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authorAndreas Gruenbacher <agruenba@redhat.com>2021-07-12 13:40:38 +0200
committerAndreas Gruenbacher <agruenba@redhat.com>2021-10-25 08:42:14 +0200
commitb01b2d72da25c000aeb124bc78daf3fb998be2b6 (patch)
tree03b35cd01f2837299ab4856fc88cdb3ef5e8b05a /fs/zonefs
parent3337ab08d08b1a375f88471d9c8b1cac968cb054 (diff)
downloadlinux-b01b2d72da25c000aeb124bc78daf3fb998be2b6.tar.bz2
gfs2: Fix mmap + page fault deadlocks for direct I/O
Also disable page faults during direct I/O requests and implement a similar kind of retry logic as in the buffered I/O case. The retry logic in the direct I/O case differs from the buffered I/O case in the following way: direct I/O doesn't provide the kinds of consistency guarantees between concurrent reads and writes that buffered I/O provides, so once we lose the inode glock while faulting in user pages, we always resume the operation. We never need to return a partial read or write. This locking problem was originally reported by Jan Kara. Linus came up with the idea of disabling page faults. Many thanks to Al Viro and Matthew Wilcox for their feedback. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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