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| author | David Howells <dhowells@redhat.com> | 2022-01-07 11:51:13 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2022-01-21 22:36:28 +0100 |
| commit | 14b9d0902dfa25dac9c41bf346aa655fdeafe5b2 (patch) | |
| tree | 7f7d282b76af3da8c6e8cb7d68afddb2ac8a1441 /fs/cachefiles | |
| parent | cachefiles: Trace active-mark failure (diff) | |
| download | linux-14b9d0902dfa25dac9c41bf346aa655fdeafe5b2.tar.xz linux-14b9d0902dfa25dac9c41bf346aa655fdeafe5b2.zip | |
cachefiles: Explain checks in a comment
Add a comment to explain the checks that cachefiles is making of the
backing filesystem[1].
Suggested-by: Jeff Layton <jlayton@kernel.org>
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/568749bd7cc02908ecf6f3d6a611b6f9cf5c4afd.camel@kernel.org/ [1]
Link: https://lore.kernel.org/r/164251405621.3435901.771439791811515914.stgit@warthog.procyon.org.uk/ # v1
Diffstat (limited to 'fs/cachefiles')
| -rw-r--r-- | fs/cachefiles/cache.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/cachefiles/cache.c b/fs/cachefiles/cache.c index 1e9c71666c6a..2b2879c5d1d2 100644 --- a/fs/cachefiles/cache.c +++ b/fs/cachefiles/cache.c @@ -49,7 +49,13 @@ int cachefiles_add_cache(struct cachefiles_cache *cache) goto error_unsupported; } - /* check parameters */ + /* Check features of the backing filesystem: + * - Directories must support looking up and directory creation + * - We use xattrs to store metadata + * - We need to be able to query the amount of space available + * - We want to be able to sync the filesystem when stopping the cache + * - We use DIO to/from pages, so the blocksize mustn't be too big. + */ ret = -EOPNOTSUPP; if (d_is_negative(root) || !d_backing_inode(root)->i_op->lookup || |