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SubjectRe: [PATCH] concurrent block allocation for ext2 against 2.5.64
From
Date

hi!

>>>>> Andreas Dilger (AD) writes:

AD> First of all, thanks for this work, Alex. It's been a long time
AD> in coming. One thing I would wonder about is whether we should
AD> be implementing this in ext2, or in ext3 only. One of the
AD> decisions we made in the past is that we shouldn't necessarily
AD> implement everything in ext2 (especially features that
AD> complicated the code, and are only useful on high-end systems).

well. ext2 in 2.4 have a lot of BKL. ext2 in 2.5 is almost free from
BKL. I think concurrent balloc is just one more step in this direction.

AD> I would suggest just hooking the ext2_group_desc (and the
AD> buffer_head in which it lives) off of the ext2_bg_info array
AD> instead of passing both around explicitly. Since we have
AD> ext2_bg_info as a group_number-indexed array already, this would
AD> essentially mean that wherever we call ext2_get_group_desc() we
AD> could just use sbi->bgi[group].desc (or make
AD> ext2_get_group_desc() do that, if we don't need it to populate
AD> bgi[group].desc in the first place).

it make sense. what about to make it by separate patch?
just to prevent huge concurrent-balloc.diff


>> + root_blocks = bgi->reserved;

AD> I would avoid calling this "root_blocks" and instead just use
AD> "bgi->reserved" or "reserved_blocks" everywhere. The original
AD> intent of these blocks was to reduce fragmentation and not
AD> necessarily reserved-for-root.

fixed

>> + if (free_blocks < root_blocks + count &&
>> !capable(CAP_SYS_RESOURCE) && + sbi->s_resuid != current->fsuid &&
>> + (sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) { + /* + *
>> We are too close to reserve and we are not privileged. + * Can we
>> allocate anything at all? + */ + if (free_blocks > root_blocks) +
>> count = free_blocks - root_blocks; + else { +
>> spin_unlock(&bgi->alloc_lock); + return 0; + }

AD> Per my other email, if we want to handle large files properly by
AD> allowing them to fill the entire group, yet we want to keep the
AD> "reserved blocks" count correct, we could always grab the lock on
AD> the last group and add reserved blocks there. Or, we could just
AD> ignore the reserved blocks count entirely.

hmm. looks I miss something here. reservation is protected by the lock.
what's the problem?

>> unsigned long ext2_count_free_blocks (struct super_block * sb)
>> :
>> - return le32_to_cpu(EXT2_SB(sb)->s_es->s_free_blocks_count); +
>> for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) { + desc =
>> ext2_get_group_desc (sb, i, NULL); + if (!desc) + continue; +
>> desc_count += le16_to_cpu(desc->bg_free_blocks_count); + } +
>> return desc_count; #endif

this code doesn't use lock. if you mean code under EXT2FS_DEBUG then
Andrew already pointed out that this code is broken and should be fixed.

AD> In general, this should be safe to do without a lock, since it is
AD> only used for heuristics (orlov) and statfs (which is out-of-date
AD> as soon as we call it). Are there any other users of
AD> ext2_count_free_blocks() that need a correct value? I suppose
AD> mount/unmount to set s_free_blocks_count, but those probably have
AD> exclusive access to the filesystem anyways.

there is no more user of ext2_count_free_block() who needs precise counter.
find_group_orlov() uses it, but I think this routine doesn't need this
loop is serialized against block reservation.

AD> PS - it looks like you are using spaces for indents instead of
AD> tabs here...

I just use vim ;)

>> + if (le32_to_cpu(es->s_free_blocks_count) != total_free) +
>> printk(KERN_INFO "EXT2-fs: last umount wasn't clean. correct free
>> blocks counter\n");

AD> Probably no need to print this for ext2, since there is already
AD> an "uncleanly unmounted" flag in the superblock, and e2fsck will
AD> have otherwise fixed it up.

fixed. in fact. it was 'debug for myself'.

AD> I'm not sure whether I agree with this or not... If a group ever
AD> exceeds the reserved mark for some reason (e.g. full filesystem)
AD> it will never be able to "improve itself" back to a decent amount
AD> of reserved blocks. That said, you may want to only reduce
AD> "reserved" by "free" in the end, so that the total amount of
AD> reserved blocks is kept constant. need to re-calculate
AD> "per_group" for each loop).

well, I believe reserved blocks may be really _reserved_ at the end of
the fs. simple because of nobody should use them until fs is almost full.

>> extern __inline__ int +ext2_set_bit_atomic (spinlock_t *lock, int
>> nr, volatile void *vaddr)

AD> Please don't use "extern __inline__", as that can cause all sorts
AD> of grief. Either "static inline" or just "extern".

fixed

>> +struct ext2_bg_info { + u8 debts; + spinlock_t alloc_lock; +
>> unsigned int reserved; +};

AD> Please rename this "balloc_lock", as it is likely that we will
AD> get an "ialloc_lock" in the future also.

this makes sense as well.


and corrected patch:



diff -uNr linux/fs/ext2/balloc.c edited/fs/ext2/balloc.c
--- linux/fs/ext2/balloc.c Thu Feb 20 16:18:53 2003
+++ edited/fs/ext2/balloc.c Fri Mar 14 09:54:11 2003
@@ -94,69 +94,62 @@
return bh;
}

-static inline int reserve_blocks(struct super_block *sb, int count)
+static inline int group_reserve_blocks(struct ext2_sb_info *sbi, struct ext2_bg_info *bgi,
+ struct ext2_group_desc *desc,
+ struct buffer_head *bh, int count, int use_reserve)
{
- struct ext2_sb_info * sbi = EXT2_SB(sb);
- struct ext2_super_block * es = sbi->s_es;
- unsigned free_blocks = le32_to_cpu(es->s_free_blocks_count);
- unsigned root_blocks = le32_to_cpu(es->s_r_blocks_count);
+ unsigned free_blocks;
+ unsigned root_blocks;

+ spin_lock(&bgi->balloc_lock);
+
+ free_blocks = le16_to_cpu(desc->bg_free_blocks_count);
if (free_blocks < count)
count = free_blocks;
+ root_blocks = bgi->reserved;

- if (free_blocks < root_blocks + count && !capable(CAP_SYS_RESOURCE) &&
- sbi->s_resuid != current->fsuid &&
- (sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
- /*
- * We are too close to reserve and we are not privileged.
- * Can we allocate anything at all?
- */
- if (free_blocks > root_blocks)
- count = free_blocks - root_blocks;
- else
- return 0;
+ if (free_blocks < bgi->reserved && !use_reserve) {
+ /* don't use reserved blocks */
+ spin_unlock(&bgi->balloc_lock);
+ return 0;
}
-
- es->s_free_blocks_count = cpu_to_le32(free_blocks - count);
- mark_buffer_dirty(sbi->s_sbh);
- sb->s_dirt = 1;
- return count;
-}
-
-static inline void release_blocks(struct super_block *sb, int count)
-{
- if (count) {
- struct ext2_sb_info * sbi = EXT2_SB(sb);
- struct ext2_super_block * es = sbi->s_es;
- unsigned free_blocks = le32_to_cpu(es->s_free_blocks_count);
- es->s_free_blocks_count = cpu_to_le32(free_blocks + count);
- mark_buffer_dirty(sbi->s_sbh);
- sb->s_dirt = 1;
+
+ if (free_blocks < bgi->reserved + count && !capable(CAP_SYS_RESOURCE) &&
+ sbi->s_resuid != current->fsuid &&
+ (sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
+ /*
+ * We are too close to reserve and we are not privileged.
+ * Can we allocate anything at all?
+ */
+ if (free_blocks > bgi->reserved)
+ count = free_blocks - bgi->reserved;
+ else {
+ spin_unlock(&bgi->balloc_lock);
+ return 0;
+ }
}
-}
-
-static inline int group_reserve_blocks(struct ext2_group_desc *desc,
- struct buffer_head *bh, int count)
-{
- unsigned free_blocks;
-
- if (!desc->bg_free_blocks_count)
- return 0;
-
- free_blocks = le16_to_cpu(desc->bg_free_blocks_count);
- if (free_blocks < count)
- count = free_blocks;
desc->bg_free_blocks_count = cpu_to_le16(free_blocks - count);
+
+ spin_unlock(&bgi->balloc_lock);
+
mark_buffer_dirty(bh);
return count;
}

-static inline void group_release_blocks(struct ext2_group_desc *desc,
- struct buffer_head *bh, int count)
+static inline void group_release_blocks(struct ext2_bg_info *bgi,
+ struct ext2_group_desc *desc,
+ struct buffer_head *bh, int count)
{
if (count) {
- unsigned free_blocks = le16_to_cpu(desc->bg_free_blocks_count);
+ unsigned free_blocks;
+
+ spin_lock(&bgi->balloc_lock);
+
+ free_blocks = le16_to_cpu(desc->bg_free_blocks_count);
desc->bg_free_blocks_count = cpu_to_le16(free_blocks + count);
+
+ spin_unlock(&bgi->balloc_lock);
+
mark_buffer_dirty(bh);
}
}
@@ -172,12 +165,11 @@
unsigned long i;
unsigned long overflow;
struct super_block * sb = inode->i_sb;
+ struct ext2_sb_info * sbi = EXT2_SB(sb);
struct ext2_group_desc * desc;
- struct ext2_super_block * es;
+ struct ext2_super_block * es = sbi->s_es;
unsigned freed = 0, group_freed;

- lock_super (sb);
- es = EXT2_SB(sb)->s_es;
if (block < le32_to_cpu(es->s_first_data_block) ||
block + count < block ||
block + count > le32_to_cpu(es->s_blocks_count)) {
@@ -215,16 +207,17 @@
if (in_range (le32_to_cpu(desc->bg_block_bitmap), block, count) ||
in_range (le32_to_cpu(desc->bg_inode_bitmap), block, count) ||
in_range (block, le32_to_cpu(desc->bg_inode_table),
- EXT2_SB(sb)->s_itb_per_group) ||
+ sbi->s_itb_per_group) ||
in_range (block + count - 1, le32_to_cpu(desc->bg_inode_table),
- EXT2_SB(sb)->s_itb_per_group))
+ sbi->s_itb_per_group))
ext2_error (sb, "ext2_free_blocks",
"Freeing blocks in system zones - "
"Block = %lu, count = %lu",
block, count);

for (i = 0, group_freed = 0; i < count; i++) {
- if (!ext2_clear_bit(bit + i, bitmap_bh->b_data))
+ if (!ext2_clear_bit_atomic(&sbi->s_bgi[block_group].balloc_lock,
+ bit + i, (void *) bitmap_bh->b_data))
ext2_error (sb, "ext2_free_blocks",
"bit already cleared for block %lu",
block + i);
@@ -236,7 +229,7 @@
if (sb->s_flags & MS_SYNCHRONOUS)
sync_dirty_buffer(bitmap_bh);

- group_release_blocks(desc, bh2, group_freed);
+ group_release_blocks(&sbi->s_bgi[block_group], desc, bh2, group_freed);
freed += group_freed;

if (overflow) {
@@ -246,18 +239,18 @@
}
error_return:
brelse(bitmap_bh);
- release_blocks(sb, freed);
- unlock_super (sb);
DQUOT_FREE_BLOCK(inode, freed);
}

-static int grab_block(char *map, unsigned size, int goal)
+static int grab_block(spinlock_t *lock, char *map, unsigned size, int goal)
{
int k;
char *p, *r;

if (!ext2_test_bit(goal, map))
goto got_it;
+
+repeat:
if (goal) {
/*
* The goal was occupied; search forward for a free
@@ -297,7 +290,8 @@
}
return -1;
got_it:
- ext2_set_bit(goal, map);
+ if (ext2_set_bit_atomic(lock, goal, (void *) map))
+ goto repeat;
return goal;
}

@@ -319,7 +313,7 @@
int ret_block; /* j */
int bit; /* k */
int target_block; /* tmp */
- int block = 0;
+ int block = 0, use_reserve = 0;
struct super_block *sb = inode->i_sb;
struct ext2_sb_info *sbi = EXT2_SB(sb);
struct ext2_super_block *es = sbi->s_es;
@@ -341,14 +335,7 @@
prealloc_goal--;

dq_alloc = prealloc_goal + 1;
-
- lock_super (sb);
-
- es_alloc = reserve_blocks(sb, dq_alloc);
- if (!es_alloc) {
- *err = -ENOSPC;
- goto out_unlock;
- }
+ es_alloc = dq_alloc;

ext2_debug ("goal=%lu.\n", goal);

@@ -360,7 +347,8 @@
if (!desc)
goto io_error;

- group_alloc = group_reserve_blocks(desc, gdp_bh, es_alloc);
+ group_alloc = group_reserve_blocks(sbi, &sbi->s_bgi[group_no],
+ desc, gdp_bh, es_alloc, 0);
if (group_alloc) {
ret_block = ((goal - le32_to_cpu(es->s_first_data_block)) %
group_size);
@@ -371,11 +359,12 @@

ext2_debug("goal is at %d:%d.\n", group_no, ret_block);

- ret_block = grab_block(bitmap_bh->b_data,
+ ret_block = grab_block(&sbi->s_bgi[group_no].balloc_lock,
+ bitmap_bh->b_data,
group_size, ret_block);
if (ret_block >= 0)
goto got_block;
- group_release_blocks(desc, gdp_bh, group_alloc);
+ group_release_blocks(&sbi->s_bgi[group_no], desc, gdp_bh, group_alloc);
group_alloc = 0;
}

@@ -385,6 +374,7 @@
* Now search the rest of the groups. We assume that
* i and desc correctly point to the last group visited.
*/
+repeat:
for (bit = 0; !group_alloc &&
bit < sbi->s_groups_count; bit++) {
group_no++;
@@ -393,7 +383,16 @@
desc = ext2_get_group_desc(sb, group_no, &gdp_bh);
if (!desc)
goto io_error;
- group_alloc = group_reserve_blocks(desc, gdp_bh, es_alloc);
+ group_alloc = group_reserve_blocks(sbi, &sbi->s_bgi[group_no],
+ desc, gdp_bh, es_alloc, use_reserve);
+ }
+ if (!use_reserve) {
+ /* first time we did not try to allocate
+ * reserved blocks. now it looks like
+ * no more non-reserved blocks left. we
+ * will try to allocate reserved blocks -bzzz */
+ use_reserve = 1;
+ goto repeat;
}
if (bit >= sbi->s_groups_count) {
*err = -ENOSPC;
@@ -404,13 +403,11 @@
if (!bitmap_bh)
goto io_error;

- ret_block = grab_block(bitmap_bh->b_data, group_size, 0);
+ ret_block = grab_block(&sbi->s_bgi[group_no].balloc_lock,
+ bitmap_bh->b_data, group_size, 0);
if (ret_block < 0) {
- ext2_error (sb, "ext2_new_block",
- "Free blocks count corrupted for block group %d",
- group_no);
group_alloc = 0;
- goto io_error;
+ goto repeat;
}

got_block:
@@ -452,7 +449,8 @@
unsigned n;

for (n = 0; n < group_alloc && ++ret_block < group_size; n++) {
- if (ext2_set_bit(ret_block, bitmap_bh->b_data))
+ if (ext2_set_bit_atomic(&sbi->s_bgi[group_no].balloc_lock,
+ ret_block, (void*) bitmap_bh->b_data))
break;
}
*prealloc_block = block + 1;
@@ -471,10 +469,7 @@

*err = 0;
out_release:
- group_release_blocks(desc, gdp_bh, group_alloc);
- release_blocks(sb, es_alloc);
-out_unlock:
- unlock_super (sb);
+ group_release_blocks(&sbi->s_bgi[group_no], desc, gdp_bh, group_alloc);
DQUOT_FREE_BLOCK(inode, dq_alloc);
out:
brelse(bitmap_bh);
@@ -487,11 +482,11 @@

unsigned long ext2_count_free_blocks (struct super_block * sb)
{
-#ifdef EXT2FS_DEBUG
- struct ext2_super_block * es;
- unsigned long desc_count, bitmap_count, x;
struct ext2_group_desc * desc;
+ unsigned long desc_count = 0;
int i;
+#ifdef EXT2FS_DEBUG
+ unsigned long bitmap_count, x;

lock_super (sb);
es = EXT2_SB(sb)->s_es;
@@ -519,7 +514,13 @@
unlock_super (sb);
return bitmap_count;
#else
- return le32_to_cpu(EXT2_SB(sb)->s_es->s_free_blocks_count);
+ for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
+ desc = ext2_get_group_desc (sb, i, NULL);
+ if (!desc)
+ continue;
+ desc_count += le16_to_cpu(desc->bg_free_blocks_count);
+ }
+ return desc_count;
#endif
}

diff -uNr linux/fs/ext2/ialloc.c edited/fs/ext2/ialloc.c
--- linux/fs/ext2/ialloc.c Fri Mar 14 01:53:36 2003
+++ edited/fs/ext2/ialloc.c Thu Mar 13 20:08:58 2003
@@ -278,7 +278,8 @@
int ngroups = sbi->s_groups_count;
int inodes_per_group = EXT2_INODES_PER_GROUP(sb);
int avefreei = le32_to_cpu(es->s_free_inodes_count) / ngroups;
- int avefreeb = le32_to_cpu(es->s_free_blocks_count) / ngroups;
+ int free_blocks = ext2_count_free_blocks(sb);
+ int avefreeb = free_blocks / ngroups;
int blocks_per_dir;
int ndirs = sbi->s_dir_count;
int max_debt, max_dirs, min_blocks, min_inodes;
@@ -320,8 +321,7 @@
goto fallback;
}

- blocks_per_dir = (le32_to_cpu(es->s_blocks_count) -
- le32_to_cpu(es->s_free_blocks_count)) / ndirs;
+ blocks_per_dir = (le32_to_cpu(es->s_blocks_count) - free_blocks) / ndirs;

max_dirs = ndirs / ngroups + inodes_per_group / 16;
min_inodes = avefreei - inodes_per_group / 4;
@@ -340,7 +340,7 @@
desc = ext2_get_group_desc (sb, group, &bh);
if (!desc || !desc->bg_free_inodes_count)
continue;
- if (sbi->s_debts[group] >= max_debt)
+ if (sbi->s_bgi[group].debts >= max_debt)
continue;
if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
continue;
@@ -501,11 +501,11 @@
cpu_to_le32(le32_to_cpu(es->s_free_inodes_count) - 1);

if (S_ISDIR(mode)) {
- if (EXT2_SB(sb)->s_debts[group] < 255)
- EXT2_SB(sb)->s_debts[group]++;
+ if (EXT2_SB(sb)->s_bgi[group].debts < 255)
+ EXT2_SB(sb)->s_bgi[group].debts++;
} else {
- if (EXT2_SB(sb)->s_debts[group])
- EXT2_SB(sb)->s_debts[group]--;
+ if (EXT2_SB(sb)->s_bgi[group].debts)
+ EXT2_SB(sb)->s_bgi[group].debts--;
}

mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
diff -uNr linux/fs/ext2/super.c edited/fs/ext2/super.c
--- linux/fs/ext2/super.c Thu Feb 20 16:18:53 2003
+++ edited/fs/ext2/super.c Fri Mar 14 10:10:09 2003
@@ -141,7 +141,7 @@
if (sbi->s_group_desc[i])
brelse (sbi->s_group_desc[i]);
kfree(sbi->s_group_desc);
- kfree(sbi->s_debts);
+ kfree(sbi->s_bgi);
brelse (sbi->s_sbh);
sb->s_fs_info = NULL;
kfree(sbi);
@@ -464,8 +464,11 @@
int i;
int desc_block = 0;
struct ext2_sb_info *sbi = EXT2_SB(sb);
- unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
+ struct ext2_super_block * es = sbi->s_es;
+ unsigned long block = le32_to_cpu(es->s_first_data_block);
struct ext2_group_desc * gdp = NULL;
+ unsigned int total_free = 0, free;
+ unsigned int reserved = le32_to_cpu(es->s_r_blocks_count);

ext2_debug ("Checking group descriptors");

@@ -504,6 +507,27 @@
block += EXT2_BLOCKS_PER_GROUP(sb);
gdp++;
}
+
+ /* restore free blocks counter in SB -bzzz */
+ es->s_free_blocks_count = total_free = ext2_count_free_blocks(sb);
+
+ /* distribute reserved blocks over groups -bzzz */
+ for(i = sbi->s_groups_count-1; reserved && total_free && i >= 0; i--) {
+ gdp = ext2_get_group_desc (sb, i, NULL);
+ if (!gdp) {
+ ext2_error (sb, "ext2_check_descriptors",
+ "cant get descriptor for group %d", i);
+ return 0;
+ }
+
+ free = le16_to_cpu(gdp->bg_free_blocks_count);
+ if (free > reserved)
+ free = reserved;
+ sbi->s_bgi[i].reserved = free;
+ reserved -= free;
+ total_free -= free;
+ }
+
return 1;
}

@@ -768,13 +792,17 @@
printk ("EXT2-fs: not enough memory\n");
goto failed_mount;
}
- sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts),
+ sbi->s_bgi = kmalloc(sbi->s_groups_count*sizeof(struct ext2_bg_info),
GFP_KERNEL);
- if (!sbi->s_debts) {
+ if (!sbi->s_bgi) {
printk ("EXT2-fs: not enough memory\n");
goto failed_mount_group_desc;
}
- memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts));
+ for (i = 0; i < sbi->s_groups_count; i++) {
+ sbi->s_bgi[i].debts = 0;
+ sbi->s_bgi[i].reserved = 0;
+ spin_lock_init(&sbi->s_bgi[i].balloc_lock);
+ }
for (i = 0; i < db_count; i++) {
block = descriptor_loc(sb, logic_sb_block, i);
sbi->s_group_desc[i] = sb_bread(sb, block);
@@ -820,8 +848,8 @@
brelse(sbi->s_group_desc[i]);
failed_mount_group_desc:
kfree(sbi->s_group_desc);
- if (sbi->s_debts)
- kfree(sbi->s_debts);
+ if (sbi->s_bgi)
+ kfree(sbi->s_bgi);
failed_mount:
brelse(bh);
failed_sbi:
@@ -840,6 +868,7 @@

static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
{
+ es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
es->s_wtime = cpu_to_le32(get_seconds());
mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
@@ -868,6 +897,7 @@
ext2_debug ("setting valid to 0\n");
es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) &
~EXT2_VALID_FS);
+ es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
es->s_mtime = cpu_to_le32(get_seconds());
ext2_sync_super(sb, es);
} else
@@ -929,7 +959,8 @@
static int ext2_statfs (struct super_block * sb, struct statfs * buf)
{
struct ext2_sb_info *sbi = EXT2_SB(sb);
- unsigned long overhead;
+ unsigned long overhead, total_free = 0;
+ struct ext2_group_desc *desc;
int i;

if (test_opt (sb, MINIX_DF))
@@ -950,9 +981,14 @@
* block group descriptors. If the sparse superblocks
* feature is turned on, then not all groups have this.
*/
- for (i = 0; i < sbi->s_groups_count; i++)
+ for (i = 0; i < sbi->s_groups_count; i++) {
overhead += ext2_bg_has_super(sb, i) +
ext2_bg_num_gdb(sb, i);
+
+ /* sum total free blocks -bzzz */
+ desc = ext2_get_group_desc (sb, i, NULL);
+ total_free += le16_to_cpu(desc->bg_free_blocks_count);
+ }

/*
* Every block group has an inode bitmap, a block
@@ -965,7 +1001,7 @@
buf->f_type = EXT2_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead;
- buf->f_bfree = ext2_count_free_blocks (sb);
+ buf->f_bfree = total_free;
buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count);
if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count))
buf->f_bavail = 0;
diff -uNr linux/include/asm-alpha/bitops.h edited/include/asm-alpha/bitops.h
--- linux/include/asm-alpha/bitops.h Fri Mar 14 01:53:36 2003
+++ edited/include/asm-alpha/bitops.h Thu Mar 13 14:10:18 2003
@@ -487,7 +487,9 @@


#define ext2_set_bit __test_and_set_bit
+#define ext2_set_bit_atomic(l,n,a) test_and_set_bit(n,a)
#define ext2_clear_bit __test_and_clear_bit
+#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a)
#define ext2_test_bit test_bit
#define ext2_find_first_zero_bit find_first_zero_bit
#define ext2_find_next_zero_bit find_next_zero_bit
diff -uNr linux/include/asm-arm/bitops.h edited/include/asm-arm/bitops.h
--- linux/include/asm-arm/bitops.h Fri Mar 14 01:53:36 2003
+++ edited/include/asm-arm/bitops.h Thu Mar 13 14:10:46 2003
@@ -357,8 +357,12 @@
*/
#define ext2_set_bit(nr,p) \
__test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
+#define ext2_set_bit_atomic(lock,nr,p) \
+ test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
#define ext2_clear_bit(nr,p) \
__test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
+#define ext2_clear_bit_atomic(lock,nr,p) \
+ test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
#define ext2_test_bit(nr,p) \
__test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
#define ext2_find_first_zero_bit(p,sz) \
diff -uNr linux/include/asm-cris/bitops.h edited/include/asm-cris/bitops.h
--- linux/include/asm-cris/bitops.h Mon Nov 11 06:28:30 2002
+++ edited/include/asm-cris/bitops.h Thu Mar 13 14:11:15 2003
@@ -360,7 +360,9 @@
#define hweight8(x) generic_hweight8(x)

#define ext2_set_bit test_and_set_bit
+#define ext2_set_bit_atomic(l,n,a) test_and_set_bit(n,a)
#define ext2_clear_bit test_and_clear_bit
+#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a)
#define ext2_test_bit test_bit
#define ext2_find_first_zero_bit find_first_zero_bit
#define ext2_find_next_zero_bit find_next_zero_bit
diff -uNr linux/include/asm-i386/bitops.h edited/include/asm-i386/bitops.h
--- linux/include/asm-i386/bitops.h Wed Dec 25 06:03:08 2002
+++ edited/include/asm-i386/bitops.h Thu Mar 13 14:11:32 2003
@@ -479,8 +479,12 @@

#define ext2_set_bit(nr,addr) \
__test_and_set_bit((nr),(unsigned long*)addr)
+#define ext2_set_bit_atomic(lock,nr,addr) \
+ test_and_set_bit((nr),(unsigned long*)addr)
#define ext2_clear_bit(nr, addr) \
__test_and_clear_bit((nr),(unsigned long*)addr)
+#define ext2_clear_bit_atomic(lock,nr, addr) \
+ test_and_clear_bit((nr),(unsigned long*)addr)
#define ext2_test_bit(nr, addr) test_bit((nr),(unsigned long*)addr)
#define ext2_find_first_zero_bit(addr, size) \
find_first_zero_bit((unsigned long*)addr, size)
diff -uNr linux/include/asm-ia64/bitops.h edited/include/asm-ia64/bitops.h
--- linux/include/asm-ia64/bitops.h Thu Feb 20 16:18:21 2003
+++ edited/include/asm-ia64/bitops.h Thu Mar 13 14:12:50 2003
@@ -453,7 +453,9 @@
#define __clear_bit(nr, addr) clear_bit(nr, addr)

#define ext2_set_bit test_and_set_bit
+#define ext2_set_atomic(l,n,a) test_and_set_bit(n,a)
#define ext2_clear_bit test_and_clear_bit
+#define ext2_clear_atomic(l,n,a) test_and_clear_bit(n,a)
#define ext2_test_bit test_bit
#define ext2_find_first_zero_bit find_first_zero_bit
#define ext2_find_next_zero_bit find_next_zero_bit
diff -uNr linux/include/asm-m68k/bitops.h edited/include/asm-m68k/bitops.h
--- linux/include/asm-m68k/bitops.h Mon Nov 11 06:28:33 2002
+++ edited/include/asm-m68k/bitops.h Fri Mar 14 10:00:15 2003
@@ -354,6 +354,16 @@
return retval;
}

+static inline int
+ext2_set_bit_atomic (spinlock_t *lock, int nr, volatile void *vaddr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_set_bit(nr, vaddr);
+ spin_unlock(lock);
+ return ret;
+}
+
extern __inline__ int
ext2_clear_bit (int nr, volatile void *vaddr)
{
@@ -365,6 +375,16 @@
return retval;
}

+static inline int
+ext2_clear_bit_atomic (spinlock_t *lock, int nr, volatile void *vaddr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_clear_bit(nr, vaddr);
+ spin_unlock(lock);
+ return ret;
+}
+
extern __inline__ int
ext2_test_bit (int nr, const volatile void *vaddr)
{
diff -uNr linux/include/asm-m68knommu/bitops.h edited/include/asm-m68knommu/bitops.h
--- linux/include/asm-m68knommu/bitops.h Mon Nov 11 06:28:04 2002
+++ edited/include/asm-m68knommu/bitops.h Fri Mar 14 10:00:52 2003
@@ -387,6 +387,16 @@
return retval;
}

+static inline int ext2_set_bit_atomic(spinlock_t *lock, int nr,
+ volatile void * addr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_set_bit(nr, addr);
+ spin_unlock(lock);
+ return ret;
+}
+
extern __inline__ int ext2_clear_bit(int nr, volatile void * addr)
{
int mask, retval;
@@ -402,6 +412,16 @@
return retval;
}

+static inline int ext2_clear_bit_atomic(spinlock_t *lock, int nr,
+ volatile void * addr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_clear_bit(nr, addr);
+ spin_unlock(lock);
+ return ret;
+}
+
extern __inline__ int ext2_test_bit(int nr, const volatile void * addr)
{
int mask;
diff -uNr linux/include/asm-mips/bitops.h edited/include/asm-mips/bitops.h
--- linux/include/asm-mips/bitops.h Mon Nov 11 06:28:03 2002
+++ edited/include/asm-mips/bitops.h Fri Mar 14 10:01:22 2003
@@ -810,6 +810,15 @@
return retval;
}

+static inline int ext2_set_bit_atomic(spinlock_t * lock, int nr, void * addr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_set_bit(nr, addr);
+ spin_unlock(lock);
+ return ret;
+}
+
extern __inline__ int ext2_clear_bit(int nr, void * addr)
{
int mask, retval, flags;
@@ -824,6 +833,15 @@
return retval;
}

+static inline int ext2_clear_bit_atomic(spinlock_t * lock, int nr, void * addr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_clear_bit(nr, addr);
+ spin_unlock(lock);
+ return ret;
+}
+
extern __inline__ int ext2_test_bit(int nr, const void * addr)
{
int mask;
@@ -890,7 +908,9 @@

/* Native ext2 byte ordering, just collapse using defines. */
#define ext2_set_bit(nr, addr) test_and_set_bit((nr), (addr))
+#define ext2_set_bit_atomic(lock, nr, addr) test_and_set_bit((nr), (addr))
#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr), (addr))
+#define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr), (addr))
#define ext2_test_bit(nr, addr) test_bit((nr), (addr))
#define ext2_find_first_zero_bit(addr, size) find_first_zero_bit((addr), (size))
#define ext2_find_next_zero_bit(addr, size, offset) \
diff -uNr linux/include/asm-mips64/bitops.h edited/include/asm-mips64/bitops.h
--- linux/include/asm-mips64/bitops.h Mon Nov 11 06:28:29 2002
+++ edited/include/asm-mips64/bitops.h Fri Mar 14 10:01:46 2003
@@ -516,6 +516,16 @@
return retval;
}

+static inline int
+ext2_set_bit_atomic(spinlock_t * lock, int nr, void * addr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_set_bit(nr, addr);
+ spin_unlock(lock);
+ return ret;
+}
+
extern inline int
ext2_clear_bit(int nr, void * addr)
{
@@ -531,6 +541,16 @@
return retval;
}

+static inline int
+ext2_clear_bit_atomic(spinlock_t * lock, int nr, void * addr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_clear_bit(nr, addr);
+ spin_unlock(lock);
+ return ret;
+}
+
extern inline int
ext2_test_bit(int nr, const void * addr)
{
@@ -599,7 +619,9 @@

/* Native ext2 byte ordering, just collapse using defines. */
#define ext2_set_bit(nr, addr) test_and_set_bit((nr), (addr))
+#define ext2_set_bit_atomic(lock, nr, addr) test_and_set_bit((nr), (addr))
#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr), (addr))
+#define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr), (addr))
#define ext2_test_bit(nr, addr) test_bit((nr), (addr))
#define ext2_find_first_zero_bit(addr, size) find_first_zero_bit((addr), (size))
#define ext2_find_next_zero_bit(addr, size, offset) \
diff -uNr linux/include/asm-parisc/bitops.h edited/include/asm-parisc/bitops.h
--- linux/include/asm-parisc/bitops.h Thu Feb 20 16:18:21 2003
+++ edited/include/asm-parisc/bitops.h Thu Mar 13 14:29:47 2003
@@ -389,10 +389,14 @@
*/
#ifdef __LP64__
#define ext2_set_bit(nr, addr) test_and_set_bit((nr) ^ 0x38, addr)
+#define ext2_set_bit_atomic(l,nr,addr) test_and_set_bit((nr) ^ 0x38, addr)
#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr) ^ 0x38, addr)
+#define ext2_clear_bit_atomic(l,nr,addr) test_and_clear_bit((nr) ^ 0x38, addr)
#else
#define ext2_set_bit(nr, addr) test_and_set_bit((nr) ^ 0x18, addr)
+#define ext2_set_bit_atomic(l,nr,addr) test_and_set_bit((nr) ^ 0x18, addr)
#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr) ^ 0x18, addr)
+#define ext2_clear_bit_atomic(l,nr,addr) test_and_clear_bit((nr) ^ 0x18, addr)
#endif

#endif /* __KERNEL__ */
diff -uNr linux/include/asm-ppc/bitops.h edited/include/asm-ppc/bitops.h
--- linux/include/asm-ppc/bitops.h Mon Jan 20 05:23:05 2003
+++ edited/include/asm-ppc/bitops.h Thu Mar 13 14:31:00 2003
@@ -392,7 +392,9 @@


#define ext2_set_bit(nr, addr) __test_and_set_bit((nr) ^ 0x18, (unsigned long *)(addr))
+#define ext2_set_bit_atomic(lock, nr, addr) test_and_set_bit((nr) ^ 0x18, (unsigned long *)(addr))
#define ext2_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 0x18, (unsigned long *)(addr))
+#define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr) ^ 0x18, (unsigned long *)(addr))

static __inline__ int ext2_test_bit(int nr, __const__ void * addr)
{
diff -uNr linux/include/asm-ppc64/bitops.h edited/include/asm-ppc64/bitops.h
--- linux/include/asm-ppc64/bitops.h Mon Nov 11 06:28:28 2002
+++ edited/include/asm-ppc64/bitops.h Thu Mar 13 14:32:23 2003
@@ -336,8 +336,12 @@

#define ext2_set_bit(nr,addr) \
__test_and_set_le_bit((nr),(unsigned long*)addr)
+#define ext2_set_bit_atomic(lock, nr,addr) \
+ test_and_set_le_bit((nr),(unsigned long*)addr)
#define ext2_clear_bit(nr, addr) \
__test_and_clear_le_bit((nr),(unsigned long*)addr)
+#define ext2_clear_bit_atomic(lock, nr, addr) \
+ test_and_clear_le_bit((nr),(unsigned long*)addr)
#define ext2_test_bit(nr, addr) test_le_bit((nr),(unsigned long*)addr)
#define ext2_find_first_zero_bit(addr, size) \
find_first_zero_le_bit((unsigned long*)addr, size)
diff -uNr linux/include/asm-s390/bitops.h edited/include/asm-s390/bitops.h
--- linux/include/asm-s390/bitops.h Fri Mar 14 01:53:27 2003
+++ edited/include/asm-s390/bitops.h Thu Mar 13 14:33:55 2003
@@ -805,8 +805,12 @@

#define ext2_set_bit(nr, addr) \
test_and_set_bit((nr)^24, (unsigned long *)addr)
+#define ext2_set_bit_atomic(lock, nr, addr) \
+ test_and_set_bit((nr)^24, (unsigned long *)addr)
#define ext2_clear_bit(nr, addr) \
test_and_clear_bit((nr)^24, (unsigned long *)addr)
+#define ext2_clear_bit_atomic(lock, nr, addr) \
+ test_and_clear_bit((nr)^24, (unsigned long *)addr)
#define ext2_test_bit(nr, addr) \
test_bit((nr)^24, (unsigned long *)addr)

diff -uNr linux/include/asm-s390x/bitops.h edited/include/asm-s390x/bitops.h
--- linux/include/asm-s390x/bitops.h Fri Mar 14 01:53:27 2003
+++ edited/include/asm-s390x/bitops.h Thu Mar 13 14:35:22 2003
@@ -838,8 +838,12 @@

#define ext2_set_bit(nr, addr) \
test_and_set_bit((nr)^56, (unsigned long *)addr)
+#define ext2_set_bit_atomic(lock, nr, addr) \
+ test_and_set_bit((nr)^56, (unsigned long *)addr)
#define ext2_clear_bit(nr, addr) \
test_and_clear_bit((nr)^56, (unsigned long *)addr)
+#define ext2_clear_bit_atomic(lock, nr, addr) \
+ test_and_clear_bit((nr)^56, (unsigned long *)addr)
#define ext2_test_bit(nr, addr) \
test_bit((nr)^56, (unsigned long *)addr)

diff -uNr linux/include/asm-sh/bitops.h edited/include/asm-sh/bitops.h
--- linux/include/asm-sh/bitops.h Mon Nov 11 06:28:02 2002
+++ edited/include/asm-sh/bitops.h Fri Mar 14 10:03:08 2003
@@ -265,6 +265,16 @@
return retval;
}

+static inline int ext2_set_bit_atomic(spinlock_t *lock,
+ int nr, volatile void * addr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_set_bit(nr, addr);
+ spin_unlock(lock);
+ return ret;
+}
+
static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
{
int mask, retval;
@@ -280,6 +290,16 @@
return retval;
}

+static inline int ext2_clear_bit_atomic(spinlock_t *lock,
+ int nr, volatile void * addr)
+{
+ int ret;
+ spin_lock(lock);
+ ret = ext2_clear_bit(nr, addr);
+ spin_unlock(lock);
+ return ret;
+}
+
static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
{
int mask;
diff -uNr linux/include/asm-sparc/bitops.h edited/include/asm-sparc/bitops.h
--- linux/include/asm-sparc/bitops.h Mon Jan 20 05:23:05 2003
+++ edited/include/asm-sparc/bitops.h Thu Mar 13 14:38:54 2003
@@ -454,7 +454,9 @@
find_next_zero_le_bit((addr), (size), 0)

#define ext2_set_bit __test_and_set_le_bit
+#define ext2_set_bit_atomic(l,n,a) test_and_set_le_bit(n,a)
#define ext2_clear_bit __test_and_clear_le_bit
+#define ext2_clear_bit_atomic(l,n,a) test_and_clear_le_bit(n,a)
#define ext2_test_bit test_le_bit
#define ext2_find_first_zero_bit find_first_zero_le_bit
#define ext2_find_next_zero_bit find_next_zero_le_bit
diff -uNr linux/include/asm-sparc64/bitops.h edited/include/asm-sparc64/bitops.h
--- linux/include/asm-sparc64/bitops.h Mon Nov 11 06:28:05 2002
+++ edited/include/asm-sparc64/bitops.h Thu Mar 13 14:43:49 2003
@@ -351,7 +351,9 @@
#ifdef __KERNEL__

#define ext2_set_bit(nr,addr) test_and_set_le_bit((nr),(unsigned long *)(addr))
+#define ext2_set_bit_atomic(lock,nr,addr) test_and_set_le_bit((nr),(unsigned long *)(addr))
#define ext2_clear_bit(nr,addr) test_and_clear_le_bit((nr),(unsigned long *)(addr))
+#define ext2_clear_bit_atomic(lock,nr,addr) test_and_clear_le_bit((nr),(unsigned long *)(addr))
#define ext2_test_bit(nr,addr) test_le_bit((nr),(unsigned long *)(addr))
#define ext2_find_first_zero_bit(addr, size) \
find_first_zero_le_bit((unsigned long *)(addr), (size))
diff -uNr linux/include/asm-v850/bitops.h edited/include/asm-v850/bitops.h
--- linux/include/asm-v850/bitops.h Mon Nov 11 06:28:02 2002
+++ edited/include/asm-v850/bitops.h Thu Mar 13 14:44:48 2003
@@ -252,7 +252,9 @@
#define hweight8(x) generic_hweight8 (x)

#define ext2_set_bit test_and_set_bit
+#define ext2_set_bit_atomic(l,n,a) test_and_set_bit(n,a)
#define ext2_clear_bit test_and_clear_bit
+#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a)
#define ext2_test_bit test_bit
#define ext2_find_first_zero_bit find_first_zero_bit
#define ext2_find_next_zero_bit find_next_zero_bit
diff -uNr linux/include/asm-x86_64/bitops.h edited/include/asm-x86_64/bitops.h
--- linux/include/asm-x86_64/bitops.h Fri Mar 14 01:53:27 2003
+++ edited/include/asm-x86_64/bitops.h Thu Mar 13 14:45:56 2003
@@ -487,8 +487,12 @@

#define ext2_set_bit(nr,addr) \
__test_and_set_bit((nr),(unsigned long*)addr)
+#define ext2_set_bit_atomic(lock,nr,addr) \
+ test_and_set_bit((nr),(unsigned long*)addr)
#define ext2_clear_bit(nr, addr) \
__test_and_clear_bit((nr),(unsigned long*)addr)
+#define ext2_clear_bit_atomic(lock,nr,addr) \
+ test_and_clear_bit((nr),(unsigned long*)addr)
#define ext2_test_bit(nr, addr) test_bit((nr),(unsigned long*)addr)
#define ext2_find_first_zero_bit(addr, size) \
find_first_zero_bit((unsigned long*)addr, size)
diff -uNr linux/include/linux/ext2_fs_sb.h edited/include/linux/ext2_fs_sb.h
--- linux/include/linux/ext2_fs_sb.h Mon Nov 11 06:28:30 2002
+++ edited/include/linux/ext2_fs_sb.h Fri Mar 14 09:51:10 2003
@@ -16,6 +16,12 @@
#ifndef _LINUX_EXT2_FS_SB
#define _LINUX_EXT2_FS_SB

+struct ext2_bg_info {
+ u8 debts;
+ spinlock_t balloc_lock;
+ unsigned int reserved;
+} ____cacheline_aligned_in_smp;
+
/*
* second extended-fs super-block data in memory
*/
@@ -44,7 +50,7 @@
int s_first_ino;
u32 s_next_generation;
unsigned long s_dir_count;
- u8 *s_debts;
+ struct ext2_bg_info *s_bgi;
};

#endif /* _LINUX_EXT2_FS_SB */

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