1 files changed, 22 insertions, 0 deletions

diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
index 048b59d5b2f..c70111ebefd 100644
--- a/fs/squashfs/Kconfig
+++ b/fs/squashfs/Kconfig
@@ -78,6 +78,28 @@ config SQUASHFS_XZ
 
           If unsure, say N.
 
+config SQUASHFS_4K_DEVBLK_SIZE
+        bool "Use 4K device block size?"
+        depends on SQUASHFS
+        help
+          By default Squashfs sets the dev block size (sb_min_blocksize)
+          to 1K or the smallest block size supported by the block device
+          (if larger).  This, because blocks are packed together and
+          unaligned in Squashfs, should reduce latency.
+
+          This, however, gives poor performance on MTD NAND devices where
+          the optimal I/O size is 4K (even though the devices can support
+          smaller block sizes).
+
+          Using a 4K device block size may also improve overall I/O
+          performance for some file access patterns (e.g. sequential
+          accesses of files in filesystem order) on all media.
+
+          Setting this option will force Squashfs to use a 4K device block
+          size by default.
+
+          If unsure, say N.
+
 config SQUASHFS_EMBEDDED
         bool "Additional option for memory-constrained systems"
         depends on SQUASHFS