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authorJosef "Jeff" Sipek <jsipek@cs.sunysb.edu>2006-12-08 02:36:31 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-08 08:28:40 -0800
commit42cf11939becc717bd125d121a1a23415106a099 (patch)
treed9c0c66e3f01287fd7da6315c1a4df7c3fd9d05b /fs/stack.c
parent17b3cff079721bbc45e9d6de2fa3edb73561e27d (diff)
downloadvexpress-lsk-42cf11939becc717bd125d121a1a23415106a099.tar.gz
[PATCH] fsstack: Introduce fsstack_copy_{attr,inode}_*
Introduce several fsstack_copy_* functions which allow stackable filesystems (such as eCryptfs and Unionfs) to easily copy over (currently only) inode attributes. This prevents code duplication and allows for code reuse. [akpm@osdl.org: Remove unneeded wrapper] [bunk@stusta.de: fs/stack.c should #include <linux/fs_stack.h>] Signed-off-by: Josef "Jeff" Sipek <jsipek@cs.sunysb.edu> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/stack.c')
-rw-r--r--fs/stack.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/fs/stack.c b/fs/stack.c
new file mode 100644
index 00000000000..5ddbc34535f
--- /dev/null
+++ b/fs/stack.c
@@ -0,0 +1,40 @@
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/fs_stack.h>
+
+/* does _NOT_ require i_mutex to be held.
+ *
+ * This function cannot be inlined since i_size_{read,write} is rather
+ * heavy-weight on 32-bit systems
+ */
+void fsstack_copy_inode_size(struct inode *dst, const struct inode *src)
+{
+ i_size_write(dst, i_size_read((struct inode *)src));
+ dst->i_blocks = src->i_blocks;
+}
+EXPORT_SYMBOL_GPL(fsstack_copy_inode_size);
+
+/* copy all attributes; get_nlinks is optional way to override the i_nlink
+ * copying
+ */
+void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
+ int (*get_nlinks)(struct inode *))
+{
+ if (!get_nlinks)
+ dest->i_nlink = src->i_nlink;
+ else
+ dest->i_nlink = (*get_nlinks)(dest);
+
+ dest->i_mode = src->i_mode;
+ dest->i_uid = src->i_uid;
+ dest->i_gid = src->i_gid;
+ dest->i_rdev = src->i_rdev;
+ dest->i_atime = src->i_atime;
+ dest->i_mtime = src->i_mtime;
+ dest->i_ctime = src->i_ctime;
+ dest->i_blkbits = src->i_blkbits;
+ dest->i_flags = src->i_flags;
+
+ fsstack_copy_inode_size(dest, src);
+}
+EXPORT_SYMBOL_GPL(fsstack_copy_attr_all);