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netfslib, cachefiles and afs fixes

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Merge tag 'misc-fixes-20211007' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull netfslib, cachefiles and afs fixes from David Howells:

 - Fix another couple of oopses in cachefiles tracing stemming from the
   possibility of passing in a NULL object pointer

 - Fix netfs_clear_unread() to set READ on the iov_iter so that source
   it is passed to doesn't do the wrong thing (some drivers look at the
   flag on iov_iter rather than other available information to determine
   the direction)

 - Fix afs_launder_page() to write back at the correct file position on
   the server so as not to corrupt data

* tag 'misc-fixes-20211007' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Fix afs_launder_page() to set correct start file position
  netfs: Fix READ/WRITE confusion when calling iov_iter_xarray()
  cachefiles: Fix oops with cachefiles_cull() due to NULL object
This commit is contained in:
Linus Torvalds 2021-10-07 11:20:08 -07:00
commit 7041503d3a
3 changed files with 4 additions and 5 deletions
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3
fs/afs/write.c
View File

@ -974,8 +974,7 @@ int afs_launder_page(struct page *page)
iov_iter_bvec(&iter, WRITE, bv, 1, bv[0].bv_len);
trace_afs_page_dirty(vnode, tracepoint_string("launder"), page);
ret = afs_store_data(vnode, &iter, (loff_t)page->index * PAGE_SIZE,
true);
ret = afs_store_data(vnode, &iter, page_offset(page) + f, true);
}
trace_afs_page_dirty(vnode, tracepoint_string("laundered"), page);

2
fs/netfs/read_helper.c
View File

@ -150,7 +150,7 @@ static void netfs_clear_unread(struct netfs_read_subrequest *subreq)
{
struct iov_iter iter;
iov_iter_xarray(&iter, WRITE, &subreq->rreq->mapping->i_pages,
iov_iter_xarray(&iter, READ, &subreq->rreq->mapping->i_pages,
subreq->start + subreq->transferred,
subreq->len - subreq->transferred);
iov_iter_zero(iov_iter_count(&iter), &iter);

4
include/trace/events/cachefiles.h
View File

@ -178,7 +178,7 @@ TRACE_EVENT(cachefiles_unlink,
),
TP_fast_assign(
__entry->obj = obj->fscache.debug_id;
__entry->obj = obj ? obj->fscache.debug_id : UINT_MAX;
__entry->de = de;
__entry->why = why;
),
@ -205,7 +205,7 @@ TRACE_EVENT(cachefiles_rename,
),
TP_fast_assign(
__entry->obj = obj->fscache.debug_id;
__entry->obj = obj ? obj->fscache.debug_id : UINT_MAX;
__entry->de = de;
__entry->to = to;
__entry->why = why;