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fs: get fs driver using container_of 

This reduces the usage of dev->type_data.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2012-02-19 16:39:53 +01:00
parent 660a2864cb
commit 76c7f90a54
2 changed files with 18 additions and 17 deletions
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33
fs/fs.c
View File

@ -347,7 +347,7 @@ int unlink(const char *pathname)
dev = get_fs_device_by_path(&p);
if (!dev)
goto out;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (!fsdrv->unlink) {
errno = -ENOSYS;
@ -393,7 +393,7 @@ int open(const char *pathname, int flags, ...)
if (!dev)
goto out;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
f->dev = dev;
f->flags = flags;
@ -455,7 +455,7 @@ int ioctl(int fd, int request, void *buf)
dev = f->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (fsdrv->ioctl)
errno = fsdrv->ioctl(dev, f, request, buf);
@ -475,7 +475,7 @@ int read(int fd, void *buf, size_t count)
dev = f->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (f->pos + count > f->size)
count = f->size - f->pos;
@ -502,7 +502,7 @@ ssize_t write(int fd, const void *buf, size_t count)
dev = f->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (f->pos + count > f->size) {
errno = fsdrv->truncate(dev, f, f->pos + count);
if (errno) {
@ -534,7 +534,7 @@ int flush(int fd)
dev = f->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (fsdrv->flush)
errno = fsdrv->flush(dev, f);
else
@ -556,7 +556,7 @@ off_t lseek(int fildes, off_t offset, int whence)
errno = 0;
dev = f->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (!fsdrv->lseek) {
errno = -ENOSYS;
return -1;
@ -601,7 +601,7 @@ int erase(int fd, size_t count, unsigned long offset)
dev = f->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (f->pos + count > f->size)
count = f->size - f->pos;
@ -626,7 +626,7 @@ int protect(int fd, size_t count, unsigned long offset, int prot)
dev = f->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (f->pos + count > f->size)
count = f->size - f->pos;
@ -667,7 +667,7 @@ void *memmap(int fd, int flags)
dev = f->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (fsdrv->memmap)
errno = fsdrv->memmap(dev, f, &ret, flags);
@ -689,7 +689,7 @@ int close(int fd)
dev = f->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
errno = fsdrv->close(dev, f);
put_file(f);
@ -765,8 +765,7 @@ EXPORT_SYMBOL(register_fs_driver);
/*
* Mount a device to a directory.
* We do this by registering a new device on which the filesystem
* driver will match. The filesystem driver then grabs the infomation
* it needs from the new devices type_data.
* driver will match.
*/
int mount(const char *device, const char *fsname, const char *_path)
{
@ -880,7 +879,7 @@ DIR *opendir(const char *pathname)
dev = get_fs_device_by_path(&p);
if (!dev)
goto out;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
debug("opendir: fsdrv: %p\n",fsdrv);
@ -938,7 +937,7 @@ int stat(const char *filename, struct stat *s)
} else
dev = mtab_root->dev;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (*f == 0)
f = "/";
@ -963,7 +962,7 @@ int mkdir (const char *pathname, mode_t mode)
dev = get_fs_device_by_path(&p);
if (!dev)
goto out;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (fsdrv->mkdir) {
errno = fsdrv->mkdir(dev, p);
@ -990,7 +989,7 @@ int rmdir (const char *pathname)
dev = get_fs_device_by_path(&p);
if (!dev)
goto out;
fsdrv = (struct fs_driver_d *)dev->driver->type_data;
fsdrv = dev_to_fs_driver(dev);
if (fsdrv->rmdir) {
errno = fsdrv->rmdir(dev, p);

2
include/fs.h
View File

@ -74,6 +74,8 @@ struct fs_driver_d {
unsigned long flags;
};
#define dev_to_fs_driver(d) container_of(d->driver, struct fs_driver_d, drv)
struct mtab_entry {
char *path;
struct device_d *dev;