kernfs: fix regression in kernfs_fop_write caused by wrong type

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commit ba87977a49 upstream.

Commit b7ce40cff0 ("kernfs: cache atomic_write_len in
kernfs_open_file") changes type of local variable 'len' from ssize_t
to size_t. This change caused that the *ppos value is updated also
when the previous write callback failed.

Mentioned snippet:
...
len = ops->write(...); <- return value can be negative
...
if (len > 0)           <- true here in this case
        *ppos += len;
...

Fixes: b7ce40cff0 ("kernfs: cache atomic_write_len in kernfs_open_file")
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

This commit is contained in:

Ivan Vecera 2018-01-19 09:18:54 +01:00 • committed by Ben Hutchings

parent 521f0550e6

commit 88a25f03d3

1 changed files with 1 additions and 1 deletions

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fs/kernfs/file.c

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