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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-08 21:37:18 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-08 21:37:18 -0700 |
| commit | 9744b923d50810bb489e49bfe89d0b4d5c84be31 (patch) | |
| tree | 9a4efde432191ca3a4faf0a53984b7f93d84213d /fs | |
| parent | d8fc9cde85d829eed6ca050d86799cc4cfa6a048 (diff) | |
| parent | 457df33e035a2cffc6561992f3f25a6c61605c46 (diff) | |
| download | linux-9744b923d50810bb489e49bfe89d0b4d5c84be31.tar.bz2 | |
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')
| -rw-r--r-- | fs/iomap/buffered-io.c | 8 |
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; |