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util-linux/util-linux-fsck-l-option.patch

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fsck: add support for whole-disk locking (-l option)
This feature allows to call multiple independent fsck instances rather
than use only one "fsck -A" process.
The lock uses LOCK_EX flock(2). The lock request is ignored if the
whole-disk is non-rotating disk. The verbose mode (-V) provides
information about disk locking.
Note that "fsck -l" does not care if the device is stacked, for
example if you want to call "fsck -l /dev/md0" and "fsck -l /dev/md1"
then the underlying devices will not be locked. The traditional "fsck
-A" does not run in parallel for stacked devices.
http://pkgs.fedoraproject.org/gitweb/?p=util-linux-ng.git;a=commitdiff;h=6c69926dbfca8b07bd2f93b56bc8e7c54c7b227d#patch1
diff -up util-linux-ng-2.18/fsck/fsck.8.kzak util-linux-ng-2.18/fsck/fsck.8
--- util-linux-ng-2.18/fsck/fsck.8.kzak 2010-06-30 12:51:35.000000000 +0200
+++ util-linux-ng-2.18/fsck/fsck.8 2010-10-26 23:55:30.000000000 +0200
@@ -7,7 +7,7 @@
fsck \- check and repair a Linux file system
.SH SYNOPSIS
.B fsck
-.RB [ \-sAVRTMNP ]
+.RB [ \-lsAVRTMNP ]
.RB [ \-C
.RI [ fd ]]
.RB [ \-t
@@ -80,6 +80,17 @@ variable. Please see the file system-sp
further details.
.SH OPTIONS
.TP
+.B \-l
+Lock whole-disk device by exclusive
+.BR flock (2).
+This option can be used with one device only (e.g. -A and -l are mutually
+exclusive). This option is recommended when more
+.B fsck (8)
+instances are executed in the same time. The option is ignored when used for
+multiple devices or for non-rotating disk. The fsck does not lock underlying
+devices if executed to check stacked devices (e.g. MD or DM) -- this feature is
+not implemented yet.
+.TP
.B \-s
Serialize
.B fsck
@@ -200,6 +211,11 @@ If there are multiple filesystems with t
fsck will attempt to check them in parallel, although it will avoid running
multiple filesystem checks on the same physical disk.
.sp
+.B fsck
+does not check stacked devices (RAIDs, dm-crypt, ...) in parallel with any other
+device. See below for FSCK_FORCE_ALL_PARALLEL setting. The /sys filesystem is
+used to detemine dependencies between devices.
+.sp
Hence, a very common configuration in
.I /etc/fstab
files is to set the root filesystem to have a
@@ -366,10 +382,10 @@ program's behavior is affected by the fo
.B FSCK_FORCE_ALL_PARALLEL
If this environment variable is set,
.B fsck
-will attempt to run all of the specified filesystems in parallel,
-regardless of whether the filesystems appear to be on the same
-device. (This is useful for RAID systems or high-end storage systems
-such as those sold by companies such as IBM or EMC.)
+will attempt to run all of the specified filesystems in parallel, regardless of
+whether the filesystems appear to be on the same device. (This is useful for
+RAID systems or high-end storage systems such as those sold by companies such
+as IBM or EMC.) Note that the fs_passno value is still used.
.TP
.B FSCK_MAX_INST
This environment variable will limit the maximum number of file system
diff -up util-linux-ng-2.18/fsck/fsck.c.kzak util-linux-ng-2.18/fsck/fsck.c
--- util-linux-ng-2.18/fsck/fsck.c.kzak 2010-05-19 23:36:23.000000000 +0200
+++ util-linux-ng-2.18/fsck/fsck.c 2010-10-26 23:55:30.000000000 +0200
@@ -31,6 +31,8 @@
#include <sys/wait.h>
#include <sys/signal.h>
#include <sys/stat.h>
+#include <sys/file.h>
+#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <ctype.h>
@@ -42,6 +44,8 @@
#include <errno.h>
#include <malloc.h>
#include <signal.h>
+#include <dirent.h>
+#include <blkid.h>
#include "fsprobe.h"
@@ -85,6 +89,7 @@ char *devices[MAX_DEVICES];
char *args[MAX_ARGS];
int num_devices, num_args;
+int lockdisk = 0;
int verbose = 0;
int doall = 0;
int noexecute = 0;
@@ -214,11 +219,97 @@ static void parse_escape(char *word)
*q = 0;
}
+static dev_t get_disk(const char *device)
+{
+ struct stat st;
+ dev_t disk;
+
+ if (!stat(device, &st) &&
+ !blkid_devno_to_wholedisk(st.st_rdev, NULL, 0, &disk))
+ return disk;
+
+ return 0;
+}
+
+static int is_irrotational_disk(dev_t disk)
+{
+ char path[PATH_MAX];
+ FILE *f;
+ int rc, x;
+
+ rc = snprintf(path, sizeof(path),
+ "/sys/dev/block/%d:%d/queue/rotational",
+ major(disk), minor(disk));
+
+ if (rc < 0 || rc + 1 > sizeof(path))
+ return 0;
+
+ f = fopen(path, "r");
+ if (!f)
+ return 0;
+
+ rc = fscanf(f, "%u", &x);
+ fclose(f);
+
+ return rc == 1 ? !x : 0;
+}
+
+static void lock_disk(struct fsck_instance *inst)
+{
+ dev_t disk = inst->fs->disk ? : get_disk(inst->fs->device);
+ char *diskname;
+
+ if (!disk || is_irrotational_disk(disk))
+ return;
+
+ diskname = blkid_devno_to_devname(disk);
+ if (!diskname)
+ return;
+
+ if (verbose)
+ printf(_("Locking disk %s ... "), diskname);
+
+ inst->lock = open(diskname, O_CLOEXEC | O_RDONLY);
+ if (inst->lock >= 0) {
+ int rc = -1;
+
+ /* inform users that we're waiting on the lock */
+ if (verbose &&
+ (rc = flock(inst->lock, LOCK_EX | LOCK_NB)) != 0 &&
+ errno == EWOULDBLOCK)
+ printf(_("(waiting) "));
+
+ if (rc != 0 && flock(inst->lock, LOCK_EX) != 0) {
+ close(inst->lock); /* failed */
+ inst->lock = -1;
+ }
+ }
+
+ if (verbose)
+ printf("%s.\n", inst->lock >= 0 ? _("success") : _("failed"));
+
+ free(diskname);
+ return;
+}
+
+static void unlock_disk(struct fsck_instance *inst)
+{
+ if (inst->lock >= 0) {
+ /* explicitly unlock, don't rely on close(), maybe some library
+ * (e.g. liblkid) has still open the device.
+ */
+ flock(inst->lock, LOCK_UN);
+ close(inst->lock);
+ }
+}
+
+
+
static void free_instance(struct fsck_instance *i)
{
+ if (lockdisk)
+ unlock_disk(i);
free(i->prog);
- free(i->device);
- free(i->base_device);
free(i);
return;
}
@@ -240,6 +331,8 @@ static struct fs_info *create_fs_device(
fs->passno = passno;
fs->flags = 0;
fs->next = NULL;
+ fs->disk = 0;
+ fs->stacked = 0;
if (!filesys_info)
filesys_info = fs;
@@ -414,8 +507,7 @@ static int progress_active(NOARGS)
* Execute a particular fsck program, and link it into the list of
* child processes we are waiting for.
*/
-static int execute(const char *type, const char *device, const char *mntpt,
- int interactive)
+static int execute(const char *type, struct fs_info *fs, int interactive)
{
char *s, *argv[80], prog[80];
int argc, i;
@@ -452,7 +544,7 @@ static int execute(const char *type, con
}
}
- argv[argc++] = string_copy(device);
+ argv[argc++] = string_copy(fs->device);
argv[argc] = 0;
s = find_fsck(prog);
@@ -464,12 +556,19 @@ static int execute(const char *type, con
if (verbose || noexecute) {
printf("[%s (%d) -- %s] ", s, num_running,
- mntpt ? mntpt : device);
+ fs->mountpt ? fs->mountpt : fs->device);
for (i=0; i < argc; i++)
printf("%s ", argv[i]);
printf("\n");
}
+
+ inst->fs = fs;
+ inst->lock = -1;
+
+ if (lockdisk)
+ lock_disk(inst);
+
/* Fork and execute the correct program. */
if (noexecute)
pid = -1;
@@ -492,8 +591,6 @@ static int execute(const char *type, con
inst->pid = pid;
inst->prog = string_copy(prog);
inst->type = string_copy(type);
- inst->device = string_copy(device);
- inst->base_device = base_device(device);
inst->start_time = time(0);
inst->next = NULL;
@@ -597,12 +694,12 @@ static struct fsck_instance *wait_one(in
} else {
printf(_("Warning... %s for device %s exited "
"with signal %d.\n"),
- inst->prog, inst->device, sig);
+ inst->prog, inst->fs->device, sig);
status = EXIT_ERROR;
}
} else {
printf(_("%s %s: status is %x, should never happen.\n"),
- inst->prog, inst->device, status);
+ inst->prog, inst->fs->device, status);
status = EXIT_ERROR;
}
inst->exit_status = status;
@@ -641,7 +738,7 @@ ret_inst:
instance_list = inst->next;
if (verbose > 1)
printf(_("Finished with %s (exit status %d)\n"),
- inst->device, inst->exit_status);
+ inst->fs->device, inst->exit_status);
num_running--;
return inst;
}
@@ -698,7 +795,7 @@ static void fsck_device(struct fs_info *
type = DEFAULT_FSTYPE;
num_running++;
- retval = execute(type, fs->device, fs->mountpt, interactive);
+ retval = execute(type, fs, interactive);
if (retval) {
fprintf(stderr, _("%s: Error %d while executing fsck.%s "
"for %s\n"), progname, retval, type, fs->device);
@@ -924,40 +1021,70 @@ static int ignore(struct fs_info *fs)
return 0;
}
+static int count_slaves(dev_t disk)
+{
+ DIR *dir;
+ struct dirent *dp;
+ char dirname[PATH_MAX];
+ int count = 0;
+
+ snprintf(dirname, sizeof(dirname),
+ "/sys/dev/block/%u:%u/slaves/",
+ major(disk), minor(disk));
+
+ if (!(dir = opendir(dirname)))
+ return -1;
+
+ while ((dp = readdir(dir)) != 0) {
+#ifdef _DIRENT_HAVE_D_TYPE
+ if (dp->d_type != DT_UNKNOWN && dp->d_type != DT_LNK)
+ continue;
+#endif
+ if (dp->d_name[0] == '.' &&
+ ((dp->d_name[1] == 0) ||
+ ((dp->d_name[1] == '.') && (dp->d_name[2] == 0))))
+ continue;
+
+ count++;
+ }
+ closedir(dir);
+ return count;
+}
+
/*
* Returns TRUE if a partition on the same disk is already being
* checked.
*/
-static int device_already_active(char *device)
+static int disk_already_active(struct fs_info *fs)
{
struct fsck_instance *inst;
- char *base;
if (force_all_parallel)
return 0;
-#ifdef BASE_MD
- /* Don't check a soft raid disk with any other disk */
- if (instance_list &&
- (!strncmp(instance_list->device, BASE_MD, sizeof(BASE_MD)-1) ||
- !strncmp(device, BASE_MD, sizeof(BASE_MD)-1)))
+ if (instance_list && instance_list->fs->stacked)
+ /* any instance for a stacked device is already running */
return 1;
-#endif
- base = base_device(device);
+ if (!fs->disk) {
+ fs->disk = get_disk(fs->device);
+ if (fs->disk)
+ fs->stacked = count_slaves(fs->disk);
+ }
+
/*
* If we don't know the base device, assume that the device is
* already active if there are any fsck instances running.
+ *
+ * Don't check a stacked device with any other disk too.
*/
- if (!base)
+ if (!fs->disk || fs->stacked)
return (instance_list != 0);
+
for (inst = instance_list; inst; inst = inst->next) {
- if (!inst->base_device || !strcmp(base, inst->base_device)) {
- free(base);
+ if (!inst->fs->disk || fs->disk == inst->fs->disk)
return 1;
- }
}
- free(base);
return 0;
}
@@ -1038,7 +1165,7 @@ static int check_all(NOARGS)
* already been spawned, then we need to defer
* this to another pass.
*/
- if (device_already_active(fs->device)) {
+ if (disk_already_active(fs)) {
pass_done = 0;
continue;
}
@@ -1188,6 +1315,9 @@ static void PRS(int argc, char *argv[])
}
}
break;
+ case 'l':
+ lockdisk++;
+ break;
case 'V':
verbose++;
break;
@@ -1298,6 +1428,12 @@ int main(int argc, char *argv[])
if ((num_devices == 1) || (serialize))
interactive = 1;
+ if (lockdisk && (doall || num_devices > 1)) {
+ fprintf(stderr, _("%s: the -l option can be used with one "
+ "device only -- ignore\n"), progname);
+ lockdisk = 0;
+ }
+
/* If -A was specified ("check all"), do that! */
if (doall)
return check_all();
diff -up util-linux-ng-2.18/fsck/fsck.h.kzak util-linux-ng-2.18/fsck/fsck.h
--- util-linux-ng-2.18/fsck/fsck.h.kzak 2010-03-18 23:11:23.000000000 +0100
+++ util-linux-ng-2.18/fsck/fsck.h 2010-10-26 23:55:30.000000000 +0200
@@ -44,6 +44,8 @@ struct fs_info {
int freq;
int passno;
int flags;
+ dev_t disk;
+ int stacked;
struct fs_info *next;
};
@@ -56,12 +58,12 @@ struct fs_info {
struct fsck_instance {
int pid;
int flags;
+ int lock; /* flock()ed whole disk file descriptor or -1 */
int exit_status;
time_t start_time;
char * prog;
char * type;
- char * device;
- char * base_device;
+ struct fs_info *fs;
struct fsck_instance *next;
};
diff -up util-linux-ng-2.18/fsck/Makefile.am.kzak util-linux-ng-2.18/fsck/Makefile.am
--- util-linux-ng-2.18/fsck/Makefile.am.kzak 2010-05-24 12:33:46.000000000 +0200
+++ util-linux-ng-2.18/fsck/Makefile.am 2010-10-26 23:55:30.000000000 +0200
@@ -3,7 +3,7 @@ include $(top_srcdir)/config/include-Mak
sbin_PROGRAMS = fsck
dist_man_MANS = fsck.8
-fsck_SOURCES = base_device.c fsck.c fsck.h $(top_srcdir)/lib/ismounted.c \
+fsck_SOURCES = fsck.c fsck.h $(top_srcdir)/lib/ismounted.c \
$(top_srcdir)/lib/fsprobe.c $(top_srcdir)/lib/canonicalize.c
fsck_LDADD =
fsck_CFLAGS = $(AM_CFLAGS)
diff -up util-linux-ng-2.18/fsck/Makefile.in.kzak util-linux-ng-2.18/fsck/Makefile.in
--- util-linux-ng-2.18/fsck/Makefile.in.kzak 2010-10-26 23:56:04.000000000 +0200
+++ util-linux-ng-2.18/fsck/Makefile.in 2010-10-26 23:56:15.000000000 +0200
@@ -62,9 +62,8 @@ CONFIG_CLEAN_FILES =
CONFIG_CLEAN_VPATH_FILES =
am__installdirs = "$(DESTDIR)$(sbindir)" "$(DESTDIR)$(man8dir)"
PROGRAMS = $(sbin_PROGRAMS)
-am_fsck_OBJECTS = fsck-base_device.$(OBJEXT) fsck-fsck.$(OBJEXT) \
- fsck-ismounted.$(OBJEXT) fsck-fsprobe.$(OBJEXT) \
- fsck-canonicalize.$(OBJEXT)
+am_fsck_OBJECTS = fsck-fsck.$(OBJEXT) fsck-ismounted.$(OBJEXT) \
+ fsck-fsprobe.$(OBJEXT) fsck-canonicalize.$(OBJEXT)
fsck_OBJECTS = $(am_fsck_OBJECTS)
am__DEPENDENCIES_1 =
@BUILD_LIBBLKID_FALSE@am__DEPENDENCIES_2 = $(am__DEPENDENCIES_1)
@@ -204,6 +203,7 @@ PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
PACKAGE_NAME = @PACKAGE_NAME@
PACKAGE_STRING = @PACKAGE_STRING@
PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
PACKAGE_VERSION = @PACKAGE_VERSION@
PATH_SEPARATOR = @PATH_SEPARATOR@
PERL = @PERL@
@@ -315,7 +315,7 @@ ul_libmount_la = $(top_builddir)/shlibs/
# mount.h is generated by ./configure script and stored in build directory
ul_libmount_incdir = $(ul_libmount_builddir)
dist_man_MANS = fsck.8
-fsck_SOURCES = base_device.c fsck.c fsck.h $(top_srcdir)/lib/ismounted.c \
+fsck_SOURCES = fsck.c fsck.h $(top_srcdir)/lib/ismounted.c \
$(top_srcdir)/lib/fsprobe.c $(top_srcdir)/lib/canonicalize.c
fsck_LDADD = $(am__append_1) $(am__append_3)
@@ -407,7 +407,6 @@ mostlyclean-compile:
distclean-compile:
-rm -f *.tab.c
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fsck-base_device.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fsck-canonicalize.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fsck-fsck.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/fsck-fsprobe.Po@am__quote@
@@ -437,22 +436,6 @@ distclean-compile:
@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@ $(LTCOMPILE) -c -o $@ $<
-fsck-base_device.o: base_device.c
-@am__fastdepCC_TRUE@ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(fsck_CFLAGS) $(CFLAGS) -MT fsck-base_device.o -MD -MP -MF $(DEPDIR)/fsck-base_device.Tpo -c -o fsck-base_device.o `test -f 'base_device.c' || echo '$(srcdir)/'`base_device.c
-@am__fastdepCC_TRUE@ $(AM_V_at)$(am__mv) $(DEPDIR)/fsck-base_device.Tpo $(DEPDIR)/fsck-base_device.Po
-@am__fastdepCC_FALSE@ $(AM_V_CC) @AM_BACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@ source='base_device.c' object='fsck-base_device.o' libtool=no @AMDEPBACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@ $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(fsck_CFLAGS) $(CFLAGS) -c -o fsck-base_device.o `test -f 'base_device.c' || echo '$(srcdir)/'`base_device.c
-
-fsck-base_device.obj: base_device.c
-@am__fastdepCC_TRUE@ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(fsck_CFLAGS) $(CFLAGS) -MT fsck-base_device.obj -MD -MP -MF $(DEPDIR)/fsck-base_device.Tpo -c -o fsck-base_device.obj `if test -f 'base_device.c'; then $(CYGPATH_W) 'base_device.c'; else $(CYGPATH_W) '$(srcdir)/base_device.c'; fi`
-@am__fastdepCC_TRUE@ $(AM_V_at)$(am__mv) $(DEPDIR)/fsck-base_device.Tpo $(DEPDIR)/fsck-base_device.Po
-@am__fastdepCC_FALSE@ $(AM_V_CC) @AM_BACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@ source='base_device.c' object='fsck-base_device.obj' libtool=no @AMDEPBACKSLASH@
-@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@ $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(fsck_CFLAGS) $(CFLAGS) -c -o fsck-base_device.obj `if test -f 'base_device.c'; then $(CYGPATH_W) 'base_device.c'; else $(CYGPATH_W) '$(srcdir)/base_device.c'; fi`
-
fsck-fsck.o: fsck.c
@am__fastdepCC_TRUE@ $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(fsck_CFLAGS) $(CFLAGS) -MT fsck-fsck.o -MD -MP -MF $(DEPDIR)/fsck-fsck.Tpo -c -o fsck-fsck.o `test -f 'fsck.c' || echo '$(srcdir)/'`fsck.c
@am__fastdepCC_TRUE@ $(AM_V_at)$(am__mv) $(DEPDIR)/fsck-fsck.Tpo $(DEPDIR)/fsck-fsck.Po
diff -up util-linux-ng-2.18/Makefile.am.kzak util-linux-ng-2.18/Makefile.am
--- util-linux-ng-2.18/Makefile.am.kzak 2010-03-18 23:11:23.000000000 +0100
+++ util-linux-ng-2.18/Makefile.am 2010-10-26 23:55:30.000000000 +0200
@@ -30,8 +30,10 @@ SUBDIRS += mount
endif
if BUILD_FSCK
+if BUILD_LIBBLKID
SUBDIRS += fsck
endif
+endif
ACLOCAL_AMFLAGS = -I m4
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