fallocate: add FALLOC_FL_ZERO_RANGE support
Recent Linux kernel supports FALLOC_FL_ZERO_RANGE in fallocate(2). This patch adds FALLOC_FL_ZERO_RANGE support to fallocate utility, by introducing a new option -z|--zero-range. Signed-off-by: Lukas Czerner <lczerner@redhat.com>
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@ -7,6 +7,7 @@ fallocate \- preallocate or deallocate space to a file
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.RB [ \-n ]
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.RB [ \-p ]
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.RB [ \-c ]
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.RB [ \-z ]
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.RB [ \-o
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.IR offset ]
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.B \-l
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@ -46,6 +47,9 @@ Do not modify the apparent length of the file. This may effectively allocate
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blocks past EOF, which can be removed with a truncate.
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.IP "\fB\-p, \-\-punch-hole\fP"
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Punch holes in the file, the range should not exceed the length of the file.
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This option may not be specified at the same time as the
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.B \-z
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option.
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.IP "\fB\-d, \-\-dig-holes\fP"
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Detect and dig holes. Makes the file sparse in-place, without using extra disk
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space. The minimal size of the hole depends on filesystem I/O block size
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@ -61,6 +65,16 @@ Collapse a particular file range to nullify the hole. Extents beyond the range
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command does not leave a hole, while \fI\-\-punch-hole\fP leaves a hole
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instead of shifting extents. Both offset and length should be aligned to
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the block size of filesystem.
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.IP "\fB\-z, \-\-zero-range\fP"
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Zero range in the file. Regions that span holes in the file will be
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preallocated, this includes areas past EOF. Option
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.B \-n
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can be specified to prevent file length modification. Reads from the range
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will return zeros. This option may not be specified at the same time as the
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.B \-p
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or
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.B \-c
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option.
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.IP "\fB\-o, \-\-offset\fP \fIoffset\fP
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Specifies the beginning offset of the allocation, in bytes.
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.IP "\fB\-l, \-\-length\fP \fIlength\fP
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@ -40,20 +40,24 @@
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#if defined(HAVE_LINUX_FALLOC_H) && \
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(!defined(FALLOC_FL_KEEP_SIZE) || !defined(FALLOC_FL_PUNCH_HOLE) || \
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!defined(FALLOC_FL_COLLAPSE_RANGE))
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!defined(FALLOC_FL_COLLAPSE_RANGE) || !defined(FALLOC_FL_ZERO_RANGE))
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# include <linux/falloc.h> /* non-libc fallback for FALLOC_FL_* flags */
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#endif
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#ifndef FALLOC_FL_KEEP_SIZE
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# define FALLOC_FL_KEEP_SIZE 1
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# define FALLOC_FL_KEEP_SIZE 0x1
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#endif
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#ifndef FALLOC_FL_PUNCH_HOLE
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# define FALLOC_FL_PUNCH_HOLE 2
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# define FALLOC_FL_PUNCH_HOLE 0x2
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#endif
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#ifndef FALLOC_FL_COLLAPSE_RANGE
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# define FALLOC_FL_COLLAPSE_RANGE 8
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# define FALLOC_FL_COLLAPSE_RANGE 0x8
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#endif
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#ifndef FALLOC_FL_ZERO_RANGE
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# define FALLOC_FL_ZERO_RANGE 0x10
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#endif
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#include "nls.h"
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@ -77,6 +81,7 @@ static void __attribute__((__noreturn__)) usage(FILE *out)
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fputs(_(" -n, --keep-size don't modify the length of the file\n"), out);
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fputs(_(" -o, --offset <num> offset of the (de)allocation, in bytes\n"), out);
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fputs(_(" -p, --punch-hole punch holes in the file\n"), out);
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fputs(_(" -z, --zero-range zeroes a range in the file\n"), out);
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fputs(_(" -v, --verbose verbose mode\n"), out);
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fputs(USAGE_SEPARATOR, out);
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@ -270,6 +275,7 @@ int main(int argc, char **argv)
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{ "punch-hole", 0, 0, 'p' },
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{ "collapse-range", 0, 0, 'c' },
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{ "dig-holes", 0, 0, 'd' },
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{ "zero-range", 0, 0, 'z' },
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{ "offset", 1, 0, 'o' },
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{ "length", 1, 0, 'l' },
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{ "verbose", 0, 0, 'v' },
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@ -281,7 +287,7 @@ int main(int argc, char **argv)
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textdomain(PACKAGE);
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atexit(close_stdout);
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while ((c = getopt_long(argc, argv, "hvVncpdl:o:", longopts, NULL))
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while ((c = getopt_long(argc, argv, "hvVncpdzl:o:", longopts, NULL))
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!= -1) {
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switch(c) {
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case 'h':
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@ -302,6 +308,9 @@ int main(int argc, char **argv)
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case 'd':
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dig = 1;
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break;
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case 'z':
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mode |= FALLOC_FL_ZERO_RANGE;
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break;
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case 'l':
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length = cvtnum(optarg);
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break;
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@ -318,7 +327,8 @@ int main(int argc, char **argv)
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}
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if (dig) {
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if (mode != 0)
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errx(EXIT_FAILURE, _("Can't use -p or -n with --dig-holes"));
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errx(EXIT_FAILURE,
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_("Can't use other modes with --dig-holes"));
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if (length == -2LL)
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length = 0;
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if (length < 0)
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@ -333,6 +343,9 @@ int main(int argc, char **argv)
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errx(EXIT_FAILURE, _("invalid offset value specified"));
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if (optind == argc)
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errx(EXIT_FAILURE, _("no filename specified."));
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if (mode & ~(FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE))
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errx(EXIT_FAILURE, _("only -n mode can be used with "
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"--zero-range"));
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filename = argv[optind++];
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