writeback: don't call mapping_set_error on AOP_WRITEPAGE_ACTIVATE

Patch series "convert write_cache_pages() to an iterator", v8.

This is an evolution of the series Matthew Wilcox originally sent in June
2023, which has changed quite a bit since and now has a while based
iterator.


This patch (of 14):

mapping_set_error should only be called on 0 returns (which it ignores) or
a negative error code.

writepage_cb ends up being able to call writepage_cb on the magic
AOP_WRITEPAGE_ACTIVATE return value from ->writepage which means success
but the caller needs to unlock the page.  Ignore that and just call
mapping_set_error on negative errors.

(no fixes tag as this goes back more than 20 years over various renames
and refactors so I've given up chasing down the original introduction)

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Reviewed-by: Brian Foster <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: David Howells <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: "Matthew Wilcox (Oracle)" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions