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radix-tree,shmem: introduce radix_tree_iter_next()

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shmem likes to occasionally drop the lock, schedule, then reacqire the
lock and continue with the iteration from the last place it left off.
This is currently done with a pretty ugly goto.  Introduce
radix_tree_iter_next() and use it throughout shmem.c.

[koct9i@gmail.com: fix bug in radix_tree_iter_next() for tagged iteration]
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox
2016-03-17 14:22:06 -07:00
committed by Linus Torvalds
parent 2cf938aae1
commit 7165092fe5
2 changed files with 19 additions and 9 deletions
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16
include/linux/radix-tree.h
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@@ -402,6 +402,22 @@ void **radix_tree_iter_retry(struct radix_tree_iter *iter)
return NULL;
}
/**
* radix_tree_iter_next - resume iterating when the chunk may be invalid
* @iter: iterator state
*
* If the iterator needs to release then reacquire a lock, the chunk may
* have been invalidated by an insertion or deletion. Call this function
* to continue the iteration from the next index.
*/
static inline __must_check
void **radix_tree_iter_next(struct radix_tree_iter *iter)
{
iter->next_index = iter->index + 1;
iter->tags = 0;
return NULL;
}
/**
* radix_tree_chunk_size - get current chunk size
*