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authorDan Magenheimer <dan.magenheimer@oracle.com>2011-05-26 18:01:19 +0200
committerDan Magenheimer <dan.magenheimer@oracle.com>2011-05-26 18:01:19 +0200
commit9fdfdcf17151e8326c4d18cc133abc6e58f47568 (patch)
tree585277f9a112ccf0c7527d4c302f17d3c852814b
parentmm/fs: cleancache documentation (diff)
downloadlinux-9fdfdcf17151e8326c4d18cc133abc6e58f47568.tar.xz
linux-9fdfdcf17151e8326c4d18cc133abc6e58f47568.zip
fs: add field to superblock to support cleancache
This second patch of eight in this cleancache series adds a field to the generic superblock to squirrel away a pool identifier that is dynamically provided by cleancache-enabled filesystems at mount time to uniquely identify files and pages belonging to this mounted filesystem. Details and a FAQ can be found in Documentation/vm/cleancache.txt [v8: trivial merge conflict update] Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com> Reviewed-by: Jeremy Fitzhardinge <jeremy@goop.org> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Matthew Wilcox <matthew@wil.cx> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Rik Van Riel <riel@redhat.com> Cc: Jan Beulich <JBeulich@novell.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Andreas Dilger <adilger@sun.com> Cc: Ted Ts'o <tytso@mit.edu> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <joel.becker@oracle.com> Cc: Nitin Gupta <ngupta@vflare.org>
-rw-r--r--include/linux/fs.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index cdf9495df204..0169ed3f106e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1429,6 +1429,11 @@ struct super_block {
*/
char __rcu *s_options;
const struct dentry_operations *s_d_op; /* default d_op for dentries */
+
+ /*
+ * Saved pool identifier for cleancache (-1 means none)
+ */
+ int cleancache_poolid;
};
extern struct timespec current_fs_time(struct super_block *sb);