Messages in this thread Patch in this message | | | From | Sjoerd Simons <> | Subject | [PATCH] hostfs: Fix writeback of dirty pages | Date | Fri, 5 Nov 2021 09:10:51 +0100 |
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Hostfs was not setting up the backing device information, which means it uses the noop bdi. The noop bdi does not have the writeback capability enabled, which in turns means dirty pages never got written back to storage.
In other words programs using mmap to write to files on hostfs never actually got their data written out...
Fix this by simply setting up the bdi with default settings as all the required code for writeback is already in place.
Signed-off-by: Sjoerd Simons <sjoerd@collabora.com>
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fs/hostfs/hostfs_kern.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c index d5c9d886cd9f..ef481c3d9019 100644 --- a/fs/hostfs/hostfs_kern.c +++ b/fs/hostfs/hostfs_kern.c @@ -924,6 +924,9 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) sb->s_op = &hostfs_sbops; sb->s_d_op = &simple_dentry_operations; sb->s_maxbytes = MAX_LFS_FILESIZE; + err = super_setup_bdi(sb); + if (err) + goto out; /* NULL is printed as '(null)' by printf(): avoid that. */ if (req_root == NULL) -- 2.33.1
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