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Diffstat (limited to 'mount/fstab.c')
-rw-r--r--mount/fstab.c224
1 files changed, 129 insertions, 95 deletions
diff --git a/mount/fstab.c b/mount/fstab.c
index 408042c17..85a5d2df3 100644
--- a/mount/fstab.c
+++ b/mount/fstab.c
@@ -27,49 +27,49 @@ static int var_mtab_is_a_symlink = 0;
static void
get_mtab_info(void) {
- struct stat mtab_stat;
-
- if (!have_mtab_info) {
- if (lstat(MOUNTED, &mtab_stat))
- var_mtab_does_not_exist = 1;
- else if (S_ISLNK(mtab_stat.st_mode))
- var_mtab_is_a_symlink = 1;
- have_mtab_info = 1;
- }
+ struct stat mtab_stat;
+
+ if (!have_mtab_info) {
+ if (lstat(MOUNTED, &mtab_stat))
+ var_mtab_does_not_exist = 1;
+ else if (S_ISLNK(mtab_stat.st_mode))
+ var_mtab_is_a_symlink = 1;
+ have_mtab_info = 1;
+ }
}
int
mtab_does_not_exist(void) {
- get_mtab_info();
- return var_mtab_does_not_exist;
+ get_mtab_info();
+ return var_mtab_does_not_exist;
}
int
mtab_is_a_symlink(void) {
- get_mtab_info();
- return var_mtab_is_a_symlink;
+ get_mtab_info();
+ return var_mtab_is_a_symlink;
}
int
mtab_is_writable() {
- static int ret = -1;
-
- /* Should we write to /etc/mtab upon an update?
- Probably not if it is a symlink to /proc/mounts, since that
- would create a file /proc/mounts in case the proc filesystem
- is not mounted. */
- if (mtab_is_a_symlink())
- return 0;
-
- if (ret == -1) {
- int fd = open(MOUNTED, O_RDWR | O_CREAT, 0644);
- if (fd >= 0) {
- close(fd);
- ret = 1;
- } else
- ret = 0;
- }
- return ret;
+ static int ret = -1;
+
+ /* Should we write to /etc/mtab upon an update?
+ Probably not if it is a symlink to /proc/mounts, since that
+ would create a file /proc/mounts in case the proc filesystem
+ is not mounted. */
+ if (mtab_is_a_symlink())
+ return 0;
+
+ if (ret == -1) {
+ int fd = open(MOUNTED, O_RDWR | O_CREAT, 0644);
+ if (fd >= 0) {
+ close(fd);
+ ret = 1;
+ } else
+ ret = 0;
+ }
+ return ret;
}
/* Contents of mtab and fstab ---------------------------------*/
@@ -82,16 +82,16 @@ static void read_mounttable(void), read_fstab(void);
struct mntentchn *
mtab_head() {
- if (!got_mtab)
- read_mounttable();
- return &mounttable;
+ if (!got_mtab)
+ read_mounttable();
+ return &mounttable;
}
struct mntentchn *
fstab_head() {
- if (!got_fstab)
- read_fstab();
- return &fstab;
+ if (!got_fstab)
+ read_fstab();
+ return &fstab;
}
static void
@@ -100,7 +100,7 @@ read_mntentchn(mntFILE *mfp, const char *fnam, struct mntentchn *mc0) {
struct mntent *mnt;
while ((mnt = my_getmntent (mfp)) != NULL) {
- if (!streq (mnt->mnt_type, MNTTYPE_IGNORE)) {
+ if (!streq(mnt->mnt_type, MNTTYPE_IGNORE)) {
mc->nxt = (struct mntentchn *) xmalloc(sizeof(*mc));
mc->nxt->prev = mc;
mc = mc->nxt;
@@ -125,48 +125,50 @@ read_mntentchn(mntFILE *mfp, const char *fnam, struct mntentchn *mc0) {
*/
static void
read_mounttable() {
- mntFILE *mfp;
- const char *fnam;
- struct mntentchn *mc = &mounttable;
-
- got_mtab = 1;
- mc->nxt = mc->prev = NULL;
-
- fnam = MOUNTED;
- mfp = my_setmntent (fnam, "r");
- if (mfp == NULL || mfp->mntent_fp == NULL) {
- int errsv = errno;
- fnam = PROC_MOUNTS;
- mfp = my_setmntent (fnam, "r");
- if (mfp == NULL || mfp->mntent_fp == NULL) {
- error(_("warning: can't open %s: %s"), MOUNTED, strerror (errsv));
- return;
- }
- if (verbose)
- printf (_("mount: could not open %s - using %s instead\n"),
- MOUNTED, PROC_MOUNTS);
- }
- read_mntentchn(mfp, fnam, mc);
+ mntFILE *mfp;
+ const char *fnam;
+ struct mntentchn *mc = &mounttable;
+
+ got_mtab = 1;
+ mc->nxt = mc->prev = NULL;
+
+ fnam = MOUNTED;
+ mfp = my_setmntent (fnam, "r");
+ if (mfp == NULL || mfp->mntent_fp == NULL) {
+ int errsv = errno;
+ fnam = PROC_MOUNTS;
+ mfp = my_setmntent (fnam, "r");
+ if (mfp == NULL || mfp->mntent_fp == NULL) {
+ error(_("warning: can't open %s: %s"),
+ MOUNTED, strerror (errsv));
+ return;
+ }
+ if (verbose)
+ printf (_("mount: could not open %s - "
+ "using %s instead\n"),
+ MOUNTED, PROC_MOUNTS);
+ }
+ read_mntentchn(mfp, fnam, mc);
}
static void
read_fstab() {
- mntFILE *mfp = NULL;
- const char *fnam;
- struct mntentchn *mc = &fstab;
-
- got_fstab = 1;
- mc->nxt = mc->prev = NULL;
-
- fnam = _PATH_FSTAB;
- mfp = my_setmntent (fnam, "r");
- if (mfp == NULL || mfp->mntent_fp == NULL) {
- int errsv = errno;
- error(_("warning: can't open %s: %s"),
- _PATH_FSTAB, strerror (errsv));
- return;
- }
- read_mntentchn(mfp, fnam, mc);
+ mntFILE *mfp = NULL;
+ const char *fnam;
+ struct mntentchn *mc = &fstab;
+
+ got_fstab = 1;
+ mc->nxt = mc->prev = NULL;
+
+ fnam = _PATH_FSTAB;
+ mfp = my_setmntent (fnam, "r");
+ if (mfp == NULL || mfp->mntent_fp == NULL) {
+ int errsv = errno;
+ error(_("warning: can't open %s: %s"),
+ _PATH_FSTAB, strerror (errsv));
+ return;
+ }
+ read_mntentchn(mfp, fnam, mc);
}
@@ -177,30 +179,62 @@ getmntfile (const char *name) {
mc0 = mtab_head();
for (mc = mc0->nxt; mc && mc != mc0; mc = mc->nxt)
- if (streq (mc->m.mnt_dir, name) ||
- streq (mc->m.mnt_fsname, name))
+ if (streq(mc->m.mnt_dir, name) ||
+ streq(mc->m.mnt_fsname, name))
return mc;
return NULL;
}
/*
- * Given the name NAME, and the place MCPREV we found it last time,
+ * Given the directory name NAME, and the place MCPREV we found it last time,
* try to find more occurrences.
*/
struct mntentchn *
-getmntfilesbackward (const char *name, struct mntentchn *mcprev) {
+getmntdirbackward (const char *name, struct mntentchn *mcprev) {
struct mntentchn *mc, *mc0;
mc0 = mtab_head();
if (!mcprev)
mcprev = mc0;
for (mc = mcprev->prev; mc && mc != mc0; mc = mc->prev)
- if (streq (mc->m.mnt_dir, name) ||
- streq (mc->m.mnt_fsname, name))
+ if (streq(mc->m.mnt_dir, name))
return mc;
return NULL;
}
+/*
+ * Given the device name NAME, and the place MCPREV we found it last time,
+ * try to find more occurrences.
+ */
+struct mntentchn *
+getmntdevbackward (const char *name, struct mntentchn *mcprev) {
+ struct mntentchn *mc, *mc0;
+
+ mc0 = mtab_head();
+ if (!mcprev)
+ mcprev = mc0;
+ for (mc = mcprev->prev; mc && mc != mc0; mc = mc->prev)
+ if (streq(mc->m.mnt_fsname, name))
+ return mc;
+ return NULL;
+}
+
+/*
+ * Given the name NAME, check that it occurs precisely once as dir or dev.
+ */
+int
+is_mounted_once(const char *name) {
+ struct mntentchn *mc, *mc0;
+ int ct = 0;
+
+ mc0 = mtab_head();
+ for (mc = mc0->prev; mc && mc != mc0; mc = mc->prev)
+ if (streq(mc->m.mnt_dir, name) ||
+ streq(mc->m.mnt_fsname, name))
+ ct++;
+ return (ct == 1);
+}
+
/* Given the name FILE, try to find the option "loop=FILE" in mtab. */
struct mntentchn *
getmntoptfile (const char *file) {
@@ -251,29 +285,29 @@ getfsspecfile (const char *spec, const char *file) {
/* first attempt: names occur precisely as given */
for (mc = mc0->nxt; mc && mc != mc0; mc = mc->nxt)
- if (streq (mc->m.mnt_dir, file) &&
- streq (mc->m.mnt_fsname, spec))
+ if (streq(mc->m.mnt_dir, file) &&
+ streq(mc->m.mnt_fsname, spec))
return mc;
/* second attempt: names found after symlink resolution */
for (mc = mc0->nxt; mc && mc != mc0; mc = mc->nxt)
- if ((streq (mc->m.mnt_dir, file) ||
- streq (canonicalize(mc->m.mnt_dir), file))
- && (streq (mc->m.mnt_fsname, spec) ||
- streq (canonicalize(mc->m.mnt_fsname), spec)))
+ if ((streq(mc->m.mnt_dir, file) ||
+ streq(canonicalize(mc->m.mnt_dir), file))
+ && (streq(mc->m.mnt_fsname, spec) ||
+ streq(canonicalize(mc->m.mnt_fsname), spec)))
return mc;
/* third attempt: names found after LABEL= or UUID= resolution */
for (mc = mc0->nxt; mc && mc != mc0; mc = mc->nxt) {
if (!strncmp (mc->m.mnt_fsname, "LABEL=", 6) &&
- (streq (mc->m.mnt_dir, file) ||
- streq (canonicalize(mc->m.mnt_dir), file))) {
+ (streq(mc->m.mnt_dir, file) ||
+ streq(canonicalize(mc->m.mnt_dir), file))) {
if (has_label(spec, mc->m.mnt_fsname+6))
return mc;
}
if (!strncmp (mc->m.mnt_fsname, "UUID=", 5) &&
- (streq (mc->m.mnt_dir, file) ||
- streq (canonicalize(mc->m.mnt_dir), file))) {
+ (streq(mc->m.mnt_dir, file) ||
+ streq(canonicalize(mc->m.mnt_dir), file))) {
if (has_uuid(spec, mc->m.mnt_fsname+5))
return mc;
}
@@ -288,7 +322,7 @@ getfsfile (const char *file) {
mc0 = fstab_head();
for (mc = mc0->nxt; mc && mc != mc0; mc = mc->nxt)
- if (streq (mc->m.mnt_dir, file))
+ if (streq(mc->m.mnt_dir, file))
return mc;
return NULL;
}
@@ -300,7 +334,7 @@ getfsspec (const char *spec) {
mc0 = fstab_head();
for (mc = mc0->nxt; mc && mc != mc0; mc = mc->nxt)
- if (streq (mc->m.mnt_fsname, spec))
+ if (streq(mc->m.mnt_fsname, spec))
return mc;
return NULL;
}
@@ -529,7 +563,7 @@ update_mtab (const char *dir, struct mntent *instead) {
/* find last occurrence of dir */
for (mc = mc0->prev; mc && mc != mc0; mc = mc->prev)
- if (streq (mc->m.mnt_dir, dir))
+ if (streq(mc->m.mnt_dir, dir))
break;
if (mc && mc != mc0) {
if (instead == NULL) {
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-10 14:10:29 +0200