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Subject[PATCH 02/10] ext4: ext4_block_truncate_page() returns zeroed length on success
Date
From: Zhang Yi <yi.zhang@huawei.com>

Return the actual zeroed length instead of 0 on success. This prepares
for the upcoming iomap buffered I/O conversion by exposing zeroed length
information to callers.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
fs/ext4/inode.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1e037a314dab..a737ce05e768 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4136,6 +4136,7 @@ static int ext4_block_zero_page_range(handle_t *handle,
* up to the end of the block which corresponds to `from'.
* This required during truncate. We need to physically zero the tail end
* of that block so it doesn't yield old data if the file is later grown.
+ * Return the zeroed length on success.
*/
static int ext4_block_truncate_page(handle_t *handle,
struct address_space *mapping, loff_t from)
@@ -4143,6 +4144,8 @@ static int ext4_block_truncate_page(handle_t *handle,
unsigned length;
unsigned blocksize;
struct inode *inode = mapping->host;
+ bool did_zero = false;
+ int err;

/* If we are processing an encrypted inode during orphan list handling */
if (IS_ENCRYPTED(inode) && !fscrypt_has_encryption_key(inode))
@@ -4151,7 +4154,12 @@ static int ext4_block_truncate_page(handle_t *handle,
blocksize = i_blocksize(inode);
length = blocksize - (from & (blocksize - 1));

- return ext4_block_zero_page_range(handle, mapping, from, length, NULL);
+ err = ext4_block_zero_page_range(handle, mapping, from, length,
+ &did_zero);
+ if (err)
+ return err;
+
+ return did_zero ? length : 0;
}

int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
--
2.52.0

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