https://github.com/torvalds/linux
Tip revision: b36f4be3de1b123d8601de062e7dbfc904f305fb authored by Linus Torvalds on 18 August 2013, 21:36:53 UTC
Linux 3.11-rc6
Linux 3.11-rc6
Tip revision: b36f4be
ioctl.c
#include <linux/in.h>
#include "super.h"
#include "mds_client.h"
#include <linux/ceph/ceph_debug.h>
#include "ioctl.h"
/*
* ioctls
*/
/*
* get and set the file layout
*/
static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
{
struct ceph_inode_info *ci = ceph_inode(file_inode(file));
struct ceph_ioctl_layout l;
int err;
err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT);
if (!err) {
l.stripe_unit = ceph_file_layout_su(ci->i_layout);
l.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
l.object_size = ceph_file_layout_object_size(ci->i_layout);
l.data_pool = le32_to_cpu(ci->i_layout.fl_pg_pool);
l.preferred_osd = (s32)-1;
if (copy_to_user(arg, &l, sizeof(l)))
return -EFAULT;
}
return err;
}
static long __validate_layout(struct ceph_mds_client *mdsc,
struct ceph_ioctl_layout *l)
{
int i, err;
/* validate striping parameters */
if ((l->object_size & ~PAGE_MASK) ||
(l->stripe_unit & ~PAGE_MASK) ||
(l->stripe_unit != 0 &&
((unsigned)l->object_size % (unsigned)l->stripe_unit)))
return -EINVAL;
/* make sure it's a valid data pool */
mutex_lock(&mdsc->mutex);
err = -EINVAL;
for (i = 0; i < mdsc->mdsmap->m_num_data_pg_pools; i++)
if (mdsc->mdsmap->m_data_pg_pools[i] == l->data_pool) {
err = 0;
break;
}
mutex_unlock(&mdsc->mutex);
if (err)
return err;
return 0;
}
static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
{
struct inode *inode = file_inode(file);
struct inode *parent_inode;
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
struct ceph_mds_request *req;
struct ceph_ioctl_layout l;
struct ceph_inode_info *ci = ceph_inode(file_inode(file));
struct ceph_ioctl_layout nl;
int err;
if (copy_from_user(&l, arg, sizeof(l)))
return -EFAULT;
/* validate changed params against current layout */
err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT);
if (err)
return err;
memset(&nl, 0, sizeof(nl));
if (l.stripe_count)
nl.stripe_count = l.stripe_count;
else
nl.stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
if (l.stripe_unit)
nl.stripe_unit = l.stripe_unit;
else
nl.stripe_unit = ceph_file_layout_su(ci->i_layout);
if (l.object_size)
nl.object_size = l.object_size;
else
nl.object_size = ceph_file_layout_object_size(ci->i_layout);
if (l.data_pool)
nl.data_pool = l.data_pool;
else
nl.data_pool = ceph_file_layout_pg_pool(ci->i_layout);
/* this is obsolete, and always -1 */
nl.preferred_osd = le64_to_cpu(-1);
err = __validate_layout(mdsc, &nl);
if (err)
return err;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
USE_AUTH_MDS);
if (IS_ERR(req))
return PTR_ERR(req);
req->r_inode = inode;
ihold(inode);
req->r_inode_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL;
req->r_args.setlayout.layout.fl_stripe_unit =
cpu_to_le32(l.stripe_unit);
req->r_args.setlayout.layout.fl_stripe_count =
cpu_to_le32(l.stripe_count);
req->r_args.setlayout.layout.fl_object_size =
cpu_to_le32(l.object_size);
req->r_args.setlayout.layout.fl_pg_pool = cpu_to_le32(l.data_pool);
parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
err = ceph_mdsc_do_request(mdsc, parent_inode, req);
iput(parent_inode);
ceph_mdsc_put_request(req);
return err;
}
/*
* Set a layout policy on a directory inode. All items in the tree
* rooted at this inode will inherit this layout on creation,
* (It doesn't apply retroactively )
* unless a subdirectory has its own layout policy.
*/
static long ceph_ioctl_set_layout_policy (struct file *file, void __user *arg)
{
struct inode *inode = file_inode(file);
struct ceph_mds_request *req;
struct ceph_ioctl_layout l;
int err;
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
/* copy and validate */
if (copy_from_user(&l, arg, sizeof(l)))
return -EFAULT;
err = __validate_layout(mdsc, &l);
if (err)
return err;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETDIRLAYOUT,
USE_AUTH_MDS);
if (IS_ERR(req))
return PTR_ERR(req);
req->r_inode = inode;
ihold(inode);
req->r_args.setlayout.layout.fl_stripe_unit =
cpu_to_le32(l.stripe_unit);
req->r_args.setlayout.layout.fl_stripe_count =
cpu_to_le32(l.stripe_count);
req->r_args.setlayout.layout.fl_object_size =
cpu_to_le32(l.object_size);
req->r_args.setlayout.layout.fl_pg_pool =
cpu_to_le32(l.data_pool);
err = ceph_mdsc_do_request(mdsc, inode, req);
ceph_mdsc_put_request(req);
return err;
}
/*
* Return object name, size/offset information, and location (OSD
* number, network address) for a given file offset.
*/
static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
{
struct ceph_ioctl_dataloc dl;
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_osd_client *osdc =
&ceph_sb_to_client(inode->i_sb)->client->osdc;
u64 len = 1, olen;
u64 tmp;
struct ceph_pg pgid;
int r;
/* copy and validate */
if (copy_from_user(&dl, arg, sizeof(dl)))
return -EFAULT;
down_read(&osdc->map_sem);
r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len,
&dl.object_no, &dl.object_offset,
&olen);
if (r < 0)
return -EIO;
dl.file_offset -= dl.object_offset;
dl.object_size = ceph_file_layout_object_size(ci->i_layout);
dl.block_size = ceph_file_layout_su(ci->i_layout);
/* block_offset = object_offset % block_size */
tmp = dl.object_offset;
dl.block_offset = do_div(tmp, dl.block_size);
snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
ceph_ino(inode), dl.object_no);
ceph_calc_ceph_pg(&pgid, dl.object_name, osdc->osdmap,
ceph_file_layout_pg_pool(ci->i_layout));
dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
if (dl.osd >= 0) {
struct ceph_entity_addr *a =
ceph_osd_addr(osdc->osdmap, dl.osd);
if (a)
memcpy(&dl.osd_addr, &a->in_addr, sizeof(dl.osd_addr));
} else {
memset(&dl.osd_addr, 0, sizeof(dl.osd_addr));
}
up_read(&osdc->map_sem);
/* send result back to user */
if (copy_to_user(arg, &dl, sizeof(dl)))
return -EFAULT;
return 0;
}
static long ceph_ioctl_lazyio(struct file *file)
{
struct ceph_file_info *fi = file->private_data;
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
spin_lock(&ci->i_ceph_lock);
ci->i_nr_by_mode[fi->fmode]--;
fi->fmode |= CEPH_FILE_MODE_LAZY;
ci->i_nr_by_mode[fi->fmode]++;
spin_unlock(&ci->i_ceph_lock);
dout("ioctl_layzio: file %p marked lazy\n", file);
ceph_check_caps(ci, 0, NULL);
} else {
dout("ioctl_layzio: file %p already lazy\n", file);
}
return 0;
}
static long ceph_ioctl_syncio(struct file *file)
{
struct ceph_file_info *fi = file->private_data;
fi->flags |= CEPH_F_SYNC;
return 0;
}
long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
switch (cmd) {
case CEPH_IOC_GET_LAYOUT:
return ceph_ioctl_get_layout(file, (void __user *)arg);
case CEPH_IOC_SET_LAYOUT:
return ceph_ioctl_set_layout(file, (void __user *)arg);
case CEPH_IOC_SET_LAYOUT_POLICY:
return ceph_ioctl_set_layout_policy(file, (void __user *)arg);
case CEPH_IOC_GET_DATALOC:
return ceph_ioctl_get_dataloc(file, (void __user *)arg);
case CEPH_IOC_LAZYIO:
return ceph_ioctl_lazyio(file);
case CEPH_IOC_SYNCIO:
return ceph_ioctl_syncio(file);
}
return -ENOTTY;
}