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lvresize: fix check for mounted and renamed LV to handle spaces

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Replace spaces with \040 in directory paths from getmntent (mtab).

The recent commit 5374a44c57 compares mount point directory paths
from /etc/mtab and /proc/mounts, in order to detect when a mounted
LV has been renamed.  The directory path comparison does not work
correctly when the path contains spaces because getmntent uses
ascii space chars and proc replaces spaces with \040.
This commit is contained in:
David Teigland 2023-02-23 16:32:37 -06:00
parent 86ac529b99
commit 1857eb9fe0
2 changed files with 46 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
lib/device/filesystem.c
View File

@ -234,8 +234,9 @@ int fs_mount_state_is_misnamed(struct cmd_context *cmd, struct logical_volume *l
char proc_fstype[FSTYPE_MAX];
char proc_devpath[PATH_MAX];
char proc_mntpath[PATH_MAX];
char lv_mapper_path[PATH_MAX];
char mntent_mount_dir[PATH_MAX];
char mtab_mntpath[PATH_MAX];
char dm_devpath[PATH_MAX];
char tmp_path[PATH_MAX];
char *dm_name;
struct stat st_lv;
struct stat stme;
@ -275,14 +276,36 @@ int fs_mount_state_is_misnamed(struct cmd_context *cmd, struct logical_volume *l
continue;
if (stme.st_dev != st_lv.st_rdev)
continue;
dm_strncpy(mntent_mount_dir, me->mnt_dir, sizeof(mntent_mount_dir));
dm_strncpy(mtab_mntpath, me->mnt_dir, sizeof(mtab_mntpath));
break;
}
endmntent(fme);
/*
* In mtab dir path, replace each ascii space character with the
* four characters \040 which is how /proc/mounts represents spaces.
* The mnt dir from /etc/mtab and /proc/mounts are compared below.
*/
if (strchr(mtab_mntpath, ' ')) {
int i, j = 0;
memcpy(tmp_path, mtab_mntpath, sizeof(tmp_path));
memset(mtab_mntpath, 0, sizeof(mtab_mntpath));
for (i = 0; i < sizeof(tmp_path); i++) {
if (tmp_path[i] == ' ') {
mtab_mntpath[j++] = '\\';
mtab_mntpath[j++] = '0';
mtab_mntpath[j++] = '4';
mtab_mntpath[j++] = '0';
continue;
}
mtab_mntpath[j++] = tmp_path[i];
}
}
if (!(dm_name = dm_build_dm_name(cmd->mem, lv->vg->name, lv->name, NULL)))
return_0;
if ((dm_snprintf(lv_mapper_path, sizeof(lv_mapper_path), "%s/%s", dm_dir(), dm_name) < 0))
if ((dm_snprintf(dm_devpath, sizeof(dm_devpath), "%s/%s", dm_dir(), dm_name) < 0))
return_0;
if (!(fp = fopen("/proc/mounts", "r")))
@ -296,8 +319,8 @@ int fs_mount_state_is_misnamed(struct cmd_context *cmd, struct logical_volume *l
if (strcmp(fstype, proc_fstype))
continue;
dir_match = !strcmp(mntent_mount_dir, proc_mntpath);
dev_match = !strcmp(lv_mapper_path, proc_devpath);
dir_match = !strcmp(mtab_mntpath, proc_mntpath);
dev_match = !strcmp(dm_devpath, proc_devpath);
if (dir_match)
found_dir++;
@ -306,7 +329,7 @@ int fs_mount_state_is_misnamed(struct cmd_context *cmd, struct logical_volume *l
if (dir_match != dev_match) {
log_error("LV %s mounted at %s may have been renamed (from %s).",
lv_mapper_path, proc_mntpath, proc_devpath);
dm_devpath, proc_mntpath, proc_devpath);
renamed = 1;
}
}
@ -327,11 +350,11 @@ int fs_mount_state_is_misnamed(struct cmd_context *cmd, struct logical_volume *l
}
/* These two are likely detected as renamed, but include checks in case. */
if (found_dir > 1) {
log_error("File system resizing not supported: %s appears more than once in /proc/mounts.", mntent_mount_dir);
log_error("File system resizing not supported: %s appears more than once in /proc/mounts.", mtab_mntpath);
return 1;
}
if (found_dev > 1) {
log_error("File system resizing not supported: %s appears more than once in /proc/mounts.", lv_mapper_path);
log_error("File system resizing not supported: %s appears more than once in /proc/mounts.", dm_devpath);
return 1;
}
return 0;

14
test/shell/lvresize-fs.sh
View File

@ -30,6 +30,9 @@ which mkfs.xfs || skip
mount_dir="mnt_lvresize_fs"
mkdir -p "$mount_dir"
mount_dir_space="other mnt dir"
mkdir -p "$mount_dir_space"
# Tests require a libblkid version that shows FSLASTBLOCK
lvcreate -n $lv1 -L 300 $vg
mkfs.xfs -f "$DM_DEV_DIR/$vg/$lv1"
@ -273,6 +276,17 @@ umount "$mount_dir"
lvchange -an $vg/$lv2
lvremove $vg/$lv2
# lvextend|lvreduce, ext4, active, mounted, mount dir with space, --fs resize, renamed LV
lvcreate -n $lv -L 256M $vg
mkfs.ext4 "$DM_DEV_DIR/$vg/$lv"
mount "$DM_DEV_DIR/$vg/$lv" "$mount_dir_space"
lvrename $vg/$lv $vg/$lv2
not lvextend --fs resize -L+32M $vg/$lv2
not lvreduce --fs resize -L-32M $vg/$lv2
umount "$mount_dir_space"
lvchange -an $vg/$lv2
lvremove $vg/$lv2
#
# lvextend, xfs