Hi all, This is v3 of the speculative preallocation inode tracking patchset. This functionality tracks inodes with post-EOF speculative preallocation for the purpose of background and on-demand trimming. Background scanning occurs on a longish interval (5 minutes by default) and in a best-effort mode (i.e., inodes are skipped due to lock contention or dirty cache). The intent is to clear up post-EOF blocks on inodes that might have allocations hanging around due to open-write-close sequences (NFS). On demand scanning is provided via a new ioctl and supports various parameters such as scan mode, filtering by quota id and minimum file size. A pending use case for on demand scanning is for accurate quota accounting via the gluster scale out filesystem (i.e., to free up preallocated space when near a usage limit). Brian P.S., I've rebased and run this through xfstests a couple times. I'll probably run at least once more with a low background scan interval just for sanity sake. Also, Dave previously mentioned this conflicts with the xfssyncd patchset. I can rebase on top of that if there is any preference in terms of order. v3: - Pushed dirty cache check up into patch 5 (minor clean up). - Reworked xfs_can_free_eofblocks() in patch 3 as per Dave C.'s review. - Rebased from linus' tree to the XFS tree. v2: - Remove unnecessary inode flag clear helper. - Condense eofblocks set/clear tag functions. - Move clear tag call into xfs_free_eofblocks(). - Modify AG walk infrastructure to support tag-based walk and utilize this functionality for the eofblocks scan (as opposed to the previous code duplicated from reclaim scanning). - Improve ioctl functionality: new data structure fields/flags, validate quota is enabled. - Increase default background scanning interval to 5 minutes, add tunable. Brian Foster (8): xfs: add EOFBLOCKS inode tagging/untagging xfs: support a tag-based inode_ag_iterator xfs: create helper to check whether to free eofblocks on inode xfs: export xfs_free_eofblocks() and return EAGAIN on trylock failure xfs: create function to scan and clear EOFBLOCKS inodes xfs: add XFS_IOC_FREE_EOFBLOCKS ioctl xfs: add enhanced filtering to EOFBLOCKS scan xfs: add background scanning to clear EOFBLOCKS inodes fs/xfs/xfs_ag.h | 1 + fs/xfs/xfs_fs.h | 23 +++++ fs/xfs/xfs_globals.c | 1 + fs/xfs/xfs_ioctl.c | 20 ++++ fs/xfs/xfs_iomap.c | 7 ++ fs/xfs/xfs_iops.c | 3 + fs/xfs/xfs_linux.h | 1 + fs/xfs/xfs_mount.h | 2 + fs/xfs/xfs_qm_syscalls.c | 5 +- fs/xfs/xfs_sync.c | 215 ++++++++++++++++++++++++++++++++++++++++++++-- fs/xfs/xfs_sync.h | 11 ++- fs/xfs/xfs_sysctl.c | 9 ++ fs/xfs/xfs_sysctl.h | 1 + fs/xfs/xfs_trace.h | 6 ++ fs/xfs/xfs_vnodeops.c | 27 +++--- fs/xfs/xfs_vnodeops.h | 41 +++++++++- 16 files changed, 344 insertions(+), 29 deletions(-) -- 1.7.7.6 _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
