vmap – map an array of pages into virtually contiguous space Synopsis void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot); Arguments pages array of page pointers count number of pages to map flags vm_area->flags prot page protection for the mapping Description Maps count pages from pages into contiguous kernel virtual space….
vmalloc_user – allocate zeroed virtually contiguous memory for userspace Synopsis void *vmalloc_user(unsigned long size); Arguments size allocation size Description The resulting memory area is zeroed so it can be mapped to userspace without leaking data. Copyright
vmalloc_node – allocate memory on a specific node Synopsis void *vmalloc_node(unsigned long size, int node); Arguments size allocation size node numa node Description Allocate enough pages to cover size from the page level allocator and map them into contiguous kernel virtual space. For tight control over page level allocator and protection flags use __vmalloc instead….
vmalloc_32_user – allocate zeroed virtually contiguous 32bit memory Synopsis void *vmalloc_32_user(unsigned long size); Arguments size allocation size Description The resulting memory area is 32bit addressable and zeroed so it can be mapped to userspace without leaking data. Copyright
vmalloc_32 – allocate virtually contiguous memory (32bit addressable) Synopsis void *vmalloc_32(unsigned long size); Arguments size allocation size Description Allocate enough 32bit PA addressable pages to cover size from the page level allocator and map them into contiguous kernel virtual space. Copyright
vmalloc – allocate virtually contiguous memory Synopsis void *vmalloc(unsigned long size); Arguments size allocation size Allocate enough pages to cover size from the page level allocator and map them into contiguous kernel virtual space. Description For tight control over page level allocator and protection flags use __vmalloc instead. Copyright
vm_unmap_ram – unmap linear kernel address space set up by vm_map_ram Synopsis void vm_unmap_ram(const void *mem, unsigned int count); Arguments mem the pointer returned by vm_map_ram count the count passed to that vm_map_ram call (cannot unmap partial) Copyright
vm_unmap_aliases – unmap outstanding lazy aliases in the vmap layer Synopsis void vm_unmap_aliases(void); Arguments void no arguments Description The vmap/vmalloc layer lazily flushes kernel virtual mappings primarily to amortize TLB flushing overheads. What this means is that any page you have now, may, in a former life, have been mapped into kernel virtual address by…
vm_map_ram – map pages linearly into kernel virtual address (vmalloc space) Synopsis void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot); Arguments pages an array of pointers to the pages to be mapped count number of pages node prefer to allocate data structures on this node prot memory protection to use. PAGE_KERNEL for…
vm_iomap_memory – remap memory to userspace Synopsis int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); Arguments vma user vma to map to start start of area len size of area Description This is a simplified io_remap_pfn_range for common driver use. The driver just needs to give us the physical memory range to be mapped,…
vm_insert_pfn_prot – insert single pfn into user vma with specified pgprot Synopsis int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn, pgprot_t pgprot); Arguments vma user vma to map to addr target user address of this page pfn source kernel pfn pgprot pgprot flags for the inserted page Description This is exactly like vm_insert_pfn,…
vm_insert_pfn – insert single pfn into user vma Synopsis int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn); Arguments vma user vma to map to addr target user address of this page pfn source kernel pfn Description Similar to vm_insert_page, this allows drivers to insert individual pages they’ve allocated into a user vma. Same…
vm_insert_page – insert single page into user vma Synopsis int vm_insert_page(struct vm_area_struct *vma, unsigned long addr, struct page *page); Arguments vma user vma to map to addr target user address of this page page source kernel page Description This allows drivers to insert individual pages they’ve allocated into a user vma. The page has to…
virt_to_phys – map virtual addresses to physical Synopsis phys_addr_t virt_to_phys(volatile void * address); Arguments address address to remap Description The returned physical address is the physical (CPU) mapping for the memory address given. It is only valid to use this function on addresses directly mapped or allocated via kmalloc. This function does not give bus mappings for…
vfs_unlink – unlink a filesystem object Synopsis int vfs_unlink(struct inode *dir, struct dentry *dentry, struct inode **delegated_inode); Arguments dir parent directory dentry victim delegated_inode returns victim inode, if the inode is delegated. Description The caller must hold dir->i_mutex. If vfs_unlink discovers a delegation, it will return -EWOULDBLOCK and return a reference to the inode in…
vfs_test_lock – test file byte range lock Synopsis int vfs_test_lock(struct file *filp, struct file_lock *fl); Arguments filp The file to test lock for fl The lock to test; also used to hold result Description Returns -ERRNO on failure. Indicates presence of conflicting lock by setting conf->fl_type to something other than F_UNLCK. Copyright
vfs_setlease – sets a lease on an open file Synopsis int vfs_setlease(struct file *filp, long arg, struct file_lock **lease, void **priv); Arguments filp file pointer arg type of lease to obtain lease file_lock to use when adding a lease priv private info for lm_setup when adding a lease (may be NULL if lm_setup doesn’t require…
vfs_rename – rename a filesystem object Synopsis int vfs_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry, struct inode **delegated_inode, unsigned int flags); Arguments old_dir parent of source old_dentry source new_dir parent of destination new_dentry destination delegated_inode returns an inode needing a delegation break flags rename flags Description The caller must hold…
vfs_path_lookup – lookup a file path relative to a dentry-vfsmount pair Synopsis int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt, const char *name, unsigned int flags, struct path *path); Arguments dentry pointer to dentry of the base directory mnt pointer to vfs mount of the base directory name pointer to file name flags lookup flags path…
vfs_lock_file – file byte range lock Synopsis int vfs_lock_file(struct file *filp, unsigned int cmd, struct file_lock *fl, struct file_lock *conf); Arguments filp The file to apply the lock to cmd type of locking operation (F_SETLK, F_GETLK, etc.) fl The lock to be applied conf Place to return a copy of the conflicting lock, if found….