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mount: update /etc/mtab properly on mount --move

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Signed-off-by: Roman Borisov <ext-roman.borisov@nokia.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Roman Borisov
2011-02-28 05:06:01 +01:00
committed by Denys Vlasenko
parent 251962f207
commit c8dc01dc80
1 changed files with 67 additions and 9 deletions
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76
util-linux/mount.c
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@@ -279,6 +279,61 @@ enum { GETMNTENT_BUFSIZE = COMMON_BUFSIZE - offsetof(struct globals, getmntent_b
#define fslist (G.fslist )
#define getmntent_buf (G.getmntent_buf )
#if ENABLE_FEATURE_MTAB_SUPPORT
/*
* update_mtab_entry_on_move() is used to update entry in case of mount --move.
* we are looking for existing entries mnt_dir which is equal to mnt_fsname of
* input mntent and replace it by new one.
*/
static void FAST_FUNC update_mtab_entry_on_move(const struct mntent *mp)
{
struct mntent *entries, *m;
int i, count;
FILE *mountTable;
mountTable = setmntent(bb_path_mtab_file, "r");
if (!mountTable) {
bb_perror_msg(bb_path_mtab_file);
return;
}
entries = NULL;
count = 0;
while ((m = getmntent(mountTable)) != NULL) {
entries = xrealloc_vector(entries, 3, count);
entries[count].mnt_fsname = xstrdup(m->mnt_fsname);
entries[count].mnt_dir = xstrdup(m->mnt_dir);
entries[count].mnt_type = xstrdup(m->mnt_type);
entries[count].mnt_opts = xstrdup(m->mnt_opts);
entries[count].mnt_freq = m->mnt_freq;
entries[count].mnt_passno = m->mnt_passno;
count++;
}
endmntent(mountTable);
mountTable = setmntent(bb_path_mtab_file, "w");
if (mountTable) {
for (i = 0; i < count; i++) {
if (strcmp(entries[i].mnt_dir, mp->mnt_fsname) != 0)
addmntent(mountTable, &entries[i]);
else
addmntent(mountTable, mp);
}
endmntent(mountTable);
} else if (errno != EROFS)
bb_perror_msg(bb_path_mtab_file);
if (ENABLE_FEATURE_CLEAN_UP) {
for (i = 0; i < count; i++) {
free(entries[i].mnt_fsname);
free(entries[i].mnt_dir);
free(entries[i].mnt_type);
free(entries[i].mnt_opts);
}
free(entries);
}
}
#endif
#if ENABLE_FEATURE_MOUNT_VERBOSE
static int verbose_mount(const char *source, const char *target,
@@ -496,12 +551,11 @@ static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
int i;
if (!mountTable) {
bb_error_msg("no %s", bb_path_mtab_file);
bb_perror_msg(bb_path_mtab_file);
goto ret;
}
// Add vfs string flags
for (i = 0; mount_options[i] != MS_REMOUNT; i++) {
if (mount_options[i] > 0 && (mount_options[i] & vfsflags))
append_mount_options(&(mp->mnt_opts), option_str);
@@ -509,24 +563,28 @@ static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
}
// Remove trailing / (if any) from directory we mounted on
i = strlen(mp->mnt_dir) - 1;
if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = '\0';
while (i > 0 && mp->mnt_dir[i] == '/')
mp->mnt_dir[i] = '\0';
// Convert to canonical pathnames as needed
mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
fsname = 0;
fsname = NULL;
if (!mp->mnt_type || !*mp->mnt_type) { // bind mount
mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
mp->mnt_type = (char*)"bind";
}
mp->mnt_freq = mp->mnt_passno = 0;
// Write and close.
addmntent(mountTable, mp);
// Write and close
#if ENABLE_FEATURE_MTAB_SUPPORT
if (vfsflags & MS_MOVE)
update_mtab_entry_on_move(mp);
else
#endif
addmntent(mountTable, mp);
endmntent(mountTable);
if (ENABLE_FEATURE_CLEAN_UP) {
free(mp->mnt_dir);
free(fsname);