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Re: [PATCH 1/4] fs: split update_time() into update_time() and write_tim

To: Chris Mason <clm@xxxxxx>
Subject: Re: [PATCH 1/4] fs: split update_time() into update_time() and write_time()
From: Theodore Ts'o <tytso@xxxxxxx>
Date: Fri, 21 Nov 2014 16:42:45 -0500
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, Ext4 Developers List <linux-ext4@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
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Out of curiosity, why does btrfs_update_time() need to call
btrfs_root_readonly()?  Why can't it just depend on the
__mnt_want_write() call in touch_atime()?

Surely if there are times when it's not OK to write into a btrfs file
system and mnt_is_readonly() returns false, the VFS is going to get
very confused abyway.

If the btrfs_update_time() is not necessary, then we could drop
btrfs_update_time() and update_time() from the inode operations
entirely, and depend on the VFS-level code in update_time().

                                           - Ted

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