Commit 29f18e79 authored by David Howells's avatar David Howells
Browse files

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



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

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Reviewed-by: default avatarJeff 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
parent bfa22da3

fs/fscache/cache.c

+20 −0
Original line number Diff line number Diff line
@@ -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

include/linux/fscache-cache.h

+2 −0
Original line number Diff line number Diff line
@@ -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);