On Thu, Jun 20, 2013 at 01:44:56AM -0400, jon ernst wrote:
> comparing unsigned variable with 0 always return false.
> err = 0 is duplicated and unnecessary.
>
> Signed-off-by: "Jon Ernst" <jonernst07@xxxxxxx>
I've applied this with a few changes.
(a) your patch was white space corrupted
(b) one of the err = 0 which you removed was actually necessary.
I've reworked the error handling in ext4_block_zero_page_range() so
it's a bit more obvious.
Also your change showed up a potential issue with ext4_write_end(), in
that ext4_write_inline_data_end() returns an int, which can be
negative in the case of an error, and it's assigning this to copied,
which is an unsigned int.
- Ted
>From 6e4837a3e8bc04a1c49f8668c32ce3239968a8ce Mon Sep 17 00:00:00 2001
From: jon ernst <jonernst07@xxxxxxx>
Date: Thu, 20 Jun 2013 10:42:05 -0400
Subject: [PATCH] ext4: delete unnecessary C statements
Comparing unsigned variable with 0 always returns false.
err = 0 is duplicated and unnecessary.
Signed-off-by: "Jon Ernst" <jonernst07@xxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
----
---
fs/ext4/inode.c | 12 ++----------
1 file changed, 2 insertions(+), 10 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 78cf398..baf5c2b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1100,8 +1100,6 @@ static int ext4_write_end(struct file *file,
if (i_size_changed)
ext4_mark_inode_dirty(handle, inode);
- if (copied < 0)
- ret = copied;
if (pos + len > inode->i_size && ext4_can_truncate(inode))
/* if we have allocated more blocks and copied
* less. We will have blocks allocated outside
@@ -3336,7 +3334,7 @@ int ext4_block_zero_page_range(handle_t *handle,
struct inode *inode = mapping->host;
struct buffer_head *bh;
struct page *page;
- int err = 0;
+ int err;
page = find_or_create_page(mapping, from >> PAGE_CACHE_SHIFT,
mapping_gfp_mask(mapping) & ~__GFP_FS);
@@ -3366,13 +3364,10 @@ int ext4_block_zero_page_range(handle_t *handle,
iblock++;
pos += blocksize;
}
-
- err = 0;
if (buffer_freed(bh)) {
BUFFER_TRACE(bh, "freed: skip");
goto unlock;
}
-
if (!buffer_mapped(bh)) {
BUFFER_TRACE(bh, "unmapped");
ext4_get_block(inode, iblock, bh, 0);
@@ -3395,22 +3390,19 @@ int ext4_block_zero_page_range(handle_t *handle,
if (!buffer_uptodate(bh))
goto unlock;
}
-
if (ext4_should_journal_data(inode)) {
BUFFER_TRACE(bh, "get write access");
err = ext4_journal_get_write_access(handle, bh);
if (err)
goto unlock;
}
-
zero_user(page, offset, length);
-
BUFFER_TRACE(bh, "zeroed end of block");
- err = 0;
if (ext4_should_journal_data(inode)) {
err = ext4_handle_dirty_metadata(handle, inode, bh);
} else {
+ err = 0;
mark_buffer_dirty(bh);
if (ext4_test_inode_state(inode, EXT4_STATE_ORDERED_MODE))
err = ext4_jbd2_file_inode(handle, inode);
--
1.7.12.rc0.22.gcdd159b
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