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authorJan Kara <jack@suse.cz>2011-06-24 22:29:41 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-21 04:47:45 +0400
commit9ea7df534ed2a18157434a496a12cf073ca00c52 (patch)
treef8fa09102093cbc60249f96ec4fb91985ae8659b /fs/direct-io.c
parent582686915803e34adc8fdcd90bff7ca7f6a42221 (diff)
downloadlinux-9ea7df534ed2a18157434a496a12cf073ca00c52.tar.xz
ext4: Rewrite ext4_page_mkwrite() to use generic helpers
Rewrite ext4_page_mkwrite() to use __block_page_mkwrite() helper. This removes the need of using i_alloc_sem to avoid races with truncate which seems to be the wrong locking order according to lock ordering documented in mm/rmap.c. Also calling ext4_da_write_begin() as used by the old code seems to be problematic because we can decide to flush delay-allocated blocks which will acquire s_umount semaphore - again creating unpleasant lock dependency if not directly a deadlock. Also add a check for frozen filesystem so that we don't busyloop in page fault when the filesystem is frozen. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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