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ext4: add did_zero output parameter to ext4_block_zero_page_range()

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Add a bool *did_zero output parameter to ext4_block_zero_page_range()
and __ext4_block_zero_page_range(). The parameter reports whether a
partial block was zeroed out, which is needed for the upcoming iomap
buffered I/O conversion.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260327102939.1095257-2-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Zhang Yi 2026-03-27 18:29:27 +08:00 committed by Theodore Ts'o
parent 6ea3b34d86
commit 5447c8b9de
1 changed files with 14 additions and 9 deletions
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23
fs/ext4/inode.c
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@ -4033,7 +4033,8 @@ void ext4_set_aops(struct inode *inode)
* racing writeback can come later and flush the stale pagecache to disk.
*/
static int __ext4_block_zero_page_range(handle_t *handle,
struct address_space *mapping, loff_t from, loff_t length)
struct address_space *mapping, loff_t from, loff_t length,
bool *did_zero)
{
unsigned int offset, blocksize, pos;
ext4_lblk_t iblock;
@ -4121,6 +4122,8 @@ static int __ext4_block_zero_page_range(handle_t *handle,
err = ext4_jbd2_inode_add_write(handle, inode, from,
length);
}
if (!err && did_zero)
*did_zero = true;
unlock:
folio_unlock(folio);
@ -4136,7 +4139,8 @@ static int __ext4_block_zero_page_range(handle_t *handle,
* that corresponds to 'from'
*/
static int ext4_block_zero_page_range(handle_t *handle,
struct address_space *mapping, loff_t from, loff_t length)
struct address_space *mapping, loff_t from, loff_t length,
bool *did_zero)
{
struct inode *inode = mapping->host;
unsigned blocksize = inode->i_sb->s_blocksize;
@ -4150,10 +4154,11 @@ static int ext4_block_zero_page_range(handle_t *handle,
length = max;
if (IS_DAX(inode)) {
return dax_zero_range(inode, from, length, NULL,
return dax_zero_range(inode, from, length, did_zero,
&ext4_iomap_ops);
}
return __ext4_block_zero_page_range(handle, mapping, from, length);
return __ext4_block_zero_page_range(handle, mapping, from, length,
did_zero);
}
/*
@ -4176,7 +4181,7 @@ 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);
return ext4_block_zero_page_range(handle, mapping, from, length, NULL);
}
int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
@ -4199,13 +4204,13 @@ int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
if (start == end &&
(partial_start || (partial_end != sb->s_blocksize - 1))) {
err = ext4_block_zero_page_range(handle, mapping,
lstart, length);
lstart, length, NULL);
return err;
}
/* Handle partial zero out on the start of the range */
if (partial_start) {
err = ext4_block_zero_page_range(handle, mapping,
lstart, sb->s_blocksize);
err = ext4_block_zero_page_range(handle, mapping, lstart,
sb->s_blocksize, NULL);
if (err)
return err;
}
@ -4213,7 +4218,7 @@ int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
if (partial_end != sb->s_blocksize - 1)
err = ext4_block_zero_page_range(handle, mapping,
byte_end - partial_end,
partial_end + 1);
partial_end + 1, NULL);
return err;
}