ocfs2: Optionally return filldir errors

Modify ocfs2_dir_foreach_blk() to optionally return any error from the
filldir callback. This way ocfs2_dirforeach() can terminate early, as
opposed to always passing through the entire directory. This fixes a bug
introduced during a previous code refactor where ocfs2_empty_dir() would
loop infinitely.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index e153513..7453b70 100644 (file)
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -588,7 +588,7 @@ bail:
 static int ocfs2_dir_foreach_blk_id(struct inode *inode,
                                    unsigned long *f_version,
                                    loff_t *f_pos, void *priv,
-                                   filldir_t filldir)
+                                   filldir_t filldir, int *filldir_err)
 {
        int ret, i, filldir_ret;
        unsigned long offset = *f_pos;
@@ -659,8 +659,11 @@ revalidate:
                                              *f_pos,
                                              le64_to_cpu(de->inode),
                                              d_type);
-                       if (filldir_ret)
+                       if (filldir_ret) {
+                               if (filldir_err)
+                                       *filldir_err = filldir_ret;
                                break;
+                       }
                        if (version != *f_version)
                                goto revalidate;
                }
@@ -676,7 +679,7 @@ out:
 static int ocfs2_dir_foreach_blk_el(struct inode *inode,
                                    unsigned long *f_version,
                                    loff_t *f_pos, void *priv,
-                                   filldir_t filldir)
+                                   filldir_t filldir, int *filldir_err)
 {
        int error = 0;
        unsigned long offset, blk, last_ra_blk = 0;
@@ -775,8 +778,11 @@ revalidate:
                                                *f_pos,
                                                le64_to_cpu(de->inode),
                                                d_type);
-                               if (error)
+                               if (error) {
+                                       if (filldir_err)
+                                               *filldir_err = error;
                                        break;
+                               }
                                if (version != *f_version)
                                        goto revalidate;
                                stored ++;
@@ -793,13 +799,15 @@ out:
 }
 
 static int ocfs2_dir_foreach_blk(struct inode *inode, unsigned long *f_version,
-                                loff_t *f_pos, void *priv, filldir_t filldir)
+                                loff_t *f_pos, void *priv, filldir_t filldir,
+                                int *filldir_err)
 {
        if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
                return ocfs2_dir_foreach_blk_id(inode, f_version, f_pos, priv,
-                                               filldir);
+                                               filldir, filldir_err);
 
-       return ocfs2_dir_foreach_blk_el(inode, f_version, f_pos, priv, filldir);
+       return ocfs2_dir_foreach_blk_el(inode, f_version, f_pos, priv, filldir,
+                                       filldir_err);
 }
 
 /*
@@ -809,16 +817,19 @@ static int ocfs2_dir_foreach_blk(struct inode *inode, unsigned long *f_version,
 int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv,
                      filldir_t filldir)
 {
-       int ret = 0;
+       int ret = 0, filldir_err = 0;
        unsigned long version = inode->i_version;
 
        while (*f_pos < i_size_read(inode)) {
                ret = ocfs2_dir_foreach_blk(inode, &version, f_pos, priv,
-                                           filldir);
-               if (ret)
+                                           filldir, &filldir_err);
+               if (ret || filldir_err)
                        break;
        }
 
+       if (ret > 0)
+               ret = -EIO;
+
        return 0;
 }
 
@@ -852,7 +863,7 @@ int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir)
        }
 
        error = ocfs2_dir_foreach_blk(inode, &filp->f_version, &filp->f_pos,
-                                     dirent, filldir);
+                                     dirent, filldir, NULL);
 
        ocfs2_meta_unlock(inode, lock_level);