--- /dev/null
+/* NFSv4.1 client for Windows
+ * Copyright © 2012 The Regents of the University of Michigan
+ *
+ * Olga Kornievskaia <aglo@umich.edu>
+ * Casey Bodley <cbodley@umich.edu>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * without any warranty; without even the implied warranty of merchantability
+ * or fitness for a particular purpose. See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ */
+
+#include <stdio.h>
+#include <process.h>
+
+#include "nfs41_ops.h"
+#include "util.h"
+#include "daemon_debug.h"
+
+
+#define IOLVL 2 /* dprintf level for pnfs io logging */
+
+#define file_layout_entry(pos) list_container(pos, pnfs_file_layout, layout.entry)
+
+typedef struct __pnfs_io_pattern {
+ struct __pnfs_io_thread *threads;
+ nfs41_root *root;
+ nfs41_path_fh *meta_file;
+ const stateid_arg *stateid;
+ pnfs_layout_state *state;
+ unsigned char *buffer;
+ uint64_t offset_start;
+ uint64_t offset_end;
+ uint32_t count;
+ uint32_t default_lease;
+} pnfs_io_pattern;
+
+typedef struct __pnfs_io_thread {
+ nfs41_write_verf verf;
+ pnfs_io_pattern *pattern;
+ pnfs_file_layout *layout;
+ nfs41_path_fh *file;
+ uint64_t offset;
+ uint32_t id;
+ enum stable_how4 stable;
+} pnfs_io_thread;
+
+typedef struct __pnfs_io_unit {
+ unsigned char *buffer;
+ uint64_t offset;
+ uint64_t length;
+ uint32_t stripeid;
+ uint32_t serverid;
+} pnfs_io_unit;
+
+typedef uint32_t (WINAPI *pnfs_io_thread_fn)(void*);
+
+
+static enum pnfs_status stripe_next_unit(
+ IN const pnfs_file_layout *layout,
+ IN uint32_t stripeid,
+ IN uint64_t *position,
+ IN uint64_t offset_end,
+ OUT pnfs_io_unit *io);
+
+/* 13.4.2. Interpreting the File Layout Using Sparse Packing
+ * http://tools.ietf.org/html/rfc5661#section-13.4.2 */
+
+static enum pnfs_status get_sparse_fh(
+ IN pnfs_file_layout *layout,
+ IN nfs41_path_fh *meta_file,
+ IN uint32_t stripeid,
+ OUT nfs41_path_fh **file_out)
+{
+ const uint32_t filehandle_count = layout->filehandles.count;
+ const uint32_t server_count = layout->device->servers.count;
+ enum pnfs_status status = PNFS_SUCCESS;
+
+ if (filehandle_count == server_count) {
+ const uint32_t serverid = data_server_index(layout->device, stripeid);
+ *file_out = &layout->filehandles.arr[serverid];
+ } else if (filehandle_count == 1) {
+ *file_out = &layout->filehandles.arr[0];
+ } else if (filehandle_count == 0) {
+ *file_out = meta_file;
+ } else {
+ eprintf("invalid sparse layout! has %u file handles "
+ "and %u servers\n", filehandle_count, server_count);
+ status = PNFSERR_INVALID_FH_LIST;
+ }
+ return status;
+}
+
+/* 13.4.3. Interpreting the File Layout Using Dense Packing
+* http://tools.ietf.org/html/rfc5661#section-13.4.3 */
+
+static enum pnfs_status get_dense_fh(
+ IN pnfs_file_layout *layout,
+ IN uint32_t stripeid,
+ OUT nfs41_path_fh **file_out)
+{
+ const uint32_t filehandle_count = layout->filehandles.count;
+ const uint32_t stripe_count = layout->device->stripes.count;
+ enum pnfs_status status = PNFS_SUCCESS;
+
+ if (filehandle_count == stripe_count) {
+ *file_out = &layout->filehandles.arr[stripeid];
+ } else {
+ eprintf("invalid dense layout! has %u file handles "
+ "and %u stripes\n", filehandle_count, stripe_count);
+ status = PNFSERR_INVALID_FH_LIST;
+ }
+ return status;
+}
+
+static __inline bool_t layout_compatible(
+ IN const pnfs_layout *layout,
+ IN enum pnfs_iomode iomode,
+ IN uint64_t position)
+{
+ return layout->iomode >= iomode
+ && layout->offset <= position
+ && position < layout->offset + layout->length;
+}
+
+/* count stripes for all layout segments that intersect the range
+ * and have not been covered by previous segments */
+static uint32_t thread_count(
+ IN pnfs_layout_state *state,
+ IN enum pnfs_iomode iomode,
+ IN uint64_t offset,
+ IN uint64_t length)
+{
+ uint64_t position = offset;
+ struct list_entry *entry;
+ uint32_t count = 0;
+
+ list_for_each(entry, &state->layouts) {
+ pnfs_file_layout *layout = file_layout_entry(entry);
+
+ if (!layout_compatible(&layout->layout, iomode, position))
+ continue;
+
+ position = layout->layout.offset + layout->layout.length;
+ count += layout->device->stripes.count;
+ }
+ return count;
+}
+
+static enum pnfs_status thread_init(
+ IN pnfs_io_pattern *pattern,
+ IN pnfs_io_thread *thread,
+ IN pnfs_file_layout *layout,
+ IN uint32_t stripeid,
+ IN uint64_t offset)
+{
+ thread->pattern = pattern;
+ thread->layout = layout;
+ thread->stable = FILE_SYNC4;
+ thread->offset = offset;
+ thread->id = stripeid;
+
+ return is_dense(layout) ? get_dense_fh(layout, stripeid, &thread->file)
+ : get_sparse_fh(layout, pattern->meta_file, stripeid, &thread->file);
+}
+
+static enum pnfs_status pattern_threads_init(
+ IN pnfs_io_pattern *pattern,
+ IN enum pnfs_iomode iomode,
+ IN uint64_t offset,
+ IN uint64_t length)
+{
+ pnfs_io_unit io;
+ uint64_t position = offset;
+ struct list_entry *entry;
+ uint32_t s, t = 0;
+ enum pnfs_status status = PNFS_SUCCESS;
+
+ list_for_each(entry, &pattern->state->layouts) {
+ pnfs_file_layout *layout = file_layout_entry(entry);
+
+ if (!layout_compatible(&layout->layout, iomode, position))
+ continue;
+
+ for (s = 0; s < layout->device->stripes.count; s++) {
+ uint64_t off = position;
+
+ /* does the range contain this stripe? */
+ status = stripe_next_unit(layout, s, &off, offset + length, &io);
+ if (status != PNFS_PENDING)
+ continue;
+
+ if (t >= pattern->count) { /* miscounted threads needed? */
+ status = PNFSERR_NO_LAYOUT;
+ goto out;
+ }
+
+ status = thread_init(pattern, &pattern->threads[t++], layout, s, off);
+ if (status)
+ goto out;
+ }
+ position = layout->layout.offset + layout->layout.length;
+ }
+
+ if (position < offset + length) {
+ /* unable to satisfy the entire range */
+ status = PNFSERR_NO_LAYOUT;
+ goto out;
+ }
+
+ /* update the pattern with the actual number of threads used */
+ pattern->count = t;
+out:
+ return status;
+}
+
+static enum pnfs_status pattern_init(
+ IN pnfs_io_pattern *pattern,
+ IN nfs41_root *root,
+ IN nfs41_path_fh *meta_file,
+ IN const stateid_arg *stateid,
+ IN pnfs_layout_state *state,
+ IN unsigned char *buffer,
+ IN enum pnfs_iomode iomode,
+ IN uint64_t offset,
+ IN uint64_t length,
+ IN uint32_t default_lease)
+{
+ enum pnfs_status status;
+
+ /* calculate an upper bound on the number of threads to allocate */
+ pattern->count = thread_count(state, iomode, offset, length);
+ pattern->threads = calloc(pattern->count, sizeof(pnfs_io_thread));
+ if (pattern->threads == NULL) {
+ status = PNFSERR_RESOURCES;
+ goto out;
+ }
+
+ /* information shared between threads */
+ pattern->root = root;
+ pattern->meta_file = meta_file;
+ pattern->stateid = stateid;
+ pattern->state = state;
+ pattern->buffer = buffer;
+ pattern->offset_start = offset;
+ pattern->offset_end = offset + length;
+ pattern->default_lease = default_lease;
+
+ /* initialize a thread for every stripe necessary to cover the range */
+ status = pattern_threads_init(pattern, iomode, offset, length);
+ if (status)
+ goto out_err_free;
+
+ /* take a reference on the layout so we don't return it during io */
+ pnfs_layout_io_start(state);
+out:
+ return status;
+
+out_err_free:
+ free(pattern->threads);
+ pattern->threads = NULL;
+ goto out;
+}
+
+static void pattern_free(
+ IN pnfs_io_pattern *pattern)
+{
+ /* inform the layout that our io is finished */
+ pnfs_layout_io_finished(pattern->state);
+ free(pattern->threads);
+}
+
+static __inline uint64_t positive_remainder(
+ IN uint64_t dividend,
+ IN uint32_t divisor)
+{
+ const uint64_t remainder = dividend % divisor;
+ return remainder < divisor ? remainder : remainder + divisor;
+}
+
+/* return the next unit of the given stripeid */
+static enum pnfs_status stripe_next_unit(
+ IN const pnfs_file_layout *layout,
+ IN uint32_t stripeid,
+ IN uint64_t *position,
+ IN uint64_t offset_end,
+ OUT pnfs_io_unit *io)
+{
+ const uint32_t unit_size = layout_unit_size(layout);
+ const uint32_t stripe_count = layout->device->stripes.count;
+ uint64_t sui = stripe_unit_number(layout, *position, unit_size);
+
+ /* advance to the desired stripeid */
+ sui += abs(stripeid - stripe_index(layout, sui, stripe_count));
+
+ io->offset = stripe_unit_offset(layout, sui, unit_size);
+ if (io->offset < *position) /* don't start before position */
+ io->offset = *position;
+ else
+ *position = io->offset;
+
+ io->length = stripe_unit_offset(layout, sui + 1, unit_size);
+ if (io->length > offset_end) /* don't end past offset_end */
+ io->length = offset_end;
+
+ if (io->offset >= io->length) /* nothing to do, return success */
+ return PNFS_SUCCESS;
+
+ io->length -= io->offset;
+
+ if (is_dense(layout)) {
+ const uint64_t rel_offset = io->offset - layout->pattern_offset;
+ const uint64_t remainder = positive_remainder(rel_offset, unit_size);
+ const uint32_t stride = unit_size * stripe_count;
+
+ io->offset = (rel_offset / stride) * unit_size + remainder;
+ }
+ return PNFS_PENDING;
+}
+
+static enum pnfs_status thread_next_unit(
+ IN pnfs_io_thread *thread,
+ OUT pnfs_io_unit *io)
+{
+ pnfs_io_pattern *pattern = thread->pattern;
+ pnfs_layout_state *state = pattern->state;
+ enum pnfs_status status;
+
+ AcquireSRWLockShared(&state->lock);
+
+ /* stop io if the layout is recalled */
+ status = pnfs_layout_recall_status(state, &thread->layout->layout);
+ if (status)
+ goto out_unlock;
+
+ status = stripe_next_unit(thread->layout, thread->id,
+ &thread->offset, pattern->offset_end, io);
+ if (status == PNFS_PENDING)
+ io->buffer = pattern->buffer + thread->offset - pattern->offset_start;
+
+out_unlock:
+ ReleaseSRWLockShared(&state->lock);
+ return status;
+}
+
+static enum pnfs_status thread_data_server(
+ IN pnfs_io_thread *thread,
+ OUT pnfs_data_server **server_out)
+{
+ pnfs_file_device *device = thread->layout->device;
+ const uint32_t serverid = data_server_index(device, thread->id);
+
+ if (serverid >= device->servers.count)
+ return PNFSERR_INVALID_DS_INDEX;
+
+ *server_out = &device->servers.arr[serverid];
+ return PNFS_SUCCESS;
+}
+
+static enum pnfs_status pattern_join(
+ IN HANDLE *threads,
+ IN DWORD count)
+{
+ DWORD status;
+ /* WaitForMultipleObjects() supports a maximum of 64 objects */
+ while (count) {
+ const DWORD n = min(count, MAXIMUM_WAIT_OBJECTS);
+ status = WaitForMultipleObjects(n, threads, TRUE, INFINITE);
+ if (status != WAIT_OBJECT_0)
+ return PNFSERR_RESOURCES;
+
+ count -= n;
+ threads += n;
+ }
+ return PNFS_SUCCESS;
+}
+
+static enum pnfs_status pattern_fork(
+ IN pnfs_io_pattern *pattern,
+ IN pnfs_io_thread_fn thread_fn)
+{
+ HANDLE *threads;
+ uint32_t i;
+ enum pnfs_status status = PNFS_SUCCESS;
+
+ if (pattern->count == 0)
+ goto out;
+
+ if (pattern->count == 1) {
+ /* no need to fork if there's only 1 thread */
+ status = (enum pnfs_status)thread_fn(pattern->threads);
+ goto out;
+ }
+
+ /* create a thread for each unit that has actual io */
+ threads = calloc(pattern->count, sizeof(HANDLE));
+ if (threads == NULL) {
+ status = PNFSERR_RESOURCES;
+ goto out;
+ }
+
+ for (i = 0; i < pattern->count; i++) {
+ threads[i] = (HANDLE)_beginthreadex(NULL, 0,
+ thread_fn, &pattern->threads[i], 0, NULL);
+ if (threads[i] == NULL) {
+ eprintf("_beginthreadex() failed with %d\n", GetLastError());
+ pattern->count = i; /* join any threads already started */
+ break;
+ }
+ }
+
+ /* wait on all threads to finish */
+ status = pattern_join(threads, pattern->count);
+ if (status) {
+ eprintf("pattern_join() failed with %s\n", pnfs_error_string(status));
+ goto out;
+ }
+
+ for (i = 0; i < pattern->count; i++) {
+ /* keep track of the most severe error returned by a thread */
+ DWORD exitcode;
+ if (GetExitCodeThread(threads[i], &exitcode))
+ status = max(status, (enum pnfs_status)exitcode);
+
+ CloseHandle(threads[i]);
+ }
+
+ free(threads);
+out:
+ return status;
+}
+
+static uint64_t pattern_bytes_transferred(
+ IN pnfs_io_pattern *pattern,
+ OUT OPTIONAL enum stable_how4 *stable)
+{
+ uint64_t lowest_offset = pattern->offset_end;
+ uint32_t i;
+
+ if (stable) *stable = FILE_SYNC4;
+
+ for (i = 0; i < pattern->count; i++) {
+ lowest_offset = min(lowest_offset, pattern->threads[i].offset);
+ if (stable) *stable = min(*stable, pattern->threads[i].stable);
+ }
+ return lowest_offset - pattern->offset_start;
+}
+
+
+static enum pnfs_status map_ds_error(
+ IN enum nfsstat4 nfsstat,
+ IN pnfs_layout_state *state,
+ IN const pnfs_file_layout *layout)
+{
+ switch (nfsstat) {
+ case NO_ERROR:
+ return PNFS_SUCCESS;
+
+ /* 13.11 Layout Revocation and Fencing
+ * http://tools.ietf.org/html/rfc5661#section-13.11
+ * if we've been fenced, we'll either get ERR_STALE when we PUTFH
+ * something in layout.filehandles, or ERR_PNFS_NO_LAYOUT when
+ * attempting to READ or WRITE */
+ case NFS4ERR_STALE:
+ case NFS4ERR_PNFS_NO_LAYOUT:
+ dprintf(IOLVL, "data server fencing detected!\n");
+
+ pnfs_layout_recall_fenced(state, &layout->layout);
+
+ /* return CHANGED to prevent any further use of the layout */
+ return PNFSERR_LAYOUT_CHANGED;
+
+ default:
+ return PNFSERR_IO;
+ }
+}
+
+static uint32_t WINAPI file_layout_read_thread(void *args)
+{
+ pnfs_io_unit io;
+ stateid_arg stateid;
+ pnfs_io_thread *thread = (pnfs_io_thread*)args;
+ pnfs_io_pattern *pattern = thread->pattern;
+ pnfs_data_server *server;
+ nfs41_client *client;
+ uint32_t maxreadsize, bytes_read, total_read;
+ enum pnfs_status status;
+ enum nfsstat4 nfsstat;
+ bool_t eof;
+
+ dprintf(IOLVL, "--> file_layout_read_thread(%u)\n", thread->id);
+
+ /* get the data server for this thread */
+ status = thread_data_server(thread, &server);
+ if (status) {
+ eprintf("thread_data_server() failed with %s\n",
+ pnfs_error_string(status));
+ goto out;
+ }
+ /* find or establish a client for this data server */
+ status = pnfs_data_server_client(pattern->root,
+ server, pattern->default_lease, &client);
+ if (status) {
+ eprintf("pnfs_data_server_client() failed with %s\n",
+ pnfs_error_string(status));
+ goto out;
+ }
+
+ memcpy(&stateid, pattern->stateid, sizeof(stateid));
+ stateid.stateid.seqid = 0;
+
+ total_read = 0;
+ while (thread_next_unit(thread, &io) == PNFS_PENDING) {
+ maxreadsize = max_read_size(client->session, &thread->file->fh);
+ if (io.length > maxreadsize)
+ io.length = maxreadsize;
+
+ nfsstat = nfs41_read(client->session, thread->file, &stateid,
+ io.offset, (uint32_t)io.length, io.buffer, &bytes_read, &eof);
+ if (nfsstat) {
+ eprintf("nfs41_read() failed with %s\n",
+ nfs_error_string(nfsstat));
+ status = map_ds_error(nfsstat, pattern->state, thread->layout);
+ break;
+ }
+
+ total_read += bytes_read;
+ thread->offset += bytes_read;
+
+ if (eof) {
+ dprintf(IOLVL, "read thread %u reached eof: offset %llu\n",
+ thread->id, thread->offset);
+ status = total_read ? PNFS_SUCCESS : PNFS_READ_EOF;
+ break;
+ }
+ }
+out:
+ dprintf(IOLVL, "<-- file_layout_read_thread(%u) returning %s\n",
+ thread->id, pnfs_error_string(status));
+ return status;
+}
+
+static uint32_t WINAPI file_layout_write_thread(void *args)
+{
+ pnfs_io_unit io;
+ stateid_arg stateid;
+ pnfs_io_thread *thread = (pnfs_io_thread*)args;
+ pnfs_io_pattern *pattern = thread->pattern;
+ pnfs_data_server *server;
+ nfs41_client *client;
+ const uint64_t offset_start = thread->offset;
+ uint64_t commit_min, commit_max;
+ uint32_t maxwritesize, bytes_written, total_written;
+ enum pnfs_status status;
+ enum nfsstat4 nfsstat;
+
+ dprintf(IOLVL, "--> file_layout_write_thread(%u)\n", thread->id);
+
+ /* get the data server for this thread */
+ status = thread_data_server(thread, &server);
+ if (status) {
+ eprintf("thread_data_server() failed with %s\n",
+ pnfs_error_string(status));
+ goto out;
+ }
+ /* find or establish a client for this data server */
+ status = pnfs_data_server_client(pattern->root,
+ server, pattern->default_lease, &client);
+ if (status) {
+ eprintf("pnfs_data_server_client() failed with %s\n",
+ pnfs_error_string(status));
+ goto out;
+ }
+
+ memcpy(&stateid, pattern->stateid, sizeof(stateid));
+ stateid.stateid.seqid = 0;
+
+ maxwritesize = max_write_size(client->session, &thread->file->fh);
+
+retry_write:
+ thread->offset = offset_start;
+ thread->stable = FILE_SYNC4;
+ commit_min = NFS4_UINT64_MAX;
+ commit_max = 0;
+ total_written = 0;
+
+ while (thread_next_unit(thread, &io) == PNFS_PENDING) {
+ if (io.length > maxwritesize)
+ io.length = maxwritesize;
+
+ nfsstat = nfs41_write(client->session, thread->file, &stateid,
+ io.buffer, (uint32_t)io.length, io.offset, UNSTABLE4,
+ &bytes_written, &thread->verf, NULL);
+ if (nfsstat) {
+ eprintf("nfs41_write() failed with %s\n",
+ nfs_error_string(nfsstat));
+ status = map_ds_error(nfsstat, pattern->state, thread->layout);
+ break;
+ }
+ if (!verify_write(&thread->verf, &thread->stable))
+ goto retry_write;
+
+ total_written += bytes_written;
+ thread->offset += bytes_written;
+
+ /* track the range for commit */
+ if (commit_min > io.offset)
+ commit_min = io.offset;
+ if (commit_max < io.offset + io.length)
+ commit_max = io.offset + io.length;
+ }
+
+ /* nothing to commit */
+ if (commit_max <= commit_min)
+ goto out;
+ /* layout changed; redo all io against metadata server */
+ if (status == PNFSERR_LAYOUT_CHANGED)
+ goto out;
+ /* the data is already in stable storage */
+ if (thread->stable != UNSTABLE4)
+ goto out;
+ /* the metadata server expects us to commit there instead */
+ if (should_commit_to_mds(thread->layout))
+ goto out;
+
+ dprintf(1, "sending COMMIT to data server for offset=%lld len=%lld\n",
+ commit_min, commit_max - commit_min);
+ nfsstat = nfs41_commit(client->session, thread->file,
+ commit_min, (uint32_t)(commit_max - commit_min), 0, &thread->verf, NULL);
+
+ if (nfsstat)
+ status = map_ds_error(nfsstat, pattern->state, thread->layout);
+ else if (!verify_commit(&thread->verf)) {
+ /* resend the writes unless the layout was recalled */
+ if (status != PNFSERR_LAYOUT_RECALLED)
+ goto retry_write;
+ status = PNFSERR_IO;
+ } else {
+ /* on successful commit, leave pnfs_status unchanged; if the
+ * layout was recalled, we still want to return the error */
+ thread->stable = DATA_SYNC4;
+ }
+out:
+ dprintf(IOLVL, "<-- file_layout_write_thread(%u) returning %s\n",
+ thread->id, pnfs_error_string(status));
+ return status;
+}
+
+
+enum pnfs_status pnfs_read(
+ IN nfs41_root *root,
+ IN nfs41_open_state *state,
+ IN stateid_arg *stateid,
+ IN pnfs_layout_state *layout,
+ IN uint64_t offset,
+ IN uint64_t length,
+ OUT unsigned char *buffer_out,
+ OUT ULONG *len_out)
+{
+ pnfs_io_pattern pattern;
+ enum pnfs_status status;
+
+ dprintf(IOLVL, "--> pnfs_read(%llu, %llu)\n", offset, length);
+
+ *len_out = 0;
+
+ AcquireSRWLockExclusive(&layout->lock);
+
+ /* get layouts/devices for the entire range; PNFS_PENDING means we
+ * dropped the lock to send an rpc, so repeat until it succeeds */
+ do {
+ status = pnfs_layout_state_prepare(layout, state->session,
+ &state->file, stateid, PNFS_IOMODE_READ, offset, length);
+ } while (status == PNFS_PENDING);
+
+ if (status == PNFS_SUCCESS) {
+ /* interpret the layout and set up threads for io */
+ status = pattern_init(&pattern, root, &state->file, stateid,
+ layout, buffer_out, PNFS_IOMODE_READ, offset, length,
+ state->session->lease_time);
+ if (status)
+ eprintf("pattern_init() failed with %s\n",
+ pnfs_error_string(status));
+ }
+
+ ReleaseSRWLockExclusive(&layout->lock);
+
+ if (status)
+ goto out;
+
+ status = pattern_fork(&pattern, file_layout_read_thread);
+ if (status != PNFS_SUCCESS && status != PNFS_READ_EOF)
+ goto out_free_pattern;
+
+ *len_out = (ULONG)pattern_bytes_transferred(&pattern, NULL);
+
+out_free_pattern:
+ pattern_free(&pattern);
+out:
+ dprintf(IOLVL, "<-- pnfs_read() returning %s\n",
+ pnfs_error_string(status));
+ return status;
+}
+
+static enum pnfs_status mds_commit(
+ IN nfs41_open_state *state,
+ IN uint64_t offset,
+ IN uint32_t length,
+ IN const pnfs_io_pattern *pattern,
+ OUT nfs41_file_info *info)
+{
+ nfs41_write_verf verf;
+ enum nfsstat4 nfsstat;
+ enum pnfs_status status = PNFS_SUCCESS;
+ uint32_t i;
+
+ nfsstat = nfs41_commit(state->session,
+ &state->file, offset, length, 1, &verf, info);
+ if (nfsstat) {
+ eprintf("nfs41_commit() to mds failed with %s\n",
+ nfs_error_string(nfsstat));
+ status = PNFSERR_IO;
+ goto out;
+ }
+
+ /* 13.7. COMMIT through Metadata Server:
+ * If nfl_util & NFL4_UFLG_COMMIT_THRU_MDS is TRUE, then in order to
+ * maintain the current NFSv4.1 commit and recovery model, the data
+ * servers MUST return a common writeverf verifier in all WRITE
+ * responses for a given file layout, and the metadata server's
+ * COMMIT implementation must return the same writeverf. */
+ for (i = 0; i < pattern->count; i++) {
+ const pnfs_io_thread *thread = &pattern->threads[i];
+ if (thread->stable != UNSTABLE4) /* already committed */
+ continue;
+
+ if (!should_commit_to_mds(thread->layout)) {
+ /* commit to mds is not allowed on this layout */
+ eprintf("mds commit: failed to commit to data server\n");
+ status = PNFSERR_IO;
+ break;
+ }
+ if (memcmp(verf.verf, thread->verf.verf, NFS4_VERIFIER_SIZE) != 0) {
+ eprintf("mds commit verifier doesn't match ds write verifiers\n");
+ status = PNFSERR_IO;
+ break;
+ }
+ }
+out:
+ return status;
+}
+
+static enum pnfs_status layout_commit(
+ IN nfs41_open_state *state,
+ IN pnfs_layout_state *layout,
+ IN uint64_t offset,
+ IN uint64_t length,
+ OUT nfs41_file_info *info)
+{
+ stateid4 layout_stateid;
+ uint64_t last_offset = offset + length - 1;
+ uint64_t *new_last_offset = NULL;
+ enum nfsstat4 nfsstat;
+ enum pnfs_status status = PNFS_SUCCESS;
+
+ AcquireSRWLockExclusive(&state->lock);
+ /* if this is past the current eof, update the open state's
+ * last offset, and pass a pointer to LAYOUTCOMMIT */
+ if (state->pnfs_last_offset < last_offset ||
+ (state->pnfs_last_offset == 0 && last_offset == 0)) {
+ state->pnfs_last_offset = last_offset;
+ new_last_offset = &last_offset;
+ }
+ ReleaseSRWLockExclusive(&state->lock);
+
+ AcquireSRWLockShared(&layout->lock);
+ memcpy(&layout_stateid, &layout->stateid, sizeof(layout_stateid));
+ ReleaseSRWLockShared(&layout->lock);
+
+ dprintf(1, "LAYOUTCOMMIT for offset=%lld len=%lld new_last_offset=%u\n",
+ offset, length, new_last_offset ? 1 : 0);
+ nfsstat = pnfs_rpc_layoutcommit(state->session, &state->file,
+ &layout_stateid, offset, length, new_last_offset, NULL, info);
+ if (nfsstat) {
+ dprintf(IOLVL, "pnfs_rpc_layoutcommit() failed with %s\n",
+ nfs_error_string(nfsstat));
+ status = PNFSERR_IO;
+ }
+ return status;
+}
+
+enum pnfs_status pnfs_write(
+ IN nfs41_root *root,
+ IN nfs41_open_state *state,
+ IN stateid_arg *stateid,
+ IN pnfs_layout_state *layout,
+ IN uint64_t offset,
+ IN uint64_t length,
+ IN unsigned char *buffer,
+ OUT ULONG *len_out,
+ OUT nfs41_file_info *info)
+{
+ pnfs_io_pattern pattern;
+ enum stable_how4 stable;
+ enum pnfs_status status;
+
+ dprintf(IOLVL, "--> pnfs_write(%llu, %llu)\n", offset, length);
+
+ *len_out = 0;
+
+ AcquireSRWLockExclusive(&layout->lock);
+
+ /* get layouts/devices for the entire range; PNFS_PENDING means we
+ * dropped the lock to send an rpc, so repeat until it succeeds */
+ do {
+ status = pnfs_layout_state_prepare(layout, state->session,
+ &state->file, stateid, PNFS_IOMODE_RW, offset, length);
+ } while (status == PNFS_PENDING);
+
+ if (status == PNFS_SUCCESS) {
+ /* interpret the layout and set up threads for io */
+ status = pattern_init(&pattern, root, &state->file, stateid,
+ layout, buffer, PNFS_IOMODE_RW, offset, length,
+ state->session->lease_time);
+ if (status)
+ eprintf("pattern_init() failed with %s\n",
+ pnfs_error_string(status));
+ }
+
+ ReleaseSRWLockExclusive(&layout->lock);
+
+ if (status)
+ goto out;
+
+ status = pattern_fork(&pattern, file_layout_write_thread);
+ /* on layout recall, we still attempt to commit what we wrote */
+ if (status != PNFS_SUCCESS && status != PNFSERR_LAYOUT_RECALLED)
+ goto out_free_pattern;
+
+ *len_out = (ULONG)pattern_bytes_transferred(&pattern, &stable);
+ if (*len_out == 0)
+ goto out_free_pattern;
+
+ if (stable == UNSTABLE4) {
+ /* send COMMIT to the mds and verify against all ds writes */
+ status = mds_commit(state, offset, *len_out, &pattern, info);
+ } else if (stable == DATA_SYNC4) {
+ /* send LAYOUTCOMMIT to sync the metadata */
+ status = layout_commit(state, layout, offset, *len_out, info);
+ } else {
+ /* send a GETATTR to update the cached size */
+ bitmap4 attr_request;
+ nfs41_superblock_getattr_mask(state->file.fh.superblock, &attr_request);
+ nfs41_getattr(state->session, &state->file, &attr_request, info);
+ }
+out_free_pattern:
+ pattern_free(&pattern);
+out:
+ dprintf(IOLVL, "<-- pnfs_write() returning %s\n",
+ pnfs_error_string(status));
+ return status;
+}
\ No newline at end of file
projects / reactos.git / blobdiff