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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

3
fs/fscache/internal.h
View File

@@ -122,6 +122,9 @@ extern atomic_t fscache_n_relinquishes;
extern atomic_t fscache_n_relinquishes_retire;
extern atomic_t fscache_n_relinquishes_dropped;
extern atomic_t fscache_n_resizes;
extern atomic_t fscache_n_resizes_null;
static inline void fscache_stat(atomic_t *stat)
{
atomic_inc(stat);

25
fs/fscache/io.c
View File

@@ -291,3 +291,28 @@ abandon:
term_func(term_func_priv, ret, false);
}
EXPORT_SYMBOL(__fscache_write_to_cache);
/*
* Change the size of a backing object.
*/
void __fscache_resize_cookie(struct fscache_cookie *cookie, loff_t new_size)
{
struct netfs_cache_resources cres;
trace_fscache_resize(cookie, new_size);
if (fscache_begin_operation(&cres, cookie, FSCACHE_WANT_WRITE,
fscache_access_io_resize) == 0) {
fscache_stat(&fscache_n_resizes);
set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);
/* We cannot defer a resize as we need to do it inside the
* netfs's inode lock so that we're serialised with respect to
* writes.
*/
cookie->volume->cache->ops->resize_cookie(&cres, new_size);
fscache_end_operation(&cres);
} else {
fscache_stat(&fscache_n_resizes_null);
}
}
EXPORT_SYMBOL(__fscache_resize_cookie);

9
fs/fscache/stats.c
View File

@@ -35,6 +35,9 @@ atomic_t fscache_n_relinquishes;
atomic_t fscache_n_relinquishes_retire;
atomic_t fscache_n_relinquishes_dropped;
atomic_t fscache_n_resizes;
atomic_t fscache_n_resizes_null;
atomic_t fscache_n_read;
EXPORT_SYMBOL(fscache_n_read);
atomic_t fscache_n_write;
@@ -69,8 +72,10 @@ int fscache_stats_show(struct seq_file *m, void *v)
seq_printf(m, "Invals : n=%u\n",
atomic_read(&fscache_n_invalidates));
seq_printf(m, "Updates: n=%u\n",
atomic_read(&fscache_n_updates));
seq_printf(m, "Updates: n=%u rsz=%u rsn=%u\n",
atomic_read(&fscache_n_updates),
atomic_read(&fscache_n_resizes),
atomic_read(&fscache_n_resizes_null));
seq_printf(m, "Relinqs: n=%u rtr=%u drop=%u\n",
atomic_read(&fscache_n_relinquishes),