# cat /proc/filesystems
nodev sysfs
nodev rootfs
nodev bdev
nodev proc
nodev sockfs
nodev usbfs
nodev pipefs
nodev anon_inodefs
nodev tmpfs
nodev inotifyfs
nodev devpts
ext3
ext2
nodev ramfs
vfat
nodev nfs
nodev jffs2
nodev rpc_pipefs
代码位于fs/filesystems.c下,module_init(proc_filesystems_init);
需要开启CONFIG_PROC_FS宏
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