static __be32
nfsd4_ff_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
struct nfsd4_layoutget *args)
{
struct nfsd4_layout_seg *seg = &args->lg_seg;
u32 device_generation = 0;
int error;
uid_t u;
struct pnfs_ff_layout *fl;
/*
* The super simple flex file server has 1 mirror, 1 data server,
* and 1 file handle. So instead of 4 allocs, do 1 for now.
* Zero it out for the stateid - don't want junk in there!
*/
error = -ENOMEM;
fl = kzalloc(sizeof(*fl), GFP_KERNEL);
if (!fl)
goto out_error;
args->lg_content = fl;
/*
* Avoid layout commit, try to force the I/O to the DS,
* and for fun, cause all IOMODE_RW layout segments to
* effectively be WRITE only.
*/
fl->flags = FF_FLAGS_NO_LAYOUTCOMMIT | FF_FLAGS_NO_IO_THRU_MDS |
FF_FLAGS_NO_READ_IO;
/* Do not allow a IOMODE_READ segment to have write pemissions */
if (seg->iomode == IOMODE_READ) {
u = from_kuid(&init_user_ns, inode->i_uid) + 1;
fl->uid = make_kuid(&init_user_ns, u);
} else
fl->uid = inode->i_uid;
fl->gid = inode->i_gid;
error = nfsd4_set_deviceid(&fl->deviceid, fhp, device_generation);
if (error)
goto out_error;
fl->fh.size = fhp->fh_handle.fh_size;
memcpy(fl->fh.data, &fhp->fh_handle.fh_base, fl->fh.size);
/* Give whole file layout segments */
seg->offset = 0;
seg->length = NFS4_MAX_UINT64;
dprintk("GET: 0x%llx:0x%llx %d\n", seg->offset, seg->length,
seg->iomode);
return 0;
out_error:
seg->length = 0;
return nfserrno(error);
}
static __be32
nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
struct nfsd4_layoutget *args)
{
struct nfsd4_layout_seg *seg = &args->lg_seg;
struct super_block *sb = inode->i_sb;
u32 block_size = (1 << inode->i_blkbits);
struct pnfs_block_extent *bex;
struct iomap iomap;
u32 device_generation = 0;
int error;
/*
* We do not attempt to support I/O smaller than the fs block size,
* or not aligned to it.
*/
if (args->lg_minlength < block_size) {
dprintk("pnfsd: I/O too small\n");
goto out_layoutunavailable;
}
if (seg->offset & (block_size - 1)) {
dprintk("pnfsd: I/O misaligned\n");
goto out_layoutunavailable;
}
/*
* Some clients barf on non-zero block numbers for NONE or INVALID
* layouts, so make sure to zero the whole structure.
*/
error = -ENOMEM;
bex = kzalloc(sizeof(*bex), GFP_KERNEL);
if (!bex)
goto out_error;
args->lg_content = bex;
error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
&iomap, seg->iomode != IOMODE_READ,
&device_generation);
if (error) {
if (error == -ENXIO)
goto out_layoutunavailable;
goto out_error;
}
if (iomap.length < args->lg_minlength) {
dprintk("pnfsd: extent smaller than minlength\n");
goto out_layoutunavailable;
}
switch (iomap.type) {
case IOMAP_MAPPED:
if (seg->iomode == IOMODE_READ)
bex->es = PNFS_BLOCK_READ_DATA;
else
bex->es = PNFS_BLOCK_READWRITE_DATA;
bex->soff = (iomap.blkno << 9);
break;
case IOMAP_UNWRITTEN:
if (seg->iomode & IOMODE_RW) {
/*
* Crack monkey special case from section 2.3.1.
*/
if (args->lg_minlength == 0) {
dprintk("pnfsd: no soup for you!\n");
goto out_layoutunavailable;
}
bex->es = PNFS_BLOCK_INVALID_DATA;
bex->soff = (iomap.blkno << 9);
break;
}
/*FALLTHRU*/
case IOMAP_HOLE:
if (seg->iomode == IOMODE_READ) {
bex->es = PNFS_BLOCK_NONE_DATA;
break;
}
/*FALLTHRU*/
case IOMAP_DELALLOC:
default:
WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
goto out_layoutunavailable;
}
error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
if (error)
goto out_error;
bex->foff = iomap.offset;
bex->len = iomap.length;
seg->offset = iomap.offset;
seg->length = iomap.length;
dprintk("GET: %lld:%lld %d\n", bex->foff, bex->len, bex->es);
return 0;
out_error:
seg->length = 0;
return nfserrno(error);
out_layoutunavailable:
seg->length = 0;
return nfserr_layoutunavailable;
}
