mm/fs: remove truncate_range

Remove vmtruncate_range(), and remove the truncate_range method from
struct inode_operations: only tmpfs ever supported it, and tmpfs has now
converted over to using the fallocate method of file_operations.

Update Documentation accordingly, adding (setlease and) fallocate lines.
And while we're in mm.h, remove duplicate declarations of shmem_lock() and
shmem_file_setup(): everyone is now using the ones in shmem_fs.h.

Based-on-patch-by: Cong Wang <amwang@redhat.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Cong Wang <amwang@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 4fca82e..d449e63 100644 (file)
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -60,7 +60,6 @@ ata *);
        ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
        ssize_t (*listxattr) (struct dentry *, char *, size_t);
        int (*removexattr) (struct dentry *, const char *);
-       void (*truncate_range)(struct inode *, loff_t, loff_t);
        int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, u64 len);
 
 locking rules:
@@ -87,7 +86,6 @@ setxattr:     yes
 getxattr:      no
 listxattr:     no
 removexattr:   yes
-truncate_range:        yes
 fiemap:                no
        Additionally, ->rmdir(), ->unlink() and ->rename() have ->i_mutex on
 victim.

diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 0d04920..ef19f91 100644 (file)
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -363,7 +363,6 @@ struct inode_operations {
        ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
        ssize_t (*listxattr) (struct dentry *, char *, size_t);
        int (*removexattr) (struct dentry *, const char *);
-       void (*truncate_range)(struct inode *, loff_t, loff_t);
 };
 
 Again, all methods are called without any locks being held, unless
@@ -472,9 +471,6 @@ otherwise noted.
   removexattr: called by the VFS to remove an extended attribute from
        a file. This method is called by removexattr(2) system call.
 
-  truncate_range: a method provided by the underlying filesystem to truncate a
-       range of blocks , i.e. punch a hole somewhere in a file.
-
 
 The Address Space Object
 ========================
@@ -760,7 +756,7 @@ struct file_operations
 ----------------------
 
 This describes how the VFS can manipulate an open file. As of kernel
-2.6.22, the following members are defined:
+3.5, the following members are defined:
 
 struct file_operations {
        struct module *owner;
@@ -790,6 +786,8 @@ struct file_operations {
        int (*flock) (struct file *, int, struct file_lock *);
        ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, size_t, unsigned int);
        ssize_t (*splice_read)(struct file *, struct pipe_inode_info *, size_t, unsigned int);
+       int (*setlease)(struct file *, long arg, struct file_lock **);
+       long (*fallocate)(struct file *, int mode, loff_t offset, loff_t len);
 };
 
 Again, all methods are called without any locks being held, unless
@@ -858,6 +856,11 @@ otherwise noted.
   splice_read: called by the VFS to splice data from file to a pipe. This
               method is used by the splice(2) system call
 
+  setlease: called by the VFS to set or release a file lock lease.
+           setlease has the file_lock_lock held and must not sleep.
+
+  fallocate: called by the VFS to preallocate blocks or punch a hole.
+
 Note that the file operations are implemented by the specific
 filesystem in which the inode resides. When opening a device node
 (character or block special) most filesystems will call special

diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index 37268c5..1b35d6b 100644 (file)
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -292,7 +292,6 @@ static const struct inode_operations bad_inode_ops =
        .getxattr       = bad_inode_getxattr,
        .listxattr      = bad_inode_listxattr,
        .removexattr    = bad_inode_removexattr,
-       /* truncate_range returns void */
 };
 
 

diff --git a/include/linux/fs.h b/include/linux/fs.h
index cdc1a96..038076b 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1681,7 +1681,6 @@ struct inode_operations {
        ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
        ssize_t (*listxattr) (struct dentry *, char *, size_t);
        int (*removexattr) (struct dentry *, const char *);
-       void (*truncate_range)(struct inode *, loff_t, loff_t);
        int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
                      u64 len);
 } ____cacheline_aligned;

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7d5c37f..aa20baf 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -871,8 +871,6 @@ extern void pagefault_out_of_memory(void);
 extern void show_free_areas(unsigned int flags);
 extern bool skip_free_areas_node(unsigned int flags, int nid);
 
-int shmem_lock(struct file *file, int lock, struct user_struct *user);
-struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags);
 int shmem_zero_setup(struct vm_area_struct *);
 
 extern int can_do_mlock(void);
@@ -951,11 +949,9 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping,
 extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new);
 extern void truncate_setsize(struct inode *inode, loff_t newsize);
 extern int vmtruncate(struct inode *inode, loff_t offset);
-extern int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end);
 void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end);
 int truncate_inode_page(struct address_space *mapping, struct page *page);
 int generic_error_remove_page(struct address_space *mapping, struct page *page);
-
 int invalidate_inode_page(struct page *page);
 
 #ifdef CONFIG_MMU

diff --git a/mm/shmem.c b/mm/shmem.c
index 7e54ff1..f368d0a 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2541,7 +2541,6 @@ static const struct file_operations shmem_file_operations = {
 
 static const struct inode_operations shmem_inode_operations = {
        .setattr        = shmem_setattr,
-       .truncate_range = shmem_truncate_range,
 #ifdef CONFIG_TMPFS_XATTR
        .setxattr       = shmem_setxattr,
        .getxattr       = shmem_getxattr,

diff --git a/mm/truncate.c b/mm/truncate.c
index 61a183b..75801ac 100644 (file)
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -602,31 +602,6 @@ int vmtruncate(struct inode *inode, loff_t newsize)
 }
 EXPORT_SYMBOL(vmtruncate);
 
-int vmtruncate_range(struct inode *inode, loff_t lstart, loff_t lend)
-{
-       struct address_space *mapping = inode->i_mapping;
-       loff_t holebegin = round_up(lstart, PAGE_SIZE);
-       loff_t holelen = 1 + lend - holebegin;
-
-       /*
-        * If the underlying filesystem is not going to provide
-        * a way to truncate a range of blocks (punch a hole) -
-        * we should return failure right now.
-        */
-       if (!inode->i_op->truncate_range)
-               return -ENOSYS;
-
-       mutex_lock(&inode->i_mutex);
-       inode_dio_wait(inode);
-       unmap_mapping_range(mapping, holebegin, holelen, 1);
-       inode->i_op->truncate_range(inode, lstart, lend);
-       /* unmap again to remove racily COWed private pages */
-       unmap_mapping_range(mapping, holebegin, holelen, 1);
-       mutex_unlock(&inode->i_mutex);
-
-       return 0;
-}
-
 /**
  * truncate_pagecache_range - unmap and remove pagecache that is hole-punched
  * @inode: inode