Document loading external io engines

[fio.git] / filesetup.c

diff --git a/filesetup.c b/filesetup.c
index 1f1259d1ac156bd99666b73e8a6a71ecdd4d28ee..d8135ef08342ce05b0201fdf2fb8e8a8760afc3c 100644 (file)
--- a/filesetup.c
+++ b/filesetup.c
@@ -18,9 +18,15 @@ static int file_ok(struct thread_data *td, struct fio_file *f)
        if (td->filetype != FIO_TYPE_FILE || (td->io_ops->flags & FIO_NULLIO))
                return 0;
 
-       if (stat(f->file_name, &st) == -1)
+       if (lstat(f->file_name, &st) == -1)
                return 1;
-       else if (st.st_size < (off_t) f->file_size)
+
+       /*
+        * if it's a special file, size is always ok for now
+        */
+       if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))
+               return 0;
+       if (st.st_size < (off_t) f->file_size)
                return 1;
 
        return 0;
@@ -35,17 +41,17 @@ static int create_file(struct thread_data *td, struct fio_file *f)
 
        f->fd = open(f->file_name, O_WRONLY | O_CREAT | O_TRUNC, 0644);
        if (f->fd < 0) {
-               td_verror(td, errno);
+               td_verror(td, errno, "open");
                return 1;
        }
 
        if (ftruncate(f->fd, f->file_size) == -1) {
-               td_verror(td, errno);
+               td_verror(td, errno, "ftruncate");
                goto err;
        }
 
        if (posix_fallocate(f->fd, 0, f->file_size) < 0) {
-               td_verror(td, errno);
+               td_verror(td, errno, "posix_fallocate");
                goto err;
        }
 
@@ -65,9 +71,9 @@ static int create_file(struct thread_data *td, struct fio_file *f)
                        continue;
                } else {
                        if (r < 0)
-                               td_verror(td, errno);
+                               td_verror(td, errno, "write");
                        else
-                               td_verror(td, EIO);
+                               td_verror(td, EIO, "write");
 
                        break;
                }
@@ -107,8 +113,7 @@ static int create_files(struct thread_data *td)
                for_each_file(td, f, i) {
                        int file_there = !file_ok(td, f);
 
-                       if (file_there && td->ddir == DDIR_WRITE &&
-                           !td->overwrite) {
+                       if (file_there && td_write(td) && !td->overwrite) {
                                unlink(f->file_name);
                                file_there = 0;
                        }
@@ -122,7 +127,7 @@ static int create_files(struct thread_data *td)
 
        if (!td->total_file_size) {
                log_err("Need size for create\n");
-               td_verror(td, EINVAL);
+               td_verror(td, EINVAL, "file_size");
                return 1;
        }
 
@@ -154,9 +159,19 @@ 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);
+                       td_verror(td, errno, "fstat");
                        return 1;
                }
 
@@ -177,7 +192,7 @@ static int bdev_size(struct thread_data *td, struct fio_file *f)
 
        r = blockdev_size(f->fd, &bytes);
        if (r) {
-               td_verror(td, r);
+               td_verror(td, r, "blockdev_size");
                return 1;
        }
 
@@ -224,19 +239,21 @@ int file_invalidate_cache(struct thread_data *td, struct fio_file *f)
         */
        if (td->io_ops->flags & FIO_MMAPIO)
                ret = madvise(f->mmap, f->file_size, MADV_DONTNEED);
-       else if (td->filetype == FIO_TYPE_FILE)
-               ret = fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_DONTNEED);
-       else if (td->filetype == FIO_TYPE_BD)
-               ret = blockdev_invalidate_cache(f->fd);
-       else if (td->filetype == FIO_TYPE_CHAR)
+       else if (td->filetype == FIO_TYPE_FILE) {
+               if (!td->odirect)
+                       ret = fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_DONTNEED);
+       } else if (td->filetype == FIO_TYPE_BD) {
+               if (!td->odirect)
+                       ret = blockdev_invalidate_cache(f->fd);
+       } else if (td->filetype == FIO_TYPE_CHAR)
                ret = 0;
 
        if (ret < 0) {
-               td_verror(td, errno);
+               td_verror(td, errno, "invalidate_cache");
                return 1;
        }
 
-       return 0;
+       return ret;
 }
 
 static int __setup_file_mmap(struct thread_data *td, struct fio_file *f)
@@ -256,21 +273,21 @@ static int __setup_file_mmap(struct thread_data *td, struct fio_file *f)
        f->mmap = mmap(NULL, f->file_size, flags, MAP_SHARED, f->fd, f->file_offset);
        if (f->mmap == MAP_FAILED) {
                f->mmap = NULL;
-               td_verror(td, errno);
+               td_verror(td, errno, "mmap");
                return 1;
        }
 
        if (td->invalidate_cache && file_invalidate_cache(td, f))
                return 1;
 
-       if (td->sequential) {
+       if (!td_random(td)) {
                if (madvise(f->mmap, f->file_size, MADV_SEQUENTIAL) < 0) {
-                       td_verror(td, errno);
+                       td_verror(td, errno, "madvise");
                        return 1;
                }
        } else {
                if (madvise(f->mmap, f->file_size, MADV_RANDOM) < 0) {
-                       td_verror(td, errno);
+                       td_verror(td, errno, "madvise");
                        return 1;
                }
        }
@@ -297,14 +314,14 @@ static int __setup_file_plain(struct thread_data *td, struct fio_file *f)
        if (td->invalidate_cache && file_invalidate_cache(td, f))
                return 1;
 
-       if (td->sequential) {
+       if (!td_random(td)) {
                if (fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_SEQUENTIAL) < 0) {
-                       td_verror(td, errno);
+                       td_verror(td, errno, "fadvise");
                        return 1;
                }
        } else {
                if (fadvise(f->fd, f->file_offset, f->file_size, POSIX_FADV_RANDOM) < 0) {
-                       td_verror(td, errno);
+                       td_verror(td, errno, "fadvise");
                        return 1;
                }
        }
@@ -367,7 +384,11 @@ static int setup_file(struct thread_data *td, struct fio_file *f)
        }
 
        if (f->fd == -1) {
-               td_verror(td, errno);
+               int __e = errno;
+
+               td_verror(td, __e, "open");
+               if (__e == EINVAL && td->odirect)
+                       log_err("fio: destination does not support O_DIRECT\n");
                return 1;
        }
 
@@ -430,7 +451,7 @@ int setup_files(struct thread_data *td)
        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);
+               td_verror(td, EINVAL, "total_file_size");
                return 1;
        }