Revert "ext4: allow readdir()'s of large empty directories to be interrupted"

This reverts commit 1028b55bafb7611dda1d8fed2aeca16a436b7dff.

It's broken: it makes ext4 return an error at an invalid point, causing
the readdir wrappers to write the the position of the last successful
directory entry into the position field, which means that the next
readdir will now return that last successful entry _again_.

You can only return fatal errors (that terminate the readdir directory
walk) from within the filesystem readdir functions, the "normal" errors
(that happen when the readdir buffer fills up, for example) happen in
the iterorator where we know the position of the actual failing entry.

I do have a very different patch that does the "signal_pending()"
handling inside the iterator function where it is allowable, but while
that one passes all the sanity checks, I screwed up something like four
times while emailing it out, so I'm not going to commit it today.

So my track record is not good enough, and the stars will have to align
better before that one gets committed.  And it would be good to get some
review too, of course, since celestial alignments are always an iffy
debugging model.

IOW, let's just revert the commit that caused the problem for now.

Reported-by: Greg Thelen <gthelen@google.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 4173bfe21114fb94f644e5d5917711aba7deab88..561d7308b393a0347dea3b1344f409bf5fed0139 100644 (file)
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -150,11 +150,6 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
        while (ctx->pos < inode->i_size) {
                struct ext4_map_blocks map;
 
-               if (fatal_signal_pending(current)) {
-                       err = -ERESTARTSYS;
-                       goto errout;
-               }
-               cond_resched();
                map.m_lblk = ctx->pos >> EXT4_BLOCK_SIZE_BITS(sb);
                map.m_len = 1;
                err = ext4_map_blocks(NULL, inode, &map, 0);

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index db98f89f737f05827cc4371c939a29ec31ee4ef2..48e4b8907826eca52a1e94e14bdfdb0fd2240c56 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1107,11 +1107,6 @@ int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
        }
 
        while (1) {
-               if (signal_pending(current)) {
-                       err = -ERESTARTSYS;
-                       goto errout;
-               }
-               cond_resched();
                block = dx_get_block(frame->at);
                ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
                                             start_hash, start_minor_hash);