+++ /dev/null
-/*
- * Unix SMB/CIFS implementation.
- * Support for OneFS system interfaces.
- *
- * Copyright (C) Tim Prouty, 2008
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "onefs.h"
-
-#include <ifs/ifs_syscalls.h>
-#include <isi_acl/isi_acl_util.h>
-
-/*
- * Initialize the sm_lock struct before passing it to ifs_createfile.
- */
-static void smlock_init(connection_struct *conn, struct sm_lock *sml,
- bool isexe, uint32_t access_mask, uint32_t share_access,
- uint32_t create_options)
-{
- sml->sm_type.doc = false;
- sml->sm_type.isexe = isexe;
- sml->sm_type.statonly = is_stat_open(access_mask);
- sml->sm_type.access_mask = access_mask;
- sml->sm_type.share_access = share_access;
-
- /*
- * private_options was previously used for DENY_DOS/DENY_FCB checks in
- * the kernel, but are now properly handled by fcb_or_dos_open. In
- * these cases, ifs_createfile will return a sharing violation, which
- * gives fcb_or_dos_open the chance to open a duplicate file handle.
- */
- sml->sm_type.private_options = 0;
-
- /* 1 second delay is handled in onefs_open.c by deferring the open */
- sml->sm_timeout = timeval_set(0, 0);
-}
-
-static void smlock_dump(int debuglevel, const struct sm_lock *sml)
-{
- if (sml == NULL) {
- DEBUG(debuglevel, ("sml == NULL\n"));
- return;
- }
-
- DEBUG(debuglevel,
- ("smlock: doc=%s, isexec=%s, statonly=%s, access_mask=0x%x, "
- "share_access=0x%x, private_options=0x%x timeout=%d/%d\n",
- sml->sm_type.doc ? "True" : "False",
- sml->sm_type.isexe ? "True" : "False",
- sml->sm_type.statonly ? "True" : "False",
- sml->sm_type.access_mask,
- sml->sm_type.share_access,
- sml->sm_type.private_options,
- (int)sml->sm_timeout.tv_sec,
- (int)sml->sm_timeout.tv_usec));
-}
-
-/**
- * External interface to ifs_createfile
- */
-int onefs_sys_create_file(connection_struct *conn,
- int base_fd,
- const char *path,
- uint32_t access_mask,
- uint32_t open_access_mask,
- uint32_t share_access,
- uint32_t create_options,
- int flags,
- mode_t mode,
- int oplock_request,
- uint64_t id,
- struct security_descriptor *sd,
- uint32_t dos_flags,
- int *granted_oplock)
-{
- struct sm_lock sml, *psml = NULL;
- enum oplock_type onefs_oplock;
- enum oplock_type onefs_granted_oplock = OPLOCK_NONE;
- struct ifs_security_descriptor ifs_sd = {}, *pifs_sd = NULL;
- int secinfo = 0;
- int ret_fd = -1;
- uint32_t onefs_dos_attributes;
-
- /* Setup security descriptor and get secinfo. */
- if (sd != NULL) {
- NTSTATUS status;
-
- secinfo = (get_sec_info(sd) & IFS_SEC_INFO_KNOWN_MASK);
-
- status = onefs_samba_sd_to_sd(secinfo, sd, &ifs_sd, SNUM(conn));
-
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("SD initialization failure: %s",
- nt_errstr(status)));
- errno = EINVAL;
- goto out;
- }
-
- pifs_sd = &ifs_sd;
- }
-
- /* Stripping off private bits will be done for us. */
- onefs_oplock = onefs_samba_oplock_to_oplock(oplock_request);
-
- if (!lp_oplocks(SNUM(conn))) {
- SMB_ASSERT(onefs_oplock == OPLOCK_NONE);
- }
-
- /* Convert samba dos flags to UF_DOS_* attributes. */
- onefs_dos_attributes = dos_attributes_to_stat_dos_flags(dos_flags);
-
- DEBUG(10,("onefs_sys_create_file: base_fd = %d, "
- "open_access_mask = 0x%x, flags = 0x%x, mode = 0x%x, "
- "desired_oplock = %s, id = 0x%x, secinfo = 0x%x, sd = %p, "
- "dos_attributes = 0x%x, path = %s\n", base_fd,
- (unsigned int)open_access_mask,
- (unsigned int)flags,
- (unsigned int)mode,
- onefs_oplock_str(onefs_oplock),
- (unsigned int)id,
- (unsigned int)secinfo, sd,
- (unsigned int)onefs_dos_attributes, path));
-
- /* Initialize smlock struct for files/dirs but not internal opens */
- if (!(oplock_request & INTERNAL_OPEN_ONLY)) {
- smlock_init(conn, &sml, is_executable(path), access_mask,
- share_access, create_options);
- psml = &sml;
- }
-
- smlock_dump(10, psml);
-
- ret_fd = ifs_createfile(base_fd, path,
- (enum ifs_ace_rights)open_access_mask, flags & ~O_ACCMODE, mode,
- onefs_oplock, id, psml, secinfo, pifs_sd, onefs_dos_attributes,
- &onefs_granted_oplock);
-
- DEBUG(10,("onefs_sys_create_file(%s): ret_fd = %d, "
- "onefs_granted_oplock = %s\n",
- ret_fd < 0 ? strerror(errno) : "success", ret_fd,
- onefs_oplock_str(onefs_granted_oplock)));
-
- if (granted_oplock) {
- *granted_oplock =
- onefs_oplock_to_samba_oplock(onefs_granted_oplock);
- }
-
- out:
- aclu_free_sd(pifs_sd, false);
-
- return ret_fd;
-}
-
-/**
- * Only talloc the spill buffer once (reallocing when necessary).
- */
-static char *get_spill_buffer(size_t new_count)
-{
- static int cur_count = 0;
- static char *spill_buffer = NULL;
-
- /* If a sufficiently sized buffer exists, just return. */
- if (new_count <= cur_count) {
- SMB_ASSERT(spill_buffer);
- return spill_buffer;
- }
-
- /* Allocate the first time. */
- if (cur_count == 0) {
- SMB_ASSERT(!spill_buffer);
- spill_buffer = talloc_array(NULL, char, new_count);
- if (spill_buffer) {
- cur_count = new_count;
- }
- return spill_buffer;
- }
-
- /* A buffer exists, but it's not big enough, so realloc. */
- SMB_ASSERT(spill_buffer);
- spill_buffer = talloc_realloc(NULL, spill_buffer, char, new_count);
- if (spill_buffer) {
- cur_count = new_count;
- }
- return spill_buffer;
-}
-
-/**
- * recvfile does zero-copy writes given an fd to write to, and a socket with
- * some data to write. If recvfile read more than it was able to write, it
- * spills the data into a buffer. After first reading any additional data
- * from the socket into the buffer, the spill buffer is then written with a
- * standard pwrite.
- */
-ssize_t onefs_sys_recvfile(int fromfd, int tofd, SMB_OFF_T offset,
- size_t count)
-{
- char *spill_buffer = NULL;
- bool socket_drained = false;
- int ret;
- off_t total_rbytes = 0;
- off_t total_wbytes = 0;
- off_t rbytes;
- off_t wbytes;
-
- DEBUG(10,("onefs_recvfile: from = %d, to = %d, offset=%llu, count = "
- "%lu\n", fromfd, tofd, offset, count));
-
- if (count == 0) {
- return 0;
- }
-
- /*
- * Setup up a buffer for recvfile to spill data that has been read
- * from the socket but not written.
- */
- spill_buffer = get_spill_buffer(count);
- if (spill_buffer == NULL) {
- ret = -1;
- goto out;
- }
-
- /*
- * Keep trying recvfile until:
- * - There is no data left to read on the socket, or
- * - bytes read != bytes written, or
- * - An error is returned that isn't EINTR/EAGAIN
- */
- do {
- /* Keep track of bytes read/written for recvfile */
- rbytes = 0;
- wbytes = 0;
-
- DEBUG(10, ("calling recvfile loop, offset + total_wbytes = "
- "%llu, count - total_rbytes = %llu\n",
- offset + total_wbytes, count - total_rbytes));
-
- ret = recvfile(tofd, fromfd, offset + total_wbytes,
- count - total_wbytes, &rbytes, &wbytes, 0,
- spill_buffer);
-
- DEBUG(10, ("recvfile ret = %d, errno = %d, rbytes = %llu, "
- "wbytes = %llu\n", ret, ret >= 0 ? 0 : errno,
- rbytes, wbytes));
-
- /* Update our progress so far */
- total_rbytes += rbytes;
- total_wbytes += wbytes;
-
- } while ((count - total_rbytes) && (rbytes == wbytes) &&
- (ret == -1 && (errno == EINTR || errno == EAGAIN)));
-
- DEBUG(10, ("total_rbytes = %llu, total_wbytes = %llu\n",
- total_rbytes, total_wbytes));
-
- /* Log if recvfile didn't write everything it read. */
- if (total_rbytes != total_wbytes) {
- DEBUG(0, ("partial recvfile: total_rbytes=%llu but "
- "total_wbytes=%llu, diff = %llu\n", total_rbytes,
- total_wbytes, total_rbytes - total_wbytes));
- SMB_ASSERT(total_rbytes > total_wbytes);
- }
-
- /*
- * If there is still data on the socket, read it off.
- */
- while (total_rbytes < count) {
-
- DEBUG(0, ("shallow recvfile, reading %llu\n",
- count - total_rbytes));
-
- /*
- * Read the remaining data into the spill buffer. recvfile
- * may already have some data in the spill buffer, so start
- * filling the buffer at total_rbytes - total_wbytes.
- */
- ret = sys_read(fromfd,
- spill_buffer + (total_rbytes - total_wbytes),
- count - total_rbytes);
-
- if (ret == -1) {
- DEBUG(0, ("shallow recvfile read failed: %s\n",
- strerror(errno)));
- /* Socket is dead, so treat as if it were drained. */
- socket_drained = true;
- goto out;
- }
-
- /* Data was read so update the rbytes */
- total_rbytes += ret;
- }
-
- if (total_rbytes != count) {
- smb_panic("Unread recvfile data still on the socket!");
- }
-
- /*
- * Now write any spilled data + the extra data read off the socket.
- */
- while (total_wbytes < count) {
-
- DEBUG(0, ("partial recvfile, writing %llu\n", count - total_wbytes));
-
- ret = sys_pwrite(tofd, spill_buffer, count - total_wbytes,
- offset + total_wbytes);
-
- if (ret == -1) {
- DEBUG(0, ("partial recvfile write failed: %s\n",
- strerror(errno)));
- goto out;
- }
-
- /* Data was written so update the wbytes */
- total_wbytes += ret;
- }
-
- /* Success! */
- ret = total_wbytes;
-
-out:
- /* Make sure we always try to drain the socket. */
- if (!socket_drained && count - total_rbytes) {
- int saved_errno = errno;
-
- if (drain_socket(fromfd, count - total_rbytes) !=
- count - total_rbytes) {
- /* Socket is dead! */
- DEBUG(0, ("drain socket failed: %d\n", errno));
- }
- errno = saved_errno;
- }
-
- return ret;
-}
git.samba.org / samba.git / blobdiff