I find in the routine ffs_blkfree() there is a new statement saying:
VOP_FREEBLKS(ip->i_devvp, fsbtodb(fs, bno), size);
which calls spec_freeblks() in file spec_vnops.c. The routine
spec_freeblks() looks simple. When D_CANFREE is set, it gets an empty
buffer and call strategy routine for the buffer. Since B_READ is not set,
we must call the strategy routine to write some data. But where is the
data for the buffer? Why we call VOP_FREEBLKS() at the time we are going
to free the blocks? BTW, this vnode operation is not listed in the man
pages.
Any help is appreciated.
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Zhihui Zhang. Please visit http://www.freebsd.org
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