https://github.com/torvalds/linux
Revision d096ad0f79a782935d2e06ae8fb235e8c5397775 authored by Michael Tokarev on 25 December 2012, 19:08:16 UTC, committed by Theodore Ts'o on 25 December 2012, 19:08:16 UTC
When a journal-less ext4 filesystem is mounted on a read-only block device (blockdev --setro will do), each remount (for other, unrelated, flags, like suid=>nosuid etc) results in a series of scary messages from kernel telling about I/O errors on the device. This is becauese of the following code ext4_remount(): if (sbi->s_journal == NULL) ext4_commit_super(sb, 1); at the end of remount procedure, which forces writing (flushing) of a superblock regardless whenever it is dirty or not, if the filesystem is readonly or not, and whenever the device itself is readonly or not. We only need call ext4_commit_super when the file system had been previously mounted read/write. Thanks to Eric Sandeen for help in diagnosing this issue. Signed-off-By: Michael Tokarev <mjt@tls.msk.ru> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@vger.kernel.org
1 parent 0875a2b
Tip revision: d096ad0f79a782935d2e06ae8fb235e8c5397775 authored by Michael Tokarev on 25 December 2012, 19:08:16 UTC
ext4: do not try to write superblock on ro remount w/o journal
ext4: do not try to write superblock on ro remount w/o journal
Tip revision: d096ad0
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