3b6056204d
Writes on UFS through a mapped region do not allocate disk blocks in holes immediately. The blocks are allocated when the pages are paged out first time. This breaks the algorithm in vn_bmap_seekhole() and ufs_bmap_seekdata(), because VOP_BMAP() reports hole for the place which already contains a valid data. Clean the pages before doing VOP_BMAP() in the affected functions. In principle, we could clean less by only requesting clean starting from the offset, but it is probably not very important. PR: 269261 Reported by: asomers Reviewed by: asomers, markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D38379 |
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