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authorMingming Cao <cmm@us.ibm.com>2008-07-13 21:06:39 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-07-13 21:06:39 -0400
commit530576bbf379fc45cfb34f246257d8526db44567 (patch)
treed4a89bf6f2736816e1b43abfdafcf2d61bbd19ef /fs/ext4
parent772cb7c83ba256a11c7bf99a11bef3858d23767c (diff)
downloadlinux-530576bbf379fc45cfb34f246257d8526db44567.tar.bz2
jbd2: fix race between jbd2_journal_try_to_free_buffers() and jbd2 commit transaction
journal_try_to_free_buffers() could race with jbd commit transaction when the later is holding the buffer reference while waiting for the data buffer to flush to disk. If the caller of journal_try_to_free_buffers() request tries hard to release the buffers, it will treat the failure as error and return back to the caller. We have seen the directo IO failed due to this race. Some of the caller of releasepage() also expecting the buffer to be dropped when passed with GFP_KERNEL mask to the releasepage()->journal_try_to_free_buffers(). With this patch, if the caller is passing the GFP_KERNEL to indicating this call could wait, in case of try_to_free_buffers() failed, let's waiting for journal_commit_transaction() to finish commit the current committing transaction , then try to free those buffers again with journal locked. Signed-off-by: Mingming Cao <cmm@us.ibm.com> Reviewed-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
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