| Developer | Red Hat |
|---|---|
| Full name | Global File System 2 |
| Introduced | 2005 with Linux 2.6.19 |
| Directory contents | Hashed (small directories stuffed into inode) |
| File allocation | bitmap (resource groups) |
| Bad blocks | No |
| Max no. of files | Variable |
| Max filename length | 255 bytes |
| Allowed filename characters | All except NUL |
| Dates recorded | attribute modification (ctime), modification (mtime), access (atime) |
| Date resolution | Nanosecond |
| Attributes | No-atime, journaled data (regular files only), inherit journaled data (directories only), synchronous-write, append-only, immutable, exhash (dirs only, read only) |
| File system permissions | Unix permissions, ACLs and arbitrary security attributes |
| Transparent compression | No |
| Transparent encryption | No |
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