Once we have caching in file functions we need a way to sync
the the underlying devices.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
fs/devfs.c | 11 +++++++++++
fs/fs.c | 20 ++++++++++++++++++++
include/driver.h | 1 +
include/fs.h | 2 ++
4 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/fs/devfs.c b/fs/devfs.c
index ddb3447..f82fddd 100644
--- a/fs/devfs.c
+++ b/fs/devfs.c
@@ -169,6 +169,16 @@ static int devfs_close(struct device_d *_dev, FILE *f)
return 0;
}
+static int devfs_flush(struct device_d *_dev, FILE *f)
+{
+ struct cdev *cdev = f->inode;
+
+ if (cdev->ops->flush)
+ return cdev->ops->flush(cdev);
+
+ return 0;
+}
+
static int partition_ioctl(struct cdev *cdev, int request, void *buf)
{
size_t offset;
@@ -287,6 +297,7 @@ static struct fs_driver_d devfs_driver = {
.lseek = devfs_lseek,
.open = devfs_open,
.close = devfs_close,
+ .flush = devfs_flush,
.ioctl = devfs_ioctl,
.opendir = devfs_opendir,
.readdir = devfs_readdir,
diff --git a/fs/fs.c b/fs/fs.c
index f684d45..059f67a 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -536,6 +536,26 @@ ssize_t write(int fd, const void *buf, size_t count)
}
EXPORT_SYMBOL(write);
+int flush(int fd)
+{
+ struct device_d *dev;
+ struct fs_driver_d *fsdrv;
+ FILE *f = &files[fd];
+
+ if (check_fd(fd))
+ return errno;
+
+ dev = f->dev;
+
+ fsdrv = (struct fs_driver_d *)dev->driver->type_data;
+ if (fsdrv->flush)
+ errno = fsdrv->flush(dev, f);
+ else
+ errno = 0;
+
+ return errno;
+}
+
off_t lseek(int fildes, off_t offset, int whence)
{
struct device_d *dev;
diff --git a/include/driver.h b/include/driver.h
index bd00069..14ccc6d 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -292,6 +292,7 @@ struct file_operations {
off_t (*lseek)(struct cdev*, off_t);
int (*open)(struct cdev*);
int (*close)(struct cdev*);
+ int (*flush)(struct cdev*);
int (*erase)(struct cdev*, size_t count, unsigned long offset);
int (*protect)(struct cdev*, size_t count, unsigned long offset, int prot);
int (*memmap)(struct cdev*, void **map, int flags);
diff --git a/include/fs.h b/include/fs.h
index 3834fe4..97d5995 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -53,6 +53,7 @@ struct fs_driver_d {
int (*close)(struct device_d *dev, FILE *f);
int (*read)(struct device_d *dev, FILE *f, void *buf, size_t size);
int (*write)(struct device_d *dev, FILE *f, const void *buf, size_t size);
+ int (*flush)(struct device_d *dev, FILE *f);
off_t (*lseek)(struct device_d *dev, FILE *f, off_t pos);
struct dir* (*opendir)(struct device_d *dev, const char *pathname);
@@ -98,6 +99,7 @@ int open(const char *pathname, int flags, ...);
int creat(const char *pathname, mode_t mode);
int unlink(const char *pathname);
int close(int fd);
+int flush(int fd);
int stat(const char *filename, struct stat *s);
int read(int fd, void *buf, size_t count);
int ioctl(int fd, int request, void *buf);
--
1.7.2.3
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