fs: implement flush function
Once we have caching in file functions we need a way to sync the the underlying devices. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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3efa8f7bed
commit
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11
fs/devfs.c
11
fs/devfs.c
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@ -169,6 +169,16 @@ static int devfs_close(struct device_d *_dev, FILE *f)
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return 0;
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}
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static int devfs_flush(struct device_d *_dev, FILE *f)
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{
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struct cdev *cdev = f->inode;
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if (cdev->ops->flush)
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return cdev->ops->flush(cdev);
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return 0;
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}
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static int partition_ioctl(struct cdev *cdev, int request, void *buf)
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{
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size_t offset;
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@ -287,6 +297,7 @@ static struct fs_driver_d devfs_driver = {
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.lseek = devfs_lseek,
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.open = devfs_open,
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.close = devfs_close,
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.flush = devfs_flush,
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.ioctl = devfs_ioctl,
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.opendir = devfs_opendir,
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.readdir = devfs_readdir,
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20
fs/fs.c
20
fs/fs.c
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@ -536,6 +536,26 @@ ssize_t write(int fd, const void *buf, size_t count)
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}
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EXPORT_SYMBOL(write);
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int flush(int fd)
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{
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struct device_d *dev;
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struct fs_driver_d *fsdrv;
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FILE *f = &files[fd];
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if (check_fd(fd))
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return errno;
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dev = f->dev;
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fsdrv = (struct fs_driver_d *)dev->driver->type_data;
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if (fsdrv->flush)
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errno = fsdrv->flush(dev, f);
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else
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errno = 0;
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return errno;
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}
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off_t lseek(int fildes, off_t offset, int whence)
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{
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struct device_d *dev;
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@ -292,6 +292,7 @@ struct file_operations {
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off_t (*lseek)(struct cdev*, off_t);
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int (*open)(struct cdev*);
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int (*close)(struct cdev*);
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int (*flush)(struct cdev*);
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int (*erase)(struct cdev*, size_t count, unsigned long offset);
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int (*protect)(struct cdev*, size_t count, unsigned long offset, int prot);
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int (*memmap)(struct cdev*, void **map, int flags);
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@ -53,6 +53,7 @@ struct fs_driver_d {
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int (*close)(struct device_d *dev, FILE *f);
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int (*read)(struct device_d *dev, FILE *f, void *buf, size_t size);
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int (*write)(struct device_d *dev, FILE *f, const void *buf, size_t size);
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int (*flush)(struct device_d *dev, FILE *f);
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off_t (*lseek)(struct device_d *dev, FILE *f, off_t pos);
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struct dir* (*opendir)(struct device_d *dev, const char *pathname);
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@ -98,6 +99,7 @@ int open(const char *pathname, int flags, ...);
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int creat(const char *pathname, mode_t mode);
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int unlink(const char *pathname);
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int close(int fd);
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int flush(int fd);
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int stat(const char *filename, struct stat *s);
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int read(int fd, void *buf, size_t count);
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int ioctl(int fd, int request, void *buf);
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