#include "internal.h"
#include "iostat.h"
#include "callback.h"
+#include "pnfs.h"
#define NFSDBG_FACILITY NFSDBG_PROC
dprintk("<-- %s status=%d\n", __func__, status);
return status;
}
+
+static void
+nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
+{
+ struct nfs4_layoutget *lgp = calldata;
+ struct inode *ino = lgp->args.inode;
+ struct nfs_server *server = NFS_SERVER(ino);
+
+ dprintk("--> %s\n", __func__);
+ if (nfs4_setup_sequence(server, &lgp->args.seq_args,
+ &lgp->res.seq_res, 0, task))
+ return;
+ rpc_call_start(task);
+}
+
+static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
+{
+ struct nfs4_layoutget *lgp = calldata;
+ struct nfs_server *server = NFS_SERVER(lgp->args.inode);
+
+ dprintk("--> %s\n", __func__);
+
+ if (!nfs4_sequence_done(task, &lgp->res.seq_res))
+ return;
+
+ switch (task->tk_status) {
+ case 0:
+ break;
+ case -NFS4ERR_LAYOUTTRYLATER:
+ case -NFS4ERR_RECALLCONFLICT:
+ task->tk_status = -NFS4ERR_DELAY;
+ /* Fall through */
+ default:
+ if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
+ rpc_restart_call_prepare(task);
+ return;
+ }
+ }
+ lgp->status = task->tk_status;
+ dprintk("<-- %s\n", __func__);
+}
+
+static void nfs4_layoutget_release(void *calldata)
+{
+ struct nfs4_layoutget *lgp = calldata;
+
+ dprintk("--> %s\n", __func__);
+ put_layout_hdr(lgp->args.inode);
+ if (lgp->res.layout.buf != NULL)
+ free_page((unsigned long) lgp->res.layout.buf);
+ put_nfs_open_context(lgp->args.ctx);
+ kfree(calldata);
+ dprintk("<-- %s\n", __func__);
+}
+
+static const struct rpc_call_ops nfs4_layoutget_call_ops = {
+ .rpc_call_prepare = nfs4_layoutget_prepare,
+ .rpc_call_done = nfs4_layoutget_done,
+ .rpc_release = nfs4_layoutget_release,
+};
+
+int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
+{
+ struct nfs_server *server = NFS_SERVER(lgp->args.inode);
+ struct rpc_task *task;
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
+ .rpc_argp = &lgp->args,
+ .rpc_resp = &lgp->res,
+ };
+ struct rpc_task_setup task_setup_data = {
+ .rpc_client = server->client,
+ .rpc_message = &msg,
+ .callback_ops = &nfs4_layoutget_call_ops,
+ .callback_data = lgp,
+ .flags = RPC_TASK_ASYNC,
+ };
+ int status = 0;
+
+ dprintk("--> %s\n", __func__);
+
+ lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
+ if (lgp->res.layout.buf == NULL) {
+ nfs4_layoutget_release(lgp);
+ return -ENOMEM;
+ }
+
+ lgp->res.seq_res.sr_slot = NULL;
+ task = rpc_run_task(&task_setup_data);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ status = nfs4_wait_for_completion_rpc_task(task);
+ if (status != 0)
+ goto out;
+ status = lgp->status;
+ if (status != 0)
+ goto out;
+ status = pnfs_layout_process(lgp);
+out:
+ rpc_put_task(task);
+ dprintk("<-- %s status=%d\n", __func__, status);
+ return status;
+}
+
+static int
+_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
+{
+ struct nfs4_getdeviceinfo_args args = {
+ .pdev = pdev,
+ };
+ struct nfs4_getdeviceinfo_res res = {
+ .pdev = pdev,
+ };
+ struct rpc_message msg = {
+ .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
+ .rpc_argp = &args,
+ .rpc_resp = &res,
+ };
+ int status;
+
+ dprintk("--> %s\n", __func__);
+ status = nfs4_call_sync(server, &msg, &args, &res, 0);
+ dprintk("<-- %s status=%d\n", __func__, status);
+
+ return status;
+}
+
+int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
+{
+ struct nfs4_exception exception = { };
+ int err;
+
+ do {
+ err = nfs4_handle_exception(server,
+ _nfs4_proc_getdeviceinfo(server, pdev),
+ &exception);
+ } while (exception.retry);
+ return err;
+}
+EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
+
#endif /* CONFIG_NFS_V4_1 */
struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
#include <linux/nfs_idmap.h>
#include "nfs4_fs.h"
#include "internal.h"
+#include "pnfs.h"
#define NFSDBG_FACILITY NFSDBG_XDR
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
#define encode_reclaim_complete_maxsz (op_encode_hdr_maxsz + 4)
#define decode_reclaim_complete_maxsz (op_decode_hdr_maxsz + 4)
+#define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + 4 + \
+ XDR_QUADLEN(NFS4_DEVICEID4_SIZE))
+#define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
+ 1 /* layout type */ + \
+ 1 /* opaque devaddr4 length */ + \
+ /* devaddr4 payload is read into page */ \
+ 1 /* notification bitmap length */ + \
+ 1 /* notification bitmap */)
+#define encode_layoutget_maxsz (op_encode_hdr_maxsz + 10 + \
+ encode_stateid_maxsz)
+#define decode_layoutget_maxsz (op_decode_hdr_maxsz + 8 + \
+ decode_stateid_maxsz + \
+ XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
#else /* CONFIG_NFS_V4_1 */
#define encode_sequence_maxsz 0
#define decode_sequence_maxsz 0
#define NFS4_dec_reclaim_complete_sz (compound_decode_hdr_maxsz + \
decode_sequence_maxsz + \
decode_reclaim_complete_maxsz)
+#define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz + \
+ encode_sequence_maxsz +\
+ encode_getdeviceinfo_maxsz)
+#define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz + \
+ decode_sequence_maxsz + \
+ decode_getdeviceinfo_maxsz)
+#define NFS4_enc_layoutget_sz (compound_encode_hdr_maxsz + \
+ encode_sequence_maxsz + \
+ encode_putfh_maxsz + \
+ encode_layoutget_maxsz)
+#define NFS4_dec_layoutget_sz (compound_decode_hdr_maxsz + \
+ decode_sequence_maxsz + \
+ decode_putfh_maxsz + \
+ decode_layoutget_maxsz)
const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
compound_encode_hdr_maxsz +
#endif /* CONFIG_NFS_V4_1 */
}
+#ifdef CONFIG_NFS_V4_1
+static void
+encode_getdeviceinfo(struct xdr_stream *xdr,
+ const struct nfs4_getdeviceinfo_args *args,
+ struct compound_hdr *hdr)
+{
+ __be32 *p;
+
+ p = reserve_space(xdr, 16 + NFS4_DEVICEID4_SIZE);
+ *p++ = cpu_to_be32(OP_GETDEVICEINFO);
+ p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
+ NFS4_DEVICEID4_SIZE);
+ *p++ = cpu_to_be32(args->pdev->layout_type);
+ *p++ = cpu_to_be32(args->pdev->pglen); /* gdia_maxcount */
+ *p++ = cpu_to_be32(0); /* bitmap length 0 */
+ hdr->nops++;
+ hdr->replen += decode_getdeviceinfo_maxsz;
+}
+
+static void
+encode_layoutget(struct xdr_stream *xdr,
+ const struct nfs4_layoutget_args *args,
+ struct compound_hdr *hdr)
+{
+ nfs4_stateid stateid;
+ __be32 *p;
+
+ p = reserve_space(xdr, 44 + NFS4_STATEID_SIZE);
+ *p++ = cpu_to_be32(OP_LAYOUTGET);
+ *p++ = cpu_to_be32(0); /* Signal layout available */
+ *p++ = cpu_to_be32(args->type);
+ *p++ = cpu_to_be32(args->range.iomode);
+ p = xdr_encode_hyper(p, args->range.offset);
+ p = xdr_encode_hyper(p, args->range.length);
+ p = xdr_encode_hyper(p, args->minlength);
+ pnfs_get_layout_stateid(&stateid, NFS_I(args->inode)->layout,
+ args->ctx->state);
+ p = xdr_encode_opaque_fixed(p, &stateid.data, NFS4_STATEID_SIZE);
+ *p = cpu_to_be32(args->maxcount);
+
+ dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
+ __func__,
+ args->type,
+ args->range.iomode,
+ (unsigned long)args->range.offset,
+ (unsigned long)args->range.length,
+ args->maxcount);
+ hdr->nops++;
+ hdr->replen += decode_layoutget_maxsz;
+}
+#endif /* CONFIG_NFS_V4_1 */
+
/*
* END OF "GENERIC" ENCODE ROUTINES.
*/
return 0;
}
+/*
+ * Encode GETDEVICEINFO request
+ */
+static int nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req, uint32_t *p,
+ struct nfs4_getdeviceinfo_args *args)
+{
+ struct xdr_stream xdr;
+ struct compound_hdr hdr = {
+ .minorversion = nfs4_xdr_minorversion(&args->seq_args),
+ };
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_compound_hdr(&xdr, req, &hdr);
+ encode_sequence(&xdr, &args->seq_args, &hdr);
+ encode_getdeviceinfo(&xdr, args, &hdr);
+
+ /* set up reply kvec. Subtract notification bitmap max size (2)
+ * so that notification bitmap is put in xdr_buf tail */
+ xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
+ args->pdev->pages, args->pdev->pgbase,
+ args->pdev->pglen);
+
+ encode_nops(&hdr);
+ return 0;
+}
+
+/*
+ * Encode LAYOUTGET request
+ */
+static int nfs4_xdr_enc_layoutget(struct rpc_rqst *req, uint32_t *p,
+ struct nfs4_layoutget_args *args)
+{
+ struct xdr_stream xdr;
+ struct compound_hdr hdr = {
+ .minorversion = nfs4_xdr_minorversion(&args->seq_args),
+ };
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_compound_hdr(&xdr, req, &hdr);
+ encode_sequence(&xdr, &args->seq_args, &hdr);
+ encode_putfh(&xdr, NFS_FH(args->inode), &hdr);
+ encode_layoutget(&xdr, args, &hdr);
+ encode_nops(&hdr);
+ return 0;
+}
#endif /* CONFIG_NFS_V4_1 */
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
#endif /* CONFIG_NFS_V4_1 */
}
+#if defined(CONFIG_NFS_V4_1)
+
+static int decode_getdeviceinfo(struct xdr_stream *xdr,
+ struct pnfs_device *pdev)
+{
+ __be32 *p;
+ uint32_t len, type;
+ int status;
+
+ status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
+ if (status) {
+ if (status == -ETOOSMALL) {
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ goto out_overflow;
+ pdev->mincount = be32_to_cpup(p);
+ dprintk("%s: Min count too small. mincnt = %u\n",
+ __func__, pdev->mincount);
+ }
+ return status;
+ }
+
+ p = xdr_inline_decode(xdr, 8);
+ if (unlikely(!p))
+ goto out_overflow;
+ type = be32_to_cpup(p++);
+ if (type != pdev->layout_type) {
+ dprintk("%s: layout mismatch req: %u pdev: %u\n",
+ __func__, pdev->layout_type, type);
+ return -EINVAL;
+ }
+ /*
+ * Get the length of the opaque device_addr4. xdr_read_pages places
+ * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
+ * and places the remaining xdr data in xdr_buf->tail
+ */
+ pdev->mincount = be32_to_cpup(p);
+ xdr_read_pages(xdr, pdev->mincount); /* include space for the length */
+
+ /* Parse notification bitmap, verifying that it is zero. */
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ goto out_overflow;
+ len = be32_to_cpup(p);
+ if (len) {
+ int i;
+
+ p = xdr_inline_decode(xdr, 4 * len);
+ if (unlikely(!p))
+ goto out_overflow;
+ for (i = 0; i < len; i++, p++) {
+ if (be32_to_cpup(p)) {
+ dprintk("%s: notifications not supported\n",
+ __func__);
+ return -EIO;
+ }
+ }
+ }
+ return 0;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+
+static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
+ struct nfs4_layoutget_res *res)
+{
+ __be32 *p;
+ int status;
+ u32 layout_count;
+
+ status = decode_op_hdr(xdr, OP_LAYOUTGET);
+ if (status)
+ return status;
+ p = xdr_inline_decode(xdr, 8 + NFS4_STATEID_SIZE);
+ if (unlikely(!p))
+ goto out_overflow;
+ res->return_on_close = be32_to_cpup(p++);
+ p = xdr_decode_opaque_fixed(p, res->stateid.data, NFS4_STATEID_SIZE);
+ layout_count = be32_to_cpup(p);
+ if (!layout_count) {
+ dprintk("%s: server responded with empty layout array\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ p = xdr_inline_decode(xdr, 24);
+ if (unlikely(!p))
+ goto out_overflow;
+ p = xdr_decode_hyper(p, &res->range.offset);
+ p = xdr_decode_hyper(p, &res->range.length);
+ res->range.iomode = be32_to_cpup(p++);
+ res->type = be32_to_cpup(p++);
+
+ status = decode_opaque_inline(xdr, &res->layout.len, (char **)&p);
+ if (unlikely(status))
+ return status;
+
+ dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
+ __func__,
+ (unsigned long)res->range.offset,
+ (unsigned long)res->range.length,
+ res->range.iomode,
+ res->type,
+ res->layout.len);
+
+ /* nfs4_proc_layoutget allocated a single page */
+ if (res->layout.len > PAGE_SIZE)
+ return -ENOMEM;
+ memcpy(res->layout.buf, p, res->layout.len);
+
+ if (layout_count > 1) {
+ /* We only handle a length one array at the moment. Any
+ * further entries are just ignored. Note that this means
+ * the client may see a response that is less than the
+ * minimum it requested.
+ */
+ dprintk("%s: server responded with %d layouts, dropping tail\n",
+ __func__, layout_count);
+ }
+
+ return 0;
+out_overflow:
+ print_overflow_msg(__func__, xdr);
+ return -EIO;
+}
+#endif /* CONFIG_NFS_V4_1 */
+
/*
* END OF "GENERIC" DECODE ROUTINES.
*/
status = decode_reclaim_complete(&xdr, (void *)NULL);
return status;
}
+
+/*
+ * Decode GETDEVINFO response
+ */
+static int nfs4_xdr_dec_getdeviceinfo(struct rpc_rqst *rqstp, uint32_t *p,
+ struct nfs4_getdeviceinfo_res *res)
+{
+ struct xdr_stream xdr;
+ struct compound_hdr hdr;
+ int status;
+
+ xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
+ status = decode_compound_hdr(&xdr, &hdr);
+ if (status != 0)
+ goto out;
+ status = decode_sequence(&xdr, &res->seq_res, rqstp);
+ if (status != 0)
+ goto out;
+ status = decode_getdeviceinfo(&xdr, res->pdev);
+out:
+ return status;
+}
+
+/*
+ * Decode LAYOUTGET response
+ */
+static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp, uint32_t *p,
+ struct nfs4_layoutget_res *res)
+{
+ struct xdr_stream xdr;
+ struct compound_hdr hdr;
+ int status;
+
+ xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
+ status = decode_compound_hdr(&xdr, &hdr);
+ if (status)
+ goto out;
+ status = decode_sequence(&xdr, &res->seq_res, rqstp);
+ if (status)
+ goto out;
+ status = decode_putfh(&xdr);
+ if (status)
+ goto out;
+ status = decode_layoutget(&xdr, rqstp, res);
+out:
+ return status;
+}
#endif /* CONFIG_NFS_V4_1 */
__be32 *nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
PROC(SEQUENCE, enc_sequence, dec_sequence),
PROC(GET_LEASE_TIME, enc_get_lease_time, dec_get_lease_time),
PROC(RECLAIM_COMPLETE, enc_reclaim_complete, dec_reclaim_complete),
+ PROC(GETDEVICEINFO, enc_getdeviceinfo, dec_getdeviceinfo),
+ PROC(LAYOUTGET, enc_layoutget, dec_layoutget),
#endif /* CONFIG_NFS_V4_1 */
};
printk(KERN_ERR "%s id 0 is reserved\n", __func__);
return status;
}
+ if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
+ printk(KERN_ERR "%s Layout driver must provide "
+ "alloc_lseg and free_lseg.\n", __func__);
+ return status;
+ }
spin_lock(&pnfs_spinlock);
tmp = find_pnfs_driver_locked(ld_type->id);
}
EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
+/*
+ * pNFS client layout cache
+ */
+
static void
get_layout_hdr_locked(struct pnfs_layout_hdr *lo)
{
}
}
-static void
+void
put_layout_hdr(struct inode *inode)
{
spin_lock(&inode->i_lock);
struct inode *ino = lseg->layout->inode;
dprintk("--> %s\n", __func__);
- kfree(lseg);
+ NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
/* Matched by get_layout_hdr_locked in pnfs_insert_layout */
put_layout_hdr(ino);
}
/* List does not take a reference, so no need for put here */
list_del_init(&lo->layouts);
spin_unlock(&clp->cl_lock);
+ write_seqlock(&lo->seqlock);
+ clear_bit(NFS_LAYOUT_STATEID_SET, &lo->state);
+ write_sequnlock(&lo->seqlock);
dprintk("%s:Return\n", __func__);
}
}
}
-static void pnfs_insert_layout(struct pnfs_layout_hdr *lo,
- struct pnfs_layout_segment *lseg);
+/* update lo->stateid with new if is more recent
+ *
+ * lo->stateid could be the open stateid, in which case we just use what given.
+ */
+static void
+pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
+ const nfs4_stateid *new)
+{
+ nfs4_stateid *old = &lo->stateid;
+ bool overwrite = false;
+
+ write_seqlock(&lo->seqlock);
+ if (!test_bit(NFS_LAYOUT_STATEID_SET, &lo->state) ||
+ memcmp(old->stateid.other, new->stateid.other, sizeof(new->stateid.other)))
+ overwrite = true;
+ else {
+ u32 oldseq, newseq;
+
+ oldseq = be32_to_cpu(old->stateid.seqid);
+ newseq = be32_to_cpu(new->stateid.seqid);
+ if ((int)(newseq - oldseq) > 0)
+ overwrite = true;
+ }
+ if (overwrite)
+ memcpy(&old->stateid, &new->stateid, sizeof(new->stateid));
+ write_sequnlock(&lo->seqlock);
+}
+
+static void
+pnfs_layout_from_open_stateid(struct pnfs_layout_hdr *lo,
+ struct nfs4_state *state)
+{
+ int seq;
+
+ dprintk("--> %s\n", __func__);
+ write_seqlock(&lo->seqlock);
+ do {
+ seq = read_seqbegin(&state->seqlock);
+ memcpy(lo->stateid.data, state->stateid.data,
+ sizeof(state->stateid.data));
+ } while (read_seqretry(&state->seqlock, seq));
+ set_bit(NFS_LAYOUT_STATEID_SET, &lo->state);
+ write_sequnlock(&lo->seqlock);
+ dprintk("<-- %s\n", __func__);
+}
+
+void
+pnfs_get_layout_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
+ struct nfs4_state *open_state)
+{
+ int seq;
-/* Get layout from server. */
+ dprintk("--> %s\n", __func__);
+ do {
+ seq = read_seqbegin(&lo->seqlock);
+ if (!test_bit(NFS_LAYOUT_STATEID_SET, &lo->state)) {
+ /* This will trigger retry of the read */
+ pnfs_layout_from_open_stateid(lo, open_state);
+ } else
+ memcpy(dst->data, lo->stateid.data,
+ sizeof(lo->stateid.data));
+ } while (read_seqretry(&lo->seqlock, seq));
+ dprintk("<-- %s\n", __func__);
+}
+
+/*
+* Get layout from server.
+* for now, assume that whole file layouts are requested.
+* arg->offset: 0
+* arg->length: all ones
+*/
static struct pnfs_layout_segment *
send_layoutget(struct pnfs_layout_hdr *lo,
struct nfs_open_context *ctx,
u32 iomode)
{
struct inode *ino = lo->inode;
- struct pnfs_layout_segment *lseg;
+ struct nfs_server *server = NFS_SERVER(ino);
+ struct nfs4_layoutget *lgp;
+ struct pnfs_layout_segment *lseg = NULL;
+
+ dprintk("--> %s\n", __func__);
- /* Lets pretend we sent LAYOUTGET and got a response */
- lseg = kzalloc(sizeof(*lseg), GFP_KERNEL);
+ BUG_ON(ctx == NULL);
+ lgp = kzalloc(sizeof(*lgp), GFP_KERNEL);
+ if (lgp == NULL) {
+ put_layout_hdr(lo->inode);
+ return NULL;
+ }
+ lgp->args.minlength = NFS4_MAX_UINT64;
+ lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
+ lgp->args.range.iomode = iomode;
+ lgp->args.range.offset = 0;
+ lgp->args.range.length = NFS4_MAX_UINT64;
+ lgp->args.type = server->pnfs_curr_ld->id;
+ lgp->args.inode = ino;
+ lgp->args.ctx = get_nfs_open_context(ctx);
+ lgp->lsegpp = &lseg;
+
+ /* Synchronously retrieve layout information from server and
+ * store in lseg.
+ */
+ nfs4_proc_layoutget(lgp);
if (!lseg) {
+ /* remember that LAYOUTGET failed and suspend trying */
set_bit(lo_fail_bit(iomode), &lo->state);
- spin_lock(&ino->i_lock);
- put_layout_hdr_locked(lo);
- spin_unlock(&ino->i_lock);
- return NULL;
}
- init_lseg(lo, lseg);
- lseg->iomode = IOMODE_RW;
- spin_lock(&ino->i_lock);
- pnfs_insert_layout(lo, lseg);
- put_layout_hdr_locked(lo);
- spin_unlock(&ino->i_lock);
return lseg;
}
+/*
+ * Compare two layout segments for sorting into layout cache.
+ * We want to preferentially return RW over RO layouts, so ensure those
+ * are seen first.
+ */
+static s64
+cmp_layout(u32 iomode1, u32 iomode2)
+{
+ /* read > read/write */
+ return (int)(iomode2 == IOMODE_READ) - (int)(iomode1 == IOMODE_READ);
+}
+
static void
pnfs_insert_layout(struct pnfs_layout_hdr *lo,
struct pnfs_layout_segment *lseg)
{
+ struct pnfs_layout_segment *lp;
+ int found = 0;
+
dprintk("%s:Begin\n", __func__);
assert_spin_locked(&lo->inode->i_lock);
list_add_tail(&lo->layouts, &clp->cl_layouts);
spin_unlock(&clp->cl_lock);
}
- get_layout_hdr_locked(lo);
- /* STUB - add the constructed lseg if necessary */
- if (list_empty(&lo->segs)) {
+ list_for_each_entry(lp, &lo->segs, fi_list) {
+ if (cmp_layout(lp->range.iomode, lseg->range.iomode) > 0)
+ continue;
+ list_add_tail(&lseg->fi_list, &lp->fi_list);
+ dprintk("%s: inserted lseg %p "
+ "iomode %d offset %llu length %llu before "
+ "lp %p iomode %d offset %llu length %llu\n",
+ __func__, lseg, lseg->range.iomode,
+ lseg->range.offset, lseg->range.length,
+ lp, lp->range.iomode, lp->range.offset,
+ lp->range.length);
+ found = 1;
+ break;
+ }
+ if (!found) {
list_add_tail(&lseg->fi_list, &lo->segs);
- dprintk("%s: inserted lseg %p iomode %d at tail\n",
- __func__, lseg, lseg->iomode);
- } else {
- /* There is no harm for the moment in calling this
- * with the lock held, and the call will be removed
- * with the STUB.
- */
- put_lseg(lseg);
+ dprintk("%s: inserted lseg %p "
+ "iomode %d offset %llu length %llu at tail\n",
+ __func__, lseg, lseg->range.iomode,
+ lseg->range.offset, lseg->range.length);
}
+ get_layout_hdr_locked(lo);
dprintk("%s:Return\n", __func__);
}
lo->refcount = 1;
INIT_LIST_HEAD(&lo->layouts);
INIT_LIST_HEAD(&lo->segs);
+ seqlock_init(&lo->seqlock);
lo->inode = ino;
return lo;
}
return nfsi->layout;
}
-/* STUB - LAYOUTGET never succeeds, so cache is empty */
+/*
+ * iomode matching rules:
+ * iomode lseg match
+ * ----- ----- -----
+ * ANY READ true
+ * ANY RW true
+ * RW READ false
+ * RW RW true
+ * READ READ true
+ * READ RW true
+ */
+static int
+is_matching_lseg(struct pnfs_layout_segment *lseg, u32 iomode)
+{
+ return (iomode != IOMODE_RW || lseg->range.iomode == IOMODE_RW);
+}
+
+/*
+ * lookup range in layout
+ */
static struct pnfs_layout_segment *
pnfs_has_layout(struct pnfs_layout_hdr *lo, u32 iomode)
{
- return NULL;
+ struct pnfs_layout_segment *lseg, *ret = NULL;
+
+ dprintk("%s:Begin\n", __func__);
+
+ assert_spin_locked(&lo->inode->i_lock);
+ list_for_each_entry(lseg, &lo->segs, fi_list) {
+ if (is_matching_lseg(lseg, iomode)) {
+ ret = lseg;
+ break;
+ }
+ if (cmp_layout(iomode, lseg->range.iomode) > 0)
+ break;
+ }
+
+ dprintk("%s:Return lseg %p ref %d\n",
+ __func__, ret, ret ? atomic_read(&ret->kref.refcount) : 0);
+ return ret;
}
/*
if (test_bit(lo_fail_bit(iomode), &nfsi->layout->state))
goto out_unlock;
- get_layout_hdr_locked(lo);
+ get_layout_hdr_locked(lo); /* Matched in nfs4_layoutget_release */
spin_unlock(&ino->i_lock);
lseg = send_layoutget(lo, ctx, iomode);
spin_unlock(&ino->i_lock);
goto out;
}
+
+int
+pnfs_layout_process(struct nfs4_layoutget *lgp)
+{
+ struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
+ struct nfs4_layoutget_res *res = &lgp->res;
+ struct pnfs_layout_segment *lseg;
+ struct inode *ino = lo->inode;
+ int status = 0;
+
+ /* Inject layout blob into I/O device driver */
+ lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res);
+ if (!lseg || IS_ERR(lseg)) {
+ if (!lseg)
+ status = -ENOMEM;
+ else
+ status = PTR_ERR(lseg);
+ dprintk("%s: Could not allocate layout: error %d\n",
+ __func__, status);
+ goto out;
+ }
+
+ spin_lock(&ino->i_lock);
+ init_lseg(lo, lseg);
+ lseg->range = res->range;
+ *lgp->lsegpp = lseg;
+ pnfs_insert_layout(lo, lseg);
+
+ /* Done processing layoutget. Set the layout stateid */
+ pnfs_set_layout_stateid(lo, &res->stateid);
+ spin_unlock(&ino->i_lock);
+out:
+ return status;
+}
+
+/*
+ * Device ID cache. Currently supports one layout type per struct nfs_client.
+ * Add layout type to the lookup key to expand to support multiple types.
+ */
+int
+pnfs_alloc_init_deviceid_cache(struct nfs_client *clp,
+ void (*free_callback)(struct pnfs_deviceid_node *))
+{
+ struct pnfs_deviceid_cache *c;
+
+ c = kzalloc(sizeof(struct pnfs_deviceid_cache), GFP_KERNEL);
+ if (!c)
+ return -ENOMEM;
+ spin_lock(&clp->cl_lock);
+ if (clp->cl_devid_cache != NULL) {
+ atomic_inc(&clp->cl_devid_cache->dc_ref);
+ dprintk("%s [kref [%d]]\n", __func__,
+ atomic_read(&clp->cl_devid_cache->dc_ref));
+ kfree(c);
+ } else {
+ /* kzalloc initializes hlists */
+ spin_lock_init(&c->dc_lock);
+ atomic_set(&c->dc_ref, 1);
+ c->dc_free_callback = free_callback;
+ clp->cl_devid_cache = c;
+ dprintk("%s [new]\n", __func__);
+ }
+ spin_unlock(&clp->cl_lock);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pnfs_alloc_init_deviceid_cache);
+
+/*
+ * Called from pnfs_layoutdriver_type->free_lseg
+ * last layout segment reference frees deviceid
+ */
+void
+pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
+ struct pnfs_deviceid_node *devid)
+{
+ struct nfs4_deviceid *id = &devid->de_id;
+ struct pnfs_deviceid_node *d;
+ struct hlist_node *n;
+ long h = nfs4_deviceid_hash(id);
+
+ dprintk("%s [%d]\n", __func__, atomic_read(&devid->de_ref));
+ if (!atomic_dec_and_lock(&devid->de_ref, &c->dc_lock))
+ return;
+
+ hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[h], de_node)
+ if (!memcmp(&d->de_id, id, sizeof(*id))) {
+ hlist_del_rcu(&d->de_node);
+ spin_unlock(&c->dc_lock);
+ synchronize_rcu();
+ c->dc_free_callback(devid);
+ return;
+ }
+ spin_unlock(&c->dc_lock);
+ /* Why wasn't it found in the list? */
+ BUG();
+}
+EXPORT_SYMBOL_GPL(pnfs_put_deviceid);
+
+/* Find and reference a deviceid */
+struct pnfs_deviceid_node *
+pnfs_find_get_deviceid(struct pnfs_deviceid_cache *c, struct nfs4_deviceid *id)
+{
+ struct pnfs_deviceid_node *d;
+ struct hlist_node *n;
+ long hash = nfs4_deviceid_hash(id);
+
+ dprintk("--> %s hash %ld\n", __func__, hash);
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[hash], de_node) {
+ if (!memcmp(&d->de_id, id, sizeof(*id))) {
+ if (!atomic_inc_not_zero(&d->de_ref)) {
+ goto fail;
+ } else {
+ rcu_read_unlock();
+ return d;
+ }
+ }
+ }
+fail:
+ rcu_read_unlock();
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(pnfs_find_get_deviceid);
+
+/*
+ * Add a deviceid to the cache.
+ * GETDEVICEINFOs for same deviceid can race. If deviceid is found, discard new
+ */
+struct pnfs_deviceid_node *
+pnfs_add_deviceid(struct pnfs_deviceid_cache *c, struct pnfs_deviceid_node *new)
+{
+ struct pnfs_deviceid_node *d;
+ long hash = nfs4_deviceid_hash(&new->de_id);
+
+ dprintk("--> %s hash %ld\n", __func__, hash);
+ spin_lock(&c->dc_lock);
+ d = pnfs_find_get_deviceid(c, &new->de_id);
+ if (d) {
+ spin_unlock(&c->dc_lock);
+ dprintk("%s [discard]\n", __func__);
+ c->dc_free_callback(new);
+ return d;
+ }
+ INIT_HLIST_NODE(&new->de_node);
+ atomic_set(&new->de_ref, 1);
+ hlist_add_head_rcu(&new->de_node, &c->dc_deviceids[hash]);
+ spin_unlock(&c->dc_lock);
+ dprintk("%s [new]\n", __func__);
+ return new;
+}
+EXPORT_SYMBOL_GPL(pnfs_add_deviceid);
+
+void
+pnfs_put_deviceid_cache(struct nfs_client *clp)
+{
+ struct pnfs_deviceid_cache *local = clp->cl_devid_cache;
+
+ dprintk("--> %s cl_devid_cache %p\n", __func__, clp->cl_devid_cache);
+ if (atomic_dec_and_lock(&local->dc_ref, &clp->cl_lock)) {
+ int i;
+ /* Verify cache is empty */
+ for (i = 0; i < NFS4_DEVICE_ID_HASH_SIZE; i++)
+ BUG_ON(!hlist_empty(&local->dc_deviceids[i]));
+ clp->cl_devid_cache = NULL;
+ spin_unlock(&clp->cl_lock);
+ kfree(local);
+ }
+}
+EXPORT_SYMBOL_GPL(pnfs_put_deviceid_cache);
struct pnfs_layout_segment {
struct list_head fi_list;
- u32 iomode;
+ struct pnfs_layout_range range;
struct kref kref;
struct pnfs_layout_hdr *layout;
};
enum {
NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
+ NFS_LAYOUT_STATEID_SET, /* have a valid layout stateid */
};
/* Per-layout driver specific registration structure */
struct module *owner;
int (*initialize_mountpoint) (struct nfs_server *);
int (*uninitialize_mountpoint) (struct nfs_server *);
+ struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
+ void (*free_lseg) (struct pnfs_layout_segment *lseg);
};
struct pnfs_layout_hdr {
unsigned long refcount;
struct list_head layouts; /* other client layouts */
struct list_head segs; /* layout segments list */
+ seqlock_t seqlock; /* Protects the stateid */
+ nfs4_stateid stateid;
unsigned long state;
struct inode *inode;
};
+struct pnfs_device {
+ struct nfs4_deviceid dev_id;
+ unsigned int layout_type;
+ unsigned int mincount;
+ struct page **pages;
+ void *area;
+ unsigned int pgbase;
+ unsigned int pglen;
+};
+
+/*
+ * Device ID RCU cache. A device ID is unique per client ID and layout type.
+ */
+#define NFS4_DEVICE_ID_HASH_BITS 5
+#define NFS4_DEVICE_ID_HASH_SIZE (1 << NFS4_DEVICE_ID_HASH_BITS)
+#define NFS4_DEVICE_ID_HASH_MASK (NFS4_DEVICE_ID_HASH_SIZE - 1)
+
+static inline u32
+nfs4_deviceid_hash(struct nfs4_deviceid *id)
+{
+ unsigned char *cptr = (unsigned char *)id->data;
+ unsigned int nbytes = NFS4_DEVICEID4_SIZE;
+ u32 x = 0;
+
+ while (nbytes--) {
+ x *= 37;
+ x += *cptr++;
+ }
+ return x & NFS4_DEVICE_ID_HASH_MASK;
+}
+
+struct pnfs_deviceid_node {
+ struct hlist_node de_node;
+ struct nfs4_deviceid de_id;
+ atomic_t de_ref;
+};
+
+struct pnfs_deviceid_cache {
+ spinlock_t dc_lock;
+ atomic_t dc_ref;
+ void (*dc_free_callback)(struct pnfs_deviceid_node *);
+ struct hlist_head dc_deviceids[NFS4_DEVICE_ID_HASH_SIZE];
+};
+
+extern int pnfs_alloc_init_deviceid_cache(struct nfs_client *,
+ void (*free_callback)(struct pnfs_deviceid_node *));
+extern void pnfs_put_deviceid_cache(struct nfs_client *);
+extern struct pnfs_deviceid_node *pnfs_find_get_deviceid(
+ struct pnfs_deviceid_cache *,
+ struct nfs4_deviceid *);
+extern struct pnfs_deviceid_node *pnfs_add_deviceid(
+ struct pnfs_deviceid_cache *,
+ struct pnfs_deviceid_node *);
+extern void pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
+ struct pnfs_deviceid_node *devid);
+
extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
+/* nfs4proc.c */
+extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
+ struct pnfs_device *dev);
+extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
+
+/* pnfs.c */
struct pnfs_layout_segment *
pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
enum pnfs_iomode access_type);
void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
void unset_pnfs_layoutdriver(struct nfs_server *);
+int pnfs_layout_process(struct nfs4_layoutget *lgp);
void pnfs_destroy_layout(struct nfs_inode *);
void pnfs_destroy_all_layouts(struct nfs_client *);
+void put_layout_hdr(struct inode *inode);
+void pnfs_get_layout_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
+ struct nfs4_state *open_state);
static inline int lo_fail_bit(u32 iomode)
NFSPROC4_CLNT_SEQUENCE,
NFSPROC4_CLNT_GET_LEASE_TIME,
NFSPROC4_CLNT_RECLAIM_COMPLETE,
+ NFSPROC4_CLNT_LAYOUTGET,
+ NFSPROC4_CLNT_GETDEVICEINFO,
};
/* nfs41 types */
u32 cl_exchange_flags;
struct nfs4_session *cl_session; /* sharred session */
struct list_head cl_layouts;
+ struct pnfs_deviceid_cache *cl_devid_cache; /* pNFS deviceid cache */
#endif /* CONFIG_NFS_V4_1 */
#ifdef CONFIG_NFS_FSCACHE
struct nfs4_sequence_res lr_seq_res;
};
+#define PNFS_LAYOUT_MAXSIZE 4096
+
+struct nfs4_layoutdriver_data {
+ __u32 len;
+ void *buf;
+};
+
+struct pnfs_layout_range {
+ u32 iomode;
+ u64 offset;
+ u64 length;
+};
+
+struct nfs4_layoutget_args {
+ __u32 type;
+ struct pnfs_layout_range range;
+ __u64 minlength;
+ __u32 maxcount;
+ struct inode *inode;
+ struct nfs_open_context *ctx;
+ struct nfs4_sequence_args seq_args;
+};
+
+struct nfs4_layoutget_res {
+ __u32 return_on_close;
+ struct pnfs_layout_range range;
+ __u32 type;
+ nfs4_stateid stateid;
+ struct nfs4_layoutdriver_data layout;
+ struct nfs4_sequence_res seq_res;
+};
+
+struct nfs4_layoutget {
+ struct nfs4_layoutget_args args;
+ struct nfs4_layoutget_res res;
+ struct pnfs_layout_segment **lsegpp;
+ int status;
+};
+
+struct nfs4_getdeviceinfo_args {
+ struct pnfs_device *pdev;
+ struct nfs4_sequence_args seq_args;
+};
+
+struct nfs4_getdeviceinfo_res {
+ struct pnfs_device *pdev;
+ struct nfs4_sequence_res seq_res;
+};
+
/*
* Arguments to the open call.
*/
projects / mv-sheeva.git / commitdiff