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author | Karel Zak | 2014-11-07 12:08:11 +0100 |
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committer | Karel Zak | 2014-11-07 12:08:11 +0100 |
commit | 52f2fd9bcc9bbc2a0234114f11870d943de76652 (patch) | |
tree | 689eb0c96752dd9dc70612455c8db1d11d3717b8 /sys-utils/swapoff.c | |
parent | fdisk: fix and improve -l warnings (diff) | |
download | kernel-qcow2-util-linux-52f2fd9bcc9bbc2a0234114f11870d943de76652.tar.gz kernel-qcow2-util-linux-52f2fd9bcc9bbc2a0234114f11870d943de76652.tar.xz kernel-qcow2-util-linux-52f2fd9bcc9bbc2a0234114f11870d943de76652.zip |
swapoff: swapoff swap files by LABEL and UUID
# swapon --show=NAME,UUID
NAME UUID
/dev/sda3 8d52fca3-bf48-41d6-b826-2315e518a305
/home/fs-images/2g.img 6fa72b96-b802-441f-a31c-091d65c0212c
# swapoff UUID=6fa72b96-b802-441f-a31c-091d65c0212c
swapoff: cannot find the device for UUID=6fa72b96-b802-441f-a31c-091d65c0212c
Reported-by: Sami Kerola <kerolasa@iki.fi>
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'sys-utils/swapoff.c')
-rw-r--r-- | sys-utils/swapoff.c | 74 |
1 files changed, 63 insertions, 11 deletions
diff --git a/sys-utils/swapoff.c b/sys-utils/swapoff.c index 182ce9592..b725462eb 100644 --- a/sys-utils/swapoff.c +++ b/sys-utils/swapoff.c @@ -8,8 +8,10 @@ #include "nls.h" #include "c.h" +#include "xalloc.h" #include "closestream.h" +#include "swapprober.h" #include "swapon-common.h" #ifndef SWAPON_HAS_TWO_ARGS @@ -24,6 +26,58 @@ static int all; #define QUIET 1 #define CANONIC 1 +/* + * This function works like mnt_resolve_tag(), but it's able to read UUiD/LABEL + * from regular swap files too (according to entries in /proc/swaps). Note that + * mnt_resolve_tag() and mnt_resolve_spec() works with system visible block + * devices only. + */ +static char *swapoff_resolve_tag(const char *name, const char *value, + struct libmnt_cache *cache) +{ + char *path; + struct libmnt_table *tb; + struct libmnt_iter *itr; + struct libmnt_fs *fs; + + /* this is usual case for block devices (and it's really fast as it uses + * udev /dev/disk/by-* symlinks by default */ + path = mnt_resolve_tag(name, value, cache); + if (path) + return path; + + /* try regular files from /proc/swaps */ + tb = get_swaps(); + if (!tb) + return NULL; + + itr = mnt_new_iter(MNT_ITER_BACKWARD); + if (!itr) + err(EXIT_FAILURE, _("failed to initialize libmount iterator")); + + while (tb && mnt_table_next_fs(tb, itr, &fs) == 0) { + blkid_probe pr = NULL; + const char *src = mnt_fs_get_source(fs); + const char *type = mnt_fs_get_swaptype(fs); + const char *data = NULL; + + if (!src || !type || strcmp(type, "file") != 0) + continue; + pr = get_swap_prober(src); + if (!pr) + continue; + blkid_probe_lookup_value(pr, name, &data, NULL); + if (data && strcmp(data, value) == 0) + path = xstrdup(src); + blkid_free_probe(pr); + if (path) + break; + } + + mnt_free_iter(itr); + return path; +} + static int do_swapoff(const char *orig_special, int quiet, int canonic) { const char *special = orig_special; @@ -32,7 +86,11 @@ static int do_swapoff(const char *orig_special, int quiet, int canonic) printf(_("swapoff %s\n"), orig_special); if (!canonic) { + char *n, *v; + special = mnt_resolve_spec(orig_special, mntcache); + if (!special && blkid_parse_tag_string(orig_special, &n, &v) == 0) + special = swapoff_resolve_tag(n, v, mntcache); if (!special) return cannot_find(orig_special); } @@ -49,16 +107,10 @@ static int do_swapoff(const char *orig_special, int quiet, int canonic) return -1; } -static int swapoff_by_label(const char *label, int quiet) -{ - const char *special = mnt_resolve_tag("LABEL", label, mntcache); - return special ? do_swapoff(special, quiet, CANONIC) : cannot_find(label); -} - -static int swapoff_by_uuid(const char *uuid, int quiet) +static int swapoff_by(const char *name, const char *value, int quiet) { - const char *special = mnt_resolve_tag("UUID", uuid, mntcache); - return special ? do_swapoff(special, quiet, CANONIC) : cannot_find(uuid); + const char *special = swapoff_resolve_tag(name, value, mntcache); + return special ? do_swapoff(special, quiet, CANONIC) : cannot_find(value); } static void __attribute__ ((__noreturn__)) usage(FILE * out) @@ -178,10 +230,10 @@ int main(int argc, char *argv[]) mntcache = mnt_new_cache(); for (i = 0; i < numof_labels(); i++) - status |= swapoff_by_label(get_label(i), !QUIET); + status |= swapoff_by("LABEL", get_label(i), !QUIET); for (i = 0; i < numof_uuids(); i++) - status |= swapoff_by_uuid(get_uuid(i), !QUIET); + status |= swapoff_by("UUID", get_uuid(i), !QUIET); while (*argv != NULL) status |= do_swapoff(*argv++, !QUIET, !CANONIC); |