Commit 77c1a08f authored by Committed by Ben MyersBrowse files
xfs: struct xfs_buf_log_format isn't variable sized.
The struct xfs_buf_log_format wants to think the dirty bitmap is variable sized. In fact, it is variable size on disk simply due to the way we map it from the in-memory structure, but we still just use a fixed size memory allocation for the in-memory structure. Hence it makes no sense to set the function up as a variable sized structure when we already know it's maximum size, and we always allocate it as such. Simplify the structure by making the dirty bitmap a fixed sized array and just using the size of the structure for the allocation size. This will make it much simpler to allocate and manipulate an array of format structures for discontiguous buffer support. The previous struct xfs_buf_log_item size according to /proc/slabinfo was 224 bytes. pahole doesn't give the same size because of the variable size definition. With this modification, pahole reports the same as /proc/slabinfo: /* size: 224, cachelines: 4, members: 6 */ Because the xfs_buf_log_item size is now determined by the maximum supported block size we introduce a dependency on xfs_alloc_btree.h. Avoid this dependency by moving the idefines for the maximum block sizes supported to xfs_types.h with all the other max/min type defines to avoid any new dependencies. Signed-off-by: Dave Chinner <email@example.com> Reviewed-by: Christoph Hellwig <firstname.lastname@example.org> Signed-off-by: Ben Myers <email@example.com>