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authorDavid Howells <dhowells@redhat.com>2021-09-14 09:47:45 +0100
committerDavid Howells <dhowells@redhat.com>2022-01-07 09:22:19 +0000
commit3a11b3a86366ccbf0818b088ffecadf8b2d61177 (patch)
treefa50fc236e1872716dd6a31c48c3f7611fea983a /fs/fscache
parented1235eb78a7421cd0ac2ad09e931f8f07ccdc7c (diff)
netfs: Pass more information on how to deal with a hole in the cache
Pass more information to the cache on how to deal with a hole if it encounters one when trying to read from the cache. Three options are provided: (1) NETFS_READ_HOLE_IGNORE. Read the hole along with the data, assuming it to be a punched-out extent by the backing filesystem. (2) NETFS_READ_HOLE_CLEAR. If there's a hole, erase the requested region of the cache and clear the read buffer. (3) NETFS_READ_HOLE_FAIL. Fail the read if a hole is detected. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/163819612321.215744.9738308885948264476.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/163906914460.143852.6284247083607910189.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163967119923.1823006.15637375885194297582.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/164021519762.640689.16994364383313159319.stgit@warthog.procyon.org.uk/ # v4
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