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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

25
include/trace/events/fscache.h
View File

@@ -78,6 +78,7 @@ enum fscache_access_trace {
fscache_access_invalidate_cookie_end,
fscache_access_io_not_live,
fscache_access_io_read,
fscache_access_io_resize,
fscache_access_io_wait,
fscache_access_io_write,
fscache_access_lookup_cookie,
@@ -149,6 +150,7 @@ enum fscache_access_trace {
EM(fscache_access_invalidate_cookie_end,"END inval ") \
EM(fscache_access_io_not_live, "END io_notl") \
EM(fscache_access_io_read, "BEGIN io_read") \
EM(fscache_access_io_resize, "BEGIN io_resz") \
EM(fscache_access_io_wait, "WAIT io ") \
EM(fscache_access_io_write, "BEGIN io_writ") \
EM(fscache_access_lookup_cookie, "BEGIN lookup ") \
@@ -418,6 +420,29 @@ TRACE_EVENT(fscache_invalidate,
__entry->cookie, __entry->new_size)
);
TRACE_EVENT(fscache_resize,
TP_PROTO(struct fscache_cookie *cookie, loff_t new_size),
TP_ARGS(cookie, new_size),
TP_STRUCT__entry(
__field(unsigned int, cookie )
__field(loff_t, old_size )
__field(loff_t, new_size )
),
TP_fast_assign(
__entry->cookie = cookie->debug_id;
__entry->old_size = cookie->object_size;
__entry->new_size = new_size;
),
TP_printk("c=%08x os=%08llx sz=%08llx",
__entry->cookie,
__entry->old_size,
__entry->new_size)
);
#endif /* _TRACE_FSCACHE_H */
/* This part must be outside protection */