static int update_remove_entry(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_table *tb;
int rc = 0;
assert(upd);
assert(upd->target);
DBG(UPDATE, mnt_debug_h(upd, "%s: remove entry", upd->filename));
if (lc)
rc = mnt_lock_file(lc);
if (rc)
return rc;
tb = __mnt_new_table_from_file(upd->filename,
upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB);
if (tb) {
struct libmnt_fs *rem = mnt_table_find_target(tb, upd->target, MNT_ITER_BACKWARD);
if (rem) {
mnt_table_remove_fs(tb, rem);
rc = update_table(upd, tb);
mnt_free_fs(rem);
}
}
if (lc)
mnt_unlock_file(lc);
mnt_free_table(tb);
return rc;
}
/**
* mnt_reset_table:
* @tb: tab pointer
*
* Removes all entries (filesystems) from the table. The filesystems with zero
* reference count will be deallocated.
*
* Returns: 0 on success or negative number in case of error.
*/
int mnt_reset_table(struct libmnt_table *tb)
{
if (!tb)
return -EINVAL;
DBG(TAB, ul_debugobj(tb, "reset"));
while (!list_empty(&tb->ents)) {
struct libmnt_fs *fs = list_entry(tb->ents.next,
struct libmnt_fs, ents);
mnt_table_remove_fs(tb, fs);
}
tb->nents = 0;
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;
}