Contributors: 17
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Josef Whiter |
556 |
46.06% |
6 |
15.38% |
| Sweet Tea Dorminy |
197 |
16.32% |
1 |
2.56% |
| Liu Bo |
142 |
11.76% |
1 |
2.56% |
| Jeff Mahoney |
94 |
7.79% |
3 |
7.69% |
| David Sterba |
88 |
7.29% |
12 |
30.77% |
| Qu Wenruo |
27 |
2.24% |
2 |
5.13% |
| Anand Jain |
27 |
2.24% |
2 |
5.13% |
| Filipe David Borba Manana |
20 |
1.66% |
2 |
5.13% |
| Eric Sandeen |
17 |
1.41% |
1 |
2.56% |
| Chris Mason |
16 |
1.33% |
2 |
5.13% |
| Dennis Zhou |
8 |
0.66% |
1 |
2.56% |
| Joe Perches |
6 |
0.50% |
1 |
2.56% |
| David Howells |
3 |
0.25% |
1 |
2.56% |
| Frank Holton |
3 |
0.25% |
1 |
2.56% |
| Linus Torvalds |
1 |
0.08% |
1 |
2.56% |
| Andrea Gelmini |
1 |
0.08% |
1 |
2.56% |
| Xiaoguang Wang |
1 |
0.08% |
1 |
2.56% |
| Total |
1207 |
|
39 |
|
// SPDX-License-Identifier: GPL-2.0
#include "fs.h"
#include "messages.h"
#include "discard.h"
#include "super.h"
#ifdef CONFIG_PRINTK
#define STATE_STRING_PREFACE " state "
#define STATE_STRING_BUF_LEN (sizeof(STATE_STRING_PREFACE) + BTRFS_FS_STATE_COUNT + 1)
/*
* Characters to print to indicate error conditions or uncommon filesystem state.
* RO is not an error.
*/
static const char fs_state_chars[] = {
[BTRFS_FS_STATE_REMOUNTING] = 'M',
[BTRFS_FS_STATE_RO] = 0,
[BTRFS_FS_STATE_TRANS_ABORTED] = 'A',
[BTRFS_FS_STATE_DEV_REPLACING] = 'R',
[BTRFS_FS_STATE_DUMMY_FS_INFO] = 0,
[BTRFS_FS_STATE_NO_DATA_CSUMS] = 'C',
[BTRFS_FS_STATE_SKIP_META_CSUMS] = 'S',
[BTRFS_FS_STATE_LOG_CLEANUP_ERROR] = 'L',
};
static void btrfs_state_to_string(const struct btrfs_fs_info *info, char *buf)
{
unsigned int bit;
bool states_printed = false;
unsigned long fs_state = READ_ONCE(info->fs_state);
char *curr = buf;
memcpy(curr, STATE_STRING_PREFACE, sizeof(STATE_STRING_PREFACE));
curr += sizeof(STATE_STRING_PREFACE) - 1;
if (BTRFS_FS_ERROR(info)) {
*curr++ = 'E';
states_printed = true;
}
for_each_set_bit(bit, &fs_state, sizeof(fs_state)) {
WARN_ON_ONCE(bit >= BTRFS_FS_STATE_COUNT);
if ((bit < BTRFS_FS_STATE_COUNT) && fs_state_chars[bit]) {
*curr++ = fs_state_chars[bit];
states_printed = true;
}
}
/* If no states were printed, reset the buffer */
if (!states_printed)
curr = buf;
*curr++ = 0;
}
#endif
/*
* Generally the error codes correspond to their respective errors, but there
* are a few special cases.
*
* EUCLEAN: Any sort of corruption that we encounter. The tree-checker for
* instance will return EUCLEAN if any of the blocks are corrupted in
* a way that is problematic. We want to reserve EUCLEAN for these
* sort of corruptions.
*
* EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we
* need to use EROFS for this case. We will have no idea of the
* original failure, that will have been reported at the time we tripped
* over the error. Each subsequent error that doesn't have any context
* of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR.
*/
const char * __attribute_const__ btrfs_decode_error(int error)
{
char *errstr = "unknown";
switch (error) {
case -ENOENT: /* -2 */
errstr = "No such entry";
break;
case -EIO: /* -5 */
errstr = "IO failure";
break;
case -ENOMEM: /* -12*/
errstr = "Out of memory";
break;
case -EEXIST: /* -17 */
errstr = "Object already exists";
break;
case -ENOSPC: /* -28 */
errstr = "No space left";
break;
case -EROFS: /* -30 */
errstr = "Readonly filesystem";
break;
case -EOPNOTSUPP: /* -95 */
errstr = "Operation not supported";
break;
case -EUCLEAN: /* -117 */
errstr = "Filesystem corrupted";
break;
case -EDQUOT: /* -122 */
errstr = "Quota exceeded";
break;
}
return errstr;
}
/*
* Decodes expected errors from the caller and invokes the appropriate error
* response.
*/
__cold
void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
unsigned int line, int error, const char *fmt, ...)
{
struct super_block *sb = fs_info->sb;
#ifdef CONFIG_PRINTK
char statestr[STATE_STRING_BUF_LEN];
const char *errstr;
#endif
#ifdef CONFIG_PRINTK_INDEX
printk_index_subsys_emit(
"BTRFS: error (device %s%s) in %s:%d: errno=%d %s", KERN_CRIT, fmt);
#endif
/*
* Special case: if the error is EROFS, and we're already under
* SB_RDONLY, then it is safe here.
*/
if (error == -EROFS && sb_rdonly(sb))
return;
#ifdef CONFIG_PRINTK
errstr = btrfs_decode_error(error);
btrfs_state_to_string(fs_info, statestr);
if (fmt) {
struct va_format vaf;
va_list args;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s (%pV)\n",
sb->s_id, statestr, function, line, error, errstr, &vaf);
va_end(args);
} else {
pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s\n",
sb->s_id, statestr, function, line, error, errstr);
}
#endif
/*
* Today we only save the error info to memory. Long term we'll also
* send it down to the disk.
*/
WRITE_ONCE(fs_info->fs_error, error);
/* Don't go through full error handling during mount. */
if (!(sb->s_flags & SB_BORN))
return;
if (sb_rdonly(sb))
return;
btrfs_discard_stop(fs_info);
/* Handle error by forcing the filesystem readonly. */
btrfs_set_sb_rdonly(sb);
btrfs_info(fs_info, "forced readonly");
/*
* Note that a running device replace operation is not canceled here
* although there is no way to update the progress. It would add the
* risk of a deadlock, therefore the canceling is omitted. The only
* penalty is that some I/O remains active until the procedure
* completes. The next time when the filesystem is mounted writable
* again, the device replace operation continues.
*/
}
#ifdef CONFIG_PRINTK
static const char * const logtypes[] = {
"emergency",
"alert",
"critical",
"error",
"warning",
"notice",
"info",
"debug",
};
/*
* Use one ratelimit state per log level so that a flood of less important
* messages doesn't cause more important ones to be dropped.
*/
static struct ratelimit_state printk_limits[] = {
RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100),
RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100),
RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100),
RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100),
RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100),
RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100),
RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100),
RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100),
};
void __cold _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
{
char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0";
struct va_format vaf;
va_list args;
int kern_level;
const char *type = logtypes[4];
struct ratelimit_state *ratelimit = &printk_limits[4];
#ifdef CONFIG_PRINTK_INDEX
printk_index_subsys_emit("%sBTRFS %s (device %s): ", NULL, fmt);
#endif
va_start(args, fmt);
while ((kern_level = printk_get_level(fmt)) != 0) {
size_t size = printk_skip_level(fmt) - fmt;
if (kern_level >= '0' && kern_level <= '7') {
memcpy(lvl, fmt, size);
lvl[size] = '\0';
type = logtypes[kern_level - '0'];
ratelimit = &printk_limits[kern_level - '0'];
}
fmt += size;
}
vaf.fmt = fmt;
vaf.va = &args;
if (__ratelimit(ratelimit)) {
if (fs_info) {
char statestr[STATE_STRING_BUF_LEN];
btrfs_state_to_string(fs_info, statestr);
_printk("%sBTRFS %s (device %s%s): %pV\n", lvl, type,
fs_info->sb->s_id, statestr, &vaf);
} else {
_printk("%sBTRFS %s: %pV\n", lvl, type, &vaf);
}
}
va_end(args);
}
#endif
#if BITS_PER_LONG == 32
void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info)
{
if (!test_and_set_bit(BTRFS_FS_32BIT_WARN, &fs_info->flags)) {
btrfs_warn(fs_info, "reaching 32bit limit for logical addresses");
btrfs_warn(fs_info,
"due to page cache limit on 32bit systems, btrfs can't access metadata at or beyond %lluT",
BTRFS_32BIT_MAX_FILE_SIZE >> 40);
btrfs_warn(fs_info,
"please consider upgrading to 64bit kernel/hardware");
}
}
void __cold btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info)
{
if (!test_and_set_bit(BTRFS_FS_32BIT_ERROR, &fs_info->flags)) {
btrfs_err(fs_info, "reached 32bit limit for logical addresses");
btrfs_err(fs_info,
"due to page cache limit on 32bit systems, metadata beyond %lluT can't be accessed",
BTRFS_32BIT_MAX_FILE_SIZE >> 40);
btrfs_err(fs_info,
"please consider upgrading to 64bit kernel/hardware");
}
}
#endif
/*
* Decode unexpected, fatal errors from the caller, issue an alert, and either
* panic or BUGs, depending on mount options.
*/
__cold
void __btrfs_panic(const struct btrfs_fs_info *fs_info, const char *function,
unsigned int line, int error, const char *fmt, ...)
{
char *s_id = "<unknown>";
const char *errstr;
struct va_format vaf = { .fmt = fmt };
va_list args;
if (fs_info)
s_id = fs_info->sb->s_id;
va_start(args, fmt);
vaf.va = &args;
errstr = btrfs_decode_error(error);
if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR)))
panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n",
s_id, function, line, &vaf, error, errstr);
btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
function, line, &vaf, error, errstr);
va_end(args);
/* Caller calls BUG() */
}