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VOP_ALLOCATE(9)		 BSD Kernel Developer's	Manual	       VOP_ALLOCATE(9)

NAME
     VOP_ALLOCATE -- allocate storage for a file

SYNOPSIS
     #include <sys/param.h>
     #include <sys/vnode.h>

     int
     VOP_ALLOCATE(struct vnode *vp, off_t *offset, off_t *len);

DESCRIPTION
     This call allocates storage for a range of	offsets	in a file.  It is used
     to	implement the posix_fallocate system call.

     Its arguments are:

     vp	     The vnode of the file.

     offset  The start of the range to allocate	storage	for in the file.

     len     The length	of the range to	allocate storage for in	the file.

     The offset	and len	arguments are updated to reflect the portion of	the
     range that	still needs to be allocated on return.	A partial allocation
     is	considered a successful	operation.  The	file's contents	are not
     changed.

LOCKS
     The file should be	exclusively locked on entry and	will still be locked
     on	exit.

RETURN VALUES
     Zero is returned if the call is successful, otherwise an appropriate er-
     ror code is returned.

ERRORS
     [EFBIG]		An attempt was made to write a file that exceeds the
			process's file size limit or the maximum file size.

     [ENOSPC]		The file system	is full.

     [EPERM]		An append-only flag is set on the file,	but the	caller
			is attempting to write before the current end of file.

SEE ALSO
     vnode(9), VOP_READ(9), VOP_WRITE(9)

BSD				October	3, 2013				   BSD

NAME | SYNOPSIS | DESCRIPTION | LOCKS | RETURN VALUES | ERRORS | SEE ALSO

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