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![$ stat /etc/fstab
[anurag@zomg toyfs]$ stat /etc/fstab
File: ‘/etc/fstab’
Size: 481 Blocks: 8 IO Block: 4096 regular file
Device: fd01h/64769d Inode: 259076 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Context: system_u:object_r:etc_t:s0
Access: 2015-02-20 14:46:16.248920273 +0530
Modify: 2015-02-11 20:42:51.750210844 +0530
Change: 2015-02-11 21:56:52.520767293 +0530
Birth: -
[anurag@zomg toyfs]$](https://image.slidesharecdn.com/dzd14wxraafzf1vnbcdg-signature-8beddb31f59427bb47e0edbae8c91e4494be5facb98b49fa9eec79b54bc21a19-poli-150223023942-conversion-gate01/85/Writing-flexible-filesystems-in-FUSE-Python-18-320.jpg)
![$ stat /etc/fstab
[anurag@zomg toyfs]$ stat /etc/fstab
File: ‘/etc/fstab’
Size: 481 Blocks: 8 IO Block: 4096 regular file
Device: fd01h/64769d Inode: 259076 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Context: system_u:object_r:etc_t:s0
Access: 2015-02-20 14:46:16.248920273 +0530
Modify: 2015-02-11 20:42:51.750210844 +0530
Change: 2015-02-11 21:56:52.520767293 +0530
Birth: -
[anurag@zomg toyfs]$](https://image.slidesharecdn.com/dzd14wxraafzf1vnbcdg-signature-8beddb31f59427bb47e0edbae8c91e4494be5facb98b49fa9eec79b54bc21a19-poli-150223023942-conversion-gate01/75/Writing-flexible-filesystems-in-FUSE-Python-18-2048.jpg)
Uploaded byAnurag Patel
Writing flexible filesystems in FUSE-Python
The document discusses writing flexible filesystems using fuse-python, detailing the Fuse API, installation process, and essential methods for filesystem operations. It highlights the advantages of Fuse such as ease of use for unprivileged users and support for multiple programming languages. Additionally, it provides examples of filesystem management methods and references various fuse filesystems available.
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Similar to Writing flexible filesystems in FUSE-Python
Writing flexible filesystems in FUSE-Python
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- 3. Talk overview UNIX based filesystems What'sFUSE? FUSE API overview ToyFS Q&A
- 4. On filesystems “One of thereal contributions of UNIX has been the view that everything is a file.”
- 5. Filesystems FS Platform vfat Windows hfs+OS X ext4 Linux xfs IRIX, Linux nfs Linux* iso9660 CD-ROM fuse Linux* # cat /proc/filesystems
- 6. Files Symbol Meaning d Directory lSymbolic link c Character device b Block device s Socket p Named pipe - Regular file
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- 9. Why FUSE? Usable by unprivilegedusers Easier development cycle Easy to install (apt-get install sshfs) Multiple language support and bindings C, C++, Python, Java, Ruby, Perl, Golang, Lua Ported to FreeBSD, Mac OSX, OpenSolaris
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- 11. How do I install FUSE? # yum installfuse fuse-python # apt-get install fuse python-fuse
- 12. Loading fuse # modprobe fuse #lsmod | grep fuse
- 13. Filesystem class Subclass fuse.Fuse classand implement a number of methods.
- 14. Mount filesystem Instantiate the Filesystemclass and call main()
- 15. mount $ python toyfs.py/tmp/toy
- 16. getattr(path) Defining this methodis mandatory for a working filesystem.
- 17. The stat structure Member Description st_mode Inodeprotection mode st_ino File serial number st_dev Device ID st_nlink Number of hard links st_uid User ID of file st_gid Group ID of file st_size File size in bytes st_atime Time of last access st_mtime Time of last data modification st_ctime Time of last status change ref: <sys/stat.h>
- 18. $ stat /etc/fstab [anurag@zomg toyfs]$ stat/etc/fstab File: ‘/etc/fstab’ Size: 481 Blocks: 8 IO Block: 4096 regular file Device: fd01h/64769d Inode: 259076 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Context: system_u:object_r:etc_t:s0 Access: 2015-02-20 14:46:16.248920273 +0530 Modify: 2015-02-11 20:42:51.750210844 +0530 Change: 2015-02-11 21:56:52.520767293 +0530 Birth: - [anurag@zomg toyfs]$
- 19. st_mode st.st_mode = stat.S_IFDIR| 0755 Each bit of the output is 0 if the corresponding bit of x AND of y is 0, otherwise it's 1
- 20. ST_MODE flags Type Flag d stat.S_IFDIR lstat.S_IFLNK c stat.S_IFCHR b stat.S_IFBLK s stat.S_IFSOCK p stat.S_IFIFO - stat.S_IFREG ref: Python stat module
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- 23. Filesystem methods General File operation getattr(path)open(path, flags) mkdir(path, mode) create(path, flags, mode) rename(old, new) read(path, length, offset) mknod(path, mode, rdev) write(path, buf, offset) link(target, name) fgetattr(path) symlink(target, name) ftruncate(path, len) readlink(path) flush(path) unlink(path) release(path) fsinit(self) fsync(path, fdatasync)
- 24. FUSE filesystems fuse-zip, rarfs, mysqlfs,cryptfs, httpfs, sshfs, imapfs, gmailfs, flickrfs, ntfs-3g, gitfs, and many many more...
- 25. THE END ToyFS on Github→ FUSE Project → FUSE Python reference → —@gnurag anurag@redhat.com