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28 .\" @(#)open.2 8.2 (Berkeley) 11/16/93
36 .Nd pre-allocate storage for a range in a file
42 .Fn posix_fallocate "int fd" "off_t offset" "off_t len"
44 Required storage for the range
49 in the file referenced by
51 is guarateed to be allocated upon successful return.
54 returns successfully, subsequent writes to the specified file data
55 will not fail due to lack of free space on the file system storage
57 Any existing file data in the specified range is unmodified.
61 is beyond the current file size, then
63 will adjust the file size to
66 Otherwise, the file size will not be changed.
70 will be freed by a successful call to
74 that truncates the size of the file.
77 may be freed by a successful call to
79 that reduces the file size to a size smaller than
87 It returns -1 on failure, and sets
89 to indicate the error.
91 Possible failure conditions:
96 argument is not a valid file descriptor.
100 argument references a file that was opened without write permission.
105 is greater than the maximum file size.
107 A signal was caught during execution.
111 argument was zero or the
113 argument was less than zero.
115 An I/O error occurred while reading from or writing to a file system.
119 argument does not refer to a regular file.
121 There is insufficient free space remaining on the file system storage
126 argument is associated with a pipe or FIFO.
136 system call conforms to
145 and this manual page were initially written by
146 .An Matthew Fleming Aq mdf@FreeBSD.org .