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A simple filesystem to understand things. This is a Work In Progress. Do not use this yet. The source files are licensed under Creative Commons Zero License. More information at: http://creativecommons.org/publicdomain/zero/1.0/ Full license text at: http://creativecommons.org/publicdomain/zero/1.0/legalcode To compile: ------------ install linux kernel sources and run make from the checkedout directory. To test: --------- ~/src/simplefs> make ~/src/simplefs> dd bs=4096 count=100 if=/dev/zero of=image 100+0 records in 100+0 records out 409600 bytes (410 kB) copied, 0.00175839 s, 233 MB/s ~/src/simplefs> ./mkfs-simplefs image Super block written succesfully root directory inode written succesfully welcomefile inode written succesfully inode store padding bytes (after the two inodes) written sucessfully root directory datablocks (name+inode_no pair for welcomefile) written succesfully padding after the rootdirectory children written succesfully welcomefilebody has been written succesfully ~/src/simplefs> linux-okb0:/home/psankar/src/simplefs # insmod simplefs.ko;mount -o loop -t simplefs image /home/psankar/src/simplefs/mount/;dmesg [ 8717.049630] Sucessfully registered simplefs [ 8717.056140] The magic number obtained in disk is: [268640275] [ 8717.056147] simplefs filesystem of version [1] formatted with a block size of [4096] detected in the device. [ 8717.056183] simplefs is succesfully mounted on [/dev/loop4] linux-okb0:/home/psankar/src/simplefs # cd mount linux-okb0:/home/psankar/src/simplefs/mount # ls vanakkam linux-okb0:/home/psankar/src/simplefs/mount # ls -lh total 0 ---------- 1 root root 0 Apr 23 14:25 vanakkam linux-okb0:/home/psankar/src/simplefs/mount # cd .. linux-okb0:/home/psankar/src/simplefs # umount mount linux-okb0:/home/psankar/src/simplefs # rmmod simplefs.ko linux-okb0:/home/psankar/src/simplefs # dmesg -c [ 8717.049630] Sucessfully registered simplefs [ 8717.056140] The magic number obtained in disk is: [268640275] [ 8717.056147] simplefs filesystem of version [1] formatted with a block size of [4096] detected in the device. [ 8717.056183] simplefs is succesfully mounted on [/dev/loop4] [ 8735.146533] simplefs superblock is destroyed. Unmount succesful. [ 8740.101526] Sucessfully unregistered simplefs linux-okb0:/home/psankar/src/simplefs #