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Diffstat (limited to 'fs/xfs/xfs_attr_remote.h')
-rw-r--r--fs/xfs/xfs_attr_remote.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/xfs/xfs_attr_remote.h b/fs/xfs/xfs_attr_remote.h
index c7cca60a062..92a8fd7977c 100644
--- a/fs/xfs/xfs_attr_remote.h
+++ b/fs/xfs/xfs_attr_remote.h
@@ -20,6 +20,14 @@
#define XFS_ATTR3_RMT_MAGIC 0x5841524d /* XARM */
+/*
+ * There is one of these headers per filesystem block in a remote attribute.
+ * This is done to ensure there is a 1:1 mapping between the attribute value
+ * length and the number of blocks needed to store the attribute. This makes the
+ * verification of a buffer a little more complex, but greatly simplifies the
+ * allocation, reading and writing of these attributes as we don't have to guess
+ * the number of blocks needed to store the attribute data.
+ */
struct xfs_attr3_rmt_hdr {
__be32 rm_magic;
__be32 rm_offset;
@@ -39,6 +47,8 @@ struct xfs_attr3_rmt_hdr {
extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops;
+int xfs_attr3_rmt_blocks(struct xfs_mount *mp, int attrlen);
+
int xfs_attr_rmtval_get(struct xfs_da_args *args);
int xfs_attr_rmtval_set(struct xfs_da_args *args);
int xfs_attr_rmtval_remove(struct xfs_da_args *args);