static int tabdiff_reset(struct libmnt_tabdiff *df)
{
assert(df);
DBG(DIFF, ul_debugobj(df, "resetting"));
/* zeroize all entries and move them to the list of unused
*/
while (!list_empty(&df->changes)) {
struct tabdiff_entry *de = list_entry(df->changes.next,
struct tabdiff_entry, changes);
list_del(&de->changes);
list_add_tail(&de->changes, &df->unused);
mnt_unref_fs(de->new_fs);
mnt_unref_fs(de->old_fs);
de->new_fs = de->old_fs = NULL;
de->oper = 0;
}
df->nchanges = 0;
return 0;
}
static void free_tabdiff_entry(struct tabdiff_entry *de)
{
if (!de)
return;
list_del(&de->changes);
mnt_unref_fs(de->new_fs);
mnt_unref_fs(de->old_fs);
free(de);
}
static struct libmnt_fs *add_dummy_fs(const char *device)
{
struct libmnt_fs *fs = mnt_new_fs();
if (fs && mnt_fs_set_source(fs, device) == 0 &&
mnt_table_add_fs(fstab, fs) == 0) {
mnt_unref_fs(fs);
return fs;
}
mnt_unref_fs(fs);
err(FSCK_EX_ERROR, _("failed to setup description for %s"), device);
}
/**
* mnt_table_parse_stream:
* @tb: tab pointer
* @f: file stream
* @filename: filename used for debug and error messages
*
* Returns: 0 on success, negative number in case of error.
*/
int mnt_table_parse_stream(struct libmnt_table *tb, FILE *f, const char *filename)
{
int nlines = 0;
int rc = -1;
int flags = 0;
pid_t tid = -1;
assert(tb);
assert(f);
assert(filename);
DBG(TAB, mnt_debug_h(tb, "%s: start parsing [entries=%d, filter=%s]",
filename, mnt_table_get_nents(tb),
tb->fltrcb ? "yes" : "not"));
/* necessary for /proc/mounts only, the /proc/self/mountinfo
* parser sets the flag properly
*/
if (filename && strcmp(filename, _PATH_PROC_MOUNTS) == 0)
flags = MNT_FS_KERNEL;
while (!feof(f)) {
struct libmnt_fs *fs = mnt_new_fs();
if (!fs)
goto err;
rc = mnt_table_parse_next(tb, f, fs, filename, &nlines);
if (!rc && tb->fltrcb && tb->fltrcb(fs, tb->fltrcb_data))
rc = 1; /* filtered out by callback... */
if (!rc) {
rc = mnt_table_add_fs(tb, fs);
fs->flags |= flags;
if (rc == 0 && tb->fmt == MNT_FMT_MOUNTINFO)
rc = kernel_fs_postparse(tb, fs, &tid, filename);
}
mnt_unref_fs(fs);
if (rc) {
if (rc == 1)
continue; /* recoverable error */
if (feof(f))
break;
goto err; /* fatal error */
}
}
DBG(TAB, mnt_debug_h(tb, "%s: stop parsing (%d entries)",
filename, mnt_table_get_nents(tb)));
return 0;
err:
DBG(TAB, mnt_debug_h(tb, "%s: parse error (rc=%d)", filename, rc));
return rc;
}
static void free_instance(struct fsck_instance *i)
{
if (lockdisk)
unlock_disk(i);
free(i->prog);
mnt_unref_fs(i->fs);
free(i);
return;
}
/**
* mnt_table_remove_fs:
* @tb: tab pointer
* @fs: new entry
*
* Removes the @fs from the table and de-increment reference counter of the @fs. The
* filesystem with zero reference counter will be deallocated. Don't forget to use
* mnt_ref_fs() before call mnt_table_remove_fs() if you want to use @fs later.
*
* Returns: 0 on success or negative number in case of error.
*/
int mnt_table_remove_fs(struct libmnt_table *tb, struct libmnt_fs *fs)
{
if (!tb || !fs)
return -EINVAL;
list_del(&fs->ents);
INIT_LIST_HEAD(&fs->ents); /* otherwise FS still points to the list */
mnt_unref_fs(fs);
tb->nents--;
return 0;
}
/**
* mnt_table_parse_stream:
* @tb: tab pointer
* @f: file stream
* @filename: filename used for debug and error messages
*
* Returns: 0 on success, negative number in case of error.
*/
int mnt_table_parse_stream(struct libmnt_table *tb, FILE *f, const char *filename)
{
int rc = -1;
int flags = 0;
pid_t tid = -1;
struct libmnt_fs *fs = NULL;
struct libmnt_parser pa = { .line = 0 };
assert(tb);
assert(f);
assert(filename);
DBG(TAB, ul_debugobj(tb, "%s: start parsing [entries=%d, filter=%s]",
filename, mnt_table_get_nents(tb),
tb->fltrcb ? "yes" : "not"));
pa.filename = filename;
pa.f = f;
/* necessary for /proc/mounts only, the /proc/self/mountinfo
* parser sets the flag properly
*/
if (filename && strcmp(filename, _PATH_PROC_MOUNTS) == 0)
flags = MNT_FS_KERNEL;
while (!feof(f)) {
if (!fs) {
fs = mnt_new_fs();
if (!fs)
goto err;
}
rc = mnt_table_parse_next(&pa, tb, fs);
if (!rc && tb->fltrcb && tb->fltrcb(fs, tb->fltrcb_data))
rc = 1; /* filtered out by callback... */
if (!rc) {
rc = mnt_table_add_fs(tb, fs);
fs->flags |= flags;
if (rc == 0 && tb->fmt == MNT_FMT_MOUNTINFO) {
rc = kernel_fs_postparse(tb, fs, &tid, filename);
if (rc)
mnt_table_remove_fs(tb, fs);
}
}
if (rc) {
if (rc > 0) {
mnt_reset_fs(fs);
assert(fs->refcount == 1);
continue; /* recoverable error, reuse fs*/
}
mnt_unref_fs(fs);
if (feof(f))
break;
goto err; /* fatal error */
}
mnt_unref_fs(fs);
fs = NULL;
}
DBG(TAB, ul_debugobj(tb, "%s: stop parsing (%d entries)",
filename, mnt_table_get_nents(tb)));
parser_cleanup(&pa);
return 0;
err:
DBG(TAB, ul_debugobj(tb, "%s: parse error (rc=%d)", filename, rc));
parser_cleanup(&pa);
return rc;
}
/**
* mnt_table_parse_file:
* @tb: tab pointer
* @filename: file
*
* Parses the whole table (e.g. /etc/fstab) and appends new records to the @tab.
*
* The libmount parser ignores broken (syntax error) lines, these lines are
* reported to the caller by the errcb() function (see mnt_table_set_parser_errcb()).
*
* Returns: 0 on success, negative number in case of error.
*/
int mnt_table_parse_file(struct libmnt_table *tb, const char *filename)
{
FILE *f;
int rc;
if (!filename || !tb)
return -EINVAL;
f = fopen(filename, "r" UL_CLOEXECSTR);
if (f) {
rc = mnt_table_parse_stream(tb, f, filename);
fclose(f);
} else
rc = -errno;
DBG(TAB, ul_debugobj(tb, "parsing done [filename=%s, rc=%d]", filename, rc));
return rc;
}
