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Before this patch, problems reading in indirect buffers would send an IO error back to the caller, and release the buffer_head with brelse() in function gfs2_meta_indirect_buffer, however, it would still return the address of the buffer_head it released. After the error was discovered, function gfs2_block_map would call function release_metapath to free all buffers. That checked: if (mp->mp_bh[i] == NULL) but since the value was set after the error, it was non-zero, so brelse was called a second time. This resulted in the following error: kernel: WARNING: at fs/buffer.c:1224 __brelse+0x3a/0x40() (Tainted: G W -- ------------ ) kernel: Hardware name: RHEV Hypervisor kernel: VFS: brelse: Trying to free free buffer This patch changes gfs2_meta_indirect_buffer so it only sets the buffer_head pointer in cases where it isn't released. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.