iov;
struct iovec *iov;
int i;
sg_iov = kmalloc(size, GFP_KERNEL);
if (!sg_iov) {
ret = -ENOMEM;
goto out;
}
if (copy_from_user(sg_iov, hdr->dxferp, size)) {
kfree(sg_iov);
ret = -EFAULT;
goto out;
}
iov = (struct iovec *) sg_iov;
iov_data_len = 0;
for (i = 0; i < hdr->iovec_count; i++) {
if (iov_data_len + iov[i].iov_len < iov_data_len) {
kfree(sg_iov);
ret = -EINVAL;
goto out;
}
iov_data_len += iov[i].iov_len;
}
if (hdr->dxfer_len < iov_data_len) {
hdr->iovec_count = iov_shorten(iov,
hdr->iovec_count,
hdr->dxfer_len);
iov_data_len = hdr->dxfer_len;
}
ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
iov_data_len, GFP_KERNEL);
kfree(sg_iov);
} else if (hdr->dxfer_len)
ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
GFP_KERNEL);
if (ret)
goto out;
bio = rq->bio;
memset(sense, 0, sizeof(sense));
rq->sense = sense;
rq->sense_len = 0;
rq->retries = 0;
start_time = jiffies;
blk_execute_rq(q, bd_disk, rq, 0);
hdr->duration = jiffies_to_msecs(jiffies - start_time);
return blk_complete_sghdr_rq(rq, hdr, bio);
out:
blk_put_request(rq);
return ret;
}