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authorJoel Stanley <joel@jms.id.au>2021-03-30 16:45:37 +0300
committerRichard Weinberger <richard@nod.at>2021-04-15 23:01:14 +0300
commit42984af09afc414d540fcc8247f42894b0378a91 (patch)
tree2ccbce216b354bba6a350633c61b41d0a834ba90 /fs/jffs2
parent81af4b7b53d3f2931db907c90822d0b89f0166b7 (diff)
downloadlinux-42984af09afc414d540fcc8247f42894b0378a91.tar.xz
jffs2: Hook up splice_write callback
overlayfs using jffs2 as the upper filesystem would fail in some cases since moving to v5.10. The test case used was to run 'touch' on a file that exists in the lower fs, causing the modification time to be updated. It returns EINVAL when the bug is triggered. A bisection showed this was introduced in v5.9-rc1, with commit 36e2c7421f02 ("fs: don't allow splice read/write without explicit ops"). Reverting that commit restores the expected behaviour. Some digging showed that this was due to jffs2 lacking an implementation of splice_write. (For unknown reasons the warn_unsupported that should trigger was not displaying any output). Adding this patch resolved the issue and the test now passes. Cc: stable@vger.kernel.org Fixes: 36e2c7421f02 ("fs: don't allow splice read/write without explicit ops") Signed-off-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Christoph Hellwig <hch@lst.de> Tested-by: Lei YU <yulei.sh@bytedance.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/jffs2')
-rw-r--r--fs/jffs2/file.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c
index f8fb89b10227..4fc8cd698d1a 100644
--- a/fs/jffs2/file.c
+++ b/fs/jffs2/file.c
@@ -57,6 +57,7 @@ const struct file_operations jffs2_file_operations =
.mmap = generic_file_readonly_mmap,
.fsync = jffs2_fsync,
.splice_read = generic_file_splice_read,
+ .splice_write = iter_file_splice_write,
};
/* jffs2_file_inode_operations */