1 files changed, 170 insertions, 0 deletions

diff --git a/fs/qnx4/fsync.c b/fs/qnx4/fsync.c
new file mode 100644
index 000000000000..df5bc75d5414
--- /dev/null
+++ b/fs/qnx4/fsync.c
@@ -0,0 +1,170 @@
+/* 
+ * QNX4 file system, Linux implementation.
+ * 
+ * Version : 0.1
+ * 
+ * Using parts of the xiafs filesystem.
+ * 
+ * History :
+ * 
+ * 24-03-1998 by Richard Frowijn : first release.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+
+#include <asm/system.h>
+
+/*
+ * The functions for qnx4 fs file synchronization.
+ */
+
+#ifdef CONFIG_QNX4FS_RW
+
+static int sync_block(struct inode *inode, unsigned short *block, int wait)
+{
+        struct buffer_head *bh;
+        unsigned short tmp;
+
+        if (!*block)
+                return 0;
+        tmp = *block;
+        bh = sb_find_get_block(inode->i_sb, *block);
+        if (!bh)
+                return 0;
+        if (*block != tmp) {
+                brelse(bh);
+                return 1;
+        }
+        if (wait && buffer_req(bh) && !buffer_uptodate(bh)) {
+                brelse(bh);
+                return -1;
+        }
+        if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) {
+                brelse(bh);
+                return 0;
+        }
+        ll_rw_block(WRITE, 1, &bh);
+        atomic_dec(&bh->b_count);
+        return 0;
+}
+
+#ifdef WTF
+static int sync_iblock(struct inode *inode, unsigned short *iblock,
+                       struct buffer_head **bh, int wait)
+{
+        int rc;
+        unsigned short tmp;
+
+        *bh = NULL;
+        tmp = *iblock;
+        if (!tmp)
+                return 0;
+        rc = sync_block(inode, iblock, wait);
+        if (rc)
+                return rc;
+        *bh = sb_bread(inode->i_sb, tmp);
+        if (tmp != *iblock) {
+                brelse(*bh);
+                *bh = NULL;
+                return 1;
+        }
+        if (!*bh)
+                return -1;
+        return 0;
+}
+#endif
+
+static int sync_direct(struct inode *inode, int wait)
+{
+        int i;
+        int rc, err = 0;
+
+        for (i = 0; i < 7; i++) {
+                rc = sync_block(inode,
+                                (unsigned short *) qnx4_raw_inode(inode)->di_first_xtnt.xtnt_blk + i, wait);
+                if (rc > 0)
+                        break;
+                if (rc)
+                        err = rc;
+        }
+        return err;
+}
+
+#ifdef WTF
+static int sync_indirect(struct inode *inode, unsigned short *iblock, int wait)
+{
+        int i;
+        struct buffer_head *ind_bh;
+        int rc, err = 0;
+
+        rc = sync_iblock(inode, iblock, &ind_bh, wait);
+        if (rc || !ind_bh)
+                return rc;
+
+        for (i = 0; i < 512; i++) {
+                rc = sync_block(inode,
+                                ((unsigned short *) ind_bh->b_data) + i,
+                                wait);
+                if (rc > 0)
+                        break;
+                if (rc)
+                        err = rc;
+        }
+        brelse(ind_bh);
+        return err;
+}
+
+static int sync_dindirect(struct inode *inode, unsigned short *diblock,
+                          int wait)
+{
+        int i;
+        struct buffer_head *dind_bh;
+        int rc, err = 0;
+
+        rc = sync_iblock(inode, diblock, &dind_bh, wait);
+        if (rc || !dind_bh)
+                return rc;
+
+        for (i = 0; i < 512; i++) {
+                rc = sync_indirect(inode,
+                                ((unsigned short *) dind_bh->b_data) + i,
+                                   wait);
+                if (rc > 0)
+                        break;
+                if (rc)
+                        err = rc;
+        }
+        brelse(dind_bh);
+        return err;
+}
+#endif
+
+int qnx4_sync_file(struct file *file, struct dentry *dentry, int unused)
+{
+        struct inode *inode = dentry->d_inode;
+        int wait, err = 0;
+        
+        (void) file;
+        if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+              S_ISLNK(inode->i_mode)))
+                return -EINVAL;
+
+        lock_kernel();
+        for (wait = 0; wait <= 1; wait++) {
+                err |= sync_direct(inode, wait);
+        }
+        err |= qnx4_sync_inode(inode);
+        unlock_kernel();
+        return (err < 0) ? -EIO : 0;
+}
+
+#endif