mirrors/scst
1
0
Fork 0
mirror of https://github.com/SCST-project/scst.git synced 2026-08-20 06:06:23 +00:00
Code Issues Packages Projects Releases Wiki Activity

Auto set thin provisioning for BLOCKIO devices

Browse Source 
git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@3587 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2011-06-17 22:35:12 +00:00
parent 28fd3bef3c
commit 5a18989468
1 changed files with 29 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files
scst/src/dev_handlers/scst_vdisk.c
+29 -18
View File
@@ -154,6 +154,9 @@ struct scst_vdisk_dev {
unsigned int cdrom_empty:1;
unsigned int removable:1;
unsigned int thin_provisioned:1;
unsigned int thin_provisioned_manually_set:1;
unsigned int dev_thin_provisioned:1;
int virt_id;
char name[16+1]; /* Name of the virtual device,
@@ -608,18 +611,19 @@ static void vdisk_check_tp_support(struct scst_vdisk_dev *virt_dev)
{
struct inode *inode;
struct file *fd;
bool supported = false;
TRACE_ENTRY();
if (virt_dev->rd_only || !virt_dev->thin_provisioned)
goto out;
virt_dev->dev_thin_provisioned = 0;
if (virt_dev->rd_only)
goto out_check;
fd = filp_open(virt_dev->filename, O_LARGEFILE, 0600);
if (IS_ERR(fd)) {
PRINT_ERROR("filp_open(%s) returned error %ld",
virt_dev->filename, PTR_ERR(fd));
goto out;
goto out_check;
}
inode = fd->f_dentry->d_inode;
@@ -631,31 +635,37 @@ static void vdisk_check_tp_support(struct scst_vdisk_dev *virt_dev)
goto out_close;
}
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 31)
supported = blk_queue_discard(bdev_get_queue(inode->i_bdev));
#else
supported = false;
virt_dev->dev_thin_provisioned =
blk_queue_discard(bdev_get_queue(inode->i_bdev));
#endif
} else {
/*
* truncate_range() was chosen rather as a sample. In future,
* when unmap of range of blocks in file become standard, we
* will just switch to the new call.
*/
supported = (inode->i_op->truncate_range != NULL);
}
if (!supported) {
PRINT_WARNING("Device %s doesn't support thin "
"provisioning, disabling it.",
virt_dev->filename);
virt_dev->thin_provisioned = 0;
virt_dev->dev_thin_provisioned = (inode->i_op->truncate_range != NULL);
}
out_close:
filp_close(fd, NULL);
out:
out_check:
if (virt_dev->thin_provisioned_manually_set) {
if (virt_dev->thin_provisioned && !virt_dev->dev_thin_provisioned) {
PRINT_WARNING("Device %s doesn't support thin "
"provisioning, disabling it.",
virt_dev->filename);
virt_dev->thin_provisioned = 0;
}
} else if (virt_dev->blockio) {
virt_dev->thin_provisioned = virt_dev->dev_thin_provisioned;
if (virt_dev->thin_provisioned)
PRINT_INFO("Auto enable thin provisioning for device "
"%s", virt_dev->filename);
}
TRACE_EXIT();
return;
}
@@ -3582,6 +3592,7 @@ static int vdev_parse_add_dev_params(struct scst_vdisk_dev *virt_dev,
TRACE_DBG("REMOVABLE %d", virt_dev->removable);
} else if (!strcasecmp("thin_provisioned", p)) {
virt_dev->thin_provisioned = val;
virt_dev->thin_provisioned_manually_set = 1;
TRACE_DBG("THIN PROVISIONED %d",
virt_dev->thin_provisioned);
} else if (!strcasecmp("blocksize", p)) {
@@ -4260,7 +4271,7 @@ static ssize_t vdisk_sysfs_tp_show(struct kobject *kobj,
virt_dev = dev->dh_priv;
pos = sprintf(buf, "%d\n%s", virt_dev->thin_provisioned ? 1 : 0,
(virt_dev->thin_provisioned == DEF_THIN_PROVISIONED) ? "" :
(virt_dev->thin_provisioned == virt_dev->dev_thin_provisioned) ? "" :
SCST_SYSFS_KEY_MARK "");
TRACE_EXIT_RES(pos);