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authorLinus Torvalds <torvalds@linux-foundation.org>2020-04-08 21:37:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-08 21:37:18 -0700
commit9744b923d50810bb489e49bfe89d0b4d5c84be31 (patch)
tree9a4efde432191ca3a4faf0a53984b7f93d84213d /fs/iomap
parentd8fc9cde85d829eed6ca050d86799cc4cfa6a048 (diff)
parent457df33e035a2cffc6561992f3f25a6c61605c46 (diff)
Merge tag 'iomap-5.7-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull iomap fix from Darrick Wong: "Fix a problem in readahead where we can crash if we can't allocate a full bio due to GFP_NORETRY" * tag 'iomap-5.7-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: iomap: Handle memory allocation failure in readahead
Diffstat (limited to 'fs/iomap')
-rw-r--r--fs/iomap/buffered-io.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 4da51a8ce324..89e21961d1ad 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -302,6 +302,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
if (!ctx->bio || !is_contig || bio_full(ctx->bio, plen)) {
gfp_t gfp = mapping_gfp_constraint(page->mapping, GFP_KERNEL);
+ gfp_t orig_gfp = gfp;
int nr_vecs = (length + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (ctx->bio)
@@ -310,6 +311,13 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
if (ctx->is_readahead) /* same as readahead_gfp_mask */
gfp |= __GFP_NORETRY | __GFP_NOWARN;
ctx->bio = bio_alloc(gfp, min(BIO_MAX_PAGES, nr_vecs));
+ /*
+ * If the bio_alloc fails, try it again for a single page to
+ * avoid having to deal with partial page reads. This emulates
+ * what do_mpage_readpage does.
+ */
+ if (!ctx->bio)
+ ctx->bio = bio_alloc(orig_gfp, 1);
ctx->bio->bi_opf = REQ_OP_READ;
if (ctx->is_readahead)
ctx->bio->bi_opf |= REQ_RAHEAD;