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![Josh Poimboeuf](/assets/img/avatar_default.png)
Fixes a bunch of warnings including: vmlinux.o: warning: objtool: select_reloc_root+0x314: unreachable instruction vmlinux.o: warning: objtool: finish_inode_if_needed+0x15b1: unreachable instruction vmlinux.o: warning: objtool: get_bio_sector_nr+0x259: unreachable instruction vmlinux.o: warning: objtool: raid_wait_read_end_io+0xc26: unreachable instruction vmlinux.o: warning: objtool: raid56_parity_alloc_scrub_rbio+0x37b: unreachable instruction ... Reported-by: kernel test robot <lkp@intel.com> Link: https://lore.kernel.org/oe-kbuild-all/202302210709.IlXfgMpX-lkp@intel.com/ Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
323 lines
8.9 KiB
C
323 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "fs.h"
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#include "messages.h"
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#include "discard.h"
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#include "transaction.h"
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#include "space-info.h"
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#include "super.h"
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#ifdef CONFIG_PRINTK
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#define STATE_STRING_PREFACE ": state "
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#define STATE_STRING_BUF_LEN (sizeof(STATE_STRING_PREFACE) + BTRFS_FS_STATE_COUNT)
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/*
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* Characters to print to indicate error conditions or uncommon filesystem state.
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* RO is not an error.
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*/
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static const char fs_state_chars[] = {
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[BTRFS_FS_STATE_ERROR] = 'E',
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[BTRFS_FS_STATE_REMOUNTING] = 'M',
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[BTRFS_FS_STATE_RO] = 0,
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[BTRFS_FS_STATE_TRANS_ABORTED] = 'A',
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[BTRFS_FS_STATE_DEV_REPLACING] = 'R',
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[BTRFS_FS_STATE_DUMMY_FS_INFO] = 0,
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[BTRFS_FS_STATE_NO_CSUMS] = 'C',
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[BTRFS_FS_STATE_LOG_CLEANUP_ERROR] = 'L',
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};
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static void btrfs_state_to_string(const struct btrfs_fs_info *info, char *buf)
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{
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unsigned int bit;
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bool states_printed = false;
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unsigned long fs_state = READ_ONCE(info->fs_state);
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char *curr = buf;
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memcpy(curr, STATE_STRING_PREFACE, sizeof(STATE_STRING_PREFACE));
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curr += sizeof(STATE_STRING_PREFACE) - 1;
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for_each_set_bit(bit, &fs_state, sizeof(fs_state)) {
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WARN_ON_ONCE(bit >= BTRFS_FS_STATE_COUNT);
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if ((bit < BTRFS_FS_STATE_COUNT) && fs_state_chars[bit]) {
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*curr++ = fs_state_chars[bit];
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states_printed = true;
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}
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}
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/* If no states were printed, reset the buffer */
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if (!states_printed)
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curr = buf;
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*curr++ = 0;
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}
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#endif
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/*
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* Generally the error codes correspond to their respective errors, but there
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* are a few special cases.
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*
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* EUCLEAN: Any sort of corruption that we encounter. The tree-checker for
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* instance will return EUCLEAN if any of the blocks are corrupted in
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* a way that is problematic. We want to reserve EUCLEAN for these
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* sort of corruptions.
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*
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* EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we
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* need to use EROFS for this case. We will have no idea of the
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* original failure, that will have been reported at the time we tripped
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* over the error. Each subsequent error that doesn't have any context
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* of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR.
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*/
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const char * __attribute_const__ btrfs_decode_error(int errno)
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{
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char *errstr = "unknown";
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switch (errno) {
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case -ENOENT: /* -2 */
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errstr = "No such entry";
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break;
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case -EIO: /* -5 */
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errstr = "IO failure";
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break;
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case -ENOMEM: /* -12*/
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errstr = "Out of memory";
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break;
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case -EEXIST: /* -17 */
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errstr = "Object already exists";
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break;
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case -ENOSPC: /* -28 */
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errstr = "No space left";
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break;
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case -EROFS: /* -30 */
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errstr = "Readonly filesystem";
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break;
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case -EOPNOTSUPP: /* -95 */
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errstr = "Operation not supported";
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break;
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case -EUCLEAN: /* -117 */
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errstr = "Filesystem corrupted";
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break;
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case -EDQUOT: /* -122 */
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errstr = "Quota exceeded";
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break;
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}
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return errstr;
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}
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/*
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* __btrfs_handle_fs_error decodes expected errors from the caller and
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* invokes the appropriate error response.
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*/
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__cold
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void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
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unsigned int line, int errno, const char *fmt, ...)
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{
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struct super_block *sb = fs_info->sb;
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#ifdef CONFIG_PRINTK
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char statestr[STATE_STRING_BUF_LEN];
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const char *errstr;
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#endif
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#ifdef CONFIG_PRINTK_INDEX
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printk_index_subsys_emit(
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"BTRFS: error (device %s%s) in %s:%d: errno=%d %s", KERN_CRIT, fmt);
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#endif
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/*
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* Special case: if the error is EROFS, and we're already under
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* SB_RDONLY, then it is safe here.
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*/
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if (errno == -EROFS && sb_rdonly(sb))
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return;
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#ifdef CONFIG_PRINTK
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errstr = btrfs_decode_error(errno);
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btrfs_state_to_string(fs_info, statestr);
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if (fmt) {
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s (%pV)\n",
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sb->s_id, statestr, function, line, errno, errstr, &vaf);
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va_end(args);
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} else {
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pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s\n",
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sb->s_id, statestr, function, line, errno, errstr);
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}
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#endif
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/*
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* Today we only save the error info to memory. Long term we'll also
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* send it down to the disk.
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*/
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set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
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/* Don't go through full error handling during mount. */
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if (!(sb->s_flags & SB_BORN))
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return;
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if (sb_rdonly(sb))
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return;
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btrfs_discard_stop(fs_info);
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/* Handle error by forcing the filesystem readonly. */
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btrfs_set_sb_rdonly(sb);
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btrfs_info(fs_info, "forced readonly");
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/*
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* Note that a running device replace operation is not canceled here
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* although there is no way to update the progress. It would add the
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* risk of a deadlock, therefore the canceling is omitted. The only
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* penalty is that some I/O remains active until the procedure
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* completes. The next time when the filesystem is mounted writable
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* again, the device replace operation continues.
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*/
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}
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#ifdef CONFIG_PRINTK
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static const char * const logtypes[] = {
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"emergency",
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"alert",
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"critical",
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"error",
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"warning",
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"notice",
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"info",
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"debug",
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};
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/*
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* Use one ratelimit state per log level so that a flood of less important
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* messages doesn't cause more important ones to be dropped.
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*/
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static struct ratelimit_state printk_limits[] = {
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RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100),
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RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100),
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RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100),
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RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100),
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RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100),
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RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100),
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RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100),
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RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100),
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};
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void __cold _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
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{
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char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0";
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struct va_format vaf;
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va_list args;
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int kern_level;
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const char *type = logtypes[4];
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struct ratelimit_state *ratelimit = &printk_limits[4];
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#ifdef CONFIG_PRINTK_INDEX
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printk_index_subsys_emit("%sBTRFS %s (device %s): ", NULL, fmt);
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#endif
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va_start(args, fmt);
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while ((kern_level = printk_get_level(fmt)) != 0) {
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size_t size = printk_skip_level(fmt) - fmt;
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if (kern_level >= '0' && kern_level <= '7') {
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memcpy(lvl, fmt, size);
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lvl[size] = '\0';
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type = logtypes[kern_level - '0'];
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ratelimit = &printk_limits[kern_level - '0'];
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}
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fmt += size;
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}
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vaf.fmt = fmt;
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vaf.va = &args;
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if (__ratelimit(ratelimit)) {
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if (fs_info) {
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char statestr[STATE_STRING_BUF_LEN];
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btrfs_state_to_string(fs_info, statestr);
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_printk("%sBTRFS %s (device %s%s): %pV\n", lvl, type,
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fs_info->sb->s_id, statestr, &vaf);
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} else {
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_printk("%sBTRFS %s: %pV\n", lvl, type, &vaf);
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}
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}
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va_end(args);
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}
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#endif
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#ifdef CONFIG_BTRFS_ASSERT
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void __cold __noreturn btrfs_assertfail(const char *expr, const char *file, int line)
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{
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pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
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BUG();
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}
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#endif
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void __cold btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
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{
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btrfs_err(fs_info,
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"Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
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}
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#if BITS_PER_LONG == 32
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void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info)
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{
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if (!test_and_set_bit(BTRFS_FS_32BIT_WARN, &fs_info->flags)) {
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btrfs_warn(fs_info, "reaching 32bit limit for logical addresses");
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btrfs_warn(fs_info,
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"due to page cache limit on 32bit systems, btrfs can't access metadata at or beyond %lluT",
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BTRFS_32BIT_MAX_FILE_SIZE >> 40);
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btrfs_warn(fs_info,
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"please consider upgrading to 64bit kernel/hardware");
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}
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}
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void __cold btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info)
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{
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if (!test_and_set_bit(BTRFS_FS_32BIT_ERROR, &fs_info->flags)) {
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btrfs_err(fs_info, "reached 32bit limit for logical addresses");
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btrfs_err(fs_info,
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"due to page cache limit on 32bit systems, metadata beyond %lluT can't be accessed",
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BTRFS_32BIT_MAX_FILE_SIZE >> 40);
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btrfs_err(fs_info,
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"please consider upgrading to 64bit kernel/hardware");
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}
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}
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#endif
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/*
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* __btrfs_panic decodes unexpected, fatal errors from the caller, issues an
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* alert, and either panics or BUGs, depending on mount options.
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*/
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__cold
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void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
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unsigned int line, int errno, const char *fmt, ...)
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{
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char *s_id = "<unknown>";
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const char *errstr;
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struct va_format vaf = { .fmt = fmt };
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va_list args;
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if (fs_info)
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s_id = fs_info->sb->s_id;
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va_start(args, fmt);
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vaf.va = &args;
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errstr = btrfs_decode_error(errno);
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if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR)))
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panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n",
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s_id, function, line, &vaf, errno, errstr);
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btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
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function, line, &vaf, errno, errstr);
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va_end(args);
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/* Caller calls BUG() */
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}
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