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Message-Id: <B52BE188-5FB1-4F7E-9FB3-5E6A25E58B69@dilger.ca>
Date: Mon, 1 Aug 2011 21:12:04 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: Theodore Ts'o <tytso@....edu>
Cc: Ext4 Developers List <linux-ext4@...r.kernel.org>,
Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH 3/5] ext4: use ext4_msg() instead of printk in mballoc
On 2011-08-01, at 7:13 AM, Theodore Ts'o <tytso@....edu> wrote:
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> ---
> fs/ext4/mballoc.c | 79 ++++++++++++++++++++++++++++-------------------------
> 1 files changed, 42 insertions(+), 37 deletions(-)
Hi Ted, thanks for updating this patch set. One minor issue below.
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index d5021e8..262fa47 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -493,10 +493,11 @@ static void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap)
> b2 = (unsigned char *) bitmap;
> for (i = 0; i < e4b->bd_sb->s_blocksize; i++) {
> if (b1[i] != b2[i]) {
> - printk(KERN_ERR "corruption in group %u "
> - "at byte %u(%u): %x in copy != %x "
> - "on disk/prealloc\n",
> - e4b->bd_group, i, i * 8, b1[i], b2[i]);
> + ext4_msg(e4b->bd_sb, KERN_ERR,
> + "corruption in group %u "
> + "at byte %u(%u): %x in copy != %x "
> + "on disk/prealloc",
> + e4b->bd_group, i, i * 8, b1[i], b2[i]);
> BUG();
> }
> }
> @@ -2224,8 +2225,8 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
> EXT4_DESC_PER_BLOCK_BITS(sb);
> meta_group_info = kmalloc(metalen, GFP_KERNEL);
> if (meta_group_info == NULL) {
> - printk(KERN_ERR "EXT4-fs: can't allocate mem for a "
> - "buddy group\n");
> + ext4_msg(sb, KERN_ERR, "EXT4-fs: can't allocate mem "
> + "for a buddy group");
I don't think ext4_msg() format strings should still have "Ext4-fs:" at the beginning. Isn't that the whole point of using ext4_msg()?
> goto exit_meta_group_info;
> }
> sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)] =
> @@ -2238,7 +2239,7 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
>
> meta_group_info[i] = kmem_cache_alloc(cachep, GFP_KERNEL);
> if (meta_group_info[i] == NULL) {
> - printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n");
> + ext4_msg(sb, KERN_ERR, "EXT4-fs: can't allocate buddy mem");
Ditto.
> goto exit_group_info;
> }
> memset(meta_group_info[i], 0, kmem_cache_size(cachep));
> @@ -2333,12 +2334,12 @@ static int ext4_mb_init_backend(struct super_block *sb)
> * So a two level scheme suffices for now. */
> sbi->s_group_info = ext4_kvzalloc(array_size, GFP_KERNEL);
> if (sbi->s_group_info == NULL) {
> - printk(KERN_ERR "EXT4-fs: can't allocate buddy meta group\n");
> + ext4_msg(sb, KERN_ERR, "can't allocate buddy meta group");
> return -ENOMEM;
> }
> sbi->s_buddy_cache = new_inode(sb);
> if (sbi->s_buddy_cache == NULL) {
> - printk(KERN_ERR "EXT4-fs: can't get new inode\n");
> + ext4_msg(sb, KERN_ERR, "can't get new inode");
> goto err_freesgi;
> }
> sbi->s_buddy_cache->i_ino = get_next_ino();
> @@ -2346,8 +2347,7 @@ static int ext4_mb_init_backend(struct super_block *sb)
> for (i = 0; i < ngroups; i++) {
> desc = ext4_get_group_desc(sb, i, NULL);
> if (desc == NULL) {
> - printk(KERN_ERR
> - "EXT4-fs: can't read descriptor %u\n", i);
> + ext4_msg(sb, KERN_ERR, "can't read descriptor %u", i);
> goto err_freebuddy;
> }
> if (ext4_mb_add_groupinfo(sb, i, desc) != 0)
> @@ -2411,7 +2411,8 @@ static int ext4_groupinfo_create_slab(size_t size)
>
> mutex_unlock(&ext4_grpinfo_slab_create_mutex);
> if (!cachep) {
> - printk(KERN_EMERG "EXT4: no memory for groupinfo slab cache\n");
> + printk(KERN_EMERG,
> + "EXT4-fs: no memory for groupinfo slab cache\n");
This one didn't actually get changed to ext4_msg().
> return -ENOMEM;
> }
>
> @@ -2566,25 +2567,25 @@ int ext4_mb_release(struct super_block *sb)
> if (sbi->s_buddy_cache)
> iput(sbi->s_buddy_cache);
> if (sbi->s_mb_stats) {
> - printk(KERN_INFO
> - "EXT4-fs: mballoc: %u blocks %u reqs (%u success)\n",
> + ext4_msg(sb, KERN_INFO,
> + "mballoc: %u blocks %u reqs (%u success)",
> atomic_read(&sbi->s_bal_allocated),
> atomic_read(&sbi->s_bal_reqs),
> atomic_read(&sbi->s_bal_success));
> - printk(KERN_INFO
> - "EXT4-fs: mballoc: %u extents scanned, %u goal hits, "
> - "%u 2^N hits, %u breaks, %u lost\n",
> + ext4_msg(sb, KERN_INFO,
> + "mballoc: %u extents scanned, %u goal hits, "
> + "%u 2^N hits, %u breaks, %u lost",
> atomic_read(&sbi->s_bal_ex_scanned),
> atomic_read(&sbi->s_bal_goals),
> atomic_read(&sbi->s_bal_2orders),
> atomic_read(&sbi->s_bal_breaks),
> atomic_read(&sbi->s_mb_lost_chunks));
> - printk(KERN_INFO
> - "EXT4-fs: mballoc: %lu generated and it took %Lu\n",
> + ext4_msg(sb, KERN_INFO,
> + "mballoc: %lu generated and it took %Lu",
> sbi->s_mb_buddies_generated,
> sbi->s_mb_generation_time);
> - printk(KERN_INFO
> - "EXT4-fs: mballoc: %u preallocated, %u discarded\n",
> + ext4_msg(sb, KERN_INFO,
> + "mballoc: %u preallocated, %u discarded",
> atomic_read(&sbi->s_mb_preallocated),
> atomic_read(&sbi->s_mb_discarded));
> }
> @@ -3024,9 +3025,10 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
>
> if (start + size <= ac->ac_o_ex.fe_logical &&
> start > ac->ac_o_ex.fe_logical) {
> - printk(KERN_ERR "start %lu, size %lu, fe_logical %lu\n",
> - (unsigned long) start, (unsigned long) size,
> - (unsigned long) ac->ac_o_ex.fe_logical);
> + ext4_msg(ac->ac_sb, KERN_ERR,
> + "start %lu, size %lu, fe_logical %lu",
> + (unsigned long) start, (unsigned long) size,
> + (unsigned long) ac->ac_o_ex.fe_logical);
> }
> BUG_ON(start + size <= ac->ac_o_ex.fe_logical &&
> start > ac->ac_o_ex.fe_logical);
> @@ -3607,10 +3609,11 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
> bit = next + 1;
> }
> if (free != pa->pa_free) {
> - printk(KERN_CRIT "pa %p: logic %lu, phys. %lu, len %lu\n",
> - pa, (unsigned long) pa->pa_lstart,
> - (unsigned long) pa->pa_pstart,
> - (unsigned long) pa->pa_len);
> + ext4_msg(e4b->bd_sb, KERN_CRIT,
> + "pa %p: logic %lu, phys. %lu, len %lu",
> + pa, (unsigned long) pa->pa_lstart,
> + (unsigned long) pa->pa_pstart,
> + (unsigned long) pa->pa_len);
> ext4_grp_locked_error(sb, group, 0, 0, "free %u, pa_free %u",
> free, pa->pa_free);
> /*
> @@ -3798,7 +3801,8 @@ repeat:
> * use preallocation while we're discarding it */
> spin_unlock(&pa->pa_lock);
> spin_unlock(&ei->i_prealloc_lock);
> - printk(KERN_ERR "uh-oh! used pa while discarding\n");
> + ext4_msg(sb, KERN_ERR,
> + "uh-oh! used pa while discarding");
> WARN_ON(1);
> schedule_timeout_uninterruptible(HZ);
> goto repeat;
> @@ -3875,12 +3879,13 @@ static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
> (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED))
> return;
>
> - printk(KERN_ERR "EXT4-fs: Can't allocate:"
> - " Allocation context details:\n");
> - printk(KERN_ERR "EXT4-fs: status %d flags %d\n",
> + ext4_msg(ac->ac_sb, KERN_ERR, "EXT4-fs: Can't allocate:"
Ditto.
> + " Allocation context details:");
> + ext4_msg(ac->ac_sb, KERN_ERR, "EXT4-fs: status %d flags %d",
> ac->ac_status, ac->ac_flags);
> - printk(KERN_ERR "EXT4-fs: orig %lu/%lu/%lu@%lu, goal %lu/%lu/%lu@%lu, "
> - "best %lu/%lu/%lu@%lu cr %d\n",
> + ext4_msg(ac->ac_sb, KERN_ERR, "EXT4-fs: orig %lu/%lu/%lu@%lu, "
Here too.
> + "goal %lu/%lu/%lu@%lu, "
> + "best %lu/%lu/%lu@%lu cr %d",
> (unsigned long)ac->ac_o_ex.fe_group,
> (unsigned long)ac->ac_o_ex.fe_start,
> (unsigned long)ac->ac_o_ex.fe_len,
> @@ -3894,9 +3899,9 @@ static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
> (unsigned long)ac->ac_b_ex.fe_len,
> (unsigned long)ac->ac_b_ex.fe_logical,
> (int)ac->ac_criteria);
> - printk(KERN_ERR "EXT4-fs: %lu scanned, %d found\n", ac->ac_ex_scanned,
> - ac->ac_found);
> - printk(KERN_ERR "EXT4-fs: groups: \n");
> + ext4_msg(ac->ac_sb, KERN_ERR, "EXT4-fs: %lu scanned, %d found",
...
> + ac->ac_ex_scanned, ac->ac_found);
> + ext4_msg(ac->ac_sb, KERN_ERR, "EXT4-fs: groups: ");
> ngroups = ext4_get_groups_count(sb);
> for (i = 0; i < ngroups; i++) {
> struct ext4_group_info *grp = ext4_get_group_info(sb, i);
> --
> 1.7.4.1.22.gec8e1.dirty
>
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