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authorAl Viro <viro@zeniv.linux.org.uk>2016-05-13 04:59:17 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2016-05-13 05:28:05 +0300
commit1a39ba99b5d533647c5dac45cd6a3e0baa7cb66a (patch)
tree24f0508c7d380168e333f9ee8921d8b8550f9ef6 /fs/gfs2/xattr.c
parentb971e94e8f4c09ff775cfb2c4f846b4431a00598 (diff)
downloadlinux-1a39ba99b5d533647c5dac45cd6a3e0baa7cb66a.tar.xz
gfs2: Switch to generic xattr handlers
Switch to the generic xattr handlers and take the necessary glocks at the layer below. The following are the new xattr "entry points"; they are called with the glock held already in the following cases: gfs2_xattr_get: From SELinux, during lookups. gfs2_xattr_set: The glock is never held. gfs2_get_acl: From gfs2_create_inode -> posix_acl_create and gfs2_setattr -> posix_acl_chmod. gfs2_set_acl: From gfs2_setattr -> posix_acl_chmod. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/gfs2/xattr.c')
-rw-r--r--fs/gfs2/xattr.c46
1 files changed, 40 insertions, 6 deletions
diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index 619886ba6e78..f42ab53bd30d 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -583,13 +583,11 @@ out:
*
* Returns: actual size of data on success, -errno on error
*/
-static int gfs2_xattr_get(const struct xattr_handler *handler,
- struct dentry *unused, struct inode *inode,
- const char *name, void *buffer, size_t size)
+static int __gfs2_xattr_get(struct inode *inode, const char *name,
+ void *buffer, size_t size, int type)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_ea_location el;
- int type = handler->flags;
int error;
if (!ip->i_eattr)
@@ -611,6 +609,29 @@ static int gfs2_xattr_get(const struct xattr_handler *handler,
return error;
}
+static int gfs2_xattr_get(const struct xattr_handler *handler,
+ struct dentry *unused, struct inode *inode,
+ const char *name, void *buffer, size_t size)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ bool need_unlock = false;
+ int ret;
+
+ /* During lookup, SELinux calls this function with the glock locked. */
+
+ if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
+ ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+ if (ret)
+ return ret;
+ need_unlock = true;
+ }
+ ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
+ if (need_unlock)
+ gfs2_glock_dq_uninit(&gh);
+ return ret;
+}
+
/**
* ea_alloc_blk - allocates a new block for extended attributes.
* @ip: A pointer to the inode that's getting extended attributes
@@ -1233,8 +1254,21 @@ static int gfs2_xattr_set(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
- return __gfs2_xattr_set(d_inode(dentry), name, value,
- size, flags, handler->flags);
+ struct inode *inode = d_inode(dentry);
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ int ret;
+
+ ret = gfs2_rsqa_alloc(ip);
+ if (ret)
+ return ret;
+
+ ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+ if (ret)
+ return ret;
+ ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
+ gfs2_glock_dq_uninit(&gh);
+ return ret;
}
static int ea_dealloc_indirect(struct gfs2_inode *ip)