Maxim Sobolev
e8534ba3ad
With soft updates, ffs_syncvnode() writes the inode between its passes while buffers are still dirty. That write can go out with new block pointers rolled back, for instance a new indirect block whose contents are only written in a later pass, yet ffs_update() clears IN_SIZEMOD and IN_IBLKDATA because the write was synchronous. A data-only sync then decides at the end that the inode need not be written, and fdatasync(2) or an O_DSYNC write that allocated the first indirect block returned with the on-disk inode not pointing to it. Note on entry whether a data-only sync has to write the inode, and base the final write, done once all dependencies are flushed, on that alone: nothing else can set IN_SIZEMOD or IN_IBLKDATA meanwhile, as the vnode is locked. A full sync always writes the inode last and was not affected. 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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