Hello All,
This series does some code refactoring/cleanups and debug logs improvements
around mb_debug() and ext_debug(). These were found when working over
improving mballoc ENOSPC handling in ext4.
These should be small and stright forward patches for reviewing.
Ritesh Harjani (16):
ext4: mballoc: Do print bb_free info even when it is 0
ext4: mballoc: Refactor ext4_mb_show_ac()
ext4: mballoc: Add more mb_debug() msgs
ext4: mballoc: Correct the mb_debug() format specifier for pa_len var
ext4: mballoc: Fix few other format specifier in mb_debug()
ext4: mballoc: Simplify error handling in ext4_init_mballoc()
ext4: mballoc: Make ext4_mb_use_preallocated() return type as bool
ext4: mballoc: Refactor code inside DOUBLE_CHECK into separate function
ext4: mballoc: Fix possible NULL ptr & remove BUG_ONs from DOUBLE_CHECK
ext4: balloc: Use task_pid_nr() helper
ext4: Use BIT() macro for BH_** state bits
ext4: Improve ext_debug() msg in case of block allocation failure
ext4: Replace EXT_DEBUG with __maybe_unused in ext4_ext_handle_unwritten_extents()
ext4: mballoc: Make mb_debug() implementation to use pr_debug()
ext4: Make ext_debug() implementation to use pr_debug()
ext4: Add process name and pid in ext4_msg()
fs/ext4/Kconfig | 3 +-
fs/ext4/balloc.c | 5 +-
fs/ext4/ext4.h | 26 +++--
fs/ext4/extents.c | 150 +++++++++++++-------------
fs/ext4/inode.c | 15 +--
fs/ext4/mballoc.c | 265 ++++++++++++++++++++++++++--------------------
fs/ext4/mballoc.h | 16 ++-
fs/ext4/super.c | 3 +-
8 files changed, 261 insertions(+), 222 deletions(-)
--
2.21.0
pa->pa_len is an integer. Fix all of the format specifier used in
mb_debug() for pa_len to %d instead of %u.
As such no functionality change in this patch.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/mballoc.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 2e4697e7b945..49de715d04f9 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3720,7 +3720,7 @@ ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
pa->pa_deleted = 0;
pa->pa_type = MB_INODE_PA;
- mb_debug(1, "new inode pa %p: %llu/%u for %u\n", pa,
+ mb_debug(1, "new inode pa %p: %llu/%d for %u\n", pa,
pa->pa_pstart, pa->pa_len, pa->pa_lstart);
trace_ext4_mb_new_inode_pa(ac, pa);
@@ -3780,7 +3780,7 @@ ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
pa->pa_deleted = 0;
pa->pa_type = MB_GROUP_PA;
- mb_debug(1, "new group pa %p: %llu/%u for %u\n", pa,
+ mb_debug(1, "new group pa %p: %llu/%d for %u\n", pa,
pa->pa_pstart, pa->pa_len, pa->pa_lstart);
trace_ext4_mb_new_group_pa(ac, pa);
@@ -3862,10 +3862,10 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
}
if (free != pa->pa_free) {
ext4_msg(e4b->bd_sb, KERN_CRIT,
- "pa %p: logic %lu, phys. %lu, len %lu",
+ "pa %p: logic %lu, phys. %lu, len %d",
pa, (unsigned long) pa->pa_lstart,
(unsigned long) pa->pa_pstart,
- (unsigned long) pa->pa_len);
+ pa->pa_len);
ext4_grp_locked_error(sb, group, 0, 0, "free %u, pa_free %u",
free, pa->pa_free);
/*
@@ -4152,7 +4152,7 @@ static inline void ext4_mb_show_pa(struct super_block *sb)
ext4_get_group_no_and_offset(sb, pa->pa_pstart,
NULL, &start);
spin_unlock(&pa->pa_lock);
- printk(KERN_ERR "PA:%u:%d:%u \n", i,
+ printk(KERN_ERR "PA:%u:%d:%d \n", i,
start, pa->pa_len);
}
ext4_unlock_group(sb, i);
--
2.21.0
Fix few other format specifiers in mb_debug() msgs.
As such no other functionality change in this patch.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/mballoc.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 49de715d04f9..4ada63cf425f 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3280,8 +3280,8 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL;
}
- mb_debug(1, "goal: %u(was %u) blocks at %u\n", (unsigned) size,
- (unsigned) orig_size, (unsigned) start);
+ mb_debug(1, "goal: %lld(was %lld) blocks at %u\n", size, orig_size,
+ start);
}
static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)
@@ -3370,7 +3370,7 @@ static void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac,
BUG_ON(pa->pa_free < len);
pa->pa_free -= len;
- mb_debug(1, "use %llu/%u from inode pa %p\n", start, len, pa);
+ mb_debug(1, "use %llu/%d from inode pa %p\n", start, len, pa);
}
/*
@@ -3577,7 +3577,7 @@ void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
ext4_set_bits(bitmap, start, len);
preallocated += len;
}
- mb_debug(1, "preallocated %u for group %u\n", preallocated, group);
+ mb_debug(1, "preallocated %d for group %u\n", preallocated, group);
}
static void ext4_mb_pa_callback(struct rcu_head *head)
@@ -4173,7 +4173,7 @@ static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
ext4_msg(sb, KERN_ERR, "Can't allocate:"
" Allocation context details:");
- ext4_msg(sb, KERN_ERR, "status %d flags %d",
+ ext4_msg(sb, KERN_ERR, "status %u flags 0x%x",
ac->ac_status, ac->ac_flags);
ext4_msg(sb, KERN_ERR, "orig %lu/%lu/%lu@%lu, "
"goal %lu/%lu/%lu@%lu, "
@@ -4191,7 +4191,7 @@ 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);
- ext4_msg(sb, KERN_ERR, "%d found", ac->ac_found);
+ ext4_msg(sb, KERN_ERR, "%u found", ac->ac_found);
ext4_mb_show_pa(sb);
}
#else
--
2.21.0
This patch simplifies error handling logic in ext4_init_mballoc(),
by adding all the cleanups at one place at the end of that function.
There should be no functionality change in this patch.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/mballoc.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 4ada63cf425f..aaf43c6c08e1 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2913,23 +2913,26 @@ int __init ext4_init_mballoc(void)
ext4_pspace_cachep = KMEM_CACHE(ext4_prealloc_space,
SLAB_RECLAIM_ACCOUNT);
if (ext4_pspace_cachep == NULL)
- return -ENOMEM;
+ goto out;
ext4_ac_cachep = KMEM_CACHE(ext4_allocation_context,
SLAB_RECLAIM_ACCOUNT);
- if (ext4_ac_cachep == NULL) {
- kmem_cache_destroy(ext4_pspace_cachep);
- return -ENOMEM;
- }
+ if (ext4_ac_cachep == NULL)
+ goto out_pa_free;
ext4_free_data_cachep = KMEM_CACHE(ext4_free_data,
SLAB_RECLAIM_ACCOUNT);
- if (ext4_free_data_cachep == NULL) {
- kmem_cache_destroy(ext4_pspace_cachep);
- kmem_cache_destroy(ext4_ac_cachep);
- return -ENOMEM;
- }
+ if (ext4_free_data_cachep == NULL)
+ goto out_ac_free;
+
return 0;
+
+out_ac_free:
+ kmem_cache_destroy(ext4_ac_cachep);
+out_pa_free:
+ kmem_cache_destroy(ext4_pspace_cachep);
+out:
+ return -ENOMEM;
}
void ext4_exit_mballoc(void)
--
2.21.0
This patch implemets mb_group_bb_bitmap_alloc() and
mb_group_bb_bitmap_free() function to remove #ifdef DOUBLE_CHECK macro
and it's related code from inside
ext4_mb_add_groupinfo()/ext4_mb_release().
There should be no functionality change in this patch.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/mballoc.c | 50 +++++++++++++++++++++++++++++++----------------
1 file changed, 33 insertions(+), 17 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 262a53f1d283..3555e72f149c 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -511,6 +511,26 @@ static void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap)
}
}
+static void mb_group_bb_bitmap_alloc(struct super_block *sb,
+ struct ext4_group_info *grp, ext4_group_t group)
+{
+ struct buffer_head *bh;
+
+ grp->bb_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
+ BUG_ON(grp->bb_bitmap == NULL);
+
+ bh = ext4_read_block_bitmap(sb, group);
+ BUG_ON(IS_ERR_OR_NULL(bh));
+
+ memcpy(grp->bb_bitmap, bh->b_data, sb->s_blocksize);
+ put_bh(bh);
+}
+
+static void mb_group_bb_bitmap_free(struct ext4_group_info *grp)
+{
+ kfree(grp->bb_bitmap);
+}
+
#else
static inline void mb_free_blocks_double(struct inode *inode,
struct ext4_buddy *e4b, int first, int count)
@@ -526,6 +546,17 @@ static inline void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap)
{
return;
}
+
+static inline void mb_group_bb_bitmap_alloc(struct super_block *sb,
+ struct ext4_group_info *grp, ext4_group_t group)
+{
+ return;
+}
+
+static inline void mb_group_bb_bitmap_free(struct ext4_group_info *grp)
+{
+ return;
+}
#endif
#ifdef AGGRESSIVE_CHECK
@@ -2456,20 +2487,7 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
meta_group_info[i]->bb_free_root = RB_ROOT;
meta_group_info[i]->bb_largest_free_order = -1; /* uninit */
-#ifdef DOUBLE_CHECK
- {
- struct buffer_head *bh;
- meta_group_info[i]->bb_bitmap =
- kmalloc(sb->s_blocksize, GFP_NOFS);
- BUG_ON(meta_group_info[i]->bb_bitmap == NULL);
- bh = ext4_read_block_bitmap(sb, group);
- BUG_ON(IS_ERR_OR_NULL(bh));
- memcpy(meta_group_info[i]->bb_bitmap, bh->b_data,
- sb->s_blocksize);
- put_bh(bh);
- }
-#endif
-
+ mb_group_bb_bitmap_alloc(sb, meta_group_info[i], group);
return 0;
exit_group_info:
@@ -2736,9 +2754,7 @@ int ext4_mb_release(struct super_block *sb)
for (i = 0; i < ngroups; i++) {
cond_resched();
grinfo = ext4_get_group_info(sb, i);
-#ifdef DOUBLE_CHECK
- kfree(grinfo->bb_bitmap);
-#endif
+ mb_group_bb_bitmap_free(grinfo);
ext4_lock_group(sb, i);
ext4_mb_cleanup_pa(grinfo);
ext4_unlock_group(sb, i);
--
2.21.0
Make sure to check for e4b->bd_info->bb_bitmap == NULL, in
mb_cmp_bitmaps() and return if NULL, to avoid possible NULL ptr
dereference. Similar to how we do this in other ifdef DOUBLE_CHECK
functions.
Also remove the BUG_ON() logic if kmalloc() or ext4_read_block_bitmap()
fails. We should simply mark grp->bb_bitmap as NULL if above happens.
In fact ext4_read_block_bitmap() may even return an error in case of resize
ioctl. Hence remove this BUG_ON logic (fstests ext4/032 may trigger
this).
---
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/mballoc.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 3555e72f149c..c713d06e70b7 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -493,6 +493,8 @@ static void mb_mark_used_double(struct ext4_buddy *e4b, int first, int count)
static void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap)
{
+ if (unlikely(e4b->bd_info->bb_bitmap == NULL))
+ return;
if (memcmp(e4b->bd_info->bb_bitmap, bitmap, e4b->bd_sb->s_blocksize)) {
unsigned char *b1, *b2;
int i;
@@ -517,10 +519,15 @@ static void mb_group_bb_bitmap_alloc(struct super_block *sb,
struct buffer_head *bh;
grp->bb_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
- BUG_ON(grp->bb_bitmap == NULL);
+ if (!grp->bb_bitmap)
+ return;
bh = ext4_read_block_bitmap(sb, group);
- BUG_ON(IS_ERR_OR_NULL(bh));
+ if (IS_ERR_OR_NULL(bh)) {
+ kfree(grp->bb_bitmap);
+ grp->bb_bitmap = NULL;
+ return;
+ }
memcpy(grp->bb_bitmap, bh->b_data, sb->s_blocksize);
put_bh(bh);
--
2.21.0
Use task_pid_nr() function instead of current->pid.
There should be no functionality change in this patch.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/balloc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index a32e5f7b5385..1ba46d87cdf1 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -903,10 +903,11 @@ ext4_fsblk_t ext4_inode_to_goal_block(struct inode *inode)
return bg_start;
if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block)
- colour = (current->pid % 16) *
+ colour = (task_pid_nr(current) % 16) *
(EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16);
else
- colour = (current->pid % 16) * ((last_block - bg_start) / 16);
+ colour = (task_pid_nr(current) % 16) *
+ ((last_block - bg_start) / 16);
return bg_start + colour;
}
--
2.21.0
Simply use BIT() macro for all BH_** state bits instead of open
coding it.
There should be no functionality change in this patch.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/ext4.h | 8 ++++----
fs/ext4/inode.c | 4 ++--
2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 91eb4381cae5..42d7af18157d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -171,10 +171,10 @@ struct ext4_allocation_request {
* well as to store the information returned by ext4_map_blocks(). It
* takes less room on the stack than a struct buffer_head.
*/
-#define EXT4_MAP_NEW (1 << BH_New)
-#define EXT4_MAP_MAPPED (1 << BH_Mapped)
-#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
-#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
+#define EXT4_MAP_NEW BIT(BH_New)
+#define EXT4_MAP_MAPPED BIT(BH_Mapped)
+#define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
+#define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 2a4aae6acdcb..e294abeb7f03 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2078,7 +2078,7 @@ static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)
return err;
}
-#define BH_FLAGS ((1 << BH_Unwritten) | (1 << BH_Delay))
+#define BH_FLAGS (BIT(BH_Unwritten) | BIT(BH_Delay))
/*
* mballoc gives us at most this number of blocks...
@@ -2358,7 +2358,7 @@ static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd)
dioread_nolock = ext4_should_dioread_nolock(inode);
if (dioread_nolock)
get_blocks_flags |= EXT4_GET_BLOCKS_IO_CREATE_EXT;
- if (map->m_flags & (1 << BH_Delay))
+ if (map->m_flags & BIT(BH_Delay))
get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE;
err = ext4_map_blocks(handle, inode, map, get_blocks_flags);
--
2.21.0
mb_debug() msg had only 1 control level for all type of msgs.
And if we enable mballoc_debug then all of those msgs would be enabled.
Instead of adding multiple debug levels for mb_debug() msgs, use
pr_debug() with which we could have finer control to print msgs at all
of different levels (i.e. at file, func, line no.).
Also add process name/pid, superblk id, and other info in mb_debug()
msg. This also kills the mballoc_debug module parameter, since it is
not needed any more.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/Kconfig | 3 +-
fs/ext4/mballoc.c | 104 +++++++++++++++++++++-------------------------
fs/ext4/mballoc.h | 16 +++----
3 files changed, 55 insertions(+), 68 deletions(-)
diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index 2a592e38cdfe..02376ddb0cb5 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -99,8 +99,7 @@ config EXT4_DEBUG
Enables run-time debugging support for the ext4 filesystem.
If you select Y here, then you will be able to turn on debugging
- with a command such as:
- echo 1 > /sys/module/ext4/parameters/mballoc_debug
+ using dynamic debug control for mb_debug() msgs.
config EXT4_KUNIT_TESTS
tristate "KUnit tests for ext4"
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index c713d06e70b7..33a69424942c 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -18,13 +18,6 @@
#include <linux/backing-dev.h>
#include <trace/events/ext4.h>
-#ifdef CONFIG_EXT4_DEBUG
-ushort ext4_mballoc_debug __read_mostly;
-
-module_param_named(mballoc_debug, ext4_mballoc_debug, ushort, 0644);
-MODULE_PARM_DESC(mballoc_debug, "Debugging level for ext4's mballoc");
-#endif
-
/*
* MUSTDO:
* - test ext4_ext_search_left() and ext4_ext_search_right()
@@ -858,14 +851,14 @@ static int ext4_mb_init_cache(struct page *page, char *incore, gfp_t gfp)
char *bitmap;
struct ext4_group_info *grinfo;
- mb_debug(1, "init page %lu\n", page->index);
-
inode = page->mapping->host;
sb = inode->i_sb;
ngroups = ext4_get_groups_count(sb);
blocksize = i_blocksize(inode);
blocks_per_page = PAGE_SIZE / blocksize;
+ mb_debug(sb, "init page %lu\n", page->index);
+
groups_per_page = blocks_per_page >> 1;
if (groups_per_page == 0)
groups_per_page = 1;
@@ -905,7 +898,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore, gfp_t gfp)
bh[i] = NULL;
goto out;
}
- mb_debug(1, "read bitmap for group %u\n", group);
+ mb_debug(sb, "read bitmap for group %u\n", group);
}
/* wait for I/O completion */
@@ -950,7 +943,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore, gfp_t gfp)
if ((first_block + i) & 1) {
/* this is block of buddy */
BUG_ON(incore == NULL);
- mb_debug(1, "put buddy for group %u in page %lu/%x\n",
+ mb_debug(sb, "put buddy for group %u in page %lu/%x\n",
group, page->index, i * blocksize);
trace_ext4_mb_buddy_bitmap_load(sb, group);
grinfo = ext4_get_group_info(sb, group);
@@ -970,7 +963,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore, gfp_t gfp)
} else {
/* this is block of bitmap */
BUG_ON(incore != NULL);
- mb_debug(1, "put bitmap for group %u in page %lu/%x\n",
+ mb_debug(sb, "put bitmap for group %u in page %lu/%x\n",
group, page->index, i * blocksize);
trace_ext4_mb_bitmap_load(sb, group);
@@ -1076,7 +1069,7 @@ int ext4_mb_init_group(struct super_block *sb, ext4_group_t group, gfp_t gfp)
int ret = 0;
might_sleep();
- mb_debug(1, "init group %u\n", group);
+ mb_debug(sb, "init group %u\n", group);
this_grp = ext4_get_group_info(sb, group);
/*
* This ensures that we don't reinit the buddy cache
@@ -1148,7 +1141,7 @@ ext4_mb_load_buddy_gfp(struct super_block *sb, ext4_group_t group,
struct inode *inode = sbi->s_buddy_cache;
might_sleep();
- mb_debug(1, "load group %u\n", group);
+ mb_debug(sb, "load group %u\n", group);
blocks_per_page = PAGE_SIZE / sb->s_blocksize;
grp = ext4_get_group_info(sb, group);
@@ -2299,7 +2292,7 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
if (!err && ac->ac_status != AC_STATUS_FOUND && first_err)
err = first_err;
- mb_debug(1, "Best len %d, origin len %d, ac_status %u, ac_flags 0x%x, cr %d ret %d\n",
+ mb_debug(sb, "Best len %d, origin len %d, ac_status %u, ac_flags 0x%x, cr %d ret %d\n",
ac->ac_b_ex.fe_len, ac->ac_o_ex.fe_len, ac->ac_status,
ac->ac_flags, cr, err);
return err;
@@ -2731,7 +2724,7 @@ int ext4_mb_init(struct super_block *sb)
}
/* need to called with the ext4 group lock held */
-static void ext4_mb_cleanup_pa(struct ext4_group_info *grp)
+static int ext4_mb_cleanup_pa(struct ext4_group_info *grp)
{
struct ext4_prealloc_space *pa;
struct list_head *cur, *tmp;
@@ -2743,9 +2736,7 @@ static void ext4_mb_cleanup_pa(struct ext4_group_info *grp)
count++;
kmem_cache_free(ext4_pspace_cachep, pa);
}
- if (count)
- mb_debug(1, "mballoc: %u PAs left\n", count);
-
+ return count;
}
int ext4_mb_release(struct super_block *sb)
@@ -2756,6 +2747,7 @@ int ext4_mb_release(struct super_block *sb)
struct ext4_group_info *grinfo, ***group_info;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct kmem_cache *cachep = get_groupinfo_cache(sb->s_blocksize_bits);
+ int count;
if (sbi->s_group_info) {
for (i = 0; i < ngroups; i++) {
@@ -2763,7 +2755,10 @@ int ext4_mb_release(struct super_block *sb)
grinfo = ext4_get_group_info(sb, i);
mb_group_bb_bitmap_free(grinfo);
ext4_lock_group(sb, i);
- ext4_mb_cleanup_pa(grinfo);
+ count = ext4_mb_cleanup_pa(grinfo);
+ if (count)
+ mb_debug(sb, "mballoc: %d PAs left\n",
+ count);
ext4_unlock_group(sb, i);
kmem_cache_free(cachep, grinfo);
}
@@ -2836,7 +2831,7 @@ static void ext4_free_data_in_buddy(struct super_block *sb,
struct ext4_group_info *db;
int err, count = 0, count2 = 0;
- mb_debug(1, "gonna free %u blocks in group %u (0x%p):",
+ mb_debug(sb, "gonna free %u blocks in group %u (0x%p):",
entry->efd_count, entry->efd_group, entry);
err = ext4_mb_load_buddy(sb, entry->efd_group, &e4b);
@@ -2876,7 +2871,8 @@ static void ext4_free_data_in_buddy(struct super_block *sb,
kmem_cache_free(ext4_free_data_cachep, entry);
ext4_mb_unload_buddy(&e4b);
- mb_debug(1, "freed %u blocks in %u structures\n", count, count2);
+ mb_debug(sb, "freed %d blocks in %d structures\n", count,
+ count2);
}
/*
@@ -3107,8 +3103,7 @@ static void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac)
BUG_ON(lg == NULL);
ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc;
- mb_debug(1, "#%u: goal %u blocks for locality group\n",
- current->pid, ac->ac_g_ex.fe_len);
+ mb_debug(sb, "goal %u blocks for locality group\n", ac->ac_g_ex.fe_len);
}
/*
@@ -3306,8 +3301,8 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL;
}
- mb_debug(1, "goal: %lld(was %lld) blocks at %u\n", size, orig_size,
- start);
+ mb_debug(ac->ac_sb, "goal: %lld(was %lld) blocks at %u\n", size,
+ orig_size, start);
}
static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)
@@ -3396,7 +3391,7 @@ static void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac,
BUG_ON(pa->pa_free < len);
pa->pa_free -= len;
- mb_debug(1, "use %llu/%d from inode pa %p\n", start, len, pa);
+ mb_debug(ac->ac_sb, "use %llu/%d from inode pa %p\n", start, len, pa);
}
/*
@@ -3420,7 +3415,8 @@ static void ext4_mb_use_group_pa(struct ext4_allocation_context *ac,
* in on-disk bitmap -- see ext4_mb_release_context()
* Other CPUs are prevented from allocating from this pa by lg_mutex
*/
- mb_debug(1, "use %u/%u from group pa %p\n", pa->pa_lstart-len, len, pa);
+ mb_debug(ac->ac_sb, "use %u/%u from group pa %p\n",
+ pa->pa_lstart-len, len, pa);
}
/*
@@ -3603,7 +3599,7 @@ void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
ext4_set_bits(bitmap, start, len);
preallocated += len;
}
- mb_debug(1, "preallocated %d for group %u\n", preallocated, group);
+ mb_debug(sb, "preallocated %d for group %u\n", preallocated, group);
}
static void ext4_mb_pa_callback(struct rcu_head *head)
@@ -3746,8 +3742,8 @@ ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
pa->pa_deleted = 0;
pa->pa_type = MB_INODE_PA;
- mb_debug(1, "new inode pa %p: %llu/%d for %u\n", pa,
- pa->pa_pstart, pa->pa_len, pa->pa_lstart);
+ mb_debug(sb, "new inode pa %p: %llu/%d for %u\n", pa, pa->pa_pstart,
+ pa->pa_len, pa->pa_lstart);
trace_ext4_mb_new_inode_pa(ac, pa);
ext4_mb_use_inode_pa(ac, pa);
@@ -3806,8 +3802,8 @@ ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
pa->pa_deleted = 0;
pa->pa_type = MB_GROUP_PA;
- mb_debug(1, "new group pa %p: %llu/%d for %u\n", pa,
- pa->pa_pstart, pa->pa_len, pa->pa_lstart);
+ mb_debug(sb, "new group pa %p: %llu/%d for %u\n", pa, pa->pa_pstart,
+ pa->pa_len, pa->pa_lstart);
trace_ext4_mb_new_group_pa(ac, pa);
ext4_mb_use_group_pa(ac, pa);
@@ -3874,7 +3870,7 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
if (bit >= end)
break;
next = mb_find_next_bit(bitmap_bh->b_data, end, bit);
- mb_debug(1, " free preallocated %u/%u in group %u\n",
+ mb_debug(sb, "free preallocated %u/%u in group %u\n",
(unsigned) ext4_group_first_block_no(sb, group) + bit,
(unsigned) next - bit, (unsigned) group);
free += next - bit;
@@ -3945,8 +3941,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
int busy = 0;
int free = 0;
- mb_debug(1, "discard preallocation for group %u\n", group);
-
+ mb_debug(sb, "discard preallocation for group %u\n", group);
if (list_empty(&grp->bb_prealloc_list))
goto out_dbg;
@@ -4009,7 +4004,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
/* found anything to free? */
if (list_empty(&list)) {
BUG_ON(free != 0);
- mb_debug(1, "Someone else may have freed PA for this group %u\n",
+ mb_debug(sb, "Someone else may have freed PA for this group %u\n",
group);
goto out;
}
@@ -4036,7 +4031,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
ext4_mb_unload_buddy(&e4b);
put_bh(bitmap_bh);
out_dbg:
- mb_debug(1, "discarded (%d) blocks preallocated for group %u bb_free (%d)\n",
+ mb_debug(sb, "discarded (%d) blocks preallocated for group %u bb_free (%d)\n",
free, group, grp->bb_free);
return free;
}
@@ -4066,7 +4061,8 @@ void ext4_discard_preallocations(struct inode *inode)
return;
}
- mb_debug(1, "discard preallocation for inode %lu\n", inode->i_ino);
+ mb_debug(sb, "discard preallocation for inode %lu\n",
+ inode->i_ino);
trace_ext4_discard_preallocations(inode);
INIT_LIST_HEAD(&list);
@@ -4159,12 +4155,11 @@ static inline void ext4_mb_show_pa(struct super_block *sb)
{
ext4_group_t i, ngroups;
- if (!ext4_mballoc_debug ||
- (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED))
+ if (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)
return;
ngroups = ext4_get_groups_count(sb);
- ext4_msg(sb, KERN_ERR, "groups: ");
+ mb_debug(sb, "groups: ");
for (i = 0; i < ngroups; i++) {
struct ext4_group_info *grp = ext4_get_group_info(sb, i);
struct ext4_prealloc_space *pa;
@@ -4178,30 +4173,27 @@ static inline void ext4_mb_show_pa(struct super_block *sb)
ext4_get_group_no_and_offset(sb, pa->pa_pstart,
NULL, &start);
spin_unlock(&pa->pa_lock);
- printk(KERN_ERR "PA:%u:%d:%d \n", i,
- start, pa->pa_len);
+ mb_debug(sb, "PA:%u:%d:%d\n", i, start,
+ pa->pa_len);
}
ext4_unlock_group(sb, i);
-
- printk(KERN_ERR "%u: %d/%d \n",
- i, grp->bb_free, grp->bb_fragments);
+ mb_debug(sb, "%u: %d/%d\n", i, grp->bb_free,
+ grp->bb_fragments);
}
- printk(KERN_ERR "\n");
}
static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
{
struct super_block *sb = ac->ac_sb;
- if (!ext4_mballoc_debug ||
- (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED))
+ if (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)
return;
- ext4_msg(sb, KERN_ERR, "Can't allocate:"
+ mb_debug(sb, "Can't allocate:"
" Allocation context details:");
- ext4_msg(sb, KERN_ERR, "status %u flags 0x%x",
+ mb_debug(sb, "status %u flags 0x%x",
ac->ac_status, ac->ac_flags);
- ext4_msg(sb, KERN_ERR, "orig %lu/%lu/%lu@%lu, "
+ mb_debug(sb, "orig %lu/%lu/%lu@%lu, "
"goal %lu/%lu/%lu@%lu, "
"best %lu/%lu/%lu@%lu cr %d",
(unsigned long)ac->ac_o_ex.fe_group,
@@ -4217,7 +4209,7 @@ 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);
- ext4_msg(sb, KERN_ERR, "%u found", ac->ac_found);
+ mb_debug(sb, "%u found", ac->ac_found);
ext4_mb_show_pa(sb);
}
#else
@@ -4330,7 +4322,7 @@ ext4_mb_initialize_context(struct ext4_allocation_context *ac,
* locality group. this is a policy, actually */
ext4_mb_group_or_file(ac);
- mb_debug(1, "init ac: %u blocks @ %u, goal %u, flags %x, 2^%d, "
+ mb_debug(sb, "init ac: %u blocks @ %u, goal %u, flags 0x%x, 2^%d, "
"left: %u/%u, right %u/%u to %swritable\n",
(unsigned) ar->len, (unsigned) ar->logical,
(unsigned) ar->goal, ac->ac_flags, ac->ac_2order,
@@ -4351,7 +4343,7 @@ ext4_mb_discard_lg_preallocations(struct super_block *sb,
struct list_head discard_list;
struct ext4_prealloc_space *pa, *tmp;
- mb_debug(1, "discard locality group preallocation\n");
+ mb_debug(sb, "discard locality group preallocation\n");
INIT_LIST_HEAD(&discard_list);
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index 88c98f17e3d9..6b4d17c2935d 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -24,19 +24,15 @@
#include "ext4.h"
/*
+ * mb_debug() dynamic printk msgs could be used to debug mballoc code.
*/
#ifdef CONFIG_EXT4_DEBUG
-extern ushort ext4_mballoc_debug;
-
-#define mb_debug(n, fmt, ...) \
-do { \
- if ((n) <= ext4_mballoc_debug) { \
- printk(KERN_DEBUG "(%s, %d): %s: " fmt, \
- __FILE__, __LINE__, __func__, ##__VA_ARGS__); \
- } \
-} while (0)
+#define mb_debug(sb, fmt, ...) \
+ pr_debug("[%s/%d] EXT4-fs (%s): (%s, %d): %s: " fmt, \
+ current->comm, task_pid_nr(current), sb->s_id, \
+ __FILE__, __LINE__, __func__, ##__VA_ARGS__)
#else
-#define mb_debug(n, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
+#define mb_debug(sb, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
#endif
#define EXT4_MB_HISTORY_ALLOC 1 /* allocation */
--
2.21.0
ext_debug() msgs could be helpful, provided those could be enabled
without recompiling kernel and also if we could selectively enable
only required prints for case by case debugging.
So make ext_debug() implementation use pr_debug().
Also change ext_debug() to be defined with CONFIG_EXT4_DEBUG.
So EXT_DEBUG macro now mostly remain for below 3 functions.
ext4_ext_show_path/leaf/move() (whose print msgs use ext_debug()
which again could be dynamically enabled using pr_debug())
This also changes the ext_debug() to take inode as a parameter
to add inode no. in all of it's msgs.
Prints additional info like process name / pid, superblock id etc.
This also removes any explicit function names passed in ext_debug().
Since ext_debug() on it's own prints file, func and line no.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/Kconfig | 2 +-
fs/ext4/ext4.h | 18 ++++--
fs/ext4/extents.c | 144 ++++++++++++++++++++++------------------------
fs/ext4/inode.c | 11 ++--
4 files changed, 87 insertions(+), 88 deletions(-)
diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index 02376ddb0cb5..cf9e430514c4 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -99,7 +99,7 @@ config EXT4_DEBUG
Enables run-time debugging support for the ext4 filesystem.
If you select Y here, then you will be able to turn on debugging
- using dynamic debug control for mb_debug() msgs.
+ using dynamic debug control for mb_debug() / ext_debug() msgs.
config EXT4_KUNIT_TESTS
tristate "KUnit tests for ext4"
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 42d7af18157d..fb37fb3fe689 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -80,14 +80,22 @@
#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
#endif
+ /*
+ * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
+ */
+#define EXT_DEBUG__
+
/*
- * Turn on EXT_DEBUG to get lots of info about extents operations.
+ * Dynamic printk for controlled extents debugging.
*/
-#define EXT_DEBUG__
-#ifdef EXT_DEBUG
-#define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
+#ifdef CONFIG_EXT4_DEBUG
+#define ext_debug(ino, fmt, ...) \
+ pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
+ current->comm, task_pid_nr(current), \
+ ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
+ __func__, ##__VA_ARGS__)
#else
-#define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
+#define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
#endif
/* data type for block offset of block group */
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index dc980fbc49aa..155f9c6c1279 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -600,22 +600,22 @@ static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
{
int k, l = path->p_depth;
- ext_debug("path:");
+ ext_debug(inode, "path:");
for (k = 0; k <= l; k++, path++) {
if (path->p_idx) {
- ext_debug(" %d->%llu",
+ ext_debug(inode, " %d->%llu",
le32_to_cpu(path->p_idx->ei_block),
ext4_idx_pblock(path->p_idx));
} else if (path->p_ext) {
- ext_debug(" %d:[%d]%d:%llu ",
+ ext_debug(inode, " %d:[%d]%d:%llu ",
le32_to_cpu(path->p_ext->ee_block),
ext4_ext_is_unwritten(path->p_ext),
ext4_ext_get_actual_len(path->p_ext),
ext4_ext_pblock(path->p_ext));
} else
- ext_debug(" []");
+ ext_debug(inode, " []");
}
- ext_debug("\n");
+ ext_debug(inode, "\n");
}
static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path)
@@ -631,14 +631,14 @@ static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path)
eh = path[depth].p_hdr;
ex = EXT_FIRST_EXTENT(eh);
- ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino);
+ ext_debug(inode, "Displaying leaf extents\n");
for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) {
- ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block),
+ ext_debug(inode, "%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block),
ext4_ext_is_unwritten(ex),
ext4_ext_get_actual_len(ex), ext4_ext_pblock(ex));
}
- ext_debug("\n");
+ ext_debug(inode, "\n");
}
static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path,
@@ -651,10 +651,9 @@ static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path,
struct ext4_extent_idx *idx;
idx = path[level].p_idx;
while (idx <= EXT_MAX_INDEX(path[level].p_hdr)) {
- ext_debug("%d: move %d:%llu in new index %llu\n", level,
- le32_to_cpu(idx->ei_block),
- ext4_idx_pblock(idx),
- newblock);
+ ext_debug(inode, "%d: move %d:%llu in new index %llu\n",
+ level, le32_to_cpu(idx->ei_block),
+ ext4_idx_pblock(idx), newblock);
idx++;
}
@@ -663,7 +662,7 @@ static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path,
ex = path[depth].p_ext;
while (ex <= EXT_MAX_EXTENT(path[depth].p_hdr)) {
- ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n",
+ ext_debug(inode, "move %d:%llu:[%d]%d in new leaf %llu\n",
le32_to_cpu(ex->ee_block),
ext4_ext_pblock(ex),
ext4_ext_is_unwritten(ex),
@@ -707,7 +706,7 @@ ext4_ext_binsearch_idx(struct inode *inode,
struct ext4_extent_idx *r, *l, *m;
- ext_debug("binsearch for %u(idx): ", block);
+ ext_debug(inode, "binsearch for %u(idx): ", block);
l = EXT_FIRST_INDEX(eh) + 1;
r = EXT_LAST_INDEX(eh);
@@ -717,13 +716,13 @@ ext4_ext_binsearch_idx(struct inode *inode,
r = m - 1;
else
l = m + 1;
- ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ei_block),
- m, le32_to_cpu(m->ei_block),
- r, le32_to_cpu(r->ei_block));
+ ext_debug(inode, "%p(%u):%p(%u):%p(%u) ", l,
+ le32_to_cpu(l->ei_block), m, le32_to_cpu(m->ei_block),
+ r, le32_to_cpu(r->ei_block));
}
path->p_idx = l - 1;
- ext_debug(" -> %u->%lld ", le32_to_cpu(path->p_idx->ei_block),
+ ext_debug(inode, " -> %u->%lld ", le32_to_cpu(path->p_idx->ei_block),
ext4_idx_pblock(path->p_idx));
#ifdef CHECK_BINSEARCH
@@ -774,7 +773,7 @@ ext4_ext_binsearch(struct inode *inode,
return;
}
- ext_debug("binsearch for %u: ", block);
+ ext_debug(inode, "binsearch for %u: ", block);
l = EXT_FIRST_EXTENT(eh) + 1;
r = EXT_LAST_EXTENT(eh);
@@ -785,13 +784,13 @@ ext4_ext_binsearch(struct inode *inode,
r = m - 1;
else
l = m + 1;
- ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ee_block),
- m, le32_to_cpu(m->ee_block),
- r, le32_to_cpu(r->ee_block));
+ ext_debug(inode, "%p(%u):%p(%u):%p(%u) ", l,
+ le32_to_cpu(l->ee_block), m, le32_to_cpu(m->ee_block),
+ r, le32_to_cpu(r->ee_block));
}
path->p_ext = l - 1;
- ext_debug(" -> %d:%llu:[%d]%d ",
+ ext_debug(inode, " -> %d:%llu:[%d]%d ",
le32_to_cpu(path->p_ext->ee_block),
ext4_ext_pblock(path->p_ext),
ext4_ext_is_unwritten(path->p_ext),
@@ -871,7 +870,7 @@ ext4_find_extent(struct inode *inode, ext4_lblk_t block,
ext4_cache_extents(inode, eh);
/* walk through the tree */
while (i) {
- ext_debug("depth %d: num %d, max %d\n",
+ ext_debug(inode, "depth %d: num %d, max %d\n",
ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
ext4_ext_binsearch_idx(inode, path + ppos, block);
@@ -948,18 +947,20 @@ static int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
if (logical > le32_to_cpu(curp->p_idx->ei_block)) {
/* insert after */
- ext_debug("insert new index %d after: %llu\n", logical, ptr);
+ ext_debug(inode, "insert new index %d after: %llu\n",
+ logical, ptr);
ix = curp->p_idx + 1;
} else {
/* insert before */
- ext_debug("insert new index %d before: %llu\n", logical, ptr);
+ ext_debug(inode, "insert new index %d before: %llu\n",
+ logical, ptr);
ix = curp->p_idx;
}
len = EXT_LAST_INDEX(curp->p_hdr) - ix + 1;
BUG_ON(len < 0);
if (len > 0) {
- ext_debug("insert new index %d: "
+ ext_debug(inode, "insert new index %d: "
"move %d indices from 0x%p to 0x%p\n",
logical, len, ix, ix + 1);
memmove(ix + 1, ix, len * sizeof(struct ext4_extent_idx));
@@ -1022,12 +1023,12 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
}
if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) {
border = path[depth].p_ext[1].ee_block;
- ext_debug("leaf will be split."
+ ext_debug(inode, "leaf will be split."
" next leaf starts at %d\n",
le32_to_cpu(border));
} else {
border = newext->ee_block;
- ext_debug("leaf will be added."
+ ext_debug(inode, "leaf will be added."
" next leaf starts at %d\n",
le32_to_cpu(border));
}
@@ -1049,7 +1050,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
return -ENOMEM;
/* allocate all needed blocks */
- ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
+ ext_debug(inode, "allocate %d blocks for indexes/leaf\n", depth - at);
for (a = 0; a < depth - at; a++) {
newblock = ext4_ext_new_meta_block(handle, inode, path,
newext, &err, flags);
@@ -1135,7 +1136,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
goto cleanup;
}
if (k)
- ext_debug("create %d intermediate indices\n", k);
+ ext_debug(inode, "create %d intermediate indices\n", k);
/* insert new index into current index block */
/* current depth stored in i var */
i = depth - 1;
@@ -1162,7 +1163,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
fidx->ei_block = border;
ext4_idx_store_pblock(fidx, oldblock);
- ext_debug("int.index at %d (block %llu): %u -> %llu\n",
+ ext_debug(inode, "int.index at %d (block %llu): %u -> %llu\n",
i, newblock, le32_to_cpu(border), oldblock);
/* move remainder of path[i] to the new index block */
@@ -1176,7 +1177,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
}
/* start copy indexes */
m = EXT_MAX_INDEX(path[i].p_hdr) - path[i].p_idx++;
- ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx,
+ ext_debug(inode, "cur 0x%p, last 0x%p\n", path[i].p_idx,
EXT_MAX_INDEX(path[i].p_hdr));
ext4_ext_show_move(inode, path, newblock, i);
if (m) {
@@ -1313,7 +1314,7 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
EXT_FIRST_INDEX(neh)->ei_block =
EXT_FIRST_EXTENT(neh)->ee_block;
}
- ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n",
+ ext_debug(inode, "new root: num %d(%d), lblock %d, ptr %llu\n",
le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max),
le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block),
ext4_idx_pblock(EXT_FIRST_INDEX(neh)));
@@ -1955,7 +1956,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
/* Try to append newex to the ex */
if (ext4_can_extents_be_merged(inode, ex, newext)) {
- ext_debug("append [%d]%d block to %u:[%d]%d"
+ ext_debug(inode, "append [%d]%d block to %u:[%d]%d"
"(from %llu)\n",
ext4_ext_is_unwritten(newext),
ext4_ext_get_actual_len(newext),
@@ -1980,7 +1981,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
prepend:
/* Try to prepend newex to the ex */
if (ext4_can_extents_be_merged(inode, newext, ex)) {
- ext_debug("prepend %u[%d]%d block to %u:[%d]%d"
+ ext_debug(inode, "prepend %u[%d]%d block to %u:[%d]%d"
"(from %llu)\n",
le32_to_cpu(newext->ee_block),
ext4_ext_is_unwritten(newext),
@@ -2018,7 +2019,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
if (le32_to_cpu(newext->ee_block) > le32_to_cpu(fex->ee_block))
next = ext4_ext_next_leaf_block(path);
if (next != EXT_MAX_BLOCKS) {
- ext_debug("next leaf block - %u\n", next);
+ ext_debug(inode, "next leaf block - %u\n", next);
BUG_ON(npath != NULL);
npath = ext4_find_extent(inode, next, NULL, 0);
if (IS_ERR(npath))
@@ -2026,12 +2027,12 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
BUG_ON(npath->p_depth != path->p_depth);
eh = npath[depth].p_hdr;
if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) {
- ext_debug("next leaf isn't full(%d)\n",
+ ext_debug(inode, "next leaf isn't full(%d)\n",
le16_to_cpu(eh->eh_entries));
path = npath;
goto has_space;
}
- ext_debug("next leaf has no free space(%d,%d)\n",
+ ext_debug(inode, "next leaf has no free space(%d,%d)\n",
le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
}
@@ -2057,7 +2058,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
if (!nearex) {
/* there is no extent in this leaf, create first one */
- ext_debug("first extent in the leaf: %u:%llu:[%d]%d\n",
+ ext_debug(inode, "first extent in the leaf: %u:%llu:[%d]%d\n",
le32_to_cpu(newext->ee_block),
ext4_ext_pblock(newext),
ext4_ext_is_unwritten(newext),
@@ -2067,7 +2068,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
if (le32_to_cpu(newext->ee_block)
> le32_to_cpu(nearex->ee_block)) {
/* Insert after */
- ext_debug("insert %u:%llu:[%d]%d before: "
+ ext_debug(inode, "insert %u:%llu:[%d]%d before: "
"nearest %p\n",
le32_to_cpu(newext->ee_block),
ext4_ext_pblock(newext),
@@ -2078,7 +2079,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
} else {
/* Insert before */
BUG_ON(newext->ee_block == nearex->ee_block);
- ext_debug("insert %u:%llu:[%d]%d after: "
+ ext_debug(inode, "insert %u:%llu:[%d]%d after: "
"nearest %p\n",
le32_to_cpu(newext->ee_block),
ext4_ext_pblock(newext),
@@ -2088,7 +2089,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
}
len = EXT_LAST_EXTENT(eh) - nearex + 1;
if (len > 0) {
- ext_debug("insert %u:%llu:[%d]%d: "
+ ext_debug(inode, "insert %u:%llu:[%d]%d: "
"move %d extents from 0x%p to 0x%p\n",
le32_to_cpu(newext->ee_block),
ext4_ext_pblock(newext),
@@ -2232,7 +2233,7 @@ ext4_ext_put_gap_in_cache(struct inode *inode, ext4_lblk_t hole_start,
return;
hole_len = min(es.es_lblk - hole_start, hole_len);
}
- ext_debug(" -> %u:%u\n", hole_start, hole_len);
+ ext_debug(inode, " -> %u:%u\n", hole_start, hole_len);
ext4_es_insert_extent(inode, hole_start, hole_len, ~0,
EXTENT_STATUS_HOLE);
}
@@ -2269,7 +2270,7 @@ static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
err = ext4_ext_dirty(handle, inode, path);
if (err)
return err;
- ext_debug("index is empty, remove it, free block %llu\n", leaf);
+ ext_debug(inode, "index is empty, remove it, free block %llu\n", leaf);
trace_ext4_ext_rm_idx(inode, leaf);
ext4_free_blocks(handle, inode, NULL, leaf, 1,
@@ -2548,7 +2549,7 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
ext4_fsblk_t pblk;
/* the header must be checked already in ext4_ext_remove_space() */
- ext_debug("truncate since %u in leaf to %u\n", start, end);
+ ext_debug(inode, "truncate since %u in leaf to %u\n", start, end);
if (!path[depth].p_hdr)
path[depth].p_hdr = ext_block_hdr(path[depth].p_bh);
eh = path[depth].p_hdr;
@@ -2574,7 +2575,7 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
else
unwritten = 0;
- ext_debug("remove ext %u:[%d]%d\n", ex_ee_block,
+ ext_debug(inode, "remove ext %u:[%d]%d\n", ex_ee_block,
unwritten, ex_ee_len);
path[depth].p_ext = ex;
@@ -2582,7 +2583,7 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
b = ex_ee_block+ex_ee_len - 1 < end ?
ex_ee_block+ex_ee_len - 1 : end;
- ext_debug(" border %u:%u\n", a, b);
+ ext_debug(inode, " border %u:%u\n", a, b);
/* If this extent is beyond the end of the hole, skip it */
if (end < ex_ee_block) {
@@ -2691,7 +2692,7 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
if (err)
goto out;
- ext_debug("new extent: %u:%u:%llu\n", ex_ee_block, num,
+ ext_debug(inode, "new extent: %u:%u:%llu\n", ex_ee_block, num,
ext4_ext_pblock(ex));
ex--;
ex_ee_block = le32_to_cpu(ex->ee_block);
@@ -2768,7 +2769,7 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
partial.lblk = 0;
partial.state = initial;
- ext_debug("truncate since %u to %u\n", start, end);
+ ext_debug(inode, "truncate since %u to %u\n", start, end);
/* probably first extent we're gonna free will be last in block */
handle = ext4_journal_start_with_revoke(inode, EXT4_HT_TRUNCATE,
@@ -2909,7 +2910,7 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
/* this is index block */
if (!path[i].p_hdr) {
- ext_debug("initialize header\n");
+ ext_debug(inode, "initialize header\n");
path[i].p_hdr = ext_block_hdr(path[i].p_bh);
}
@@ -2917,7 +2918,7 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
/* this level hasn't been touched yet */
path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr);
path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1;
- ext_debug("init index ptr: hdr 0x%p, num %d\n",
+ ext_debug(inode, "init index ptr: hdr 0x%p, num %d\n",
path[i].p_hdr,
le16_to_cpu(path[i].p_hdr->eh_entries));
} else {
@@ -2925,13 +2926,13 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
path[i].p_idx--;
}
- ext_debug("level %d - index, first 0x%p, cur 0x%p\n",
+ ext_debug(inode, "level %d - index, first 0x%p, cur 0x%p\n",
i, EXT_FIRST_INDEX(path[i].p_hdr),
path[i].p_idx);
if (ext4_ext_more_to_rm(path + i)) {
struct buffer_head *bh;
/* go to the next level */
- ext_debug("move to level %d (block %llu)\n",
+ ext_debug(inode, "move to level %d (block %llu)\n",
i + 1, ext4_idx_pblock(path[i].p_idx));
memset(path + i + 1, 0, sizeof(*path));
bh = read_extent_tree_block(inode,
@@ -2967,7 +2968,7 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
brelse(path[i].p_bh);
path[i].p_bh = NULL;
i--;
- ext_debug("return to level %d\n", i);
+ ext_debug(inode, "return to level %d\n", i);
}
}
@@ -3135,8 +3136,7 @@ static int ext4_split_extent_at(handle_t *handle,
BUG_ON((split_flag & (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)) ==
(EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2));
- ext_debug("ext4_split_extents_at: inode %lu, logical"
- "block %llu\n", inode->i_ino, (unsigned long long)split);
+ ext_debug(inode, "logical block %llu\n", (unsigned long long)split);
ext4_ext_show_leaf(inode, path);
@@ -3369,9 +3369,8 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
int err = 0;
int split_flag = EXT4_EXT_DATA_VALID2;
- ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical"
- "block %llu, max_blocks %u\n", inode->i_ino,
- (unsigned long long)map->m_lblk, map_len);
+ ext_debug(inode, "logical block %llu, max_blocks %u\n",
+ (unsigned long long)map->m_lblk, map_len);
sbi = EXT4_SB(inode->i_sb);
eof_block = (EXT4_I(inode)->i_disksize + inode->i_sb->s_blocksize - 1)
@@ -3623,8 +3622,7 @@ static int ext4_split_convert_extents(handle_t *handle,
unsigned int ee_len;
int split_flag = 0, depth;
- ext_debug("%s: inode %lu, logical block %llu, max_blocks %u\n",
- __func__, inode->i_ino,
+ ext_debug(inode, "logical block %llu, max_blocks %u\n",
(unsigned long long)map->m_lblk, map->m_len);
eof_block = (EXT4_I(inode)->i_disksize + inode->i_sb->s_blocksize - 1)
@@ -3670,8 +3668,7 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
ee_block = le32_to_cpu(ex->ee_block);
ee_len = ext4_ext_get_actual_len(ex);
- ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical"
- "block %llu, max_blocks %u\n", inode->i_ino,
+ ext_debug(inode, "logical block %llu, max_blocks %u\n",
(unsigned long long)ee_block, ee_len);
/* If extent is larger than requested it is a clear sign that we still
@@ -3741,8 +3738,7 @@ convert_initialized_extent(handle_t *handle, struct inode *inode,
ee_block = le32_to_cpu(ex->ee_block);
ee_len = ext4_ext_get_actual_len(ex);
- ext_debug("%s: inode %lu, logical"
- "block %llu, max_blocks %u\n", __func__, inode->i_ino,
+ ext_debug(inode, "logical block %llu, max_blocks %u\n",
(unsigned long long)ee_block, ee_len);
if (ee_block != map->m_lblk || ee_len > map->m_len) {
@@ -3798,10 +3794,9 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
int ret = 0;
int err = 0;
- ext_debug("ext4_ext_handle_unwritten_extents: inode %lu, logical "
- "block %llu, max_blocks %u, flags %x, allocated %u\n",
- inode->i_ino, (unsigned long long)map->m_lblk, map->m_len,
- flags, allocated);
+ ext_debug(inode, "logical block %llu, max_blocks %u, flags 0x%x, allocated %u\n",
+ (unsigned long long)map->m_lblk, map->m_len, flags,
+ allocated);
ext4_ext_show_leaf(inode, path);
/*
@@ -4029,8 +4024,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
struct ext4_allocation_request ar;
ext4_lblk_t cluster_offset;
- ext_debug("blocks %u/%u requested for inode %lu\n",
- map->m_lblk, map->m_len, inode->i_ino);
+ ext_debug(inode, "blocks %u/%u requested\n", map->m_lblk, map->m_len);
trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
/* find extent for this block */
@@ -4077,8 +4071,8 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
newblock = map->m_lblk - ee_block + ee_start;
/* number of remaining blocks in the extent */
allocated = ee_len - (map->m_lblk - ee_block);
- ext_debug("%u fit into %u:%d -> %llu\n", map->m_lblk,
- ee_block, ee_len, newblock);
+ ext_debug(inode, "%u fit into %u:%d -> %llu\n",
+ map->m_lblk, ee_block, ee_len, newblock);
/*
* If the extent is initialized check whether the
@@ -4218,7 +4212,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
goto out2;
allocated_clusters = ar.len;
ar.len = EXT4_C2B(sbi, ar.len) - offset;
- ext_debug("allocate new block: goal %llu, found %llu/%u, requested %u\n",
+ ext_debug(inode, "allocate new block: goal %llu, found %llu/%u, requested %u\n",
ar.goal, newblock, ar.len, allocated);
if (ar.len > allocated)
ar.len = allocated;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5f120af22d48..a39fea85ca59 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -493,9 +493,8 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
#endif
map->m_flags = 0;
- ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u,"
- "logical block %lu\n", inode->i_ino, flags, map->m_len,
- (unsigned long) map->m_lblk);
+ ext_debug(inode, "flag 0x%x, max_blocks %u, logical block %lu\n",
+ flags, map->m_len, (unsigned long) map->m_lblk);
/*
* ext4_map_blocks returns an int, and m_len is an unsigned int
@@ -728,8 +727,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
}
if (retval < 0)
- ext_debug("failed for inode %lu with err %d\n",
- inode->i_ino, retval);
+ ext_debug(inode, "failed with err %d\n", retval);
return retval;
}
@@ -1685,8 +1683,7 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
invalid_block = ~0;
map->m_flags = 0;
- ext_debug("ext4_da_map_blocks(): inode %lu, max_blocks %u,"
- "logical block %lu\n", inode->i_ino, map->m_len,
+ ext_debug(inode, "max_blocks %u, logical block %lu\n", map->m_len,
(unsigned long) map->m_lblk);
/* Lookup extent status tree firstly */
--
2.21.0
Replace EXT_DEBUG with __maybe_unused from inside
ext4_ext_handle_unwritten_extents() function.
There should be no functionality change in this patch.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/extents.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 461600c07316..dc980fbc49aa 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3794,9 +3794,7 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
struct ext4_ext_path **ppath, int flags,
unsigned int allocated, ext4_fsblk_t newblock)
{
-#ifdef EXT_DEBUG
- struct ext4_ext_path *path = *ppath;
-#endif
+ struct ext4_ext_path __maybe_unused *path = *ppath;
int ret = 0;
int err = 0;
--
2.21.0
Change return type of function ext4_mb_use_preallocated() to bool to
better reflect what this function can return.
There should be no functionality change in this patch.
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/mballoc.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index aaf43c6c08e1..262a53f1d283 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3432,7 +3432,7 @@ ext4_mb_check_group_pa(ext4_fsblk_t goal_block,
/*
* search goal blocks in preallocated space
*/
-static noinline_for_stack int
+static noinline_for_stack bool
ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
{
struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
@@ -3444,7 +3444,7 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
/* only data can be preallocated */
if (!(ac->ac_flags & EXT4_MB_HINT_DATA))
- return 0;
+ return false;
/* first, try per-file preallocation */
rcu_read_lock();
@@ -3471,7 +3471,7 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
spin_unlock(&pa->pa_lock);
ac->ac_criteria = 10;
rcu_read_unlock();
- return 1;
+ return true;
}
spin_unlock(&pa->pa_lock);
}
@@ -3479,12 +3479,12 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
/* can we use group allocation? */
if (!(ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC))
- return 0;
+ return false;
/* inode may have no locality group for some reason */
lg = ac->ac_lg;
if (lg == NULL)
- return 0;
+ return false;
order = fls(ac->ac_o_ex.fe_len) - 1;
if (order > PREALLOC_TB_SIZE - 1)
/* The max size of hash table is PREALLOC_TB_SIZE */
@@ -3513,9 +3513,9 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
if (cpa) {
ext4_mb_use_group_pa(ac, cpa);
ac->ac_criteria = 20;
- return 1;
+ return true;
}
- return 0;
+ return false;
}
/*
--
2.21.0
ext4_map_blocks() has ext_debug msg early at the start of function.
We also get ext_debug msg if we could allocate a block from
ext4_ext_map_blocks(). But there is no ext_debug() msg in case of
block allocation failure. So add one along with error code.
Also add more info in ext_debug() msg like how many blocks were allocated
v/s how many were requested in ext4_ext_map_blocks().
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/extents.c | 4 ++--
fs/ext4/inode.c | 4 ++++
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f2b577b315a0..461600c07316 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4218,10 +4218,10 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
newblock = ext4_mb_new_blocks(handle, &ar, &err);
if (!newblock)
goto out2;
- ext_debug("allocate new block: goal %llu, found %llu/%u\n",
- ar.goal, newblock, allocated);
allocated_clusters = ar.len;
ar.len = EXT4_C2B(sbi, ar.len) - offset;
+ ext_debug("allocate new block: goal %llu, found %llu/%u, requested %u\n",
+ ar.goal, newblock, ar.len, allocated);
if (ar.len > allocated)
ar.len = allocated;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e294abeb7f03..5f120af22d48 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -726,6 +726,10 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
return ret;
}
}
+
+ if (retval < 0)
+ ext_debug("failed for inode %lu with err %d\n",
+ inode->i_ino, retval);
return retval;
}
--
2.21.0
This adds process name and pid for ext4_msg().
I found this to be useful. For e.g. below print gives more
info about process name and pid.
[ 7671.131912] [mount/12543] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: acl,user_xattr
Signed-off-by: Ritesh Harjani <[email protected]>
---
fs/ext4/super.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index bf5fcb477f66..5067a47f4f46 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -756,7 +756,8 @@ void __ext4_msg(struct super_block *sb,
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
- printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
+ printk("%s [%s/%d] EXT4-fs (%s): %pV\n", prefix, current->comm,
+ task_pid_nr(current), sb->s_id, &vaf);
va_end(args);
}
--
2.21.0
On Sun, May 10, 2020 at 11:54:56AM +0530, Ritesh Harjani wrote:
> This adds process name and pid for ext4_msg().
> I found this to be useful. For e.g. below print gives more
> info about process name and pid.
>
> [ 7671.131912] [mount/12543] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: acl,user_xattr
I'm not entirely sure about adding the command/pid at the beginning of
the message. The way we do this in ext4_warning and ext4_err is to
print that information like this:
printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
sb->s_id, function, line, current->comm, &vaf);
... and I wonder if it would make more sense to add something like to
ext4_msg(), just out of consistency's sake. Which of the debugging
messages were you finding this to be most helpful?
- Ted
On Sun, May 10, 2020 at 11:54:40AM +0530, Ritesh Harjani wrote:
> Hello All,
>
> This series does some code refactoring/cleanups and debug logs improvements
> around mb_debug() and ext_debug(). These were found when working over
> improving mballoc ENOSPC handling in ext4.
> These should be small and stright forward patches for reviewing.
I've applied all but the last patch ("Add process namd and pid in
ext4_msg"), which I think needs a bit more discussion.
- Ted
Hello Ted,
Sorry about the long delay. Had taken some time off and was tinkering
around with another hobby project.
On 5/21/20 11:56 PM, Theodore Y. Ts'o wrote:
> On Sun, May 10, 2020 at 11:54:56AM +0530, Ritesh Harjani wrote:
>> This adds process name and pid for ext4_msg().
>> I found this to be useful. For e.g. below print gives more
>> info about process name and pid.
>>
>> [ 7671.131912] [mount/12543] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: acl,user_xattr
>
> I'm not entirely sure about adding the command/pid at the beginning of
> the message. The way we do this in ext4_warning and ext4_err is to
> print that information like this:
>
> printk(KERN_CRIT
> "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
> sb->s_id, function, line, current->comm, &vaf);
>
> ... and I wonder if it would make more sense to add something like to
> ext4_msg(), just out of consistency's sake. Which of the debugging
> messages were you finding this to be most helpful?
Well earlier ext4_mb_show_ac() was using ext4_msg() function.
But I changed that to use mb_debug() msg in patch-14 of this series,
since mb_debug() is meant for those debug msgs.
So I am completely ok if we think this patch is unnecessary, that's also
why I kept this patch at the end of the series to check opinion of
others.
FWIW, the mballoc issue which I was seeing was mostly due to a multi-
threaded application. And without name/pid of the process/threads, it
was difficult to identify which debug msgs belonged to which threads.
For this reason I thought such info in ext4_msg() would also help in
future.
Thanks for taking both patch series!
-ritesh