From: Theodore Ts'o tytso@mit.edu
mainline inclusion from mainline-v5.6-rc1 commit 878520ac45f9f698432d4276db3d9144b83931b6 category: bugfix bugzilla: 46758 CVE: NA
-----------------------------------------------
This allows the cause of an ext4_error() report to be categorized based on whether it was triggered due to an I/O error, or an memory allocation error, or other possible causes. Most errors are caused by a detected file system inconsistency, so the default code stored in the superblock will be EXT4_ERR_EFSCORRUPTED.
Link: https://lore.kernel.org/r/20191204032335.7683-1-tytso@mit.edu Signed-off-by: Theodore Ts'o tytso@mit.edu
conflicts: fs/ext4/ext4.h fs/ext4/inode.c fs/ext4/namei.c
Signed-off-by: Ye Bin yebin10@huawei.com Reviewed-by: zhangyi (F) yi.zhang@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com Signed-off-by: Cheng Jian cj.chengjian@huawei.com --- fs/ext4/balloc.c | 1 + fs/ext4/ext4.h | 30 +++++++++++++++++++- fs/ext4/ext4_jbd2.c | 3 ++ fs/ext4/extents.c | 1 + fs/ext4/ialloc.c | 2 ++ fs/ext4/inline.c | 2 ++ fs/ext4/inode.c | 8 +++++- fs/ext4/mballoc.c | 4 +++ fs/ext4/mmp.c | 6 +++- fs/ext4/namei.c | 4 +++ fs/ext4/super.c | 68 ++++++++++++++++++++++++++++++++++++++++++++- fs/ext4/xattr.c | 4 ++- 12 files changed, 128 insertions(+), 5 deletions(-)
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index 904fe348084f..9fb2e0507a08 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -515,6 +515,7 @@ int ext4_wait_block_bitmap(struct super_block *sb, ext4_group_t block_group, return -EFSCORRUPTED; wait_on_buffer(bh); if (!buffer_uptodate(bh)) { + ext4_set_errno(sb, EIO); ext4_error(sb, "Cannot read block bitmap - " "block_group = %u, block_bitmap = %llu", block_group, (unsigned long long) bh->b_blocknr); diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 4587fba7de7b..53993ca80726 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1338,7 +1338,8 @@ struct ext4_super_block { __u8 s_lastcheck_hi; __u8 s_first_error_time_hi; __u8 s_last_error_time_hi; - __u8 s_pad[2]; + __u8 s_first_error_errcode; + __u8 s_last_error_errcode; __le32 s_reserved[96]; /* Padding to the end of the block */ __le32 s_checksum; /* crc32c(superblock) */ }; @@ -1560,6 +1561,32 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); }
+/* + * Error number codes for s_{first,last}_error_errno + * + * Linux errno numbers are architecture specific, so we need to translate + * them into something which is architecture independent. We don't define + * codes for all errno's; just the ones which are most likely to be the cause + * of an ext4_error() call. + */ +#define EXT4_ERR_UNKNOWN 1 +#define EXT4_ERR_EIO 2 +#define EXT4_ERR_ENOMEM 3 +#define EXT4_ERR_EFSBADCRC 4 +#define EXT4_ERR_EFSCORRUPTED 5 +#define EXT4_ERR_ENOSPC 6 +#define EXT4_ERR_ENOKEY 7 +#define EXT4_ERR_EROFS 8 +#define EXT4_ERR_EFBIG 9 +#define EXT4_ERR_EEXIST 10 +#define EXT4_ERR_ERANGE 11 +#define EXT4_ERR_EOVERFLOW 12 +#define EXT4_ERR_EBUSY 13 +#define EXT4_ERR_ENOTDIR 14 +#define EXT4_ERR_ENOTEMPTY 15 +#define EXT4_ERR_ESHUTDOWN 16 +#define EXT4_ERR_EFAULT 17 + /* * Returns: sbi->field[index] * Used to access an array element from the following sbi fields which require @@ -2625,6 +2652,7 @@ extern const char *ext4_decode_error(struct super_block *sb, int errno, extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb, ext4_group_t block_group, unsigned int flags); +extern void ext4_set_errno(struct super_block *sb, int err);
extern __printf(4, 5) void __ext4_error(struct super_block *, const char *, unsigned int, diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c index a589b7f79558..c43632cf9886 100644 --- a/fs/ext4/ext4_jbd2.c +++ b/fs/ext4/ext4_jbd2.c @@ -58,6 +58,7 @@ static int ext4_journal_check_start(struct super_block *sb) * take the FS itself readonly cleanly. */ if (journal && is_journal_aborted(journal)) { + ext4_set_errno(sb, -journal->j_errno); ext4_abort(sb, "Detected aborted journal"); return -EROFS; } @@ -273,6 +274,7 @@ int __ext4_forget(const char *where, unsigned int line, handle_t *handle, if (err) { ext4_journal_abort_handle(where, line, __func__, bh, handle, err); + ext4_set_errno(inode->i_sb, -err); __ext4_abort(inode->i_sb, where, line, "error %d when attempting revoke", err); } @@ -345,6 +347,7 @@ int __ext4_handle_dirty_metadata(const char *where, unsigned int line, es = EXT4_SB(inode->i_sb)->s_es; es->s_last_error_block = cpu_to_le64(bh->b_blocknr); + ext4_set_errno(inode->i_sb, EIO); ext4_error_inode(inode, where, line, bh->b_blocknr, "IO error syncing itable block"); diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 46af383809c5..0b8dbb6fb5a3 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -492,6 +492,7 @@ static int __ext4_ext_check(const char *function, unsigned int line, return 0;
corrupted: + ext4_set_errno(inode->i_sb, -err); ext4_error_inode(inode, function, line, 0, "pblk %llu bad header/extent: %s - magic %x, " "entries %u, max %u(%u), depth %u(%u)", diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 9b04dac91248..76bc2327837f 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -195,6 +195,7 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) wait_on_buffer(bh); if (!buffer_uptodate(bh)) { put_bh(bh); + ext4_set_errno(sb, EIO); ext4_error(sb, "Cannot read inode bitmap - " "block_group = %u, inode_bitmap = %llu", block_group, bitmap_blk); @@ -1234,6 +1235,7 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) inode = ext4_iget(sb, ino, EXT4_IGET_NORMAL); if (IS_ERR(inode)) { err = PTR_ERR(inode); + ext4_set_errno(sb, -err); ext4_error(sb, "couldn't read orphan inode %lu (err %d)", ino, err); return inode; diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index 32b266c478f9..7184f61e6ddf 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -98,6 +98,7 @@ int ext4_get_max_inline_size(struct inode *inode)
error = ext4_get_inode_loc(inode, &iloc); if (error) { + ext4_set_errno(inode->i_sb, -error); ext4_error_inode(inode, __func__, __LINE__, 0, "can't get inode location %lu", inode->i_ino); @@ -1764,6 +1765,7 @@ bool empty_inline_dir(struct inode *dir, int *has_inline_data)
err = ext4_get_inode_loc(dir, &iloc); if (err) { + ext4_set_errno(dir->i_sb, -err); EXT4_ERROR_INODE(dir, "error %d getting inode %lu block", err, dir->i_ino); return true; diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 34c302f11aa6..c84c0b9a3193 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -288,6 +288,7 @@ void ext4_evict_inode(struct inode *inode) if (inode->i_blocks) { err = ext4_truncate(inode); if (err) { + ext4_set_errno(inode->i_sb, -err); ext4_error(inode->i_sb, "couldn't truncate inode %lu (err %d)", inode->i_ino, err); @@ -2596,10 +2597,12 @@ static int mpage_map_and_submit_extent(handle_t *handle, EXT4_I(inode)->i_disksize = disksize; up_write(&EXT4_I(inode)->i_data_sem); err2 = ext4_mark_inode_dirty(handle, inode); - if (err2) + if (err2) { + ext4_set_errno(inode->i_sb, -err2); ext4_error(inode->i_sb, "Failed to mark inode %lu dirty", inode->i_ino); + } if (!err) err = err2; } @@ -4732,6 +4735,7 @@ static int __ext4_get_inode_loc(struct inode *inode, submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, bh); wait_on_buffer(bh); if (!buffer_uptodate(bh)) { + ext4_set_errno(inode->i_sb, EIO); EXT4_ERROR_INODE_BLOCK(inode, block, "unable to read itable block"); brelse(bh); @@ -4940,6 +4944,7 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, }
if (!ext4_inode_csum_verify(inode, raw_inode, ei)) { + ext4_set_errno(inode->i_sb, EFSBADCRC); ext4_error_inode(inode, function, line, 0, "iget: checksum invalid"); ret = -EFSBADCRC; @@ -5488,6 +5493,7 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc) if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync) sync_dirty_buffer(iloc.bh); if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) { + ext4_set_errno(inode->i_sb, EIO); EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr, "IO error syncing inode"); err = -EIO; diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 23e94193c8b4..69de2abbdff5 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -3923,6 +3923,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb, bitmap_bh = ext4_read_block_bitmap(sb, group); if (IS_ERR(bitmap_bh)) { err = PTR_ERR(bitmap_bh); + ext4_set_errno(sb, -err); ext4_error(sb, "Error %d reading block bitmap for %u", err, group); return 0; @@ -4091,6 +4092,7 @@ void ext4_discard_preallocations(struct inode *inode) err = ext4_mb_load_buddy_gfp(sb, group, &e4b, GFP_NOFS|__GFP_NOFAIL); if (err) { + ext4_set_errno(sb, -err); ext4_error(sb, "Error %d loading buddy information for %u", err, group); continue; @@ -4099,6 +4101,7 @@ void ext4_discard_preallocations(struct inode *inode) bitmap_bh = ext4_read_block_bitmap(sb, group); if (IS_ERR(bitmap_bh)) { err = PTR_ERR(bitmap_bh); + ext4_set_errno(sb, -err); ext4_error(sb, "Error %d reading block bitmap for %u", err, group); ext4_mb_unload_buddy(&e4b); @@ -4353,6 +4356,7 @@ ext4_mb_discard_lg_preallocations(struct super_block *sb, err = ext4_mb_load_buddy_gfp(sb, group, &e4b, GFP_NOFS|__GFP_NOFAIL); if (err) { + ext4_set_errno(sb, -err); ext4_error(sb, "Error %d loading buddy information for %u", err, group); continue; diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c index 9d00e0dd2ba9..87f7551c5132 100644 --- a/fs/ext4/mmp.c +++ b/fs/ext4/mmp.c @@ -174,8 +174,10 @@ static int kmmpd(void *data) * (s_mmp_update_interval * 60) seconds. */ if (retval) { - if ((failed_writes % 60) == 0) + if ((failed_writes % 60) == 0) { + ext4_set_errno(sb, -retval); ext4_error(sb, "Error writing to MMP block"); + } failed_writes++; }
@@ -206,6 +208,7 @@ static int kmmpd(void *data)
retval = read_mmp_block(sb, &bh_check, mmp_block); if (retval) { + ext4_set_errno(sb, -retval); ext4_error(sb, "error reading MMP data: %d", retval); goto exit_thread; @@ -219,6 +222,7 @@ static int kmmpd(void *data) "Error while updating MMP info. " "The filesystem seems to have been" " multiply mounted."); + ext4_set_errno(sb, EBUSY); ext4_error(sb, "abort"); put_bh(bh_check); retval = -EBUSY; diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index c51156abeec4..6c236bf5b29a 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -155,6 +155,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode, if (ext4_dx_csum_verify(inode, dirent)) set_buffer_verified(bh); else { + ext4_set_errno(inode->i_sb, EFSBADCRC); ext4_error_inode(inode, func, line, block, "Directory index failed checksum"); brelse(bh); @@ -165,6 +166,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode, if (ext4_dirent_csum_verify(inode, dirent)) set_buffer_verified(bh); else { + ext4_set_errno(inode->i_sb, EFSBADCRC); ext4_error_inode(inode, func, line, block, "Directory block failed checksum"); brelse(bh); @@ -1452,6 +1454,7 @@ static struct buffer_head * ext4_find_entry (struct inode *dir, goto next; wait_on_buffer(bh); if (!buffer_uptodate(bh)) { + ext4_set_errno(sb, EIO); EXT4_ERROR_INODE(dir, "reading directory lblock %lu", (unsigned long) block); brelse(bh); @@ -1463,6 +1466,7 @@ static struct buffer_head * ext4_find_entry (struct inode *dir, (struct ext4_dir_entry *)bh->b_data) && !ext4_dirent_csum_verify(dir, (struct ext4_dir_entry *)bh->b_data)) { + ext4_set_errno(sb, EFSBADCRC); EXT4_ERROR_INODE(dir, "checksumming directory " "block %lu", (unsigned long)block); brelse(bh); diff --git a/fs/ext4/super.c b/fs/ext4/super.c index a254d7cf869a..8f643d314923 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -375,6 +375,8 @@ static void __save_error_info(struct super_block *sb, const char *func, ext4_update_tstamp(es, s_last_error_time); strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); es->s_last_error_line = cpu_to_le32(line); + if (es->s_last_error_errcode == 0) + es->s_last_error_errcode = EXT4_ERR_EFSCORRUPTED; if (!es->s_first_error_time) { es->s_first_error_time = es->s_last_error_time; es->s_first_error_time_hi = es->s_last_error_time_hi; @@ -383,6 +385,7 @@ static void __save_error_info(struct super_block *sb, const char *func, es->s_first_error_line = cpu_to_le32(line); es->s_first_error_ino = es->s_last_error_ino; es->s_first_error_block = es->s_last_error_block; + es->s_first_error_errcode = es->s_last_error_errcode; } /* * Start the daily error reporting function if it hasn't been @@ -682,6 +685,66 @@ const char *ext4_decode_error(struct super_block *sb, int errno, return errstr; }
+void ext4_set_errno(struct super_block *sb, int err) +{ + if (err < 0) + err = -err; + + switch (err) { + case EIO: + err = EXT4_ERR_EIO; + break; + case ENOMEM: + err = EXT4_ERR_ENOMEM; + break; + case EFSBADCRC: + err = EXT4_ERR_EFSBADCRC; + break; + case EFSCORRUPTED: + err = EXT4_ERR_EFSCORRUPTED; + break; + case ENOSPC: + err = EXT4_ERR_ENOSPC; + break; + case ENOKEY: + err = EXT4_ERR_ENOKEY; + break; + case EROFS: + err = EXT4_ERR_EROFS; + break; + case EFBIG: + err = EXT4_ERR_EFBIG; + break; + case EEXIST: + err = EXT4_ERR_EEXIST; + break; + case ERANGE: + err = EXT4_ERR_ERANGE; + break; + case EOVERFLOW: + err = EXT4_ERR_EOVERFLOW; + break; + case EBUSY: + err = EXT4_ERR_EBUSY; + break; + case ENOTDIR: + err = EXT4_ERR_ENOTDIR; + break; + case ENOTEMPTY: + err = EXT4_ERR_ENOTEMPTY; + break; + case ESHUTDOWN: + err = EXT4_ERR_ESHUTDOWN; + break; + case EFAULT: + err = EXT4_ERR_EFAULT; + break; + default: + err = EXT4_ERR_UNKNOWN; + } + EXT4_SB(sb)->s_es->s_last_error_errcode = err; +} + /* __ext4_std_error decodes expected errors from journaling functions * automatically and invokes the appropriate error response. */
@@ -706,6 +769,7 @@ void __ext4_std_error(struct super_block *sb, const char *function, sb->s_id, function, line, errstr); }
+ ext4_set_errno(sb, -errno); save_error_info(sb, function, line); ext4_handle_error(sb); } @@ -1033,8 +1097,10 @@ static void ext4_put_super(struct super_block *sb) aborted = is_journal_aborted(sbi->s_journal); err = jbd2_journal_destroy(sbi->s_journal); sbi->s_journal = NULL; - if ((err < 0) && !aborted) + if ((err < 0) && !aborted) { + ext4_set_errno(sb, -err); ext4_abort(sb, "Couldn't clean up the journal"); + } }
ext4_unregister_sysfs(sb); diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 24cf730ba6b0..7781e34c8ce2 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -2886,9 +2886,11 @@ int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); if (IS_ERR(bh)) { error = PTR_ERR(bh); - if (error == -EIO) + if (error == -EIO) { + ext4_set_errno(inode->i_sb, EIO); EXT4_ERROR_INODE(inode, "block %llu read error", EXT4_I(inode)->i_file_acl); + } bh = NULL; goto cleanup; }