From: "Darrick J. Wong" djwong@kernel.org
commit 150bb10a28b9c8709ae227fc898d9cf6136faa1e upstream.
generic/388 has an annoying tendency to fail like this during log recovery:
XFS (sda4): Unmounting Filesystem 435fe39b-82b6-46ef-be56-819499585130 XFS (sda4): Mounting V5 Filesystem 435fe39b-82b6-46ef-be56-819499585130 XFS (sda4): Starting recovery (logdev: internal) 00000000: 49 4e 81 b6 03 02 00 00 00 00 00 07 00 00 00 07 IN.............. 00000010: 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 10 ................ 00000020: 35 9a 8b c1 3e 6e 81 00 35 9a 8b c1 3f dc b7 00 5...>n..5...?... 00000030: 35 9a 8b c1 3f dc b7 00 00 00 00 00 00 3c 86 4f 5...?........<.O 00000040: 00 00 00 00 00 00 02 f3 00 00 00 00 00 00 00 00 ................ 00000050: 00 00 1f 01 00 00 00 00 00 00 00 02 b2 74 c9 0b .............t.. 00000060: ff ff ff ff d7 45 73 10 00 00 00 00 00 00 00 2d .....Es........- 00000070: 00 00 07 92 00 01 fe 30 00 00 00 00 00 00 00 1a .......0........ 00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000090: 35 9a 8b c1 3b 55 0c 00 00 00 00 00 04 27 b2 d1 5...;U.......'.. 000000a0: 43 5f e3 9b 82 b6 46 ef be 56 81 94 99 58 51 30 C_....F..V...XQ0 XFS (sda4): Internal error Bad dinode after recovery at line 539 of file fs/xfs/xfs_inode_item_recover.c. Caller xlog_recover_items_pass2+0x4e/0xc0 [xfs] CPU: 0 PID: 2189311 Comm: mount Not tainted 6.9.0-rc4-djwx #rc4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20171121_152543-x86-ol7-builder-01.us.oracle.com-4.el7.1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x4f/0x60 xfs_corruption_error+0x90/0xa0 xlog_recover_inode_commit_pass2+0x5f1/0xb00 xlog_recover_items_pass2+0x4e/0xc0 xlog_recover_commit_trans+0x2db/0x350 xlog_recovery_process_trans+0xab/0xe0 xlog_recover_process_data+0xa7/0x130 xlog_do_recovery_pass+0x398/0x840 xlog_do_log_recovery+0x62/0xc0 xlog_do_recover+0x34/0x1d0 xlog_recover+0xe9/0x1a0 xfs_log_mount+0xff/0x260 xfs_mountfs+0x5d9/0xb60 xfs_fs_fill_super+0x76b/0xa30 get_tree_bdev+0x124/0x1d0 vfs_get_tree+0x17/0xa0 path_mount+0x72b/0xa90 __x64_sys_mount+0x112/0x150 do_syscall_64+0x49/0x100 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK> XFS (sda4): Corruption detected. Unmount and run xfs_repair XFS (sda4): Metadata corruption detected at xfs_dinode_verify.part.0+0x739/0x920 [xfs], inode 0x427b2d1 XFS (sda4): Filesystem has been shut down due to log error (0x2). XFS (sda4): Please unmount the filesystem and rectify the problem(s). XFS (sda4): log mount/recovery failed: error -117 XFS (sda4): log mount failed
This inode log item recovery failing the dinode verifier after replaying the contents of the inode log item into the ondisk inode. Looking back into what the kernel was doing at the time of the fs shutdown, a thread was in the middle of running a series of transactions, each of which committed changes to the inode.
At some point in the middle of that chain, an invalid (at least according to the verifier) change was committed. Had the filesystem not shut down in the middle of the chain, a subsequent transaction would have corrected the invalid state and nobody would have noticed. But that's not what happened here. Instead, the invalid inode state was committed to the ondisk log, so log recovery tripped over it.
The actual defect here was an overzealous inode verifier, which was fixed in a separate patch. This patch adds some transaction precommit functions for CONFIG_XFS_DEBUG=y mode so that we can detect these kinds of transient errors at transaction commit time, where it's much easier to find the root cause.
Signed-off-by: Darrick J. Wong djwong@kernel.org Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Catherine Hoang catherine.hoang@oracle.com Acked-by: Darrick J. Wong djwong@kernel.org --- fs/xfs/Kconfig | 12 ++++++++++++ fs/xfs/xfs.h | 4 ++++ fs/xfs/xfs_buf_item.c | 32 ++++++++++++++++++++++++++++++++ fs/xfs/xfs_dquot_item.c | 31 +++++++++++++++++++++++++++++++ fs/xfs/xfs_inode_item.c | 32 ++++++++++++++++++++++++++++++++ 5 files changed, 111 insertions(+)
diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig index 567fb37274d3..ced0e6272aef 100644 --- a/fs/xfs/Kconfig +++ b/fs/xfs/Kconfig @@ -204,6 +204,18 @@ config XFS_DEBUG
Say N unless you are an XFS developer, or you play one on TV.
+config XFS_DEBUG_EXPENSIVE + bool "XFS expensive debugging checks" + depends on XFS_FS && XFS_DEBUG + help + Say Y here to get an XFS build with expensive debugging checks + enabled. These checks may affect performance significantly. + + Note that the resulting code will be HUGER and SLOWER, and probably + not useful unless you are debugging a particular problem. + + Say N unless you are an XFS developer, or you play one on TV. + config XFS_ASSERT_FATAL bool "XFS fatal asserts" default y diff --git a/fs/xfs/xfs.h b/fs/xfs/xfs.h index f6ffb4f248f7..9355ccad9503 100644 --- a/fs/xfs/xfs.h +++ b/fs/xfs/xfs.h @@ -10,6 +10,10 @@ #define DEBUG 1 #endif
+#ifdef CONFIG_XFS_DEBUG_EXPENSIVE +#define DEBUG_EXPENSIVE 1 +#endif + #ifdef CONFIG_XFS_ASSERT_FATAL #define XFS_ASSERT_FATAL 1 #endif diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c index 023d4e0385dd..b02ce568de0c 100644 --- a/fs/xfs/xfs_buf_item.c +++ b/fs/xfs/xfs_buf_item.c @@ -22,6 +22,7 @@ #include "xfs_trace.h" #include "xfs_log.h" #include "xfs_log_priv.h" +#include "xfs_error.h"
struct kmem_cache *xfs_buf_item_cache; @@ -781,8 +782,39 @@ xfs_buf_item_committed( return lsn; }
+#ifdef DEBUG_EXPENSIVE +static int +xfs_buf_item_precommit( + struct xfs_trans *tp, + struct xfs_log_item *lip) +{ + struct xfs_buf_log_item *bip = BUF_ITEM(lip); + struct xfs_buf *bp = bip->bli_buf; + struct xfs_mount *mp = bp->b_mount; + xfs_failaddr_t fa; + + if (!bp->b_ops || !bp->b_ops->verify_struct) + return 0; + if (bip->bli_flags & XFS_BLI_STALE) + return 0; + + fa = bp->b_ops->verify_struct(bp); + if (fa) { + xfs_buf_verifier_error(bp, -EFSCORRUPTED, bp->b_ops->name, + bp->b_addr, BBTOB(bp->b_length), fa); + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); + ASSERT(fa == NULL); + } + + return 0; +} +#else +# define xfs_buf_item_precommit NULL +#endif + static const struct xfs_item_ops xfs_buf_item_ops = { .iop_size = xfs_buf_item_size, + .iop_precommit = xfs_buf_item_precommit, .iop_format = xfs_buf_item_format, .iop_pin = xfs_buf_item_pin, .iop_unpin = xfs_buf_item_unpin, diff --git a/fs/xfs/xfs_dquot_item.c b/fs/xfs/xfs_dquot_item.c index 6a1aae799cf1..7d19091215b0 100644 --- a/fs/xfs/xfs_dquot_item.c +++ b/fs/xfs/xfs_dquot_item.c @@ -17,6 +17,7 @@ #include "xfs_trans_priv.h" #include "xfs_qm.h" #include "xfs_log.h" +#include "xfs_error.h"
static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip) { @@ -193,8 +194,38 @@ xfs_qm_dquot_logitem_committing( return xfs_qm_dquot_logitem_release(lip); }
+#ifdef DEBUG_EXPENSIVE +static int +xfs_qm_dquot_logitem_precommit( + struct xfs_trans *tp, + struct xfs_log_item *lip) +{ + struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; + struct xfs_mount *mp = dqp->q_mount; + struct xfs_disk_dquot ddq = { }; + xfs_failaddr_t fa; + + xfs_dquot_to_disk(&ddq, dqp); + fa = xfs_dquot_verify(mp, &ddq, dqp->q_id); + if (fa) { + XFS_CORRUPTION_ERROR("Bad dquot during logging", + XFS_ERRLEVEL_LOW, mp, &ddq, sizeof(ddq)); + xfs_alert(mp, + "Metadata corruption detected at %pS, dquot 0x%x", + fa, dqp->q_id); + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); + ASSERT(fa == NULL); + } + + return 0; +} +#else +# define xfs_qm_dquot_logitem_precommit NULL +#endif + static const struct xfs_item_ops xfs_dquot_item_ops = { .iop_size = xfs_qm_dquot_logitem_size, + .iop_precommit = xfs_qm_dquot_logitem_precommit, .iop_format = xfs_qm_dquot_logitem_format, .iop_pin = xfs_qm_dquot_logitem_pin, .iop_unpin = xfs_qm_dquot_logitem_unpin, diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c index 155a8b312875..b55ad3b7b113 100644 --- a/fs/xfs/xfs_inode_item.c +++ b/fs/xfs/xfs_inode_item.c @@ -36,6 +36,36 @@ xfs_inode_item_sort( return INODE_ITEM(lip)->ili_inode->i_ino; }
+#ifdef DEBUG_EXPENSIVE +static void +xfs_inode_item_precommit_check( + struct xfs_inode *ip) +{ + struct xfs_mount *mp = ip->i_mount; + struct xfs_dinode *dip; + xfs_failaddr_t fa; + + dip = kzalloc(mp->m_sb.sb_inodesize, GFP_KERNEL | GFP_NOFS); + if (!dip) { + ASSERT(dip != NULL); + return; + } + + xfs_inode_to_disk(ip, dip, 0); + xfs_dinode_calc_crc(mp, dip); + fa = xfs_dinode_verify(mp, ip->i_ino, dip); + if (fa) { + xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip, + sizeof(*dip), fa); + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); + ASSERT(fa == NULL); + } + kfree(dip); +} +#else +# define xfs_inode_item_precommit_check(ip) ((void)0) +#endif + /* * Prior to finally logging the inode, we have to ensure that all the * per-modification inode state changes are applied. This includes VFS inode @@ -168,6 +198,8 @@ xfs_inode_item_precommit( iip->ili_fields |= (flags | iip->ili_last_fields); spin_unlock(&iip->ili_lock);
+ xfs_inode_item_precommit_check(ip); + /* * We are done with the log item transaction dirty state, so clear it so * that it doesn't pollute future transactions.