[HDFS-1841] Enforce read-only permissions in FUSE open()

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 0.20.2
• Component/s: fuse-dfs

Environment

Linux 2.6.35

• Assignee: Unassigned
• Reporter: Brian Bloniarz
• Created: 15/Apr/11 19:43
• Updated: 13/Mar/15 23:15
• Resolved: 13/Mar/15 23:15

Description

fuse-dfs currently allows files to be created on a read-only filesystem:

$ fuse_dfs_wrapper.sh dfs://example.com:8020 ro ~/hdfs
$ touch ~/hdfs/foobar

Attached is a simple patch, which does two things:
1) Checks the read_only flag inside dfs_open().
2) Passes the read-only mount option to FUSE when ro is specified on the commandline. This is probably a better long-term solution; the kernel will enforce the read-only operations without it being necessary inside the client.

Issue Links

• duplicates: HDFS-4139 fuse-dfs RO mode still allows file truncation