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-rw-r--r--fs/ext2/balloc.c75
-rw-r--r--fs/ext2/ext2.h12
-rw-r--r--fs/ext2/inode.c7
-rw-r--r--fs/ext2/ioctl.c5
-rw-r--r--fs/ext2/super.c13
5 files changed, 53 insertions, 59 deletions
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index e0cc55164505..fa9c951d3471 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -269,7 +269,7 @@ goal_in_my_reservation(struct ext2_reserve_window *rsv, ext2_grpblk_t grp_goal,
ext2_fsblk_t group_first_block, group_last_block;
group_first_block = ext2_group_first_block_no(sb, group);
- group_last_block = group_first_block + EXT2_BLOCKS_PER_GROUP(sb) - 1;
+ group_last_block = ext2_group_last_block_no(sb, group);
if ((rsv->_rsv_start > group_last_block) ||
(rsv->_rsv_end < group_first_block))
@@ -666,37 +666,24 @@ ext2_try_to_allocate(struct super_block *sb, int group,
unsigned long *count,
struct ext2_reserve_window *my_rsv)
{
- ext2_fsblk_t group_first_block;
+ ext2_fsblk_t group_first_block = ext2_group_first_block_no(sb, group);
+ ext2_fsblk_t group_last_block = ext2_group_last_block_no(sb, group);
ext2_grpblk_t start, end;
unsigned long num = 0;
+ start = 0;
+ end = group_last_block - group_first_block + 1;
/* we do allocation within the reservation window if we have a window */
if (my_rsv) {
- group_first_block = ext2_group_first_block_no(sb, group);
if (my_rsv->_rsv_start >= group_first_block)
start = my_rsv->_rsv_start - group_first_block;
- else
- /* reservation window cross group boundary */
- start = 0;
- end = my_rsv->_rsv_end - group_first_block + 1;
- if (end > EXT2_BLOCKS_PER_GROUP(sb))
- /* reservation window crosses group boundary */
- end = EXT2_BLOCKS_PER_GROUP(sb);
- if ((start <= grp_goal) && (grp_goal < end))
- start = grp_goal;
- else
+ if (my_rsv->_rsv_end < group_last_block)
+ end = my_rsv->_rsv_end - group_first_block + 1;
+ if (grp_goal < start || grp_goal >= end)
grp_goal = -1;
- } else {
- if (grp_goal > 0)
- start = grp_goal;
- else
- start = 0;
- end = EXT2_BLOCKS_PER_GROUP(sb);
}
-
BUG_ON(start > EXT2_BLOCKS_PER_GROUP(sb));
-repeat:
if (grp_goal < 0) {
grp_goal = find_next_usable_block(start, bitmap_bh, end);
if (grp_goal < 0)
@@ -711,32 +698,23 @@ repeat:
;
}
}
- start = grp_goal;
- if (ext2_set_bit_atomic(sb_bgl_lock(EXT2_SB(sb), group), grp_goal,
- bitmap_bh->b_data)) {
- /*
- * The block was allocated by another thread, or it was
- * allocated and then freed by another thread
- */
- start++;
- grp_goal++;
- if (start >= end)
- goto fail_access;
- goto repeat;
- }
- num++;
- grp_goal++;
- while (num < *count && grp_goal < end
- && !ext2_set_bit_atomic(sb_bgl_lock(EXT2_SB(sb), group),
+ for (; num < *count && grp_goal < end; grp_goal++) {
+ if (ext2_set_bit_atomic(sb_bgl_lock(EXT2_SB(sb), group),
grp_goal, bitmap_bh->b_data)) {
+ if (num == 0)
+ continue;
+ break;
+ }
num++;
- grp_goal++;
}
+
+ if (num == 0)
+ goto fail_access;
+
*count = num;
return grp_goal - num;
fail_access:
- *count = num;
return -1;
}
@@ -754,10 +732,9 @@ fail_access:
* but we will shift to the place where start_block is,
* then start from there, when looking for a reservable space.
*
- * @size: the target new reservation window size
+ * @sb: the super block.
*
- * @group_first_block: the first block we consider to start
- * the real search from
+ * @start_block: the first block we consider to start the real search from
*
* @last_block:
* the maximum block number that our goal reservable space
@@ -908,7 +885,7 @@ static int alloc_new_reservation(struct ext2_reserve_window_node *my_rsv,
spinlock_t *rsv_lock = &EXT2_SB(sb)->s_rsv_window_lock;
group_first_block = ext2_group_first_block_no(sb, group);
- group_end_block = group_first_block + (EXT2_BLOCKS_PER_GROUP(sb) - 1);
+ group_end_block = ext2_group_last_block_no(sb, group);
if (grp_goal < 0)
start_block = group_first_block;
@@ -1115,7 +1092,7 @@ ext2_try_to_allocate_with_rsv(struct super_block *sb, unsigned int group,
* first block is the block number of the first block in this group
*/
group_first_block = ext2_group_first_block_no(sb, group);
- group_last_block = group_first_block + (EXT2_BLOCKS_PER_GROUP(sb) - 1);
+ group_last_block = ext2_group_last_block_no(sb, group);
/*
* Basically we will allocate a new block from inode's reservation
@@ -1313,6 +1290,13 @@ retry_alloc:
if (free_blocks > 0) {
grp_target_blk = ((goal - le32_to_cpu(es->s_first_data_block)) %
EXT2_BLOCKS_PER_GROUP(sb));
+ /*
+ * In case we retry allocation (due to fs reservation not
+ * working out or fs corruption), the bitmap_bh is non-null
+ * pointer and we have to release it before calling
+ * read_block_bitmap().
+ */
+ brelse(bitmap_bh);
bitmap_bh = read_block_bitmap(sb, group_no);
if (!bitmap_bh)
goto io_error;
@@ -1404,6 +1388,7 @@ allocated:
* use. So we may want to selectively mark some of the blocks
* as free
*/
+ num = *count;
goto retry_alloc;
}
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 10ab238de9a6..8178bd38a9d6 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -813,6 +813,18 @@ ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
}
+static inline ext2_fsblk_t
+ext2_group_last_block_no(struct super_block *sb, unsigned long group_no)
+{
+ struct ext2_sb_info *sbi = EXT2_SB(sb);
+
+ if (group_no == sbi->s_groups_count - 1)
+ return le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
+ else
+ return ext2_group_first_block_no(sb, group_no) +
+ EXT2_BLOCKS_PER_GROUP(sb) - 1;
+}
+
#define ext2_set_bit __test_and_set_bit_le
#define ext2_clear_bit __test_and_clear_bit_le
#define ext2_test_bit test_bit_le
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 467c13ff6b40..119667e65890 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -701,10 +701,13 @@ static int ext2_get_blocks(struct inode *inode,
if (!partial) {
count++;
mutex_unlock(&ei->truncate_mutex);
- if (err)
- goto cleanup;
goto got_it;
}
+
+ if (err) {
+ mutex_unlock(&ei->truncate_mutex);
+ goto cleanup;
+ }
}
/*
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index 1b853fb0b163..32a8d10b579d 100644
--- a/fs/ext2/ioctl.c
+++ b/fs/ext2/ioctl.c
@@ -145,10 +145,13 @@ setversion_out:
if (ei->i_block_alloc_info){
struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
rsv->rsv_goal_size = rsv_window_size;
+ } else {
+ ret = -ENOMEM;
}
+
mutex_unlock(&ei->truncate_mutex);
mnt_drop_write_file(filp);
- return 0;
+ return ret;
}
default:
return -ENOTTY;
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 30c630d73f0f..bcffe25da2f0 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -702,13 +702,7 @@ static int ext2_check_descriptors(struct super_block *sb)
for (i = 0; i < sbi->s_groups_count; i++) {
struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
- ext2_fsblk_t last_block;
-
- if (i == sbi->s_groups_count - 1)
- last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
- else
- last_block = first_block +
- (EXT2_BLOCKS_PER_GROUP(sb) - 1);
+ ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i);
if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
le32_to_cpu(gdp->bg_block_bitmap) > last_block)
@@ -806,7 +800,6 @@ static unsigned long descriptor_loc(struct super_block *sb,
{
struct ext2_sb_info *sbi = EXT2_SB(sb);
unsigned long bg, first_meta_bg;
- int has_super = 0;
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
@@ -814,10 +807,8 @@ static unsigned long descriptor_loc(struct super_block *sb,
nr < first_meta_bg)
return (logic_sb_block + nr + 1);
bg = sbi->s_desc_per_block * nr;
- if (ext2_bg_has_super(sb, bg))
- has_super = 1;
- return ext2_group_first_block_no(sb, bg) + has_super;
+ return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg);
}
static int ext2_fill_super(struct super_block *sb, void *data, int silent)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 20:09:46 +0100