ext4: trim allocation requests to group size

[mirror_ubuntu-zesty-kernel.git] / fs / ext4 / xattr.h

diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index a92e783fa057070a2d46ece41089bae6e3a26fe4..099c8b670ef56e2a4ab85266b4c0f112edaa48b9 100644 (file)
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -102,6 +102,38 @@ extern const struct xattr_handler ext4_xattr_security_handler;
 
 #define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c"
 
+/*
+ * The EXT4_STATE_NO_EXPAND is overloaded and used for two purposes.
+ * The first is to signal that there the inline xattrs and data are
+ * taking up so much space that we might as well not keep trying to
+ * expand it.  The second is that xattr_sem is taken for writing, so
+ * we shouldn't try to recurse into the inode expansion.  For this
+ * second case, we need to make sure that we take save and restore the
+ * NO_EXPAND state flag appropriately.
+ */
+static inline void ext4_write_lock_xattr(struct inode *inode, int *save)
+{
+       down_write(&EXT4_I(inode)->xattr_sem);
+       *save = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND);
+       ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND);
+}
+
+static inline int ext4_write_trylock_xattr(struct inode *inode, int *save)
+{
+       if (down_write_trylock(&EXT4_I(inode)->xattr_sem) == 0)
+               return 0;
+       *save = ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND);
+       ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND);
+       return 1;
+}
+
+static inline void ext4_write_unlock_xattr(struct inode *inode, int *save)
+{
+       if (*save == 0)
+               ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND);
+       up_write(&EXT4_I(inode)->xattr_sem);
+}
+
 extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
 
 extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);