access_process_vm device memory infrastructure

[pandora-kernel.git] / Documentation / filesystems / Locking

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 42d4b30..680fb56 100644 (file)
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -92,7 +92,6 @@ prototypes:
        void (*destroy_inode)(struct inode *);
        void (*dirty_inode) (struct inode *);
        int (*write_inode) (struct inode *, int);
-       void (*put_inode) (struct inode *);
        void (*drop_inode) (struct inode *);
        void (*delete_inode) (struct inode *);
        void (*put_super) (struct super_block *);
@@ -115,7 +114,6 @@ alloc_inode:                no      no      no
 destroy_inode:         no
 dirty_inode:           no                              (must not sleep)
 write_inode:           no
-put_inode:             no
 drop_inode:            no                              !!!inode_lock!!!
 delete_inode:          no
 put_super:             yes     yes     no
@@ -511,16 +509,16 @@ prototypes:
        void (*open)(struct vm_area_struct*);
        void (*close)(struct vm_area_struct*);
        int (*fault)(struct vm_area_struct*, struct vm_fault *);
-       struct page *(*nopage)(struct vm_area_struct*, unsigned long, int *);
        int (*page_mkwrite)(struct vm_area_struct *, struct page *);
+       int (*access)(struct vm_area_struct *, unsigned long, void*, int, int);
 
 locking rules:
                BKL     mmap_sem        PageLocked(page)
 open:          no      yes
 close:         no      yes
 fault:         no      yes
-nopage:                no      yes
 page_mkwrite:  no      yes             no
+access:                no      yes
 
        ->page_mkwrite() is called when a previously read-only page is
 about to become writeable. The file system is responsible for
@@ -529,6 +527,11 @@ taking to lock out truncate, the page range should be verified to be
 within i_size. The page mapping should also be checked that it is not
 NULL.
 
+       ->access() is called when get_user_pages() fails in
+acces_process_vm(), typically used to debug a process through
+/proc/pid/mem or ptrace.  This function is needed only for
+VM_IO | VM_PFNMAP VMAs.
+
 ================================================================================
                        Dubious stuff
 
@@ -537,4 +540,3 @@ NULL.
 
 ipc/shm.c::shm_delete() - may need BKL.
 ->read() and ->write() in many drivers are (probably) missing BKL.
-drivers/sgi/char/graphics.c::sgi_graphics_nopage() - may need BKL.