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fscache: Add a function for a cache backend to note an I/O error

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Add a function to the backend API to note an I/O error in a cache.

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/163819598741.215744.891281275151382095.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906901316.143852.15225412215771586528.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967100721.1823006.16435671567428949398.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021508840.640689.11902836226570620424.stgit@warthog.procyon.org.uk/ # v4
This commit is contained in:
David Howells 2021-10-20 15:00:26 +01:00
parent bfa22da3ed
commit 29f18e79fe
2 changed files with 22 additions and 0 deletions
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20
fs/fscache/cache.c
View File

@ -321,6 +321,26 @@ void fscache_end_cache_access(struct fscache_cache *cache, enum fscache_access_t
wake_up_var(&cache->n_accesses);
}
/**
* fscache_io_error - Note a cache I/O error
* @cache: The record describing the cache
*
* Note that an I/O error occurred in a cache and that it should no longer be
* used for anything. This also reports the error into the kernel log.
*
* See Documentation/filesystems/caching/backend-api.rst for a complete
* description.
*/
void fscache_io_error(struct fscache_cache *cache)
{
if (fscache_set_cache_state_maybe(cache,
FSCACHE_CACHE_IS_ACTIVE,
FSCACHE_CACHE_GOT_IOERROR))
pr_err("Cache '%s' stopped due to I/O error\n",
cache->name);
}
EXPORT_SYMBOL(fscache_io_error);
/**
* fscache_withdraw_cache - Withdraw a cache from the active service
* @cache: The cache cookie

2
include/linux/fscache-cache.h
View File

@ -73,6 +73,8 @@ extern int fscache_add_cache(struct fscache_cache *cache,
extern void fscache_withdraw_cache(struct fscache_cache *cache);
extern void fscache_withdraw_volume(struct fscache_volume *volume);
extern void fscache_io_error(struct fscache_cache *cache);
extern void fscache_end_volume_access(struct fscache_volume *volume,
struct fscache_cookie *cookie,
enum fscache_access_trace why);