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authorLukas Czerner <lczerner@redhat.com>2014-04-12 15:56:41 +0200
committerTheodore Ts'o <tytso@mit.edu>2014-04-12 15:56:41 +0200
commit23fffa925ea2c9a2bcb1a4453e2c542635aa3545 (patch)
treeada18ccc75346035bea8c684344fa2da6eac9f5b /fs/exofs
parentfs: prevent doing FALLOC_FL_ZERO_RANGE on append only file (diff)
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fs: move falloc collapse range check into the filesystem methods
Currently in do_fallocate in collapse range case we're checking whether offset + len is not bigger than i_size. However there is nothing which would prevent i_size from changing so the check is pointless. It should be done in the file system itself and the file system needs to make sure that i_size is not going to change. The i_size check for the other fallocate modes are also done in the filesystems. As it is now we can easily crash the kernel by having two processes doing truncate and fallocate collapse range at the same time. This can be reproduced on ext4 and it is theoretically possible on xfs even though I was not able to trigger it with this simple test. This commit removes the check from do_fallocate and adds it to the file system. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Acked-by: Dave Chinner <david@fromorbit.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/exofs')
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