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Update README with test instructions covering all supported filesystem operations
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Sankar சங்கர்
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README
110
README
@ -25,7 +25,7 @@ Memory leaks may (will ?) exist.
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Credits
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--------
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All the source code is written by me (Sankar P) until this point.
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All the source code is written by me (Sankar P) until this point.
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An O_LARGETHANKS to the guidance of VijaiBabu M and Santosh Venugopal. Their excellent talks on filesystems motivated me to implement a file system from the scratch. Without their inspirational speeches, I would not have focussed on filesystems.
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@ -36,10 +36,6 @@ Special thanks to Ankit Jain who provides interesting conversations to help my i
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TODO
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-----
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- Check the locks. Remove/Add locks as necessary
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- Fix the bug related to creation of files in subdirs
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- Fix various README / TODO comments in the code
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- Send for review
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- Make a 1.0 release
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- After the 1.0 release, start with support for extents, which on completion will be 2.0
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- After the 2.0 release, start with journalling support, which on completion will be 3.0
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@ -64,7 +60,7 @@ psankar@linux-9dni:~/src/simplefs> dd bs=4096 count=100 if=/dev/zero of=image
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100+0 records in
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100+0 records out
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409600 bytes (410 kB) copied, 0.00106827 s, 383 MB/s
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psankar@linux-9dni:~/src/simplefs> ./mkfs-simplefs image
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psankar@linux-9dni:~/src/simplefs> ./mkfs-simplefs image
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Super block written succesfully
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root directory inode written succesfully
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welcomefile inode written succesfully
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@ -76,31 +72,97 @@ welcomefilebody has been written succesfully
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psankar@linux-9dni:~/src/simplefs>
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Now as root:
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linux-9dni:/home/psankar/src/simplefs # insmod simplefs.ko ; mount -o loop -t simplefs image /home/psankar/src/simplefs/mount/
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linux-9dni:/home/psankar/src/simplefs # insmod simplefs.ko ; mount -o loop -t simplefs image /home/psankar/src/simplefs/mount/ ; dmesg
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[41932.281196] Sucessfully registered simplefs
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[41932.284811] The magic number obtained in disk is: [268640275]
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[41932.284813] simplefs filesystem of version [1] formatted with a block size of [4096] detected in the device.
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[41932.284823] simplefs is succesfully mounted on [/dev/loop16]
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linux-9dni:/home/psankar/src/simplefs # cd mount/
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linux-9dni:/home/psankar/src/simplefs/mount # ls
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vanakkam
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linux-9dni:/home/psankar/src/simplefs/mount # cat vanakkam
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Love is God. God is Love. Anbe Murugan.
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linux-9dni:/home/psankar/src/simplefs/mount # cp vanakkam Hello
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linux-9dni:/home/psankar/src/simplefs/mount # cat Hello
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linux-9dni:/home/psankar/src/simplefs/mount # cp vanakkam hello
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linux-9dni:/home/psankar/src/simplefs/mount # cat hello
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Love is God. God is Love. Anbe Murugan.
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linux-9dni:/home/psankar/src/simplefs/mount # echo "Hello World" > Hello
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linux-9dni:/home/psankar/src/simplefs/mount # cat Hello
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linux-9dni:/home/psankar/src/simplefs/mount # echo "Hello World" > hello
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linux-9dni:/home/psankar/src/simplefs/mount # cat hello
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Hello World
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linux-9dni:/home/psankar/src/simplefs/mount # mkdir dir
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linux-9dni:/home/psankar/src/simplefs/mount # cd dir
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linux-9dni:/home/psankar/src/simplefs/mount/dir # cp ../Hello .
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linux-9dni:/home/psankar/src/simplefs/mount/dir # cat Hello
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linux-9dni:/home/psankar/src/simplefs/mount # mkdir dir1
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linux-9dni:/home/psankar/src/simplefs/mount # cd dir1
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linux-9dni:/home/psankar/src/simplefs/mount/dir1 # cp ../hello .
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linux-9dni:/home/psankar/src/simplefs/mount/dir1 # cat hello
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Hello World
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linux-9dni:/home/psankar/src/simplefs/mount/dir # echo "Vanakkam Ulagam" > Hello
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linux-9dni:/home/psankar/src/simplefs/mount/dir # cat Hello
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Vanakkam Ulagam
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linux-9dni:/home/psankar/src/simplefs/mount/dir # ...
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linux-9dni:/home/psankar/src/simplefs # umount mount ; rmmod simplefs.ko
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linux-9dni:/home/psankar/src/simplefs # #Now let us remount and see if all the changes were written to the disk
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linux-9dni:/home/psankar/src/simplefs/mount/dir1 # echo "First level directory" > hello
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linux-9dni:/home/psankar/src/simplefs/mount/dir1 # cat hello
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First level directory
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linux-9dni:/home/psankar/src/simplefs/mount/dir1 # mkdir dir2
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linux-9dni:/home/psankar/src/simplefs/mount/dir1 # cd dir2
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linux-9dni:/home/psankar/src/simplefs/mount/dir1/dir2 # touch hello
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linux-9dni:/home/psankar/src/simplefs/mount/dir1/dir2 # cat hello
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linux-9dni:/home/psankar/src/simplefs/mount/dir1/dir2 # echo "Second level directory" > hello
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linux-9dni:/home/psankar/src/simplefs/mount/dir1/dir2 # cat hello
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Second level directory
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linux-9dni:/home/psankar/src/simplefs/mount/dir1/dir2 # ...
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linux-9dni:/home/psankar/src/simplefs/mount # ..
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linux-9dni:/home/psankar/src/simplefs # umount mount ; rmmod simplefs.ko ;
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linux-9dni:/home/psankar/src/simplefs # insmod simplefs.ko ; mount -o loop -t simplefs image /home/psankar/src/simplefs/mount/
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linux-9dni:/home/psankar/src/simplefs # cd mount/
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linux-9dni:/home/psankar/src/simplefs/mount # cat Hello
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linux-9dni:/home/psankar/src/simplefs # cd mount
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linux-9dni:/home/psankar/src/simplefs/mount # ls -lR
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.:
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total 0
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drwxr-xr-x 1 root root 0 Aug 5 22:43 dir1
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---------- 1 root root 0 Aug 5 22:43 hello
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---------- 1 root root 0 Aug 5 22:43 vanakkam
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./dir1:
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total 0
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drwxr-xr-x 1 root root 0 Aug 5 22:43 dir2
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---------- 1 root root 0 Aug 5 22:43 hello
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./dir1/dir2:
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total 0
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-rw-r--r-- 1 root root 0 Aug 5 22:43 hello
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linux-9dni:/home/psankar/src/simplefs/mount # cat hello
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Hello World
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linux-9dni:/home/psankar/src/simplefs/mount #
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linux-9dni:/home/psankar/src/simplefs/mount # cd dir1
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linux-9dni:/home/psankar/src/simplefs/mount/dir1 # cat hello
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First level directory
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linux-9dni:/home/psankar/src/simplefs/mount/dir1 # cd dir2/
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linux-9dni:/home/psankar/src/simplefs/mount/dir1/dir2 # cat hello
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Second level directory
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linux-9dni:/home/psankar/src/simplefs/mount/dir1/dir2 # ...
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linux-9dni:/home/psankar/src/simplefs/mount # ..
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linux-9dni:/home/psankar/src/simplefs # umount mount ; rmmod simplefs.ko ;
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linux-9dni:/home/psankar/src/simplefs # dmesg
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[41932.281196] Sucessfully registered simplefs
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[41932.284811] The magic number obtained in disk is: [268640275]
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[41932.284813] simplefs filesystem of version [1] formatted with a block size of [4096] detected in the device.
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[41932.284823] simplefs is succesfully mounted on [/dev/loop16]
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[41951.102689] No inode found for the filename [hello]
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[41951.102706] No inode found for the filename [hello]
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[41951.102724] No inode found for the filename [hello]
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[41951.102731] New file creation request
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[41951.102986] The new filesize that is written is: [41] and len was: [41]
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[41961.195423] The new filesize that is written is: [12] and len was: [12]
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[41968.055946] No inode found for the filename [dir1]
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[41968.055959] New directory creation request
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[41980.265026] No inode found for the filename [hello]
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[41980.265073] No inode found for the filename [hello]
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[41980.265082] New file creation request
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[41980.265168] The new filesize that is written is: [12] and len was: [12]
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[41991.857978] The new filesize that is written is: [22] and len was: [22]
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[41999.993579] No inode found for the filename [dir2]
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[41999.993592] New directory creation request
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[42005.461745] No inode found for the filename [hello]
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[42005.461756] New file creation request
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[42016.694882] The new filesize that is written is: [23] and len was: [23]
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[42024.480843] simplefs superblock is destroyed. Unmount succesful.
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[42024.485339] Sucessfully unregistered simplefs
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[42031.157983] Sucessfully registered simplefs
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[42031.162331] The magic number obtained in disk is: [268640275]
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[42031.162334] simplefs filesystem of version [1] formatted with a block size of [4096] detected in the device.
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[42031.162360] simplefs is succesfully mounted on [/dev/loop17]
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[42104.389807] simplefs superblock is destroyed. Unmount succesful.
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[42104.395575] Sucessfully unregistered simplefs
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linux-9dni:/home/psankar/src/simplefs #
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