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fscache: Provide a function to resize a cookie

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Provide a function to change the size of the storage attached to a cookie,
to match the size of the file being cached when it's changed by truncate or
fallocate:

	void fscache_resize_cookie(struct fscache_cookie *cookie,
				   loff_t new_size);

This acts synchronously and is expected to run under the inode lock of the
caller.

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/163819621839.215744.7895597119803515402.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906922387.143852.16394459879816147793.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967128998.1823006.10740669081985775576.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021527861.640689.3466382085497236267.stgit@warthog.procyon.org.uk/ # v4
This commit is contained in:
David Howells 2021-10-20 14:06:34 +01:00
parent 1f67e6d0b1
commit 16a96bdf92
6 changed files with 82 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/fscache-cache.h
View file

@ -64,6 +64,10 @@ struct fscache_cache_ops {
/* Withdraw an object without any cookie access counts held */
void (*withdraw_cookie)(struct fscache_cookie *cookie);
/* Change the size of a data object */
void (*resize_cookie)(struct netfs_cache_resources *cres,
loff_t new_size);
/* Invalidate an object */
bool (*invalidate_cookie)(struct fscache_cookie *cookie);

18
include/linux/fscache.h
View file

@ -163,6 +163,7 @@ extern struct fscache_cookie *__fscache_acquire_cookie(
extern void __fscache_use_cookie(struct fscache_cookie *, bool);
extern void __fscache_unuse_cookie(struct fscache_cookie *, const void *, const loff_t *);
extern void __fscache_relinquish_cookie(struct fscache_cookie *, bool);
extern void __fscache_resize_cookie(struct fscache_cookie *, loff_t);
extern void __fscache_invalidate(struct fscache_cookie *, const void *, loff_t, unsigned int);
extern int __fscache_begin_read_operation(struct netfs_cache_resources *, struct fscache_cookie *);
@ -366,6 +367,23 @@ void fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data,
__fscache_update_cookie(cookie, aux_data, object_size);
}
/**
* fscache_resize_cookie - Request that a cache object be resized
* @cookie: The cookie representing the cache object
* @new_size: The new size of the object (may be NULL)
*
* Request that the size of an object be changed.
*
* See Documentation/filesystems/caching/netfs-api.txt for a complete
* description.
*/
static inline
void fscache_resize_cookie(struct fscache_cookie *cookie, loff_t new_size)
{
if (fscache_cookie_enabled(cookie))
__fscache_resize_cookie(cookie, new_size);
}
/**
* fscache_invalidate - Notify cache that an object needs invalidation
* @cookie: The cookie representing the cache object