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    Subject[PATCH 24/26] ceph: ioctls
    Date
    A few Ceph ioctls for getting and setting file layout (striping)
    parameters, and learning the identity and network address of the OSD a
    given region of a file is stored on.

    Signed-off-by: Sage Weil <sage@newdream.net>
    ---
    Documentation/ioctl/ioctl-number.txt | 1 +
    fs/ceph/ioctl.c | 160 ++++++++++++++++++++++++++++++++++
    fs/ceph/ioctl.h | 40 +++++++++
    3 files changed, 201 insertions(+), 0 deletions(-)
    create mode 100644 fs/ceph/ioctl.c
    create mode 100644 fs/ceph/ioctl.h

    diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
    index 35cf64d..e07e5b5 100644
    --- a/Documentation/ioctl/ioctl-number.txt
    +++ b/Documentation/ioctl/ioctl-number.txt
    @@ -292,6 +292,7 @@ Code Seq#(hex) Include File Comments
    0x92 00-0F drivers/usb/mon/mon_bin.c
    0x93 60-7F linux/auto_fs.h
    0x94 all fs/btrfs/ioctl.h
    +0x97 00-7F fs/ceph/ioctl.h Ceph file system
    0x99 00-0F 537-Addinboard driver
    <mailto:buk@buks.ipn.de>
    0xA0 all linux/sdp/sdp.h Industrial Device Project
    diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
    new file mode 100644
    index 0000000..8a5bcae
    --- /dev/null
    +++ b/fs/ceph/ioctl.c
    @@ -0,0 +1,160 @@
    +#include <linux/in.h>
    +
    +#include "ioctl.h"
    +#include "super.h"
    +#include "ceph_debug.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->f_dentry->d_inode);
    + struct ceph_ioctl_layout l;
    + int err;
    +
    + err = ceph_do_getattr(file->f_dentry->d_inode, 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)le32_to_cpu(ci->i_layout.fl_pg_preferred);
    + if (copy_to_user(arg, &l, sizeof(l)))
    + return -EFAULT;
    + }
    +
    + return err;
    +}
    +
    +static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
    +{
    + struct inode *inode = file->f_dentry->d_inode;
    + struct inode *parent_inode = file->f_dentry->d_parent->d_inode;
    + struct ceph_mds_client *mdsc = &ceph_sb_to_client(inode->i_sb)->mdsc;
    + struct ceph_mds_request *req;
    + struct ceph_ioctl_layout l;
    + int err, i;
    +
    + /* copy and validate */
    + if (copy_from_user(&l, arg, sizeof(l)))
    + return -EFAULT;
    +
    + if ((l.object_size & ~PAGE_MASK) ||
    + (l.stripe_unit & ~PAGE_MASK) ||
    + !l.stripe_unit ||
    + (l.object_size &&
    + (unsigned)l.object_size % (unsigned)l.stripe_unit))
    + return -EINVAL;
    +
    + /* make sure it's a valid data pool */
    + if (l.data_pool > 0) {
    + 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;
    + }
    +
    + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETLAYOUT,
    + USE_AUTH_MDS);
    + if (IS_ERR(req))
    + return PTR_ERR(req);
    + req->r_inode = igrab(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);
    + req->r_args.setlayout.layout.fl_pg_preferred =
    + cpu_to_le32(l.preferred_osd);
    +
    + err = ceph_mdsc_do_request(mdsc, parent_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->f_dentry->d_inode;
    + struct ceph_inode_info *ci = ceph_inode(inode);
    + struct ceph_osd_client *osdc = &ceph_client(inode->i_sb)->osdc;
    + u64 len = 1, olen;
    + u64 tmp;
    + struct ceph_object_layout ol;
    + struct ceph_pg pgid;
    +
    + /* copy and validate */
    + if (copy_from_user(&dl, arg, sizeof(dl)))
    + return -EFAULT;
    +
    + down_read(&osdc->map_sem);
    + ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
    + &dl.object_no, &dl.object_offset, &olen);
    + 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_object_layout(&ol, dl.object_name, &ci->i_layout,
    + osdc->osdmap);
    +
    + pgid = ol.ol_pgid;
    + 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;
    +}
    +
    +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_GET_DATALOC:
    + return ceph_ioctl_get_dataloc(file, (void __user *)arg);
    + }
    + return -ENOTTY;
    +}
    diff --git a/fs/ceph/ioctl.h b/fs/ceph/ioctl.h
    new file mode 100644
    index 0000000..25e4f1a
    --- /dev/null
    +++ b/fs/ceph/ioctl.h
    @@ -0,0 +1,40 @@
    +#ifndef FS_CEPH_IOCTL_H
    +#define FS_CEPH_IOCTL_H
    +
    +#include <linux/ioctl.h>
    +#include <linux/types.h>
    +
    +#define CEPH_IOCTL_MAGIC 0x97
    +
    +/* just use u64 to align sanely on all archs */
    +struct ceph_ioctl_layout {
    + __u64 stripe_unit, stripe_count, object_size;
    + __u64 data_pool;
    + __s64 preferred_osd;
    +};
    +
    +#define CEPH_IOC_GET_LAYOUT _IOR(CEPH_IOCTL_MAGIC, 1, \
    + struct ceph_ioctl_layout)
    +#define CEPH_IOC_SET_LAYOUT _IOW(CEPH_IOCTL_MAGIC, 2, \
    + struct ceph_ioctl_layout)
    +
    +/*
    + * Extract identity, address of the OSD and object storing a given
    + * file offset.
    + */
    +struct ceph_ioctl_dataloc {
    + __u64 file_offset; /* in+out: file offset */
    + __u64 object_offset; /* out: offset in object */
    + __u64 object_no; /* out: object # */
    + __u64 object_size; /* out: object size */
    + char object_name[64]; /* out: object name */
    + __u64 block_offset; /* out: offset in block */
    + __u64 block_size; /* out: block length */
    + __s64 osd; /* out: osd # */
    + struct sockaddr_storage osd_addr; /* out: osd address */
    +};
    +
    +#define CEPH_IOC_GET_DATALOC _IOWR(CEPH_IOCTL_MAGIC, 3, \
    + struct ceph_ioctl_dataloc)
    +
    +#endif
    --
    1.7.0


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