ext3: dirindex error pointer issues
Dmitriy Monakhov [Tue, 8 May 2007 07:25:34 +0000 (00:25 -0700)]
- ext3_dx_find_entry() exit with out setting proper error pointer

- do_split() exit with out setting proper error pointer
  it is realy painful because many callers contain folowing code:

          de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
          if (!(de))
                       return retval;
          <<< WOW retval wasn't changed by do_split(), so caller failed
          <<< but return SUCCESS :)

- Rearrange do_split() error path. Current error path is realy ugly, all
  this up and down jump stuff doesn't make code easy to understand.

[dmonakhov@sw.ru: fix annoying fake error messages]
Signed-off-by: Monakhov Dmitriy <dmonakhov@openvz.org>
Cc: Andreas Dilger <adilger@clusterfs.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Monakhov Dmitriy <dmonakhov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ext3/namei.c
fs/ext4/namei.c

index 49159f1..7edb617 100644 (file)
@@ -969,6 +969,7 @@ static struct buffer_head * ext3_dx_find_entry(struct dentry *dentry,
                                  (block<<EXT3_BLOCK_SIZE_BITS(sb))
                                          +((char *)de - bh->b_data))) {
                                brelse (bh);
+                               *err = ERR_BAD_DX_DIR;
                                goto errout;
                        }
                        *res_dir = de;
@@ -1134,9 +1135,9 @@ static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
        char *data1 = (*bh)->b_data, *data2;
        unsigned split;
        struct ext3_dir_entry_2 *de = NULL, *de2;
-       int     err;
+       int     err = 0;
 
-       bh2 = ext3_append (handle, dir, &newblock, error);
+       bh2 = ext3_append (handle, dir, &newblock, &err);
        if (!(bh2)) {
                brelse(*bh);
                *bh = NULL;
@@ -1145,14 +1146,9 @@ static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 
        BUFFER_TRACE(*bh, "get_write_access");
        err = ext3_journal_get_write_access(handle, *bh);
-       if (err) {
-       journal_error:
-               brelse(*bh);
-               brelse(bh2);
-               *bh = NULL;
-               ext3_std_error(dir->i_sb, err);
-               goto errout;
-       }
+       if (err)
+               goto journal_error;
+
        BUFFER_TRACE(frame->bh, "get_write_access");
        err = ext3_journal_get_write_access(handle, frame->bh);
        if (err)
@@ -1195,8 +1191,16 @@ static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
                goto journal_error;
        brelse (bh2);
        dxtrace(dx_show_index ("frame", frame->entries));
-errout:
        return de;
+
+journal_error:
+       brelse(*bh);
+       brelse(bh2);
+       *bh = NULL;
+       ext3_std_error(dir->i_sb, err);
+errout:
+       *error = err;
+       return NULL;
 }
 #endif
 
index e7e1d79..757c138 100644 (file)
@@ -967,6 +967,7 @@ static struct buffer_head * ext4_dx_find_entry(struct dentry *dentry,
                                  (block<<EXT4_BLOCK_SIZE_BITS(sb))
                                          +((char *)de - bh->b_data))) {
                                brelse (bh);
+                               *err = ERR_BAD_DX_DIR;
                                goto errout;
                        }
                        *res_dir = de;
@@ -1132,9 +1133,9 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
        char *data1 = (*bh)->b_data, *data2;
        unsigned split;
        struct ext4_dir_entry_2 *de = NULL, *de2;
-       int     err;
+       int     err = 0;
 
-       bh2 = ext4_append (handle, dir, &newblock, error);
+       bh2 = ext4_append (handle, dir, &newblock, &err);
        if (!(bh2)) {
                brelse(*bh);
                *bh = NULL;
@@ -1143,14 +1144,9 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 
        BUFFER_TRACE(*bh, "get_write_access");
        err = ext4_journal_get_write_access(handle, *bh);
-       if (err) {
-       journal_error:
-               brelse(*bh);
-               brelse(bh2);
-               *bh = NULL;
-               ext4_std_error(dir->i_sb, err);
-               goto errout;
-       }
+       if (err)
+               goto journal_error;
+
        BUFFER_TRACE(frame->bh, "get_write_access");
        err = ext4_journal_get_write_access(handle, frame->bh);
        if (err)
@@ -1193,8 +1189,16 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
                goto journal_error;
        brelse (bh2);
        dxtrace(dx_show_index ("frame", frame->entries));
-errout:
        return de;
+
+journal_error:
+       brelse(*bh);
+       brelse(bh2);
+       *bh = NULL;
+       ext4_std_error(dir->i_sb, err);
+errout:
+       *error = err;
+       return NULL;
 }
 #endif