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fs/affs: bugfix: enable writes on OFS disks

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We called unconditionally affs_bread_ino() with create 0 resulting in
"error (device ...): get_block(): strange block request 0"
when trying to write on AFFS OFS format.

This patch adds create parameter to that function.
0 for affs_readpage_ofs()
1 for affs_write_begin_ofs()

Bug was found here:
https://bugzilla.kernel.org/show_bug.cgi?id=114961

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Fabian Frederick 2017-04-24 22:12:57 +02:00 committed by Al Viro
parent a9d6cfb70f
commit 077e073e8f
1 changed files with 4 additions and 4 deletions
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8
fs/affs/file.c
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@ -499,7 +499,7 @@ affs_getemptyblk_ino(struct inode *inode, int block)
}
static int
affs_do_readpage_ofs(struct page *page, unsigned to)
affs_do_readpage_ofs(struct page *page, unsigned to, int create)
{
struct inode *inode = page->mapping->host;
struct super_block *sb = inode->i_sb;
@ -518,7 +518,7 @@ affs_do_readpage_ofs(struct page *page, unsigned to)
boff = tmp % bsize;
while (pos < to) {
bh = affs_bread_ino(inode, bidx, 0);
bh = affs_bread_ino(inode, bidx, create);
if (IS_ERR(bh))
return PTR_ERR(bh);
tmp = min(bsize - boff, to - pos);
@ -620,7 +620,7 @@ affs_readpage_ofs(struct file *file, struct page *page)
memset(page_address(page) + to, 0, PAGE_SIZE - to);
}
err = affs_do_readpage_ofs(page, to);
err = affs_do_readpage_ofs(page, to, 0);
if (!err)
SetPageUptodate(page);
unlock_page(page);
@ -657,7 +657,7 @@ static int affs_write_begin_ofs(struct file *file, struct address_space *mapping
return 0;
/* XXX: inefficient but safe in the face of short writes */
err = affs_do_readpage_ofs(page, PAGE_SIZE);
err = affs_do_readpage_ofs(page, PAGE_SIZE, 1);
if (err) {
unlock_page(page);
put_page(page);