4 files changed, 40 insertions, 13 deletions

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index e0cce2a5f820..e540a24e5d06 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -114,7 +114,6 @@ prototypes:
         int (*drop_inode) (struct inode *);
         void (*evict_inode) (struct inode *);
         void (*put_super) (struct super_block *);
-        void (*write_super) (struct super_block *);
         int (*sync_fs)(struct super_block *sb, int wait);
         int (*freeze_fs) (struct super_block *);
         int (*unfreeze_fs) (struct super_block *);
@@ -136,10 +135,9 @@ write_inode:
 drop_inode:                             !!!inode->i_lock!!!
 evict_inode:
 put_super:              write
-write_super:            read
 sync_fs:                read
-freeze_fs:              read
-unfreeze_fs:            read
+freeze_fs:              write
+unfreeze_fs:            write
 statfs:                 maybe(read)     (see below)
 remount_fs:             write
 umount_begin:           no
@@ -206,6 +204,8 @@ prototypes:
         int (*launder_page)(struct page *);
         int (*is_partially_uptodate)(struct page *, read_descriptor_t *, unsigned long);
         int (*error_remove_page)(struct address_space *, struct page *);
+        int (*swap_activate)(struct file *);
+        int (*swap_deactivate)(struct file *);
 
 locking rules:
         All except set_page_dirty and freepage may block
@@ -229,6 +229,8 @@ migratepage:		yes (both)
 launder_page:           yes
 is_partially_uptodate:  yes
 error_remove_page:      yes
+swap_activate:          no
+swap_deactivate:        no
 
         ->write_begin(), ->write_end(), ->sync_page() and ->readpage()
 may be called from the request handler (/dev/loop).
@@ -330,6 +332,15 @@ cleaned, or an error value if not. Note that in order to prevent the page
 getting mapped back in and redirtied, it needs to be kept locked
 across the entire operation.
 
+        ->swap_activate will be called with a non-zero argument on
+files backing (non block device backed) swapfiles. A return value
+of zero indicates success, in which case this file can be used for
+backing swapspace. The swapspace operations will be proxied to the
+address space operations.
+
+        ->swap_deactivate() will be called in the sys_swapoff()
+path after ->swap_activate() returned success.
+
 ----------------------- file_lock_operations ------------------------------
 prototypes:
         void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
@@ -346,7 +357,6 @@ prototypes:
         int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
         void (*lm_notify)(struct file_lock *);  /* unblock callback */
         int (*lm_grant)(struct file_lock *, struct file_lock *, int);
-        void (*lm_release_private)(struct file_lock *);
         void (*lm_break)(struct file_lock *); /* break_lease callback */
         int (*lm_change)(struct file_lock **, int);
 
@@ -355,7 +365,6 @@ locking rules:
 lm_compare_owner:       yes             no
 lm_notify:              yes             no
 lm_grant:               no              no
-lm_release_private:     maybe           no
 lm_break:               yes             no
 lm_change               yes             no
 
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index 2bef2b3843d1..0742feebc6e2 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -94,9 +94,8 @@ protected.
 ---
 [mandatory]
 
-BKL is also moved from around sb operations.  ->write_super() Is now called 
-without BKL held.  BKL should have been shifted into individual fs sb_op
-functions.  If you don't need it, remove it.  
+BKL is also moved from around sb operations. BKL should have been shifted into
+individual fs sb_op functions.  If you don't need it, remove it.
 
 ---
 [informational]
diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt
index ead764b2728f..de1e6c4dccff 100644
--- a/Documentation/filesystems/vfat.txt
+++ b/Documentation/filesystems/vfat.txt
@@ -137,6 +137,17 @@ errors=panic|continue|remount-ro
                  without doing anything or remount the partition in
                  read-only mode (default behavior).
 
+discard       -- If set, issues discard/TRIM commands to the block
+                 device when blocks are freed. This is useful for SSD devices
+                 and sparse/thinly-provisoned LUNs.
+
+nfs           -- This option maintains an index (cache) of directory
+                 inodes by i_logstart which is used by the nfs-related code to
+                 improve look-ups.
+
+                 Enable this only if you want to export the FAT filesystem
+                 over NFS
+
 <bool>: 0,1,yes,no,true,false
 
 TODO
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index aa754e01464e..2ee133e030c3 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -216,7 +216,6 @@ struct super_operations {
         void (*drop_inode) (struct inode *);
         void (*delete_inode) (struct inode *);
         void (*put_super) (struct super_block *);
-        void (*write_super) (struct super_block *);
         int (*sync_fs)(struct super_block *sb, int wait);
         int (*freeze_fs) (struct super_block *);
         int (*unfreeze_fs) (struct super_block *);
@@ -273,9 +272,6 @@ or bottom half).
   put_super: called when the VFS wishes to free the superblock
         (i.e. unmount). This is called with the superblock lock held
 
-  write_super: called when the VFS superblock needs to be written to
-        disc. This method is optional
-
   sync_fs: called when VFS is writing out all dirty data associated with
         a superblock. The second parameter indicates whether the method
         should wait until the write out has been completed. Optional.
@@ -592,6 +588,8 @@ struct address_space_operations {
         int (*migratepage) (struct page *, struct page *);
         int (*launder_page) (struct page *);
         int (*error_remove_page) (struct mapping *mapping, struct page *page);
+        int (*swap_activate)(struct file *);
+        int (*swap_deactivate)(struct file *);
 };
 
   writepage: called by the VM to write a dirty page to backing store.
@@ -760,6 +758,16 @@ struct address_space_operations {
         Setting this implies you deal with pages going away under you,
         unless you have them locked or reference counts increased.
 
+  swap_activate: Called when swapon is used on a file to allocate
+        space if necessary and pin the block lookup information in
+        memory. A return value of zero indicates success,
+        in which case this file can be used to back swapspace. The
+        swapspace operations will be proxied to this address space's
+        ->swap_{out,in} methods.
+
+  swap_deactivate: Called during swapoff on files where swap_activate
+        was successful.
+
 
 The File Object
 ===============