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ext4: support large block size in ext4_block_write_begin()

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Use the EXT4_PG_TO_LBLK() macro to convert folio indexes to blocks to avoid
negative left shifts after supporting blocksize greater than PAGE_SIZE.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-18-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Baokun Li 2025-11-21 17:06:47 +08:00 committed by Theodore Ts'o
parent a6d73242b8
commit bff6235d62
1 changed files with 3 additions and 4 deletions
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7
fs/ext4/inode.c
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@ -1170,8 +1170,7 @@ int ext4_block_write_begin(handle_t *handle, struct folio *folio,
unsigned block_start, block_end;
sector_t block;
int err = 0;
unsigned blocksize = inode->i_sb->s_blocksize;
unsigned bbits;
unsigned int blocksize = i_blocksize(inode);
struct buffer_head *bh, *head, *wait[2];
int nr_wait = 0;
int i;
@ -1180,12 +1179,12 @@ int ext4_block_write_begin(handle_t *handle, struct folio *folio,
BUG_ON(!folio_test_locked(folio));
BUG_ON(to > folio_size(folio));
BUG_ON(from > to);
WARN_ON_ONCE(blocksize > folio_size(folio));
head = folio_buffers(folio);
if (!head)
head = create_empty_buffers(folio, blocksize, 0);
bbits = ilog2(blocksize);
block = (sector_t)folio->index << (PAGE_SHIFT - bbits);
block = EXT4_PG_TO_LBLK(inode, folio->index);
for (bh = head, block_start = 0; bh != head || !block_start;
block++, block_start = block_end, bh = bh->b_this_page) {