From: Dave Chinner Date: Sun, 29 Apr 2012 12:43:19 +0000 (+1000) Subject: xfs: limit specualtive delalloc to maxioffset X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3ed9116e8a3e9c0870b2076340b3da9b8f900f3b;p=linux-beck.git xfs: limit specualtive delalloc to maxioffset Speculative delayed allocation beyond EOF near the maximum supported file offset can result in creating delalloc extents beyond mp->m_maxioffset (8EB). These can never be trimmed during xfs_free_eof_blocks() because they are beyond mp->m_maxioffset, and that results in assert failures in xfs_fs_destroy_inode() due to delalloc blocks still being present. xfstests 071 exposes this problem. Limit speculative delalloc to mp->m_maxioffset to avoid this problem. Signed-off-by: Dave Chinner Signed-off-by: Ben Myers --- diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 47e714a7bf92..7aa0c1de2e05 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -415,6 +415,15 @@ retry: return error; } + /* + * Make sure preallocation does not create extents beyond the range we + * actually support in this filesystem. + */ + if (last_fsb > XFS_B_TO_FSB(mp, mp->m_maxioffset)) + last_fsb = XFS_B_TO_FSB(mp, mp->m_maxioffset); + + ASSERT(last_fsb > offset_fsb); + nimaps = XFS_WRITE_IMAPS; error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb, imap, &nimaps, XFS_BMAPI_ENTIRE);