int open_blockdriver(FAR const char *pathname, int mountflags, FAR struct inode **ppinode)
{
FAR struct inode *inode;
int ret;
/* Minimal sanity checks */
#ifdef CONFIG_DEBUG
if (!ppinode)
{
ret = -EINVAL;
goto errout;
}
#endif
/* Find the inode associated with this block driver name. find_blockdriver
* will perform all additional error checking.
*/
ret = find_blockdriver(pathname, mountflags, &inode);
if (ret < 0)
{
fdbg("Failed to file %s block driver\n", pathname);
goto errout;
}
/* Open the block driver. Note that no mutually exclusive access
* to the driver is enforced here. That must be done in the driver
* if needed.
*/
if (inode->u.i_bops->open)
{
ret = inode->u.i_bops->open(inode);
if (ret < 0)
{
fdbg("%s driver open failed\n", pathname);
goto errout_with_inode;
}
}
*ppinode = inode;
return OK;
errout_with_inode:
inode_release(inode);
errout:
return ret;
}
int mount(const char *source, const char *target,
const char *filesystemtype, unsigned long mountflags,
const void *data)
{
#if defined(BDFS_SUPPORT) || defined(NONBDFS_SUPPORT)
#ifdef BDFS_SUPPORT
FAR struct inode *blkdrvr_inode = NULL;
#endif
FAR struct inode *mountpt_inode;
FAR const struct mountpt_operations *mops;
void *fshandle;
int errcode;
int status;
/* Verify required pointer arguments */
DEBUGASSERT(target && filesystemtype);
/* Find the specified filesystem. Try the block driver file systems first */
#ifdef BDFS_SUPPORT
if ((mops = mount_findfs(g_bdfsmap, filesystemtype)) != NULL)
{
/* Make sure that a block driver argument was provided */
DEBUGASSERT(source);
/* Find the block driver */
status = find_blockdriver(source, mountflags, &blkdrvr_inode);
if (status < 0)
{
fdbg("Failed to find block driver %s\n", source);
errcode = -status;
goto errout;
}
}
else
#endif /* BDFS_SUPPORT */
#ifdef NONBDFS_SUPPORT
if ((mops = mount_findfs(g_nonbdfsmap, filesystemtype)) != NULL)
{
}
else
#endif /* NONBDFS_SUPPORT */
{
fdbg("Failed to find file system %s\n", filesystemtype);
errcode = ENODEV;
goto errout;
}
/* Insert a dummy node -- we need to hold the inode semaphore
* to do this because we will have a momentarily bad structure.
*/
inode_semtake();
mountpt_inode = inode_reserve(target);
if (!mountpt_inode)
{
/* inode_reserve can fail for a couple of reasons, but the most likely
* one is that the inode already exists.
*/
fdbg("Failed to reserve inode\n");
errcode = EBUSY;
goto errout_with_semaphore;
}
/* Bind the block driver to an instance of the file system. The file
* system returns a reference to some opaque, fs-dependent structure
* that encapsulates this binding.
*/
if (!mops->bind)
{
/* The filesystem does not support the bind operation ??? */
fdbg("Filesystem does not support bind\n");
errcode = EINVAL;
goto errout_with_mountpt;
}
/* Increment reference count for the reference we pass to the file system */
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
blkdrvr_inode->i_crefs++;
}
#endif
/* On failure, the bind method returns -errorcode */
#ifdef BDFS_SUPPORT
status = mops->bind(blkdrvr_inode, data, &fshandle);
#else
status = mops->bind(NULL, data, &fshandle);
#endif
if (status != 0)
{
/* The inode is unhappy with the blkdrvr for some reason. Back out
* the count for the reference we failed to pass and exit with an
* error.
*/
fdbg("Bind method failed: %d\n", status);
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
blkdrvr_inode->i_crefs--;
}
#endif
errcode = -status;
goto errout_with_mountpt;
}
/* We have it, now populate it with driver specific information. */
INODE_SET_MOUNTPT(mountpt_inode);
mountpt_inode->u.i_mops = mops;
#ifdef CONFIG_FILE_MODE
mountpt_inode->i_mode = mode;
#endif
mountpt_inode->i_private = fshandle;
inode_semgive();
/* We can release our reference to the blkdrver_inode, if the filesystem
* wants to retain the blockdriver inode (which it should), then it must
* have called inode_addref(). There is one reference on mountpt_inode
* that will persist until umount() is called.
*/
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
inode_release(blkdrvr_inode);
}
#endif
return OK;
/* A lot of goto's! But they make the error handling much simpler */
errout_with_mountpt:
mountpt_inode->i_crefs = 0;
inode_remove(target);
inode_semgive();
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
inode_release(blkdrvr_inode);
}
#endif
inode_release(mountpt_inode);
goto errout;
errout_with_semaphore:
inode_semgive();
#ifdef BDFS_SUPPORT
#ifdef NONBDFS_SUPPORT
if (blkdrvr_inode)
#endif
{
inode_release(blkdrvr_inode);
}
#endif
errout:
errno = errcode;
return ERROR;
#else
fdbg("No filesystems enabled\n");
ernno = ENOSYS;
return error;
#endif /* BDFS_SUPPORT || NONBDFS_SUPPORT */
}