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9.5. xfs_ioctl - Space Allocation
allocsp/freesp
allocate space
zeros
updates the inode size
resvsp/unresvsp is for allocating but not zeroing
efficient way for applications to take advantage of unwritten extents
posix fallocate has no generic interface to call into the kernel
current implementation just writes zeros from user space
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9.4. xfs_ioctl - Attribute Flags
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9.6. xfs_ioctl - Bulkstat
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