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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 guaranteed 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
86 It returns an error on failure, without setting
89 Possible failure conditions:
94 argument is not a valid file descriptor.
98 argument references a file that was opened without write permission.
103 is greater than the maximum file size.
105 A signal was caught during execution.
109 argument was less than or equal to zero, the
111 argument was less than zero,
112 or the operation is not supported by the file system.
114 An I/O error occurred while reading from or writing to a file system.
118 argument does not refer to a regular file.
120 There is insufficient free space remaining on the file system storage
122 .It Bq Er ENOTCAPABLE
125 has insufficient rights.
129 argument is associated with a pipe or FIFO.
139 system call conforms to
148 and this manual page were initially written by
149 .An Matthew Fleming Aq Mt mdf@FreeBSD.org .