--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ Make use of gpfs prefetch functionality
+
+ Copyright (C) Volker Lendecke 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 "includes.h"
+#include "smbd/proto.h"
+#include "include/smbprofile.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+#include <gpfs.h>
+#include <gpfs_fcntl.h>
+
+static int (*gpfs_fcntl_fn)(int fd, void *arg);
+
+static int smbd_gpfs_fcntl(int fd, void *arg)
+{
+ static void *libgpfs_handle = NULL;
+
+ DEBUG(10, ("smbd_gpfs_fcntl called for %d\n", fd));
+
+ if (gpfs_fcntl_fn == NULL) {
+ libgpfs_handle = dlopen("libgpfs.so", RTLD_LAZY);
+
+ if (libgpfs_handle == NULL) {
+ DEBUG(10, ("sys_dlopen for libgpfs failed: %s\n",
+ strerror(errno)));
+ return -1;
+ }
+
+ gpfs_fcntl_fn = dlsym(libgpfs_handle, "gpfs_fcntl");
+ if (gpfs_fcntl_fn == NULL) {
+ DEBUG(3, ("libgpfs.so does not contain the symbol "
+ "'gpfs_fcntl'\n"));
+ errno = ENOSYS;
+ return -1;
+ }
+ }
+
+ return gpfs_fcntl_fn(fd, arg);
+}
+
+struct gpfs_prefetch_config {
+ name_compare_entry *namelist;
+ size_t size;
+};
+
+struct gpfs_prefetch_hints {
+ blksize_t st_blksize;
+ /*
+ * The current center around which config->size bytes are
+ * prefetched
+ */
+ SMB_OFF_T center;
+};
+
+static void gpfs_prefetch_recenter(vfs_handle_struct *handle,
+ files_struct *fsp,
+ SMB_OFF_T offset, size_t size,
+ struct gpfs_prefetch_hints *hints)
+{
+ int ret;
+ SMB_OFF_T new_center;
+
+ struct {
+ gpfsFcntlHeader_t hdr;
+ gpfsMultipleAccessRange_t acc;
+ } arg;
+
+
+ if (hints->st_blksize == 0) {
+ SMB_STRUCT_STAT sbuf;
+
+ if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
+ return;
+ }
+ DEBUG(10, ("gpfs_prefetch_recenter: st_blksize = %d\n",
+ (int)sbuf.st_ex_blksize));
+ hints->st_blksize = sbuf.st_ex_blksize;
+ }
+
+ new_center = (offset > size) ? offset : 0;
+
+ DEBUG(10, ("gpfs_prefetch_recenter: size=%d, offset=%d, "
+ "old_center=%d, new_center=%d\n", (int)size, (int)offset,
+ (int)hints->center, (int)new_center));
+
+ ZERO_STRUCT(arg);
+
+ arg.hdr.totalLength = sizeof(arg);
+ arg.hdr.fcntlVersion = GPFS_FCNTL_CURRENT_VERSION;
+ arg.hdr.fcntlReserved = 0;
+ arg.acc.structLen = sizeof(arg.acc);
+ arg.acc.structType = GPFS_MULTIPLE_ACCESS_RANGE;
+ arg.acc.accRangeCnt = 1;
+ arg.acc.relRangeCnt = 1;
+
+ arg.acc.accRangeArray[0].blockNumber = new_center/hints->st_blksize;
+ arg.acc.accRangeArray[0].start = 0;
+ arg.acc.accRangeArray[0].length = size;
+ arg.acc.accRangeArray[0].isWrite = 0;
+
+ arg.acc.relRangeArray[0].blockNumber = hints->center/hints->st_blksize;
+ arg.acc.relRangeArray[0].start = 0;
+ arg.acc.relRangeArray[0].length = size;
+ arg.acc.relRangeArray[0].isWrite = 0;
+
+ ret = smbd_gpfs_fcntl(fsp->fh->fd, &arg);
+ if (ret == -1) {
+ DEBUG(5, ("gpfs_fcntl returned %s\n", strerror(errno)));
+ }
+
+ hints->center = new_center;
+}
+
+static ssize_t gpfs_prefetch_pread(vfs_handle_struct *handle,
+ files_struct *fsp, void *data,
+ size_t n, SMB_OFF_T offset)
+{
+ struct gpfs_prefetch_config *config =
+ (struct gpfs_prefetch_config *)handle->data;
+ struct gpfs_prefetch_hints *hints = (struct gpfs_prefetch_hints *)
+ VFS_FETCH_FSP_EXTENSION(handle, fsp);
+ SMB_OFF_T out_of_center;
+
+ /*
+ * How far away from the center of the prefetch region is the
+ * request?
+ */
+
+ out_of_center = (offset > hints->center)
+ ? (offset - hints->center) : (hints->center - offset);
+
+ DEBUG(10, ("gpfs_prefetch_pread: n=%d, offset=%d, center=%d, "
+ "out_of_center=%d, size=%d\n", (int)n, (int)offset,
+ (int)hints->center, (int)out_of_center,
+ (int)config->size));
+ /*
+ * Are we completely out of the prefetch range or less than
+ * 10% at its borders?
+ */
+
+ if ((out_of_center > config->size)
+ || ((config->size - out_of_center) * 10 < config->size)) {
+ /*
+ * Re-center the prefetch area
+ */
+ gpfs_prefetch_recenter(handle, fsp, offset, config->size,
+ hints);
+ }
+
+ return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
+}
+
+static int gpfs_prefetch_open(struct vfs_handle_struct *handle,
+ struct smb_filename *smb_fname,
+ files_struct *fsp,
+ int flags, mode_t mode)
+{
+ int fd, ret;
+ struct gpfs_prefetch_hints *hints;
+ struct gpfs_prefetch_config *config =
+ (struct gpfs_prefetch_config *)handle->data;
+
+ struct {
+ gpfsFcntlHeader_t hdr;
+ gpfsAccessRange_t acc;
+ } arg;
+
+ DEBUG(10, ("gpfs_prefetch_open called for %s, config=%p, "
+ "config->namelist = %p, config->size=%d\n",
+ smb_fname->base_name,
+ config, config->namelist, (int)config->size));
+
+ if (!is_in_path(smb_fname->base_name, config->namelist,
+ handle->conn->case_sensitive)) {
+ DEBUG(10, ("gpfs_prefetch_open not in list: %s\n",
+ smb_fname->base_name));
+ return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags,
+ mode);
+ }
+
+ hints = (struct gpfs_prefetch_hints *)VFS_ADD_FSP_EXTENSION(
+ handle, fsp, struct gpfs_prefetch_hints, NULL);
+ if (hints == NULL) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ fd = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
+ if (fd == -1) {
+ VFS_REMOVE_FSP_EXTENSION(handle, fsp);
+ return -1;
+ }
+
+ arg.hdr.totalLength = sizeof(arg);
+ arg.hdr.fcntlVersion = GPFS_FCNTL_CURRENT_VERSION;
+ arg.hdr.fcntlReserved = 0;
+ arg.acc.structLen = sizeof(arg.acc);
+ arg.acc.structType = GPFS_ACCESS_RANGE;
+ arg.acc.start = 0;
+ arg.acc.length = 1;
+ arg.acc.isWrite = 0;
+
+ ret = smbd_gpfs_fcntl(fd, &arg);
+ if (ret == -1) {
+ DEBUG(5, ("gpfs_fcntl returned %s\n", strerror(errno)));
+ }
+
+ hints->st_blksize = 0;
+ hints->center = 0;
+
+ return fd;
+}
+
+static void gpfs_prefetch_config_free(void **data)
+{
+ struct gpfs_prefetch_config **config =
+ (struct gpfs_prefetch_config **)data;
+
+ free_namearray((*config)->namelist);
+ TALLOC_FREE(*config);
+}
+
+static int gpfs_prefetch_connect(struct vfs_handle_struct *handle,
+ const char *service,
+ const char *user)
+{
+ struct gpfs_prefetch_config *config;
+ const char *mask;
+
+ config = talloc(handle, struct gpfs_prefetch_config);
+ if (config == NULL) {
+ DEBUG(0, ("talloc failed\n"));
+ errno = ENOMEM;
+ return -1;
+ }
+
+ mask = lp_parm_const_string(SNUM(handle->conn), "gpfs_prefetch",
+ "mask", "");
+
+ set_namearray(&config->namelist, mask);
+ config->size = lp_parm_int(SNUM(handle->conn), "gpfs_prefetch",
+ "size", 1024);
+
+ /*
+ * The size calculations in the core routines assume that
+ * config->size is the size from the center to the border of
+ * the prefetched area. So we need to multiply by 1024/2 here
+ * to get the whole prefetch area in kilobytes.
+ */
+ config->size *= 1024/2;
+
+ SMB_VFS_HANDLE_SET_DATA(handle, config, gpfs_prefetch_config_free,
+ struct gpfs_prefetch_config, goto fail);
+
+ return SMB_VFS_NEXT_CONNECT(handle, service, user);
+
+fail:
+ free_namearray(config->namelist);
+ TALLOC_FREE(config);
+ return -1;
+}
+
+/* VFS operations structure */
+
+static struct vfs_fn_pointers gpfs_prefetch_fns = {
+ .open_fn = gpfs_prefetch_open,
+ .pread = gpfs_prefetch_pread,
+ .connect_fn = gpfs_prefetch_connect,
+};
+
+/*
+ * When done properly upstream (GPL issue resolved), change this
+ * routine name to vfs_gpfs_prefetch_init!!
+ */
+
+NTSTATUS init_samba_module(void);
+NTSTATUS init_samba_module(void)
+{
+ NTSTATUS status;
+
+ DEBUG(10, ("vfs_gpfs_prefetch_init called\n"));
+
+ status = smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "gpfs_prefetch",
+ &gpfs_prefetch_fns);
+ DEBUG(10, ("smb_register_vfs returned %s\n",
+ nt_errstr(status)));
+
+ return status;
+}
git.samba.org / obnox / samba-ctdb.git / commitdiff