Release 4.10 fs/ext4/super.c

Directory: fs/ext4
/*
 *  linux/fs/ext4/super.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
#include <linux/vfs.h>
#include <linux/random.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/quotaops.h>
#include <linux/seq_file.h>
#include <linux/ctype.h>
#include <linux/log2.h>
#include <linux/crc16.h>
#include <linux/cleancache.h>
#include <linux/uaccess.h>

#include <linux/kthread.h>
#include <linux/freezer.h>

#include "ext4.h"
#include "ext4_extents.h"	/* Needed for trace points definition */
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"
#include "mballoc.h"


#define CREATE_TRACE_POINTS
#include <trace/events/ext4.h>


static struct ext4_lazy_init *ext4_li_info;

static struct mutex ext4_li_mtx;

static struct ratelimit_state ext4_mount_msg_ratelimit;

static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
			     unsigned long journal_devnum);
static int ext4_show_options(struct seq_file *seq, struct dentry *root);
static int ext4_commit_super(struct super_block *sb, int sync);
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es);
static int ext4_sync_fs(struct super_block *sb, int wait);
static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
static int ext4_feature_set_ok(struct super_block *sb, int readonly);
static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
static void ext4_clear_request_list(void);
static struct inode *ext4_get_journal_inode(struct super_block *sb,
					    unsigned int journal_inum);

/*
 * Lock ordering
 *
 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
 * i_mmap_rwsem (inode->i_mmap_rwsem)!
 *
 * page fault path:
 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
 *   page lock -> i_data_sem (rw)
 *
 * buffered write path:
 * sb_start_write -> i_mutex -> mmap_sem
 * sb_start_write -> i_mutex -> transaction start -> page lock ->
 *   i_data_sem (rw)
 *
 * truncate:
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
 *   i_mmap_rwsem (w) -> page lock
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
 *   transaction start -> i_data_sem (rw)
 *
 * direct IO:
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
 *   transaction start -> i_data_sem (rw)
 *
 * writepages:
 * transaction start -> page lock(s) -> i_data_sem (rw)
 */

#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)

static struct file_system_type ext2_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext2",
	.mount		= ext4_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("ext2");
MODULE_ALIAS("ext2");

#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else

#define IS_EXT2_SB(sb) (0)
#endif



static struct file_system_type ext3_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext3",
	.mount		= ext4_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("ext3");
MODULE_ALIAS("ext3");

#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)



static int ext4_verify_csum_type(struct super_block *sb,
				 struct ext4_super_block *es)
{
	if (!ext4_has_feature_metadata_csum(sb))
		return 1;

	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
}

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darrick j. wong darrick j. wong 34 100.00% 2 100.00%
Total 34 100.00% 2 100.00%



static __le32 ext4_superblock_csum(struct super_block *sb,
				   struct ext4_super_block *es)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	int offset = offsetof(struct ext4_super_block, s_checksum);
	__u32 csum;

	csum = ext4_chksum(sbi, ~0, (char *)es, offset);

	return cpu_to_le32(csum);
}

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darrick j. wong darrick j. wong 64 100.00% 1 100.00%
Total 64 100.00% 1 100.00%



static int ext4_superblock_csum_verify(struct super_block *sb,
				       struct ext4_super_block *es)
{
	if (!ext4_has_metadata_csum(sb))
		return 1;

	return es->s_checksum == ext4_superblock_csum(sb, es);
}

Contributors
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darrick j. wong darrick j. wong 37 94.87% 1 33.33%
dmitriy monakhov dmitriy monakhov 1 2.56% 1 33.33%
stephen hemminger stephen hemminger 1 2.56% 1 33.33%
Total 39 100.00% 3 100.00%



void ext4_superblock_csum_set(struct super_block *sb)
{
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	if (!ext4_has_metadata_csum(sb))
		return;

	es->s_checksum = ext4_superblock_csum(sb, es);
}

Contributors
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darrick j. wong darrick j. wong 31 73.81% 1 33.33%
theodore tso theodore tso 10 23.81% 1 33.33%
dmitriy monakhov dmitriy monakhov 1 2.38% 1 33.33%
Total 42 100.00% 3 100.00%



void *ext4_kvmalloc(size_t size, gfp_t flags)
{
	void *ret;

	ret = kmalloc(size, flags | __GFP_NOWARN);
	if (!ret)
		ret = __vmalloc(size, flags, PAGE_KERNEL);
	return ret;
}

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theodore tso theodore tso 44 95.65% 1 50.00%
joe perches joe perches 2 4.35% 1 50.00%
Total 46 100.00% 2 100.00%



void *ext4_kvzalloc(size_t size, gfp_t flags)
{
	void *ret;

	ret = kzalloc(size, flags | __GFP_NOWARN);
	if (!ret)
		ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
	return ret;
}

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theodore tso theodore tso 45 93.75% 1 33.33%
joe perches joe perches 2 4.17% 1 33.33%
mathias krause mathias krause 1 2.08% 1 33.33%
Total 48 100.00% 3 100.00%



ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
{
	return le32_to_cpu(bg->bg_block_bitmap_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
		 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
}

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laurent vivier laurent vivier 30 65.22% 1 33.33%
alexandre ratchov alexandre ratchov 15 32.61% 1 33.33%
aneesh kumar aneesh kumar 1 2.17% 1 33.33%
Total 46 100.00% 3 100.00%



ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
{
	return le32_to_cpu(bg->bg_inode_bitmap_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
}

Contributors
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laurent vivier laurent vivier 30 65.22% 1 33.33%
alexandre ratchov alexandre ratchov 15 32.61% 1 33.33%
aneesh kumar aneesh kumar 1 2.17% 1 33.33%
Total 46 100.00% 3 100.00%



ext4_fsblk_t ext4_inode_table(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le32_to_cpu(bg->bg_inode_table_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
}

Contributors
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laurent vivier laurent vivier 30 65.22% 1 33.33%
alexandre ratchov alexandre ratchov 15 32.61% 1 33.33%
aneesh kumar aneesh kumar 1 2.17% 1 33.33%
Total 46 100.00% 3 100.00%



__u32 ext4_free_group_clusters(struct super_block *sb,
			       struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_free_blocks_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
		 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
}

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aneesh kumar aneesh kumar 45 97.83% 1 50.00%
theodore tso theodore tso 1 2.17% 1 50.00%
Total 46 100.00% 2 100.00%



__u32 ext4_free_inodes_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_free_inodes_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
		 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
}

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aneesh kumar aneesh kumar 46 100.00% 1 100.00%
Total 46 100.00% 1 100.00%



__u32 ext4_used_dirs_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_used_dirs_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
		 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
}

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aneesh kumar aneesh kumar 46 100.00% 1 100.00%
Total 46 100.00% 1 100.00%



__u32 ext4_itable_unused_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_itable_unused_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
		 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
}

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aneesh kumar aneesh kumar 46 100.00% 1 100.00%
Total 46 100.00% 1 100.00%



void ext4_block_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
{
	bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
}

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laurent vivier laurent vivier 34 68.00% 1 33.33%
alexandre ratchov alexandre ratchov 15 30.00% 1 33.33%
aneesh kumar aneesh kumar 1 2.00% 1 33.33%
Total 50 100.00% 3 100.00%



void ext4_inode_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
{
	bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
}

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laurent vivier laurent vivier 34 68.00% 1 33.33%
alexandre ratchov alexandre ratchov 15 30.00% 1 33.33%
aneesh kumar aneesh kumar 1 2.00% 1 33.33%
Total 50 100.00% 3 100.00%



void ext4_inode_table_set(struct super_block *sb,
			  struct ext4_group_desc *bg, ext4_fsblk_t blk)
{
	bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
}

Contributors
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laurent vivier laurent vivier 34 68.00% 1 33.33%
alexandre ratchov alexandre ratchov 15 30.00% 1 33.33%
aneesh kumar aneesh kumar 1 2.00% 1 33.33%
Total 50 100.00% 3 100.00%



void ext4_free_group_clusters_set(struct super_block *sb,
				  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
}

Contributors
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aneesh kumar aneesh kumar 49 98.00% 1 50.00%
theodore tso theodore tso 1 2.00% 1 50.00%
Total 50 100.00% 2 100.00%



void ext4_free_inodes_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
}

Contributors
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aneesh kumar aneesh kumar 50 100.00% 1 100.00%
Total 50 100.00% 1 100.00%



void ext4_used_dirs_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
}

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aneesh kumar aneesh kumar 50 100.00% 1 100.00%
Total 50 100.00% 1 100.00%



void ext4_itable_unused_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
}


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aneesh kumar aneesh kumar 30 60.00% 1 33.33%
laurent vivier laurent vivier 11 22.00% 1 33.33%
alexandre ratchov alexandre ratchov 9 18.00% 1 33.33%
Total 50 100.00% 3 100.00%



static void __save_error_info(struct super_block *sb, const char *func,
			    unsigned int line)
{
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
	if (bdev_read_only(sb->s_bdev))
		return;
	es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
	es->s_last_error_time = cpu_to_le32(get_seconds());
	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_first_error_time) {
		es->s_first_error_time = es->s_last_error_time;
		strncpy(es->s_first_error_func, func,
			sizeof(es->s_first_error_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;
	}
	/*
         * Start the daily error reporting function if it hasn't been
         * started already
         */
	if (!es->s_error_count)
		mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
	le32_add_cpu(&es->s_error_count, 1);
}

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theodore tso theodore tso 150 78.12% 3 50.00%
dave kleikamp dave kleikamp 34 17.71% 1 16.67%
mingming cao mingming cao 5 2.60% 1 16.67%
wei yongjun wei yongjun 3 1.56% 1 16.67%
Total 192 100.00% 6 100.00%



static void save_error_info(struct super_block *sb, const char *func,
			    unsigned int line)
{
	__save_error_info(sb, func, line);
	ext4_commit_super(sb, 1);
}

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theodore tso theodore tso 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%

/*
 * The del_gendisk() function uninitializes the disk-specific data
 * structures, including the bdi structure, without telling anyone
 * else.  Once this happens, any attempt to call mark_buffer_dirty()
 * (for example, by ext4_commit_super), will cause a kernel OOPS.
 * This is a kludge to prevent these oops until we can put in a proper
 * hook in del_gendisk() to inform the VFS and file system layers.
 */


static int block_device_ejected(struct super_block *sb)
{
	struct inode *bd_inode = sb->s_bdev->bd_inode;
	struct backing_dev_info *bdi = inode_to_bdi(bd_inode);

	return bdi->dev == NULL;
}

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theodore tso theodore tso 39 100.00% 1 100.00%
Total 39 100.00% 1 100.00%



static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
{
	struct super_block		*sb = journal->j_private;
	struct ext4_sb_info		*sbi = EXT4_SB(sb);
	int				error = is_journal_aborted(journal);
	struct ext4_journal_cb_entry	*jce;

	BUG_ON(txn->t_state == T_FINISHED);
	spin_lock(&sbi->s_md_lock);
	while (!list_empty(&txn->t_private_list)) {
		jce = list_entry(txn->t_private_list.next,
				 struct ext4_journal_cb_entry, jce_list);
		list_del_init(&jce->jce_list);
		spin_unlock(&sbi->s_md_lock);
		jce->jce_func(sb, jce, error);
		spin_lock(&sbi->s_md_lock);
	}
	spin_unlock(&sbi->s_md_lock);
}

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bobi jam bobi jam 102 75.56% 1 50.00%
dmitriy monakhov dmitriy monakhov 33 24.44% 1 50.00%
Total 135 100.00% 2 100.00%

/* Deal with the reporting of failure conditions on a filesystem such as
 * inconsistencies detected or read IO failures.
 *
 * On ext2, we can store the error state of the filesystem in the
 * superblock.  That is not possible on ext4, because we may have other
 * write ordering constraints on the superblock which prevent us from
 * writing it out straight away; and given that the journal is about to
 * be aborted, we can't rely on the current, or future, transactions to
 * write out the superblock safely.
 *
 * We'll just use the jbd2_journal_abort() error code to record an error in
 * the journal instead.  On recovery, the journal will complain about
 * that error until we've noted it down and cleared it.
 */



static void ext4_handle_error(struct super_block *sb)
{
	if (sb->s_flags & MS_RDONLY)
		return;

	if (!test_opt(sb, ERRORS_CONT)) {
		journal_t *journal = EXT4_SB(sb)->s_journal;

		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
		if (journal)
			jbd2_journal_abort(journal, -EIO);
	}
	if (test_opt(sb, ERRORS_RO)) {
		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
		/*
                 * Make sure updated value of ->s_mount_flags will be visible
                 * before ->s_flags update
                 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
	}
	if (test_opt(sb, ERRORS_PANIC)) {
		if (EXT4_SB(sb)->s_journal &&
		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
			return;
		panic("EXT4-fs (device %s): panic forced after error\n",
			sb->s_id);
	}
}

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dave kleikamp dave kleikamp 87 63.04% 1 12.50%
daeho jeong daeho jeong 26 18.84% 1 12.50%
theodore tso theodore tso 12 8.70% 2 25.00%
eric sandeen eric sandeen 5 3.62% 1 12.50%
mingming cao mingming cao 4 2.90% 2 25.00%
dmitriy monakhov dmitriy monakhov 4 2.90% 1 12.50%
Total 138 100.00% 8 100.00%


#define ext4_error_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),     \
                             "EXT4-fs error")



void __ext4_error(struct super_block *sb, const char *function,
		  unsigned int line, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT
		       "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
		       sb->s_id, function, line, current->comm, &vaf);
		va_end(args);
	}
	save_error_info(sb, function, line);
	ext4_handle_error(sb);
}

Contributors
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dave kleikamp dave kleikamp 52 50.98% 1 14.29%
theodore tso theodore tso 28 27.45% 3 42.86%
joe perches joe perches 20 19.61% 1 14.29%
mingming cao mingming cao 1 0.98% 1 14.29%
eric sandeen eric sandeen 1 0.98% 1 14.29%
Total 102 100.00% 7 100.00%



void __ext4_error_inode(struct inode *inode, const char *function,
			unsigned int line, ext4_fsblk_t block,
			const char *fmt, ...)
{
	va_list args;
	struct va_format vaf;
	struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;

	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
	es->s_last_error_block = cpu_to_le64(block);
	if (ext4_error_ratelimit(inode->i_sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: block %llu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, &vaf);
		else
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, &vaf);
		va_end(args);
	}
	save_error_info(inode->i_sb, function, line);
	ext4_handle_error(inode->i_sb);
}

Contributors
Person Tokens Prop Commits CommitProp
theodore tso theodore tso 94 50.27% 4 57.14%
frank mayhar frank mayhar 61 32.62% 1 14.29%
joe perches joe perches 32 17.11% 2 28.57%
Total 187 100.00% 7 100.00%



void __ext4_error_file(struct file *file, const char *function,
		       unsigned int line, ext4_fsblk_t block,
		       const char *fmt, ...)
{
	va_list args;
	struct va_format vaf;
	struct ext4_super_block *es;
	struct inode *inode = file_inode(file);
	char pathname[80], *path;

	es = EXT4_SB(inode->i_sb)->s_es;
	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
	if (ext4_error_ratelimit(inode->i_sb)) {
		path = file_path(file, pathname, sizeof(pathname));
		if (IS_ERR(path))
			path = "(unknown)";
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "block %llu: comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, path, &vaf);
		else
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, path, &vaf);
		va_end(args);
	}
	save_error_info(inode->i_sb, function, line);
	ext4_handle_error(inode->i_sb);
}

Contributors
Person Tokens Prop Commits CommitProp
frank mayhar frank mayhar 89 39.04% 1 10.00%
theodore tso theodore tso 81 35.53% 4 40.00%
joe perches joe perches 51 22.37% 2 20.00%
dan carpenter dan carpenter 3 1.32% 1 10.00%
al viro al viro 3 1.32% 1 10.00%
miklos szeredi miklos szeredi 1 0.44% 1 10.00%
Total 228 100.00% 10 100.00%



const char *ext4_decode_error(struct super_block *sb, int errno,
			      char nbuf[16])
{
	char *errstr = NULL;

	switch (errno) {
	case -EFSCORRUPTED:
		errstr = "Corrupt filesystem";
		break;
	case -EFSBADCRC:
		errstr = "Filesystem failed CRC";
		break;
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
                 * errors, textualise them now.  Else we just return
                 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

Contributors
Person Tokens Prop Commits CommitProp
dave kleikamp dave kleikamp 111 78.72% 1 20.00%
darrick j. wong darrick j. wong 18 12.77% 1 20.00%
theodore tso theodore tso 9 6.38% 1 20.00%
mingming cao mingming cao 3 2.13% 2 40.00%
Total 141 100.00% 5 100.00%

/* __ext4_std_error decodes expected errors from journaling functions
 * automatically and invokes the appropriate error response.  */



void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
{
	char nbuf[16];
	const char *errstr;

	/* Special case: if the error is EROFS, and we're not already
         * inside a transaction, then there's really no point in logging
         * an error. */
	if (errno == -EROFS && journal_current_handle() == NULL &&
	    (sb->s_flags & MS_RDONLY))
		return;

	if (ext4_error_ratelimit(sb)) {
		errstr = ext4_decode_error(sb, errno, nbuf);
		printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
		       sb->s_id, function, line, errstr);
	}

	save_error_info(sb, function, line);
	ext4_handle_error(sb);
}

Contributors
Person Tokens Prop Commits CommitProp
dave kleikamp dave kleikamp 77 73.33% 1 20.00%
theodore tso theodore tso 25 23.81% 3 60.00%
mingming cao mingming cao 3 2.86% 1 20.00%
Total 105 100.00% 5 100.00%

/*
 * ext4_abort is a much stronger failure handler than ext4_error.  The
 * abort function may be used to deal with unrecoverable failures such
 * as journal IO errors or ENOMEM at a critical moment in log management.
 *
 * We unconditionally force the filesystem into an ABORT|READONLY state,
 * unless the error response on the fs has been set to panic in which
 * case we take the easy way out and panic immediately.
 */



void __ext4_abort(struct super_block *sb, const char *function,
		unsigned int line, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	save_error_info(sb, function, line);
	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &
	Person	Tokens	Prop	Commits	CommitProp
darrick j. wong	darrick j. wong	34	100.00%	2	100.00%
	Total	34	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 fs/ext4/super.c

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