reiserfs: switch to generic_{get,set,remove}xattr()

reiserfs_xattr_[sg]et() will fail with -EOPNOTSUPP for V1 inodes anyway,
and all reiserfs instances of ->[sg]et() call it and so does ->set_acl().

Checks for name length in the instances had been bogus; they should've
been "bugger off if it's _exactly_ the prefix" (as generic would
do on its own) and not "bugger off if it's shorter than the prefix" -
that can't happen.

xattr_full_name() is needed to adjust for the fact that generic instances
will skip the prefix in the name passed to ->[gs]et(); reiserfs homegrown
analogues didn't.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

7 files changed, 31 insertions, 98 deletions

diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index 9424a4ba93a9..9ffaf7145644 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -260,10 +260,10 @@ const struct file_operations reiserfs_file_operations = {
 
 const struct inode_operations reiserfs_file_inode_operations = {
         .setattr = reiserfs_setattr,
-        .setxattr = reiserfs_setxattr,
-        .getxattr = reiserfs_getxattr,
+        .setxattr = generic_setxattr,
+        .getxattr = generic_getxattr,
         .listxattr = reiserfs_listxattr,
-        .removexattr = reiserfs_removexattr,
+        .removexattr = generic_removexattr,
         .permission = reiserfs_permission,
         .get_acl = reiserfs_get_acl,
         .set_acl = reiserfs_set_acl,
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index 2a12d46d7fb4..8a36696d6df9 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -1650,10 +1650,10 @@ const struct inode_operations reiserfs_dir_inode_operations = {
         .mknod = reiserfs_mknod,
         .rename = reiserfs_rename,
         .setattr = reiserfs_setattr,
-        .setxattr = reiserfs_setxattr,
-        .getxattr = reiserfs_getxattr,
+        .setxattr = generic_setxattr,
+        .getxattr = generic_getxattr,
         .listxattr = reiserfs_listxattr,
-        .removexattr = reiserfs_removexattr,
+        .removexattr = generic_removexattr,
         .permission = reiserfs_permission,
         .get_acl = reiserfs_get_acl,
         .set_acl = reiserfs_set_acl,
@@ -1667,10 +1667,10 @@ const struct inode_operations reiserfs_symlink_inode_operations = {
         .readlink = generic_readlink,
         .get_link       = page_get_link,
         .setattr = reiserfs_setattr,
-        .setxattr = reiserfs_setxattr,
-        .getxattr = reiserfs_getxattr,
+        .setxattr = generic_setxattr,
+        .getxattr = generic_getxattr,
         .listxattr = reiserfs_listxattr,
-        .removexattr = reiserfs_removexattr,
+        .removexattr = generic_removexattr,
         .permission = reiserfs_permission,
 };
 
@@ -1679,10 +1679,10 @@ const struct inode_operations reiserfs_symlink_inode_operations = {
  */
 const struct inode_operations reiserfs_special_inode_operations = {
         .setattr = reiserfs_setattr,
-        .setxattr = reiserfs_setxattr,
-        .getxattr = reiserfs_getxattr,
+        .setxattr = generic_setxattr,
+        .getxattr = generic_getxattr,
         .listxattr = reiserfs_listxattr,
-        .removexattr = reiserfs_removexattr,
+        .removexattr = generic_removexattr,
         .permission = reiserfs_permission,
         .get_acl = reiserfs_get_acl,
         .set_acl = reiserfs_set_acl,
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 57e0b2310532..02137bbda0ec 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -764,60 +764,6 @@ find_xattr_handler_prefix(const struct xattr_handler **handlers,
         return xah;
 }
 
-
-/*
- * Inode operation getxattr()
- */
-ssize_t
-reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
-                  size_t size)
-{
-        const struct xattr_handler *handler;
-
-        handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
-
-        if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
-                return -EOPNOTSUPP;
-
-        return handler->get(handler, dentry, name, buffer, size);
-}
-
-/*
- * Inode operation setxattr()
- *
- * d_inode(dentry)->i_mutex down
- */
-int
-reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
-                  size_t size, int flags)
-{
-        const struct xattr_handler *handler;
-
-        handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
-
-        if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
-                return -EOPNOTSUPP;
-
-        return handler->set(handler, dentry, name, value, size, flags);
-}
-
-/*
- * Inode operation removexattr()
- *
- * d_inode(dentry)->i_mutex down
- */
-int reiserfs_removexattr(struct dentry *dentry, const char *name)
-{
-        const struct xattr_handler *handler;
-
-        handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
-
-        if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
-                return -EOPNOTSUPP;
-
-        return handler->set(handler, dentry, name, NULL, 0, XATTR_REPLACE);
-}
-
 struct listxattr_buf {
         struct dir_context ctx;
         size_t size;
diff --git a/fs/reiserfs/xattr.h b/fs/reiserfs/xattr.h
index 15dde6262c00..613ff5aef94e 100644
--- a/fs/reiserfs/xattr.h
+++ b/fs/reiserfs/xattr.h
@@ -2,6 +2,7 @@
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/rwsem.h>
+#include <linux/xattr.h>
 
 struct inode;
 struct dentry;
@@ -18,12 +19,7 @@ int reiserfs_permission(struct inode *inode, int mask);
 
 #ifdef CONFIG_REISERFS_FS_XATTR
 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
-ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
-                          void *buffer, size_t size);
-int reiserfs_setxattr(struct dentry *dentry, const char *name,
-                      const void *value, size_t size, int flags);
 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
-int reiserfs_removexattr(struct dentry *dentry, const char *name);
 
 int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
@@ -92,10 +88,7 @@ static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 
 #else
 
-#define reiserfs_getxattr NULL
-#define reiserfs_setxattr NULL
 #define reiserfs_listxattr NULL
-#define reiserfs_removexattr NULL
 
 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 {
diff --git a/fs/reiserfs/xattr_security.c b/fs/reiserfs/xattr_security.c
index ab0217d32039..ac7e104ada6b 100644
--- a/fs/reiserfs/xattr_security.c
+++ b/fs/reiserfs/xattr_security.c
@@ -12,26 +12,24 @@ static int
 security_get(const struct xattr_handler *handler, struct dentry *dentry,
              const char *name, void *buffer, size_t size)
 {
-        if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
-                return -EINVAL;
-
         if (IS_PRIVATE(d_inode(dentry)))
                 return -EPERM;
 
-        return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
+        return reiserfs_xattr_get(d_inode(dentry),
+                                  xattr_full_name(handler, name),
+                                  buffer, size);
 }
 
 static int
 security_set(const struct xattr_handler *handler, struct dentry *dentry,
              const char *name, const void *buffer, size_t size, int flags)
 {
-        if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
-                return -EINVAL;
-
         if (IS_PRIVATE(d_inode(dentry)))
                 return -EPERM;
 
-        return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
+        return reiserfs_xattr_set(d_inode(dentry),
+                                  xattr_full_name(handler, name),
+                                  buffer, size, flags);
 }
 
 static bool security_list(struct dentry *dentry)
diff --git a/fs/reiserfs/xattr_trusted.c b/fs/reiserfs/xattr_trusted.c
index 64b67aa643a9..cc248a581b60 100644
--- a/fs/reiserfs/xattr_trusted.c
+++ b/fs/reiserfs/xattr_trusted.c
@@ -11,26 +11,24 @@ static int
 trusted_get(const struct xattr_handler *handler, struct dentry *dentry,
             const char *name, void *buffer, size_t size)
 {
-        if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
-                return -EINVAL;
-
         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
                 return -EPERM;
 
-        return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
+        return reiserfs_xattr_get(d_inode(dentry),
+                                  xattr_full_name(handler, name),
+                                  buffer, size);
 }
 
 static int
 trusted_set(const struct xattr_handler *handler, struct dentry *dentry,
             const char *name, const void *buffer, size_t size, int flags)
 {
-        if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
-                return -EINVAL;
-
         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
                 return -EPERM;
 
-        return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
+        return reiserfs_xattr_set(d_inode(dentry),
+                                  xattr_full_name(handler, name),
+                                  buffer, size, flags);
 }
 
 static bool trusted_list(struct dentry *dentry)
diff --git a/fs/reiserfs/xattr_user.c b/fs/reiserfs/xattr_user.c
index 12e6306f562a..caad583086af 100644
--- a/fs/reiserfs/xattr_user.c
+++ b/fs/reiserfs/xattr_user.c
@@ -10,24 +10,22 @@ static int
 user_get(const struct xattr_handler *handler, struct dentry *dentry,
          const char *name, void *buffer, size_t size)
 {
-
-        if (strlen(name) < sizeof(XATTR_USER_PREFIX))
-                return -EINVAL;
         if (!reiserfs_xattrs_user(dentry->d_sb))
                 return -EOPNOTSUPP;
-        return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
+        return reiserfs_xattr_get(d_inode(dentry),
+                                  xattr_full_name(handler, name),
+                                  buffer, size);
 }
 
 static int
 user_set(const struct xattr_handler *handler, struct dentry *dentry,
          const char *name, const void *buffer, size_t size, int flags)
 {
-        if (strlen(name) < sizeof(XATTR_USER_PREFIX))
-                return -EINVAL;
-
         if (!reiserfs_xattrs_user(dentry->d_sb))
                 return -EOPNOTSUPP;
-        return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
+        return reiserfs_xattr_set(d_inode(dentry),
+                                  xattr_full_name(handler, name),
+                                  buffer, size, flags);
 }
 
 static bool user_list(struct dentry *dentry)