1 files changed, 49 insertions, 121 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index b3ae77cccbb6..0b806c5e32eb 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -44,7 +44,7 @@ extern int get_max_files(void);
 struct inodes_stat_t {
         int nr_inodes;
         int nr_unused;
-        int dummy[5];
+        int dummy[5];           /* padding for sysctl ABI compatibility */
 };
 extern struct inodes_stat_t inodes_stat;
 
@@ -283,11 +283,14 @@ extern int dir_notify_enable;
 #include <linux/init.h>
 #include <linux/pid.h>
 #include <linux/mutex.h>
+#include <linux/sysctl.h>
+#include <linux/capability.h>
 
 #include <asm/atomic.h>
 #include <asm/semaphore.h>
 #include <asm/byteorder.h>
 
+struct export_operations;
 struct hd_geometry;
 struct iovec;
 struct nameidata;
@@ -820,6 +823,10 @@ struct file_lock {
         union {
                 struct nfs_lock_info    nfs_fl;
                 struct nfs4_lock_info   nfs4_fl;
+                struct {
+                        struct list_head link;  /* link in AFS vnode's pending_locks list */
+                        int state;              /* state of grant or error if -ve */
+                } afs;
         } fl_u;
 };
 
@@ -984,6 +991,9 @@ enum {
 #define put_fs_excl() atomic_dec(&current->fs_excl)
 #define has_fs_excl() atomic_read(&current->fs_excl)
 
+#define is_owner_or_cap(inode)  \
+        ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
+
 /* not quite ready to be deprecated, but... */
 extern void lock_super(struct super_block *);
 extern void unlock_super(struct super_block *);
@@ -1054,7 +1064,7 @@ struct block_device_operations {
 };
 
 /*
- * "descriptor" for what we're up to with a read for sendfile().
+ * "descriptor" for what we're up to with a read.
  * This allows us to use the same read code yet
  * have multiple different users of the data that
  * we read from a file.
@@ -1105,7 +1115,6 @@ struct file_operations {
         int (*aio_fsync) (struct kiocb *, int datasync);
         int (*fasync) (int, struct file *, int);
         int (*lock) (struct file *, int, struct file_lock *);
-        ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
         ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
         unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
         int (*check_flags)(int);
@@ -1138,6 +1147,8 @@ struct inode_operations {
         ssize_t (*listxattr) (struct dentry *, char *, size_t);
         int (*removexattr) (struct dentry *, const char *);
         void (*truncate_range)(struct inode *, loff_t, loff_t);
+        long (*fallocate)(struct inode *inode, int mode, loff_t offset,
+                          loff_t len);
 };
 
 struct seq_file;
@@ -1211,6 +1222,14 @@ static inline void mark_inode_dirty_sync(struct inode *inode)
         __mark_inode_dirty(inode, I_DIRTY_SYNC);
 }
 
+/**
+ * inc_nlink - directly increment an inode's link count
+ * @inode: inode
+ *
+ * This is a low-level filesystem helper to replace any
+ * direct filesystem manipulation of i_nlink.  Currently,
+ * it is only here for parity with dec_nlink().
+ */
 static inline void inc_nlink(struct inode *inode)
 {
         inode->i_nlink++;
@@ -1222,11 +1241,30 @@ static inline void inode_inc_link_count(struct inode *inode)
         mark_inode_dirty(inode);
 }
 
+/**
+ * drop_nlink - directly drop an inode's link count
+ * @inode: inode
+ *
+ * This is a low-level filesystem helper to replace any
+ * direct filesystem manipulation of i_nlink.  In cases
+ * where we are attempting to track writes to the
+ * filesystem, a decrement to zero means an imminent
+ * write when the file is truncated and actually unlinked
+ * on the filesystem.
+ */
 static inline void drop_nlink(struct inode *inode)
 {
         inode->i_nlink--;
 }
 
+/**
+ * clear_nlink - directly zero an inode's link count
+ * @inode: inode
+ *
+ * This is a low-level filesystem helper to replace any
+ * direct filesystem manipulation of i_nlink.  See
+ * drop_nlink() for why we care about i_nlink hitting zero.
+ */
 static inline void clear_nlink(struct inode *inode)
 {
         inode->i_nlink = 0;
@@ -1247,119 +1285,6 @@ static inline void file_accessed(struct file *file)
 
 int sync_inode(struct inode *inode, struct writeback_control *wbc);
 
-/**
- * struct export_operations - for nfsd to communicate with file systems
- * @decode_fh:      decode a file handle fragment and return a &struct dentry
- * @encode_fh:      encode a file handle fragment from a dentry
- * @get_name:       find the name for a given inode in a given directory
- * @get_parent:     find the parent of a given directory
- * @get_dentry:     find a dentry for the inode given a file handle sub-fragment
- * @find_exported_dentry:
- *      set by the exporting module to a standard helper function.
- *
- * Description:
- *    The export_operations structure provides a means for nfsd to communicate
- *    with a particular exported file system  - particularly enabling nfsd and
- *    the filesystem to co-operate when dealing with file handles.
- *
- *    export_operations contains two basic operation for dealing with file
- *    handles, decode_fh() and encode_fh(), and allows for some other
- *    operations to be defined which standard helper routines use to get
- *    specific information from the filesystem.
- *
- *    nfsd encodes information use to determine which filesystem a filehandle
- *    applies to in the initial part of the file handle.  The remainder, termed
- *    a file handle fragment, is controlled completely by the filesystem.  The
- *    standard helper routines assume that this fragment will contain one or
- *    two sub-fragments, one which identifies the file, and one which may be
- *    used to identify the (a) directory containing the file.
- *
- *    In some situations, nfsd needs to get a dentry which is connected into a
- *    specific part of the file tree.  To allow for this, it passes the
- *    function acceptable() together with a @context which can be used to see
- *    if the dentry is acceptable.  As there can be multiple dentrys for a
- *    given file, the filesystem should check each one for acceptability before
- *    looking for the next.  As soon as an acceptable one is found, it should
- *    be returned.
- *
- * decode_fh:
- *    @decode_fh is given a &struct super_block (@sb), a file handle fragment
- *    (@fh, @fh_len) and an acceptability testing function (@acceptable,
- *    @context).  It should return a &struct dentry which refers to the same
- *    file that the file handle fragment refers to,  and which passes the
- *    acceptability test.  If it cannot, it should return a %NULL pointer if
- *    the file was found but no acceptable &dentries were available, or a
- *    %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
- *    %ENOMEM).
- *
- * encode_fh:
- *    @encode_fh should store in the file handle fragment @fh (using at most
- *    @max_len bytes) information that can be used by @decode_fh to recover the
- *    file refered to by the &struct dentry @de.  If the @connectable flag is
- *    set, the encode_fh() should store sufficient information so that a good
- *    attempt can be made to find not only the file but also it's place in the
- *    filesystem.   This typically means storing a reference to de->d_parent in
- *    the filehandle fragment.  encode_fh() should return the number of bytes
- *    stored or a negative error code such as %-ENOSPC
- *
- * get_name:
- *    @get_name should find a name for the given @child in the given @parent
- *    directory.  The name should be stored in the @name (with the
- *    understanding that it is already pointing to a a %NAME_MAX+1 sized
- *    buffer.   get_name() should return %0 on success, a negative error code
- *    or error.  @get_name will be called without @parent->i_mutex held.
- *
- * get_parent:
- *    @get_parent should find the parent directory for the given @child which
- *    is also a directory.  In the event that it cannot be found, or storage
- *    space cannot be allocated, a %ERR_PTR should be returned.
- *
- * get_dentry:
- *    Given a &super_block (@sb) and a pointer to a file-system specific inode
- *    identifier, possibly an inode number, (@inump) get_dentry() should find
- *    the identified inode and return a dentry for that inode.  Any suitable
- *    dentry can be returned including, if necessary, a new dentry created with
- *    d_alloc_root.  The caller can then find any other extant dentrys by
- *    following the d_alias links.  If a new dentry was created using
- *    d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
- *    should be d_rehash()ed.
- *
- *    If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
- *    can be returned.  The @inump will be whatever was passed to
- *    nfsd_find_fh_dentry() in either the @obj or @parent parameters.
- *
- * Locking rules:
- *    get_parent is called with child->d_inode->i_mutex down
- *    get_name is not (which is possibly inconsistent)
- */
-
-struct export_operations {
-        struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
-                         int (*acceptable)(void *context, struct dentry *de),
-                         void *context);
-        int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
-                         int connectable);
-
-        /* the following are only called from the filesystem itself */
-        int (*get_name)(struct dentry *parent, char *name,
-                        struct dentry *child);
-        struct dentry * (*get_parent)(struct dentry *child);
-        struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
-
-        /* This is set by the exporting module to a standard helper */
-        struct dentry * (*find_exported_dentry)(
-                struct super_block *sb, void *obj, void *parent,
-                int (*acceptable)(void *context, struct dentry *de),
-                void *context);
-
-
-};
-
-extern struct dentry *
-find_exported_dentry(struct super_block *sb, void *obj, void *parent,
-                     int (*acceptable)(void *context, struct dentry *de),
-                     void *context);
-
 struct file_system_type {
         const char *name;
         int fs_flags;
@@ -1496,7 +1421,7 @@ extern void putname(const char *name);
 
 #ifdef CONFIG_BLOCK
 extern int register_blkdev(unsigned int, const char *);
-extern int unregister_blkdev(unsigned int, const char *);
+extern void unregister_blkdev(unsigned int, const char *);
 extern struct block_device *bdget(dev_t);
 extern void bd_set_size(struct block_device *, loff_t size);
 extern void bd_forget(struct inode *inode);
@@ -1584,6 +1509,9 @@ extern int __invalidate_device(struct block_device *);
 extern int invalidate_partition(struct gendisk *, int);
 #endif
 extern int invalidate_inodes(struct super_block *);
+unsigned long __invalidate_mapping_pages(struct address_space *mapping,
+                                        pgoff_t start, pgoff_t end,
+                                        bool be_atomic);
 unsigned long invalidate_mapping_pages(struct address_space *mapping,
                                         pgoff_t start, pgoff_t end);
 
@@ -1735,7 +1663,6 @@ extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
                 unsigned long, loff_t, loff_t *, size_t, ssize_t);
 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
-extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
 extern void do_generic_mapping_read(struct address_space *mapping,
                                     struct file_ra_state *, struct file *,
                                     loff_t *, read_descriptor_t *, read_actor_t);
@@ -1765,9 +1692,6 @@ extern int nonseekable_open(struct inode * inode, struct file * filp);
 #ifdef CONFIG_FS_XIP
 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
                              loff_t *ppos);
-extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
-                                 size_t count, read_actor_t actor,
-                                 void *target);
 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
                               size_t len, loff_t *ppos);
@@ -2021,5 +1945,9 @@ static inline void free_secdata(void *secdata)
 { }
 #endif  /* CONFIG_SECURITY */
 
+int proc_nr_files(ctl_table *table, int write, struct file *filp,
+                  void __user *buffer, size_t *lenp, loff_t *ppos);
+
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_FS_H */