[PATCH] fsync: extract internal code

Pull the guts out of do_fsync() - we can use it elsewhere.

Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/buffer.c b/fs/buffer.c
index 24262ea..6d77ce9 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -327,31 +327,24 @@ int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
        return ret;
 }
 
-static long do_fsync(unsigned int fd, int datasync)
+long do_fsync(struct file *file, int datasync)
 {
-       struct file * file;
-       struct address_space *mapping;
-       int ret, err;
-
-       ret = -EBADF;
-       file = fget(fd);
-       if (!file)
-               goto out;
+       int ret;
+       int err;
+       struct address_space *mapping = file->f_mapping;
 
-       ret = -EINVAL;
        if (!file->f_op || !file->f_op->fsync) {
                /* Why?  We can still call filemap_fdatawrite */
-               goto out_putf;
+               ret = -EINVAL;
+               goto out;
        }
 
-       mapping = file->f_mapping;
-
        current->flags |= PF_SYNCWRITE;
        ret = filemap_fdatawrite(mapping);
 
        /*
-        * We need to protect against concurrent writers,
-        * which could cause livelocks in fsync_buffers_list
+        * We need to protect against concurrent writers, which could cause
+        * livelocks in fsync_buffers_list().
         */
        mutex_lock(&mapping->host->i_mutex);
        err = file->f_op->fsync(file, file->f_dentry, datasync);
@@ -362,21 +355,31 @@ static long do_fsync(unsigned int fd, int datasync)
        if (!ret)
                ret = err;
        current->flags &= ~PF_SYNCWRITE;
-
-out_putf:
-       fput(file);
 out:
        return ret;
 }
 
+static long __do_fsync(unsigned int fd, int datasync)
+{
+       struct file *file;
+       int ret = -EBADF;
+
+       file = fget(fd);
+       if (file) {
+               ret = do_fsync(file, datasync);
+               fput(file);
+       }
+       return ret;
+}
+
 asmlinkage long sys_fsync(unsigned int fd)
 {
-       return do_fsync(fd, 0);
+       return __do_fsync(fd, 0);
 }
 
 asmlinkage long sys_fdatasync(unsigned int fd)
 {
-       return do_fsync(fd, 1);
+       return __do_fsync(fd, 1);
 }
 
 /*

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 092cfae..215696a 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1478,6 +1478,7 @@ extern int wait_on_page_writeback_range(struct address_space *mapping,
 extern int __filemap_fdatawrite_range(struct address_space *mapping,
                                loff_t start, loff_t end, int sync_mode);
 
+extern long do_fsync(struct file *file, int datasync);
 extern void sync_supers(void);
 extern void sync_filesystems(int wait);
 extern void emergency_sync(void);