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Merge branch 'for-3.2/drivers' of git://git.kernel.dk/linux-block

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* 'for-3.2/drivers' of git://git.kernel.dk/linux-block: (30 commits)
  virtio-blk: use ida to allocate disk index
  hpsa: add small delay when using PCI Power Management to reset for kump
  cciss: add small delay when using PCI Power Management to reset for kump
  xen/blkback: Fix two races in the handling of barrier requests.
  xen/blkback: Check for proper operation.
  xen/blkback: Fix the inhibition to map pages when discarding sector ranges.
  xen/blkback: Report VBD_WSECT (wr_sect) properly.
  xen/blkback: Support 'feature-barrier' aka old-style BARRIER requests.
  xen-blkfront: plug device number leak in xlblk_init() error path
  xen-blkfront: If no barrier or flush is supported, use invalid operation.
  xen-blkback: use kzalloc() in favor of kmalloc()+memset()
  xen-blkback: fixed indentation and comments
  xen-blkfront: fix a deadlock while handling discard response
  xen-blkfront: Handle discard requests.
  xen-blkback: Implement discard requests ('feature-discard')
  xen-blkfront: add BLKIF_OP_DISCARD and discard request struct
  drivers/block/loop.c: remove unnecessary bdev argument from loop_clr_fd()
  drivers/block/loop.c: emit uevent on auto release
  drivers/block/cpqarray.c: use pci_dev->revision
  loop: always allow userspace partitions and optionally support automatic scanning
  ...

Fic up trivial header file includsion conflict in drivers/block/loop.c
This commit is contained in:
Linus Torvalds
2011-11-04 17:22:14 -07:00
parent b4fdcb02f1 a0eda62552
commit 3d0a8d10cf
18 changed files with 637 additions and 122 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/block/cciss.c
+65 -11
View File
@@ -68,6 +68,10 @@ static int cciss_tape_cmds = 6;
module_param(cciss_tape_cmds, int, 0644);
MODULE_PARM_DESC(cciss_tape_cmds,
"number of commands to allocate for tape devices (default: 6)");
static int cciss_simple_mode;
module_param(cciss_simple_mode, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(cciss_simple_mode,
"Use 'simple mode' rather than 'performant mode'");
static DEFINE_MUTEX(cciss_mutex);
static struct proc_dir_entry *proc_cciss;
@@ -176,6 +180,7 @@ static void cciss_geometry_inquiry(ctlr_info_t *h, int logvol,
unsigned int block_size, InquiryData_struct *inq_buff,
drive_info_struct *drv);
static void __devinit cciss_interrupt_mode(ctlr_info_t *);
static int __devinit cciss_enter_simple_mode(struct ctlr_info *h);
static void start_io(ctlr_info_t *h);
static int sendcmd_withirq(ctlr_info_t *h, __u8 cmd, void *buff, size_t size,
__u8 page_code, unsigned char scsi3addr[],
@@ -388,7 +393,7 @@ static void cciss_seq_show_header(struct seq_file *seq)
h->product_name,
(unsigned long)h->board_id,
h->firm_ver[0], h->firm_ver[1], h->firm_ver[2],
h->firm_ver[3], (unsigned int)h->intr[PERF_MODE_INT],
h->firm_ver[3], (unsigned int)h->intr[h->intr_mode],
h->num_luns,
h->Qdepth, h->commands_outstanding,
h->maxQsinceinit, h->max_outstanding, h->maxSG);
@@ -636,6 +641,18 @@ static ssize_t host_store_rescan(struct device *dev,
}
static DEVICE_ATTR(rescan, S_IWUSR, NULL, host_store_rescan);
static ssize_t host_show_transport_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ctlr_info *h = to_hba(dev);
return snprintf(buf, 20, "%s\n",
h->transMethod & CFGTBL_Trans_Performant ?
"performant" : "simple");
}
static DEVICE_ATTR(transport_mode, S_IRUGO, host_show_transport_mode, NULL);
static ssize_t dev_show_unique_id(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -808,6 +825,7 @@ static DEVICE_ATTR(usage_count, S_IRUGO, cciss_show_usage_count, NULL);
static struct attribute *cciss_host_attrs[] = {
&dev_attr_rescan.attr,
&dev_attr_resettable.attr,
&dev_attr_transport_mode.attr,
NULL
};
@@ -3984,6 +4002,9 @@ static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h)
{
__u32 trans_support;
if (cciss_simple_mode)
return;
dev_dbg(&h->pdev->dev, "Trying to put board into Performant mode\n");
/* Attempt to put controller into performant mode if supported */
/* Does board support performant mode? */
@@ -4081,7 +4102,7 @@ static void __devinit cciss_interrupt_mode(ctlr_info_t *h)
default_int_mode:
#endif /* CONFIG_PCI_MSI */
/* if we get here we're going to use the default interrupt mode */
h->intr[PERF_MODE_INT] = h->pdev->irq;
h->intr[h->intr_mode] = h->pdev->irq;
return;
}
@@ -4341,6 +4362,9 @@ static int __devinit cciss_pci_init(ctlr_info_t *h)
}
cciss_enable_scsi_prefetch(h);
cciss_p600_dma_prefetch_quirk(h);
err = cciss_enter_simple_mode(h);
if (err)
goto err_out_free_res;
cciss_put_controller_into_performant_mode(h);
return 0;
@@ -4533,6 +4557,13 @@ static int cciss_controller_hard_reset(struct pci_dev *pdev,
pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
pmcsr |= PCI_D0;
pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
/*
* The P600 requires a small delay when changing states.
* Otherwise we may think the board did not reset and we bail.
* This for kdump only and is particular to the P600.
*/
msleep(500);
}
return 0;
}
@@ -4843,20 +4874,20 @@ static int cciss_request_irq(ctlr_info_t *h,
irqreturn_t (*intxhandler)(int, void *))
{
if (h->msix_vector || h->msi_vector) {
if (!request_irq(h->intr[PERF_MODE_INT], msixhandler,
if (!request_irq(h->intr[h->intr_mode], msixhandler,
IRQF_DISABLED, h->devname, h))
return 0;
dev_err(&h->pdev->dev, "Unable to get msi irq %d"
" for %s\n", h->intr[PERF_MODE_INT],
" for %s\n", h->intr[h->intr_mode],
h->devname);
return -1;
}
if (!request_irq(h->intr[PERF_MODE_INT], intxhandler,
if (!request_irq(h->intr[h->intr_mode], intxhandler,
IRQF_DISABLED, h->devname, h))
return 0;
dev_err(&h->pdev->dev, "Unable to get irq %d for %s\n",
h->intr[PERF_MODE_INT], h->devname);
h->intr[h->intr_mode], h->devname);
return -1;
}
@@ -4887,7 +4918,7 @@ static void cciss_undo_allocations_after_kdump_soft_reset(ctlr_info_t *h)
{
int ctlr = h->ctlr;
free_irq(h->intr[PERF_MODE_INT], h);
free_irq(h->intr[h->intr_mode], h);
#ifdef CONFIG_PCI_MSI
if (h->msix_vector)
pci_disable_msix(h->pdev);
@@ -4953,6 +4984,7 @@ reinit_after_soft_reset:
h = hba[i];
h->pdev = pdev;
h->busy_initializing = 1;
h->intr_mode = cciss_simple_mode ? SIMPLE_MODE_INT : PERF_MODE_INT;
INIT_LIST_HEAD(&h->cmpQ);
INIT_LIST_HEAD(&h->reqQ);
mutex_init(&h->busy_shutting_down);
@@ -5009,7 +5041,7 @@ reinit_after_soft_reset:
dev_info(&h->pdev->dev, "%s: <0x%x> at PCI %s IRQ %d%s using DAC\n",
h->devname, pdev->device, pci_name(pdev),
h->intr[PERF_MODE_INT], dac ? "" : " not");
h->intr[h->intr_mode], dac ? "" : " not");
if (cciss_allocate_cmd_pool(h))
goto clean4;
@@ -5056,7 +5088,7 @@ reinit_after_soft_reset:
spin_lock_irqsave(&h->lock, flags);
h->access.set_intr_mask(h, CCISS_INTR_OFF);
spin_unlock_irqrestore(&h->lock, flags);
free_irq(h->intr[PERF_MODE_INT], h);
free_irq(h->intr[h->intr_mode], h);
rc = cciss_request_irq(h, cciss_msix_discard_completions,
cciss_intx_discard_completions);
if (rc) {
@@ -5133,7 +5165,7 @@ clean4:
cciss_free_cmd_pool(h);
cciss_free_scatterlists(h);
cciss_free_sg_chain_blocks(h->cmd_sg_list, h->nr_cmds);
free_irq(h->intr[PERF_MODE_INT], h);
free_irq(h->intr[h->intr_mode], h);
clean2:
unregister_blkdev(h->major, h->devname);
clean1:
@@ -5172,9 +5204,31 @@ static void cciss_shutdown(struct pci_dev *pdev)
if (return_code != IO_OK)
dev_warn(&h->pdev->dev, "Error flushing cache\n");
h->access.set_intr_mask(h, CCISS_INTR_OFF);
free_irq(h->intr[PERF_MODE_INT], h);
free_irq(h->intr[h->intr_mode], h);
}
static int __devinit cciss_enter_simple_mode(struct ctlr_info *h)
{
u32 trans_support;
trans_support = readl(&(h->cfgtable->TransportSupport));
if (!(trans_support & SIMPLE_MODE))
return -ENOTSUPP;
h->max_commands = readl(&(h->cfgtable->CmdsOutMax));
writel(CFGTBL_Trans_Simple, &(h->cfgtable->HostWrite.TransportRequest));
writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
cciss_wait_for_mode_change_ack(h);
print_cfg_table(h);
if (!(readl(&(h->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) {
dev_warn(&h->pdev->dev, "unable to get board into simple mode\n");
return -ENODEV;
}
h->transMethod = CFGTBL_Trans_Simple;
return 0;
}
static void __devexit cciss_remove_one(struct pci_dev *pdev)
{
ctlr_info_t *h;
drivers/block/cciss.h
+1
View File
@@ -92,6 +92,7 @@ struct ctlr_info
unsigned int intr[4];
unsigned int msix_vector;
unsigned int msi_vector;
int intr_mode;
int cciss_max_sectors;
BYTE cciss_read;
BYTE cciss_write;
drivers/block/cpqarray.c
+1 -1
View File
@@ -620,6 +620,7 @@ static int cpqarray_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
}
vendor_id = pdev->vendor;
device_id = pdev->device;
revision = pdev->revision;
irq = pdev->irq;
for(i=0; i<6; i++)
@@ -632,7 +633,6 @@ static int cpqarray_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
}
pci_read_config_word(pdev, PCI_COMMAND, &command);
pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &cache_line_size);
pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency_timer);
drivers/block/loop.c
+104 -7
View File
@@ -76,6 +76,8 @@
#include <linux/splice.h>
#include <linux/sysfs.h>
#include <linux/miscdevice.h>
#include <linux/falloc.h>
#include <asm/uaccess.h>
static DEFINE_IDR(loop_index_idr);
@@ -407,6 +409,29 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
}
}
/*
* We use punch hole to reclaim the free space used by the
* image a.k.a. discard. However we do support discard if
* encryption is enabled, because it may give an attacker
* useful information.
*/
if (bio->bi_rw & REQ_DISCARD) {
struct file *file = lo->lo_backing_file;
int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
if ((!file->f_op->fallocate) ||
lo->lo_encrypt_key_size) {
ret = -EOPNOTSUPP;
goto out;
}
ret = file->f_op->fallocate(file, mode, pos,
bio->bi_size);
if (unlikely(ret && ret != -EINVAL &&
ret != -EOPNOTSUPP))
ret = -EIO;
goto out;
}
ret = lo_send(lo, bio, pos);
if ((bio->bi_rw & REQ_FUA) && !ret) {
@@ -622,7 +647,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
goto out_putf;
fput(old_file);
if (max_part > 0)
if (lo->lo_flags & LO_FLAGS_PARTSCAN)
ioctl_by_bdev(bdev, BLKRRPART, 0);
return 0;
@@ -699,16 +724,25 @@ static ssize_t loop_attr_autoclear_show(struct loop_device *lo, char *buf)
return sprintf(buf, "%s\n", autoclear ? "1" : "0");
}
static ssize_t loop_attr_partscan_show(struct loop_device *lo, char *buf)
{
int partscan = (lo->lo_flags & LO_FLAGS_PARTSCAN);
return sprintf(buf, "%s\n", partscan ? "1" : "0");
}
LOOP_ATTR_RO(backing_file);
LOOP_ATTR_RO(offset);
LOOP_ATTR_RO(sizelimit);
LOOP_ATTR_RO(autoclear);
LOOP_ATTR_RO(partscan);
static struct attribute *loop_attrs[] = {
&loop_attr_backing_file.attr,
&loop_attr_offset.attr,
&loop_attr_sizelimit.attr,
&loop_attr_autoclear.attr,
&loop_attr_partscan.attr,
NULL,
};
@@ -729,6 +763,35 @@ static void loop_sysfs_exit(struct loop_device *lo)
&loop_attribute_group);
}
static void loop_config_discard(struct loop_device *lo)
{
struct file *file = lo->lo_backing_file;
struct inode *inode = file->f_mapping->host;
struct request_queue *q = lo->lo_queue;
/*
* We use punch hole to reclaim the free space used by the
* image a.k.a. discard. However we do support discard if
* encryption is enabled, because it may give an attacker
* useful information.
*/
if ((!file->f_op->fallocate) ||
lo->lo_encrypt_key_size) {
q->limits.discard_granularity = 0;
q->limits.discard_alignment = 0;
q->limits.max_discard_sectors = 0;
q->limits.discard_zeroes_data = 0;
queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
return;
}
q->limits.discard_granularity = inode->i_sb->s_blocksize;
q->limits.discard_alignment = inode->i_sb->s_blocksize;
q->limits.max_discard_sectors = UINT_MAX >> 9;
q->limits.discard_zeroes_data = 1;
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
}
static int loop_set_fd(struct loop_device *lo, fmode_t mode,
struct block_device *bdev, unsigned int arg)
{
@@ -829,7 +892,9 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
}
lo->lo_state = Lo_bound;
wake_up_process(lo->lo_thread);
if (max_part > 0)
if (part_shift)
lo->lo_flags |= LO_FLAGS_PARTSCAN;
if (lo->lo_flags & LO_FLAGS_PARTSCAN)
ioctl_by_bdev(bdev, BLKRRPART, 0);
return 0;
@@ -890,10 +955,11 @@ loop_init_xfer(struct loop_device *lo, struct loop_func_table *xfer,
return err;
}
static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
static int loop_clr_fd(struct loop_device *lo)
{
struct file *filp = lo->lo_backing_file;
gfp_t gfp = lo->old_gfp_mask;
struct block_device *bdev = lo->lo_device;
if (lo->lo_state != Lo_bound)
return -ENXIO;
@@ -922,7 +988,6 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
lo->lo_offset = 0;
lo->lo_sizelimit = 0;
lo->lo_encrypt_key_size = 0;
lo->lo_flags = 0;
lo->lo_thread = NULL;
memset(lo->lo_encrypt_key, 0, LO_KEY_SIZE);
memset(lo->lo_crypt_name, 0, LO_NAME_SIZE);
@@ -940,8 +1005,11 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
lo->lo_state = Lo_unbound;
/* This is safe: open() is still holding a reference. */
module_put(THIS_MODULE);
if (max_part > 0 && bdev)
if (lo->lo_flags & LO_FLAGS_PARTSCAN && bdev)
ioctl_by_bdev(bdev, BLKRRPART, 0);
lo->lo_flags = 0;
if (!part_shift)
lo->lo_disk->flags |= GENHD_FL_NO_PART_SCAN;
mutex_unlock(&lo->lo_ctl_mutex);
/*
* Need not hold lo_ctl_mutex to fput backing file.
@@ -995,6 +1063,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
if (figure_loop_size(lo))
return -EFBIG;
}
loop_config_discard(lo);
memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);
memcpy(lo->lo_crypt_name, info->lo_crypt_name, LO_NAME_SIZE);
@@ -1010,6 +1079,13 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
(info->lo_flags & LO_FLAGS_AUTOCLEAR))
lo->lo_flags ^= LO_FLAGS_AUTOCLEAR;
if ((info->lo_flags & LO_FLAGS_PARTSCAN) &&
!(lo->lo_flags & LO_FLAGS_PARTSCAN)) {
lo->lo_flags |= LO_FLAGS_PARTSCAN;
lo->lo_disk->flags &= ~GENHD_FL_NO_PART_SCAN;
ioctl_by_bdev(lo->lo_device, BLKRRPART, 0);
}
lo->lo_encrypt_key_size = info->lo_encrypt_key_size;
lo->lo_init[0] = info->lo_init[0];
lo->lo_init[1] = info->lo_init[1];
@@ -1203,7 +1279,7 @@ static int lo_ioctl(struct block_device *bdev, fmode_t mode,
break;
case LOOP_CLR_FD:
/* loop_clr_fd would have unlocked lo_ctl_mutex on success */
err = loop_clr_fd(lo, bdev);
err = loop_clr_fd(lo);
if (!err)
goto out_unlocked;
break;
@@ -1423,7 +1499,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
* In autoclear mode, stop the loop thread
* and remove configuration after last close.
*/
err = loop_clr_fd(lo, NULL);
err = loop_clr_fd(lo);
if (!err)
goto out_unlocked;
} else {
@@ -1545,6 +1621,27 @@ static int loop_add(struct loop_device **l, int i)
if (!disk)
goto out_free_queue;
/*
* Disable partition scanning by default. The in-kernel partition
* scanning can be requested individually per-device during its
* setup. Userspace can always add and remove partitions from all
* devices. The needed partition minors are allocated from the
* extended minor space, the main loop device numbers will continue
* to match the loop minors, regardless of the number of partitions
* used.
*
* If max_part is given, partition scanning is globally enabled for
* all loop devices. The minors for the main loop devices will be
* multiples of max_part.
*
* Note: Global-for-all-devices, set-only-at-init, read-only module
* parameteters like 'max_loop' and 'max_part' make things needlessly
* complicated, are too static, inflexible and may surprise
* userspace tools. Parameters like this in general should be avoided.
*/
if (!part_shift)
disk->flags |= GENHD_FL_NO_PART_SCAN;
disk->flags |= GENHD_FL_EXT_DEVT;
mutex_init(&lo->lo_ctl_mutex);
lo->lo_number = i;
lo->lo_thread = NULL;
drivers/block/nbd.c
+34 -35
View File
@@ -127,8 +127,7 @@ static void sock_shutdown(struct nbd_device *lo, int lock)
if (lock)
mutex_lock(&lo->tx_lock);
if (lo->sock) {
printk(KERN_WARNING "%s: shutting down socket\n",
lo->disk->disk_name);
dev_warn(disk_to_dev(lo->disk), "shutting down socket\n");
kernel_sock_shutdown(lo->sock, SHUT_RDWR);
lo->sock = NULL;
}
@@ -158,8 +157,9 @@ static int sock_xmit(struct nbd_device *lo, int send, void *buf, int size,
sigset_t blocked, oldset;
if (unlikely(!sock)) {
printk(KERN_ERR "%s: Attempted %s on closed socket in sock_xmit\n",
lo->disk->disk_name, (send ? "send" : "recv"));
dev_err(disk_to_dev(lo->disk),
"Attempted %s on closed socket in sock_xmit\n",
(send ? "send" : "recv"));
return -EINVAL;
}
@@ -250,8 +250,8 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
result = sock_xmit(lo, 1, &request, sizeof(request),
(nbd_cmd(req) == NBD_CMD_WRITE) ? MSG_MORE : 0);
if (result <= 0) {
printk(KERN_ERR "%s: Send control failed (result %d)\n",
lo->disk->disk_name, result);
dev_err(disk_to_dev(lo->disk),
"Send control failed (result %d)\n", result);
goto error_out;
}
@@ -270,8 +270,9 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
lo->disk->disk_name, req, bvec->bv_len);
result = sock_send_bvec(lo, bvec, flags);
if (result <= 0) {
printk(KERN_ERR "%s: Send data failed (result %d)\n",
lo->disk->disk_name, result);
dev_err(disk_to_dev(lo->disk),
"Send data failed (result %d)\n",
result);
goto error_out;
}
}
@@ -328,14 +329,13 @@ static struct request *nbd_read_stat(struct nbd_device *lo)
reply.magic = 0;
result = sock_xmit(lo, 0, &reply, sizeof(reply), MSG_WAITALL);
if (result <= 0) {
printk(KERN_ERR "%s: Receive control failed (result %d)\n",
lo->disk->disk_name, result);
dev_err(disk_to_dev(lo->disk),
"Receive control failed (result %d)\n", result);
goto harderror;
}
if (ntohl(reply.magic) != NBD_REPLY_MAGIC) {
printk(KERN_ERR "%s: Wrong magic (0x%lx)\n",
lo->disk->disk_name,
dev_err(disk_to_dev(lo->disk), "Wrong magic (0x%lx)\n",
(unsigned long)ntohl(reply.magic));
result = -EPROTO;
goto harderror;
@@ -347,15 +347,15 @@ static struct request *nbd_read_stat(struct nbd_device *lo)
if (result != -ENOENT)
goto harderror;
printk(KERN_ERR "%s: Unexpected reply (%p)\n",
lo->disk->disk_name, reply.handle);
dev_err(disk_to_dev(lo->disk), "Unexpected reply (%p)\n",
reply.handle);
result = -EBADR;
goto harderror;
}
if (ntohl(reply.error)) {
printk(KERN_ERR "%s: Other side returned error (%d)\n",
lo->disk->disk_name, ntohl(reply.error));
dev_err(disk_to_dev(lo->disk), "Other side returned error (%d)\n",
ntohl(reply.error));
req->errors++;
return req;
}
@@ -369,8 +369,8 @@ static struct request *nbd_read_stat(struct nbd_device *lo)
rq_for_each_segment(bvec, req, iter) {
result = sock_recv_bvec(lo, bvec);
if (result <= 0) {
printk(KERN_ERR "%s: Receive data failed (result %d)\n",
lo->disk->disk_name, result);
dev_err(disk_to_dev(lo->disk), "Receive data failed (result %d)\n",
result);
req->errors++;
return req;
}
@@ -405,10 +405,10 @@ static int nbd_do_it(struct nbd_device *lo)
BUG_ON(lo->magic != LO_MAGIC);
lo->pid = current->pid;
ret = sysfs_create_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr);
lo->pid = task_pid_nr(current);
ret = device_create_file(disk_to_dev(lo->disk), &pid_attr);
if (ret) {
printk(KERN_ERR "nbd: sysfs_create_file failed!");
dev_err(disk_to_dev(lo->disk), "device_create_file failed!\n");
lo->pid = 0;
return ret;
}
@@ -416,7 +416,7 @@ static int nbd_do_it(struct nbd_device *lo)
while ((req = nbd_read_stat(lo)) != NULL)
nbd_end_request(req);
sysfs_remove_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr);
device_remove_file(disk_to_dev(lo->disk), &pid_attr);
lo->pid = 0;
return 0;
}
@@ -457,8 +457,8 @@ static void nbd_handle_req(struct nbd_device *lo, struct request *req)
if (rq_data_dir(req) == WRITE) {
nbd_cmd(req) = NBD_CMD_WRITE;
if (lo->flags & NBD_READ_ONLY) {
printk(KERN_ERR "%s: Write on read-only\n",
lo->disk->disk_name);
dev_err(disk_to_dev(lo->disk),
"Write on read-only\n");
goto error_out;
}
}
@@ -468,16 +468,15 @@ static void nbd_handle_req(struct nbd_device *lo, struct request *req)
mutex_lock(&lo->tx_lock);
if (unlikely(!lo->sock)) {
mutex_unlock(&lo->tx_lock);
printk(KERN_ERR "%s: Attempted send on closed socket\n",
lo->disk->disk_name);
dev_err(disk_to_dev(lo->disk),
"Attempted send on closed socket\n");
goto error_out;
}
lo->active_req = req;
if (nbd_send_req(lo, req) != 0) {
printk(KERN_ERR "%s: Request send failed\n",
lo->disk->disk_name);
dev_err(disk_to_dev(lo->disk), "Request send failed\n");
req->errors++;
nbd_end_request(req);
} else {
@@ -549,8 +548,8 @@ static void do_nbd_request(struct request_queue *q)
BUG_ON(lo->magic != LO_MAGIC);
if (unlikely(!lo->sock)) {
printk(KERN_ERR "%s: Attempted send on closed socket\n",
lo->disk->disk_name);
dev_err(disk_to_dev(lo->disk),
"Attempted send on closed socket\n");
req->errors++;
nbd_end_request(req);
spin_lock_irq(q->queue_lock);
@@ -576,7 +575,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
case NBD_DISCONNECT: {
struct request sreq;
printk(KERN_INFO "%s: NBD_DISCONNECT\n", lo->disk->disk_name);
dev_info(disk_to_dev(lo->disk), "NBD_DISCONNECT\n");
blk_rq_init(NULL, &sreq);
sreq.cmd_type = REQ_TYPE_SPECIAL;
@@ -674,7 +673,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
file = lo->file;
lo->file = NULL;
nbd_clear_que(lo);
printk(KERN_WARNING "%s: queue cleared\n", lo->disk->disk_name);
dev_warn(disk_to_dev(lo->disk), "queue cleared\n");
if (file)
fput(file);
lo->bytesize = 0;
@@ -694,8 +693,8 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
return 0;
case NBD_PRINT_DEBUG:
printk(KERN_INFO "%s: next = %p, prev = %p, head = %p\n",
bdev->bd_disk->disk_name,
dev_info(disk_to_dev(lo->disk),
"next = %p, prev = %p, head = %p\n",
lo->queue_head.next, lo->queue_head.prev,
&lo->queue_head);
return 0;
@@ -745,7 +744,7 @@ static int __init nbd_init(void)
BUILD_BUG_ON(sizeof(struct nbd_request) != 28);
if (max_part < 0) {
printk(KERN_CRIT "nbd: max_part must be >= 0\n");
printk(KERN_ERR "nbd: max_part must be >= 0\n");
return -EINVAL;
}
drivers/block/xen-blkback/blkback.c
+109 -21
View File
@@ -39,6 +39,9 @@
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/loop.h>
#include <linux/falloc.h>
#include <linux/fs.h>
#include <xen/events.h>
#include <xen/page.h>
@@ -258,13 +261,16 @@ irqreturn_t xen_blkif_be_int(int irq, void *dev_id)
static void print_stats(struct xen_blkif *blkif)
{
pr_info("xen-blkback (%s): oo %3d | rd %4d | wr %4d | f %4d\n",
pr_info("xen-blkback (%s): oo %3d | rd %4d | wr %4d | f %4d"
" | ds %4d\n",
current->comm, blkif->st_oo_req,
blkif->st_rd_req, blkif->st_wr_req, blkif->st_f_req);
blkif->st_rd_req, blkif->st_wr_req,
blkif->st_f_req, blkif->st_ds_req);
blkif->st_print = jiffies + msecs_to_jiffies(10 * 1000);
blkif->st_rd_req = 0;
blkif->st_wr_req = 0;
blkif->st_oo_req = 0;
blkif->st_ds_req = 0;
}
int xen_blkif_schedule(void *arg)
@@ -410,6 +416,59 @@ static int xen_blkbk_map(struct blkif_request *req,
return ret;
}
static void xen_blk_discard(struct xen_blkif *blkif, struct blkif_request *req)
{
int err = 0;
int status = BLKIF_RSP_OKAY;
struct block_device *bdev = blkif->vbd.bdev;
if (blkif->blk_backend_type == BLKIF_BACKEND_PHY)
/* just forward the discard request */
err = blkdev_issue_discard(bdev,
req->u.discard.sector_number,
req->u.discard.nr_sectors,
GFP_KERNEL, 0);
else if (blkif->blk_backend_type == BLKIF_BACKEND_FILE) {
/* punch a hole in the backing file */
struct loop_device *lo = bdev->bd_disk->private_data;
struct file *file = lo->lo_backing_file;
if (file->f_op->fallocate)
err = file->f_op->fallocate(file,
FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
req->u.discard.sector_number << 9,
req->u.discard.nr_sectors << 9);
else
err = -EOPNOTSUPP;
} else
err = -EOPNOTSUPP;
if (err == -EOPNOTSUPP) {
pr_debug(DRV_PFX "discard op failed, not supported\n");
status = BLKIF_RSP_EOPNOTSUPP;
} else if (err)
status = BLKIF_RSP_ERROR;
make_response(blkif, req->id, req->operation, status);
}
static void xen_blk_drain_io(struct xen_blkif *blkif)
{
atomic_set(&blkif->drain, 1);
do {
/* The initial value is one, and one refcnt taken at the
* start of the xen_blkif_schedule thread. */
if (atomic_read(&blkif->refcnt) <= 2)
break;
wait_for_completion_interruptible_timeout(
&blkif->drain_complete, HZ);
if (!atomic_read(&blkif->drain))
break;
} while (!kthread_should_stop());
atomic_set(&blkif->drain, 0);
}
/*
* Completion callback on the bio's. Called as bh->b_end_io()
*/
@@ -422,6 +481,11 @@ static void __end_block_io_op(struct pending_req *pending_req, int error)
pr_debug(DRV_PFX "flush diskcache op failed, not supported\n");
xen_blkbk_flush_diskcache(XBT_NIL, pending_req->blkif->be, 0);
pending_req->status = BLKIF_RSP_EOPNOTSUPP;
} else if ((pending_req->operation == BLKIF_OP_WRITE_BARRIER) &&
(error == -EOPNOTSUPP)) {
pr_debug(DRV_PFX "write barrier op failed, not supported\n");
xen_blkbk_barrier(XBT_NIL, pending_req->blkif->be, 0);
pending_req->status = BLKIF_RSP_EOPNOTSUPP;
} else if (error) {
pr_debug(DRV_PFX "Buffer not up-to-date at end of operation,"
" error=%d\n", error);
@@ -438,6 +502,10 @@ static void __end_block_io_op(struct pending_req *pending_req, int error)
make_response(pending_req->blkif, pending_req->id,
pending_req->operation, pending_req->status);
xen_blkif_put(pending_req->blkif);
if (atomic_read(&pending_req->blkif->refcnt) <= 2) {
if (atomic_read(&pending_req->blkif->drain))
complete(&pending_req->blkif->drain_complete);
}
free_req(pending_req);
}
}
@@ -532,7 +600,6 @@ do_block_io_op(struct xen_blkif *blkif)
return more_to_do;
}
/*
* Transmutation of the 'struct blkif_request' to a proper 'struct bio'
* and call the 'submit_bio' to pass it to the underlying storage.
@@ -549,6 +616,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
int i, nbio = 0;
int operation;
struct blk_plug plug;
bool drain = false;
switch (req->operation) {
case BLKIF_OP_READ:
@@ -559,11 +627,16 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
blkif->st_wr_req++;
operation = WRITE_ODIRECT;
break;
case BLKIF_OP_WRITE_BARRIER:
drain = true;
case BLKIF_OP_FLUSH_DISKCACHE:
blkif->st_f_req++;
operation = WRITE_FLUSH;
break;
case BLKIF_OP_WRITE_BARRIER:
case BLKIF_OP_DISCARD:
blkif->st_ds_req++;
operation = REQ_DISCARD;
break;
default:
operation = 0; /* make gcc happy */
goto fail_response;
@@ -572,7 +645,8 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
/* Check that the number of segments is sane. */
nseg = req->nr_segments;
if (unlikely(nseg == 0 && operation != WRITE_FLUSH) ||
if (unlikely(nseg == 0 && operation != WRITE_FLUSH &&
operation != REQ_DISCARD) ||
unlikely(nseg > BLKIF_MAX_SEGMENTS_PER_REQUEST)) {
pr_debug(DRV_PFX "Bad number of segments in request (%d)\n",
nseg);
@@ -621,16 +695,25 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
}
}
/* Wait on all outstanding I/O's and once that has been completed
* issue the WRITE_FLUSH.
*/
if (drain)
xen_blk_drain_io(pending_req->blkif);
/*
* If we have failed at this point, we need to undo the M2P override,
* set gnttab_set_unmap_op on all of the grant references and perform
* the hypercall to unmap the grants - that is all done in
* xen_blkbk_unmap.
*/
if (xen_blkbk_map(req, pending_req, seg))
if (operation != REQ_DISCARD && xen_blkbk_map(req, pending_req, seg))
goto fail_flush;
/* This corresponding xen_blkif_put is done in __end_block_io_op */
/*
* This corresponding xen_blkif_put is done in __end_block_io_op, or
* below (in "!bio") if we are handling a BLKIF_OP_DISCARD.
*/
xen_blkif_get(blkif);
for (i = 0; i < nseg; i++) {
@@ -654,18 +737,25 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
preq.sector_number += seg[i].nsec;
}
/* This will be hit if the operation was a flush. */
/* This will be hit if the operation was a flush or discard. */
if (!bio) {
BUG_ON(operation != WRITE_FLUSH);
BUG_ON(operation != WRITE_FLUSH && operation != REQ_DISCARD);
bio = bio_alloc(GFP_KERNEL, 0);
if (unlikely(bio == NULL))
goto fail_put_bio;
if (operation == WRITE_FLUSH) {
bio = bio_alloc(GFP_KERNEL, 0);
if (unlikely(bio == NULL))
goto fail_put_bio;
biolist[nbio++] = bio;
bio->bi_bdev = preq.bdev;
bio->bi_private = pending_req;
bio->bi_end_io = end_block_io_op;
biolist[nbio++] = bio;
bio->bi_bdev = preq.bdev;
bio->bi_private = pending_req;
bio->bi_end_io = end_block_io_op;
} else if (operation == REQ_DISCARD) {
xen_blk_discard(blkif, req);
xen_blkif_put(blkif);
free_req(pending_req);
return 0;
}
}
/*
@@ -685,7 +775,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
if (operation == READ)
blkif->st_rd_sect += preq.nr_sects;
else if (operation == WRITE || operation == WRITE_FLUSH)
else if (operation & WRITE)
blkif->st_wr_sect += preq.nr_sects;
return 0;
@@ -765,9 +855,9 @@ static int __init xen_blkif_init(void)
mmap_pages = xen_blkif_reqs * BLKIF_MAX_SEGMENTS_PER_REQUEST;
blkbk->pending_reqs = kmalloc(sizeof(blkbk->pending_reqs[0]) *
blkbk->pending_reqs = kzalloc(sizeof(blkbk->pending_reqs[0]) *
xen_blkif_reqs, GFP_KERNEL);
blkbk->pending_grant_handles = kzalloc(sizeof(blkbk->pending_grant_handles[0]) *
blkbk->pending_grant_handles = kmalloc(sizeof(blkbk->pending_grant_handles[0]) *
mmap_pages, GFP_KERNEL);
blkbk->pending_pages = kzalloc(sizeof(blkbk->pending_pages[0]) *
mmap_pages, GFP_KERNEL);
@@ -790,8 +880,6 @@ static int __init xen_blkif_init(void)
if (rc)
goto failed_init;
memset(blkbk->pending_reqs, 0, sizeof(blkbk->pending_reqs));
INIT_LIST_HEAD(&blkbk->pending_free);
spin_lock_init(&blkbk->pending_free_lock);
init_waitqueue_head(&blkbk->pending_free_wq);
drivers/block/xen-blkback/common.h
+81 -17
View File
@@ -62,13 +62,26 @@ struct blkif_common_response {
/* i386 protocol version */
#pragma pack(push, 4)
struct blkif_x86_32_request_rw {
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
};
struct blkif_x86_32_request_discard {
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
uint64_t nr_sectors;
};
struct blkif_x86_32_request {
uint8_t operation; /* BLKIF_OP_??? */
uint8_t nr_segments; /* number of segments */
blkif_vdev_t handle; /* only for read/write requests */
uint64_t id; /* private guest value, echoed in resp */
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
union {
struct blkif_x86_32_request_rw rw;
struct blkif_x86_32_request_discard discard;
} u;
};
struct blkif_x86_32_response {
uint64_t id; /* copied from request */
@@ -78,13 +91,26 @@ struct blkif_x86_32_response {
#pragma pack(pop)
/* x86_64 protocol version */
struct blkif_x86_64_request_rw {
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
};
struct blkif_x86_64_request_discard {
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
uint64_t nr_sectors;
};
struct blkif_x86_64_request {
uint8_t operation; /* BLKIF_OP_??? */
uint8_t nr_segments; /* number of segments */
blkif_vdev_t handle; /* only for read/write requests */
uint64_t __attribute__((__aligned__(8))) id;
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
union {
struct blkif_x86_64_request_rw rw;
struct blkif_x86_64_request_discard discard;
} u;
};
struct blkif_x86_64_response {
uint64_t __attribute__((__aligned__(8))) id;
@@ -112,6 +138,11 @@ enum blkif_protocol {
BLKIF_PROTOCOL_X86_64 = 3,
};
enum blkif_backend_type {
BLKIF_BACKEND_PHY = 1,
BLKIF_BACKEND_FILE = 2,
};
struct xen_vbd {
/* What the domain refers to this vbd as. */
blkif_vdev_t handle;
@@ -137,6 +168,7 @@ struct xen_blkif {
unsigned int irq;
/* Comms information. */
enum blkif_protocol blk_protocol;
enum blkif_backend_type blk_backend_type;
union blkif_back_rings blk_rings;
struct vm_struct *blk_ring_area;
/* The VBD attached to this interface. */
@@ -148,6 +180,9 @@ struct xen_blkif {
atomic_t refcnt;
wait_queue_head_t wq;
/* for barrier (drain) requests */
struct completion drain_complete;
atomic_t drain;
/* One thread per one blkif. */
struct task_struct *xenblkd;
unsigned int waiting_reqs;
@@ -158,6 +193,7 @@ struct xen_blkif {
int st_wr_req;
int st_oo_req;
int st_f_req;
int st_ds_req;
int st_rd_sect;
int st_wr_sect;
@@ -181,7 +217,7 @@ struct xen_blkif {
struct phys_req {
unsigned short dev;
unsigned short nr_sects;
blkif_sector_t nr_sects;
struct block_device *bdev;
blkif_sector_t sector_number;
};
@@ -195,6 +231,8 @@ int xen_blkif_schedule(void *arg);
int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
struct backend_info *be, int state);
int xen_blkbk_barrier(struct xenbus_transaction xbt,
struct backend_info *be, int state);
struct xenbus_device *xen_blkbk_xenbus(struct backend_info *be);
static inline void blkif_get_x86_32_req(struct blkif_request *dst,
@@ -205,12 +243,25 @@ static inline void blkif_get_x86_32_req(struct blkif_request *dst,
dst->nr_segments = src->nr_segments;
dst->handle = src->handle;
dst->id = src->id;
dst->u.rw.sector_number = src->sector_number;
barrier();
if (n > dst->nr_segments)
n = dst->nr_segments;
for (i = 0; i < n; i++)
dst->u.rw.seg[i] = src->seg[i];
switch (src->operation) {
case BLKIF_OP_READ:
case BLKIF_OP_WRITE:
case BLKIF_OP_WRITE_BARRIER:
case BLKIF_OP_FLUSH_DISKCACHE:
dst->u.rw.sector_number = src->u.rw.sector_number;
barrier();
if (n > dst->nr_segments)
n = dst->nr_segments;
for (i = 0; i < n; i++)
dst->u.rw.seg[i] = src->u.rw.seg[i];
break;
case BLKIF_OP_DISCARD:
dst->u.discard.sector_number = src->u.discard.sector_number;
dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
break;
default:
break;
}
}
static inline void blkif_get_x86_64_req(struct blkif_request *dst,
@@ -221,12 +272,25 @@ static inline void blkif_get_x86_64_req(struct blkif_request *dst,
dst->nr_segments = src->nr_segments;
dst->handle = src->handle;
dst->id = src->id;
dst->u.rw.sector_number = src->sector_number;
barrier();
if (n > dst->nr_segments)
n = dst->nr_segments;
for (i = 0; i < n; i++)
dst->u.rw.seg[i] = src->seg[i];
switch (src->operation) {
case BLKIF_OP_READ:
case BLKIF_OP_WRITE:
case BLKIF_OP_WRITE_BARRIER:
case BLKIF_OP_FLUSH_DISKCACHE:
dst->u.rw.sector_number = src->u.rw.sector_number;
barrier();
if (n > dst->nr_segments)
n = dst->nr_segments;
for (i = 0; i < n; i++)
dst->u.rw.seg[i] = src->u.rw.seg[i];
break;
case BLKIF_OP_DISCARD:
dst->u.discard.sector_number = src->u.discard.sector_number;
dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
break;
default:
break;
}
}
#endif /* __XEN_BLKIF__BACKEND__COMMON_H__ */
drivers/block/xen-blkback/xenbus.c
+76
View File
@@ -114,6 +114,8 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid)
spin_lock_init(&blkif->blk_ring_lock);
atomic_set(&blkif->refcnt, 1);
init_waitqueue_head(&blkif->wq);
init_completion(&blkif->drain_complete);
atomic_set(&blkif->drain, 0);
blkif->st_print = jiffies;
init_waitqueue_head(&blkif->waiting_to_free);
@@ -272,6 +274,7 @@ VBD_SHOW(oo_req, "%d\n", be->blkif->st_oo_req);
VBD_SHOW(rd_req, "%d\n", be->blkif->st_rd_req);
VBD_SHOW(wr_req, "%d\n", be->blkif->st_wr_req);
VBD_SHOW(f_req, "%d\n", be->blkif->st_f_req);
VBD_SHOW(ds_req, "%d\n", be->blkif->st_ds_req);
VBD_SHOW(rd_sect, "%d\n", be->blkif->st_rd_sect);
VBD_SHOW(wr_sect, "%d\n", be->blkif->st_wr_sect);
@@ -280,6 +283,7 @@ static struct attribute *xen_vbdstat_attrs[] = {
&dev_attr_rd_req.attr,
&dev_attr_wr_req.attr,
&dev_attr_f_req.attr,
&dev_attr_ds_req.attr,
&dev_attr_rd_sect.attr,
&dev_attr_wr_sect.attr,
NULL
@@ -419,6 +423,73 @@ int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
return err;
}
int xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info *be)
{
struct xenbus_device *dev = be->dev;
struct xen_blkif *blkif = be->blkif;
char *type;
int err;
int state = 0;
type = xenbus_read(XBT_NIL, dev->nodename, "type", NULL);
if (!IS_ERR(type)) {
if (strncmp(type, "file", 4) == 0) {
state = 1;
blkif->blk_backend_type = BLKIF_BACKEND_FILE;
}
if (strncmp(type, "phy", 3) == 0) {
struct block_device *bdev = be->blkif->vbd.bdev;
struct request_queue *q = bdev_get_queue(bdev);
if (blk_queue_discard(q)) {
err = xenbus_printf(xbt, dev->nodename,
"discard-granularity", "%u",
q->limits.discard_granularity);
if (err) {
xenbus_dev_fatal(dev, err,
"writing discard-granularity");
goto kfree;
}
err = xenbus_printf(xbt, dev->nodename,
"discard-alignment", "%u",
q->limits.discard_alignment);
if (err) {
xenbus_dev_fatal(dev, err,
"writing discard-alignment");
goto kfree;
}
state = 1;
blkif->blk_backend_type = BLKIF_BACKEND_PHY;
}
}
} else {
err = PTR_ERR(type);
xenbus_dev_fatal(dev, err, "reading type");
goto out;
}
err = xenbus_printf(xbt, dev->nodename, "feature-discard",
"%d", state);
if (err)
xenbus_dev_fatal(dev, err, "writing feature-discard");
kfree:
kfree(type);
out:
return err;
}
int xen_blkbk_barrier(struct xenbus_transaction xbt,
struct backend_info *be, int state)
{
struct xenbus_device *dev = be->dev;
int err;
err = xenbus_printf(xbt, dev->nodename, "feature-barrier",
"%d", state);
if (err)
xenbus_dev_fatal(dev, err, "writing feature-barrier");
return err;
}
/*
* Entry point to this code when a new device is created. Allocate the basic
* structures, and watch the store waiting for the hotplug scripts to tell us
@@ -650,6 +721,11 @@ again:
if (err)
goto abort;
err = xen_blkbk_discard(xbt, be);
/* If we can't advertise it is OK. */
err = xen_blkbk_barrier(xbt, be, be->blkif->vbd.flush_support);
err = xenbus_printf(xbt, dev->nodename, "sectors", "%llu",
(unsigned long long)vbd_sz(&be->blkif->vbd));
if (err) {
drivers/block/xen-blkfront.c
+97 -24
View File
@@ -98,6 +98,9 @@ struct blkfront_info
unsigned long shadow_free;
unsigned int feature_flush;
unsigned int flush_op;
unsigned int feature_discard;
unsigned int discard_granularity;
unsigned int discard_alignment;
int is_ready;
};
@@ -302,29 +305,36 @@ static int blkif_queue_request(struct request *req)
ring_req->operation = info->flush_op;
}
ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg);
BUG_ON(ring_req->nr_segments > BLKIF_MAX_SEGMENTS_PER_REQUEST);
if (unlikely(req->cmd_flags & REQ_DISCARD)) {
/* id, sector_number and handle are set above. */
ring_req->operation = BLKIF_OP_DISCARD;
ring_req->nr_segments = 0;
ring_req->u.discard.nr_sectors = blk_rq_sectors(req);
} else {
ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg);
BUG_ON(ring_req->nr_segments > BLKIF_MAX_SEGMENTS_PER_REQUEST);
for_each_sg(info->sg, sg, ring_req->nr_segments, i) {
buffer_mfn = pfn_to_mfn(page_to_pfn(sg_page(sg)));
fsect = sg->offset >> 9;
lsect = fsect + (sg->length >> 9) - 1;
/* install a grant reference. */
ref = gnttab_claim_grant_reference(&gref_head);
BUG_ON(ref == -ENOSPC);
for_each_sg(info->sg, sg, ring_req->nr_segments, i) {
buffer_mfn = pfn_to_mfn(page_to_pfn(sg_page(sg)));
fsect = sg->offset >> 9;
lsect = fsect + (sg->length >> 9) - 1;
/* install a grant reference. */
ref = gnttab_claim_grant_reference(&gref_head);
BUG_ON(ref == -ENOSPC);
gnttab_grant_foreign_access_ref(
ref,
info->xbdev->otherend_id,
buffer_mfn,
rq_data_dir(req) );
gnttab_grant_foreign_access_ref(
ref,
info->xbdev->otherend_id,
buffer_mfn,
rq_data_dir(req));
info->shadow[id].frame[i] = mfn_to_pfn(buffer_mfn);
ring_req->u.rw.seg[i] =
(struct blkif_request_segment) {
.gref = ref,
.first_sect = fsect,
.last_sect = lsect };
info->shadow[id].frame[i] = mfn_to_pfn(buffer_mfn);
ring_req->u.rw.seg[i] =
(struct blkif_request_segment) {
.gref = ref,
.first_sect = fsect,
.last_sect = lsect };
}
}
info->ring.req_prod_pvt++;
@@ -370,7 +380,9 @@ static void do_blkif_request(struct request_queue *rq)
blk_start_request(req);
if (req->cmd_type != REQ_TYPE_FS) {
if ((req->cmd_type != REQ_TYPE_FS) ||
((req->cmd_flags & (REQ_FLUSH | REQ_FUA)) &&
!info->flush_op)) {
__blk_end_request_all(req, -EIO);
continue;
}
@@ -399,6 +411,7 @@ wait:
static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
{
struct request_queue *rq;
struct blkfront_info *info = gd->private_data;
rq = blk_init_queue(do_blkif_request, &blkif_io_lock);
if (rq == NULL)
@@ -406,6 +419,13 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
queue_flag_set_unlocked(QUEUE_FLAG_VIRT, rq);
if (info->feature_discard) {
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, rq);
blk_queue_max_discard_sectors(rq, get_capacity(gd));
rq->limits.discard_granularity = info->discard_granularity;
rq->limits.discard_alignment = info->discard_alignment;
}
/* Hard sector size and max sectors impersonate the equiv. hardware. */
blk_queue_logical_block_size(rq, sector_size);
blk_queue_max_hw_sectors(rq, 512);
@@ -722,6 +742,17 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
error = (bret->status == BLKIF_RSP_OKAY) ? 0 : -EIO;
switch (bret->operation) {
case BLKIF_OP_DISCARD:
if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
struct request_queue *rq = info->rq;
printk(KERN_WARNING "blkfront: %s: discard op failed\n",
info->gd->disk_name);
error = -EOPNOTSUPP;
info->feature_discard = 0;
queue_flag_clear(QUEUE_FLAG_DISCARD, rq);
}
__blk_end_request_all(req, error);
break;
case BLKIF_OP_FLUSH_DISKCACHE:
case BLKIF_OP_WRITE_BARRIER:
if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
@@ -1098,6 +1129,33 @@ blkfront_closing(struct blkfront_info *info)
bdput(bdev);
}
static void blkfront_setup_discard(struct blkfront_info *info)
{
int err;
char *type;
unsigned int discard_granularity;
unsigned int discard_alignment;
type = xenbus_read(XBT_NIL, info->xbdev->otherend, "type", NULL);
if (IS_ERR(type))
return;
if (strncmp(type, "phy", 3) == 0) {
err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"discard-granularity", "%u", &discard_granularity,
"discard-alignment", "%u", &discard_alignment,
NULL);
if (!err) {
info->feature_discard = 1;
info->discard_granularity = discard_granularity;
info->discard_alignment = discard_alignment;
}
} else if (strncmp(type, "file", 4) == 0)
info->feature_discard = 1;
kfree(type);
}
/*
* Invoked when the backend is finally 'ready' (and has told produced
* the details about the physical device - #sectors, size, etc).
@@ -1108,7 +1166,7 @@ static void blkfront_connect(struct blkfront_info *info)
unsigned long sector_size;
unsigned int binfo;
int err;
int barrier, flush;
int barrier, flush, discard;
switch (info->connected) {
case BLKIF_STATE_CONNECTED:
@@ -1178,7 +1236,14 @@ static void blkfront_connect(struct blkfront_info *info)
info->feature_flush = REQ_FLUSH;
info->flush_op = BLKIF_OP_FLUSH_DISKCACHE;
}
err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"feature-discard", "%d", &discard,
NULL);
if (!err && discard)
blkfront_setup_discard(info);
err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size);
if (err) {
xenbus_dev_fatal(info->xbdev, err, "xlvbd_add at %s",
@@ -1385,6 +1450,8 @@ static struct xenbus_driver blkfront = {
static int __init xlblk_init(void)
{
int ret;
if (!xen_domain())
return -ENODEV;
@@ -1394,7 +1461,13 @@ static int __init xlblk_init(void)
return -ENODEV;
}
return xenbus_register_frontend(&blkfront);
ret = xenbus_register_frontend(&blkfront);
if (ret) {
unregister_blkdev(XENVBD_MAJOR, DEV_NAME);
return ret;
}
return 0;
}
module_init(xlblk_init);