Gitweb: http://git.kernel.org/linus/f44d3e7857e5d21413fc9a2b61948190c73705e7
Commit: f44d3e7857e5d21413fc9a2b61948190c73705e7
Parent: d3a3b0adad0865c12e39b712ca89efbd0a3a0dbc
Author: Eric W. Biederman <ebiederm@maxwell.aristanetworks.com>
AuthorDate: Sat Nov 7 23:26:59 2009 -0800
Committer: Greg Kroah-Hartman <gregkh@suse.de>
CommitDate: Fri Dec 11 11:24:53 2009 -0800
sysfs: Update sysfs_setxattr so it updates secdata under the sysfs_mutex
The sysfs_mutex is required to ensure updates are and will remain
atomic with respect to other inode iattr updates, that do not happen
through the filesystem.
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
fs/sysfs/inode.c | 41 +++++++++++++++++++++++++++++------------
1 files changed, 29 insertions(+), 12 deletions(-)
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index e144351..000bd98 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -123,23 +123,39 @@ int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
return error;
}
+static int sysfs_sd_setsecdata(struct sysfs_dirent *sd, void **secdata, u32 *secdata_len)
+{
+ struct sysfs_inode_attrs *iattrs;
+ void *old_secdata;
+ size_t old_secdata_len;
+
+ iattrs = sd->s_iattr;
+ if (!iattrs)
+ iattrs = sysfs_init_inode_attrs(sd);
+ if (!iattrs)
+ return -ENOMEM;
+
+ old_secdata = iattrs->ia_secdata;
+ old_secdata_len = iattrs->ia_secdata_len;
+
+ iattrs->ia_secdata = *secdata;
+ iattrs->ia_secdata_len = *secdata_len;
+
+ *secdata = old_secdata;
+ *secdata_len = old_secdata_len;
+ return 0;
+}
+
int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
size_t size, int flags)
{
struct sysfs_dirent *sd = dentry->d_fsdata;
- struct sysfs_inode_attrs *iattrs;
void *secdata;
int error;
u32 secdata_len = ...
