X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fsync.c;h=228e17b5e9ee911c2c2f58b4090e33b96954ff23;hb=46ae220bea40bd1cf4abec2d5cdfb4f9396c7115;hp=955aef04da289fecb80f51981ae98f538e6bcdc2;hpb=111ebb6e6f7bd7de6d722c5848e95621f43700d9;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/sync.c b/fs/sync.c
index 955aef0..228e17b 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -6,15 +6,129 @@
 #include <linux/file.h>
 #include <linux/fs.h>
 #include <linux/module.h>
+#include <linux/sched.h>
 #include <linux/writeback.h>
 #include <linux/syscalls.h>
 #include <linux/linkage.h>
 #include <linux/pagemap.h>
+#include <linux/quotaops.h>
+#include <linux/buffer_head.h>
 
 #define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
 			SYNC_FILE_RANGE_WAIT_AFTER)
 
 /*
+ * sync everything.  Start out by waking pdflush, because that writes back
+ * all queues in parallel.
+ */
+static void do_sync(unsigned long wait)
+{
+	wakeup_pdflush(0);
+	sync_inodes(0);		/* All mappings, inodes and their blockdevs */
+	DQUOT_SYNC(NULL);
+	sync_supers();		/* Write the superblocks */
+	sync_filesystems(0);	/* Start syncing the filesystems */
+	sync_filesystems(wait);	/* Waitingly sync the filesystems */
+	sync_inodes(wait);	/* Mappings, inodes and blockdevs, again. */
+	if (!wait)
+		printk("Emergency Sync complete\n");
+	if (unlikely(laptop_mode))
+		laptop_sync_completion();
+}
+
+asmlinkage long sys_sync(void)
+{
+	do_sync(1);
+	return 0;
+}
+
+void emergency_sync(void)
+{
+	pdflush_operation(do_sync, 0);
+}
+
+/*
+ * Generic function to fsync a file.
+ *
+ * filp may be NULL if called via the msync of a vma.
+ */
+int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
+{
+	struct inode * inode = dentry->d_inode;
+	struct super_block * sb;
+	int ret, err;
+
+	/* sync the inode to buffers */
+	ret = write_inode_now(inode, 0);
+
+	/* sync the superblock to buffers */
+	sb = inode->i_sb;
+	lock_super(sb);
+	if (sb->s_dirt && sb->s_op->write_super)
+		sb->s_op->write_super(sb);
+	unlock_super(sb);
+
+	/* .. finally sync the buffers to disk */
+	err = sync_blockdev(sb->s_bdev);
+	if (!ret)
+		ret = err;
+	return ret;
+}
+
+long do_fsync(struct file *file, int datasync)
+{
+	int ret;
+	int err;
+	struct address_space *mapping = file->f_mapping;
+
+	if (!file->f_op || !file->f_op->fsync) {
+		/* Why?  We can still call filemap_fdatawrite */
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = filemap_fdatawrite(mapping);
+
+	/*
+	 * 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_path.dentry, datasync);
+	if (!ret)
+		ret = err;
+	mutex_unlock(&mapping->host->i_mutex);
+	err = filemap_fdatawait(mapping);
+	if (!ret)
+		ret = err;
+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);
+}
+
+asmlinkage long sys_fdatasync(unsigned int fd)
+{
+	return __do_fsync(fd, 1);
+}
+
+/*
  * sys_sync_file_range() permits finely controlled syncing over a segment of
  * a file in the range offset .. (offset+nbytes-1) inclusive.  If nbytes is
  * zero then sys_sync_file_range() will operate from offset out to EOF.
@@ -109,29 +223,35 @@ asmlinkage long sys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
 	if (!file)
 		goto out;
 
-	i_mode = file->f_dentry->d_inode->i_mode;
+	i_mode = file->f_path.dentry->d_inode->i_mode;
 	ret = -ESPIPE;
 	if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
 			!S_ISLNK(i_mode))
 		goto out_put;
 
-	ret = do_sync_file_range(file, offset, endbyte, flags);
+	ret = do_sync_mapping_range(file->f_mapping, offset, endbyte, flags);
 out_put:
 	fput_light(file, fput_needed);
 out:
 	return ret;
 }
 
+/* It would be nice if people remember that not all the world's an i386
+   when they introduce new system calls */
+asmlinkage long sys_sync_file_range2(int fd, unsigned int flags,
+				     loff_t offset, loff_t nbytes)
+{
+	return sys_sync_file_range(fd, offset, nbytes, flags);
+}
+
 /*
  * `endbyte' is inclusive
  */
-int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte,
-			unsigned int flags)
+int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
+			  loff_t endbyte, unsigned int flags)
 {
 	int ret;
-	struct address_space *mapping;
 
-	mapping = file->f_mapping;
 	if (!mapping) {
 		ret = -EINVAL;
 		goto out;
@@ -161,4 +281,4 @@ int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte,
 out:
 	return ret;
 }
-EXPORT_SYMBOL_GPL(do_sync_file_range);
+EXPORT_SYMBOL_GPL(do_sync_mapping_range);