Add low water mark for queuing depth
[fio.git] / filesetup.c
index 4fa04ecd6310adcc88c69c53be3f88759557915b..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)
@@ -103,9 +103,19 @@ static int create_files(struct thread_data *td)
                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;
@@ -117,14 +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;
@@ -139,6 +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);
@@ -149,9 +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;
 }
 
@@ -315,29 +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) {
@@ -362,6 +398,16 @@ int open_files(struct thread_data *td)
                        break;
        }
 
+       if (!err)
+               return 0;
+
+       for_each_file(td, f, i) {
+               if (f->fd != -1) {
+                       close(f->fd);
+                       f->fd = -1;
+               }
+       }
+
        return err;
 }
 
@@ -424,7 +470,8 @@ void close_files(struct thread_data *td)
        int i;
 
        for_each_file(td, f, i) {
-               if (td->unlink && td->filetype == FIO_TYPE_FILE) {
+               if (!td->filename && f->unlink &&
+                   td->filetype == FIO_TYPE_FILE) {
                        unlink(f->file_name);
                        free(f->file_name);
                        f->file_name = NULL;