Maxim Sobolev
1498efc424
A data-only ffs_syncvnode() skips dirty indirect blocks on file systems without soft updates, and with soft updates stops making passes once only indirect blocks are left dirty. Indirect blocks only get dirty when the block pointers in them change, and those pointers are what makes a newly allocated block reachable. So when fdatasync() follows a write that extended the file or filled a hole past the direct blocks, the data and the inode size reached the disk but the pointer to the new block did not, and a crash lost the "synced" data. With soft updates the indirect block was usually written once, with the new pointer rolled back, and never rewritten. POSIX requires fdatasync() to write the metadata needed to retrieve the data, which52488b5148already acknowledged for the inode, so treat dirty indirect blocks the same way for a data-only sync as for a full one. This restores the loop to what it was before2f514f92cf. Plain overwrites, the case data-only sync is meant to speed up, do not dirty indirect blocks and still write neither them nor the inode. Fixes:2f514f92cf("Implement VOP_FDATASYNC() for UFS.") Sponsored by: Sippy Software, Inc. Reviewed by: kib Tested by: pho Differential Revision: https://reviews.freebsd.org/D60134 MFC after: 1 month
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