[PATCH] syslet engine: use pread instead lseek+read
[fio.git] / filesetup.c
index a1633827fe8eca63017bb8a2d91b731dd9854b73..84cd7f7dfe2bffa93ed62d3ea7aaa790cd6e02b3 100644 (file)
@@ -15,7 +15,7 @@ static int file_ok(struct thread_data *td, struct fio_file *f)
 {
        struct stat st;
 
-       if (td->filetype != FIO_TYPE_FILE)
+       if (td->filetype != FIO_TYPE_FILE || (td->io_ops->flags & FIO_NULLIO))
                return 0;
 
        if (stat(f->file_name, &st) == -1)
@@ -93,20 +93,29 @@ static int create_files(struct thread_data *td)
        struct fio_file *f;
        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)
-                       need_create += file_ok(td, f);
+       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;
@@ -118,14 +127,19 @@ static int create_files(struct thread_data *td)
        }
 
        temp_stall_ts = 1;
-       fprintf(f_out, "%s: Laying out IO file(s) (%d x %LuMiB == %LuMiB)\n",
+       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) {
+               /*
+                * 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;
@@ -140,6 +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);
@@ -150,9 +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;
 }
 
@@ -316,29 +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) {
@@ -352,10 +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
@@ -367,13 +426,7 @@ int setup_files(struct thread_data *td)
        if (create_files(td))
                return 1;
 
-       err = 0;
-       for_each_file(td, f, i) {
-               err = setup_file(td, f);
-               if (err)
-                       break;
-       }
-
+       err = open_files(td);
        if (err)
                return err;
 
@@ -397,9 +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)
@@ -408,14 +470,13 @@ void close_files(struct thread_data *td)
        int i;
 
        for_each_file(td, f, i) {
-               if (f->fd != -1) {
-                       if (td->unlink && td->filetype == FIO_TYPE_FILE &&
-                           td->filename) {
-                               unlink(f->file_name);
-                               td->filename = NULL;
-                       }
+               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) {
                        close(f->fd);
                        f->fd = -1;
                }
@@ -425,6 +486,7 @@ void close_files(struct thread_data *td)
                }
        }
 
+       td->filename = NULL;
        free(td->files);
        td->files = NULL;
        td->nr_files = 0;