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Diffstat (limited to 'fs/xfs/libxfs/xfs_da_format.h')
-rw-r--r--fs/xfs/libxfs/xfs_da_format.h14
1 files changed, 13 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_da_format.h b/fs/xfs/libxfs/xfs_da_format.h
index 0a49b0286372..74bcbabfa523 100644
--- a/fs/xfs/libxfs/xfs_da_format.h
+++ b/fs/xfs/libxfs/xfs_da_format.h
@@ -725,7 +725,13 @@ struct xfs_attr3_icleaf_hdr {
__uint16_t magic;
__uint16_t count;
__uint16_t usedbytes;
- __uint16_t firstused;
+ /*
+ * firstused is 32-bit here instead of 16-bit like the on-disk variant
+ * to support maximum fsb size of 64k without overflow issues throughout
+ * the attr code. Instead, the overflow condition is handled on
+ * conversion to/from disk.
+ */
+ __uint32_t firstused;
__u8 holes;
struct {
__uint16_t base;
@@ -734,6 +740,12 @@ struct xfs_attr3_icleaf_hdr {
};
/*
+ * Special value to represent fs block size in the leaf header firstused field.
+ * Only used when block size overflows the 2-bytes available on disk.
+ */
+#define XFS_ATTR3_LEAF_NULLOFF 0
+
+/*
* Flags used in the leaf_entry[i].flags field.
* NOTE: the INCOMPLETE bit must not collide with the flags bits specified
* on the system call, they are "or"ed together for various operations.