[PATCH] syslet engine: use pread instead lseek+read
[fio.git] / filesetup.c
index 327eb5ac8cf4dcab676f888cc9b2c663d791166d..84cd7f7dfe2bffa93ed62d3ea7aaa790cd6e02b3 100644 (file)
@@ -8,25 +8,31 @@
 #include "fio.h"
 #include "os.h"
 
+/*
+ * Check if the file exists and it's large enough.
+ */
+static int file_ok(struct thread_data *td, struct fio_file *f)
+{
+       struct stat st;
+
+       if (td->filetype != FIO_TYPE_FILE || (td->io_ops->flags & FIO_NULLIO))
+               return 0;
+
+       if (stat(f->file_name, &st) == -1)
+               return 1;
+       else if (st.st_size < (off_t) f->file_size)
+               return 1;
+
+       return 0;
+}
+
 static int create_file(struct thread_data *td, struct fio_file *f)
 {
        unsigned long long left;
        unsigned int bs;
-       struct stat st;
        char *b;
        int r;
 
-       if (td->filetype != FIO_TYPE_FILE)
-               return 0;
-
-       if (stat(f->file_name, &st) == -1) {
-               if (!td->create_file) {
-                       td_verror(td, ENOENT);
-                       return 1;
-               }
-       } else if (st.st_size >= (off_t) f->file_size)
-               return 0;
-
        f->fd = open(f->file_name, O_WRONLY | O_CREAT | O_TRUNC, 0644);
        if (f->fd < 0) {
                td_verror(td, errno);
@@ -38,12 +44,17 @@ static int create_file(struct thread_data *td, struct fio_file *f)
                goto err;
        }
 
-       b = malloc(td->max_bs);
-       memset(b, 0, td->max_bs);
+       if (posix_fallocate(f->fd, 0, f->file_size) < 0) {
+               td_verror(td, errno);
+               goto err;
+       }
+
+       b = malloc(td->max_bs[DDIR_WRITE]);
+       memset(b, 0, td->max_bs[DDIR_WRITE]);
 
        left = f->file_size;
        while (left && !td->terminate) {
-               bs = td->max_bs;
+               bs = td->max_bs[DDIR_WRITE];
                if (bs > left)
                        bs = left;
 
@@ -80,18 +91,35 @@ err:
 static int create_files(struct thread_data *td)
 {
        struct fio_file *f;
-       int i, err;
+       int i, err, need_create;
+
+       for_each_file(td, f, i)
+               f->file_size = td->total_file_size / td->nr_files;
 
        /*
         * unless specifically asked for overwrite, let normal io extend it
         */
-       if (!td->overwrite) {
-               for_each_file(td, f, i)
-                       f->file_size = td->total_file_size / td->nr_files;
-
+       if (!td->overwrite)
                return 0;
+
+       need_create = 0;
+       if (td->filetype == FIO_TYPE_FILE) {
+               for_each_file(td, f, i) {
+                       int file_there = !file_ok(td, f);
+
+                       if (file_there && td->ddir == DDIR_WRITE &&
+                           !td->overwrite) {
+                               unlink(f->file_name);
+                               file_there = 0;
+                       }
+
+                       need_create += !file_there;
+               }
        }
 
+       if (!need_create)
+               return 0;
+
        if (!td->total_file_size) {
                log_err("Need size for create\n");
                td_verror(td, EINVAL);
@@ -99,18 +127,25 @@ static int create_files(struct thread_data *td)
        }
 
        temp_stall_ts = 1;
-       fprintf(f_out, "%s: Laying out IO file(s) (%LuMiB)\n",
-                                       td->name, td->total_file_size >> 20);
+       fprintf(f_out, "%s: Laying out IO file(s) (%u x %LuMiB == %LuMiB)\n",
+                               td->name, td->nr_uniq_files,
+                               (td->total_file_size >> 20) / td->nr_uniq_files,
+                               td->total_file_size >> 20);
 
        err = 0;
        for_each_file(td, f, i) {
-               f->file_size = td->total_file_size / td->nr_files;
-               err = create_file(td, f);
-               if (err)
-                       break;
+               /*
+                * Only unlink files that we created.
+                */
+               f->unlink = 0;
+               if (file_ok(td, f)) {
+                       f->unlink = td->unlink;
+                       err = create_file(td, f);
+                       if (err)
+                               break;
+               }
        }
 
-       td->io_size = td->total_file_size;
        temp_stall_ts = 0;
        return err;
 }
@@ -119,6 +154,16 @@ static int file_size(struct thread_data *td, struct fio_file *f)
 {
        struct stat st;
 
+       /*
+        * if we are not doing real io, just pretend the file is as large
+        * as the size= given. this works fine with nrfiles > 1 as well,
+        * we only really care about it being at least as big as size=
+        */
+       if (td->io_ops->flags & FIO_NULLIO) {
+               f->real_file_size = f->file_size = td->total_file_size;
+               return 0;
+       }
+
        if (td->overwrite) {
                if (fstat(f->fd, &st) == -1) {
                        td_verror(td, errno);
@@ -129,9 +174,9 @@ static int file_size(struct thread_data *td, struct fio_file *f)
 
                if (!f->file_size || f->file_size > f->real_file_size)
                        f->file_size = f->real_file_size;
-       }
+       } else
+               f->real_file_size = f->file_size;
 
-       f->file_size -= f->file_offset;
        return 0;
 }
 
@@ -295,29 +340,40 @@ static int setup_file(struct thread_data *td, struct fio_file *f)
 {
        int flags = 0;
 
-       if (td->odirect)
-               flags |= OS_O_DIRECT;
-
-       if (td_write(td) || td_rw(td)) {
-               if (td->filetype == FIO_TYPE_FILE) {
-                       if (!td->overwrite)
-                               flags |= O_TRUNC;
+       if (td->io_ops->flags & FIO_NETIO)
+               return 0;
 
-                       flags |= O_CREAT;
-               }
+       /*
+        * we need a valid file descriptor, but don't create a real file.
+        * lets just dup stdout, seems like a sensible approach.
+        */
+       if (td->io_ops->flags & FIO_NULLIO)
+               f->fd = dup(STDOUT_FILENO);
+       else {
+               if (td->odirect)
+                       flags |= OS_O_DIRECT;
                if (td->sync_io)
                        flags |= O_SYNC;
 
-               flags |= O_RDWR;
-
-               f->fd = open(f->file_name, flags, 0600);
-       } else {
-               if (td->filetype == FIO_TYPE_CHAR)
+               if (td_write(td) || td_rw(td)) {
                        flags |= O_RDWR;
-               else
-                       flags |= O_RDONLY;
 
-               f->fd = open(f->file_name, flags);
+                       if (td->filetype == FIO_TYPE_FILE) {
+                               if (!td->overwrite)
+                                       flags |= O_TRUNC;
+
+                               flags |= O_CREAT;
+                       }
+
+                       f->fd = open(f->file_name, flags, 0600);
+               } else {
+                       if (td->filetype == FIO_TYPE_CHAR)
+                               flags |= O_RDWR;
+                       else
+                               flags |= O_RDONLY;
+
+                       f->fd = open(f->file_name, flags);
+               }
        }
 
        if (f->fd == -1) {
@@ -331,10 +387,34 @@ static int setup_file(struct thread_data *td, struct fio_file *f)
        return 0;
 }
 
+int open_files(struct thread_data *td)
+{
+       struct fio_file *f;
+       int i, err = 0;
+
+       for_each_file(td, f, i) {
+               err = setup_file(td, f);
+               if (err)
+                       break;
+       }
+
+       if (!err)
+               return 0;
+
+       for_each_file(td, f, i) {
+               if (f->fd != -1) {
+                       close(f->fd);
+                       f->fd = -1;
+               }
+       }
+
+       return err;
+}
+
 int setup_files(struct thread_data *td)
 {
        struct fio_file *f;
-       int i, err;
+       int err, i;
 
        /*
         * if ioengine defines a setup() method, it's responsible for
@@ -346,12 +426,18 @@ int setup_files(struct thread_data *td)
        if (create_files(td))
                return 1;
 
-       for_each_file(td, f, i) {
-               err = setup_file(td, f);
-               if (err)
-                       break;
-       }
+       err = open_files(td);
+       if (err)
+               return err;
+
+       /*
+        * Recalculate the total file size now that files are set up.
+        */
+       td->total_file_size = 0;
+       for_each_file(td, f, i)
+               td->total_file_size += f->file_size;
 
+       td->io_size = td->total_file_size;
        if (td->io_size == 0) {
                log_err("%s: no io blocks\n", td->name);
                td_verror(td, EINVAL);
@@ -364,9 +450,18 @@ int setup_files(struct thread_data *td)
        td->total_io_size = td->io_size * td->loops;
 
        if (td->io_ops->flags & FIO_MMAPIO)
-               return setup_files_mmap(td);
+               err = setup_files_mmap(td);
        else
-               return setup_files_plain(td);
+               err = setup_files_plain(td);
+
+       for_each_file(td, f, i) {
+               if (f->fd != -1) {
+                       close(f->fd);
+                       f->fd = -1;
+               }
+       }
+
+       return err;
 }
 
 void close_files(struct thread_data *td)
@@ -375,9 +470,13 @@ void close_files(struct thread_data *td)
        int i;
 
        for_each_file(td, f, i) {
+               if (!td->filename && f->unlink &&
+                   td->filetype == FIO_TYPE_FILE) {
+                       unlink(f->file_name);
+                       free(f->file_name);
+                       f->file_name = NULL;
+               }
                if (f->fd != -1) {
-                       if (td->unlink && td->filetype == FIO_TYPE_FILE)
-                               unlink(f->file_name);
                        close(f->fd);
                        f->fd = -1;
                }
@@ -386,4 +485,9 @@ void close_files(struct thread_data *td)
                        f->mmap = NULL;
                }
        }
+
+       td->filename = NULL;
+       free(td->files);
+       td->files = NULL;
+       td->nr_files = 0;
 }