From: Theodore Ts'o Date: Sun, 16 May 2010 23:00:00 +0000 (-0400) Subject: ext4: Add new abstraction ext4_map_blocks() underneath ext4_get_blocks() X-Git-Tag: v2.6.35-rc1~39^2~13 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e35fd6609b2fee54484d520deccb8f18bf7d38f3;p=pandora-kernel.git ext4: Add new abstraction ext4_map_blocks() underneath ext4_get_blocks() Jack up ext4_get_blocks() and add a new function, ext4_map_blocks() which uses a much smaller structure, struct ext4_map_blocks which is 20 bytes, as opposed to a struct buffer_head, which nearly 5 times bigger on an x86_64 machine. By switching things to use ext4_map_blocks(), we can save stack space by using ext4_map_blocks() since we can avoid allocating a struct buffer_head on the stack. Signed-off-by: "Theodore Ts'o" --- Reading git-diff-tree failed