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authorFilipe David Manana <[email protected]>2010-12-28 10:57:04 +0000
committerBjörn-Egil Dahlberg <[email protected]>2013-01-09 18:15:02 +0100
commitc48348233c467f7dc96728a31710abbb12cbe1f1 (patch)
tree61799089ba9052042ead12755a36b5bb818884ba /bin
parent9229901660ef1c163ea82c76ea3dc21f5a4f83d4 (diff)
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Add file:allocate/3 operation
This operation allows pre-allocation of space for files. It succeeds only on systems that support such operation. The POSIX standard defines the optional system call posix_fallocate() to implement this feature. However, some systems implement more specific functions to accomplish the same operation. On Linux, if the more specific function fallocate() is implemented, it is used instead of posix_fallocate(), falling back to posix_fallocate() if the fallocate() call failed (it's only supported for the ext4, ocfs2, xfs and btrfs file systems at the moment). On Mac OS X it uses the specific fcntl() operation F_PREALLOCATE, falling back to posix_fallocate() if it's available (at the moment Mac OS X doesn't provide posix_fallocate()). On any other UNIX system, it uses posix_fallocate() if it's available. Any other system not providing this system call or any function to pre-allocate space for files, this operation always fails with the ENOTSUP POSIX error.
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