Hi Yangtao, On Wed, 2025-05-07 at 08:55 -0600, Yangtao Li wrote: > hfs currently has some function tracking points, > which are helpful for problem analysis, but rely on > modifying the DBG_MASK macro. > > Modifying the macro requires recompiling the kernel, > and the control of the log is more troublesome. > > Let's export this debug facility to debugfs so that > it can be easily controlled through the node. > > node: > /sys/kernel/debug/hfs/dbg_flags > > for_each_bit: > > DBG_BNODE_REFS 0x00000001 > DBG_BNODE_MOD 0x00000002 > DBG_CAT_MOD 0x00000004 > DBG_INODE 0x00000008 > DBG_SUPER 0x00000010 > DBG_EXTENT 0x00000020 > DBG_BITMAP 0x00000040 > Frankly speaking, if we would like to rework the debugging framework in HFS/HFS+, then I prefer to switch on pr_debug() and to use dynamic debug framework of Linux kernel [1]. It will provide the more flexible solution. Thanks, Slava. [1] https://www.kernel.org/doc/html/v4.14/admin-guide/dynamic-debug-howto.html
