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btrfs: make btrfs_start_delalloc_root's nr argument a long

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It's currently u64 which gets instantly translated either to LONG_MAX
(if U64_MAX is passed) or cast to an unsigned long (which is in fact,
wrong because writeback_control::nr_to_write is a signed, long type).

Just convert the function's argument to be long time which obviates the
need to manually convert u64 value to a long. Adjust all call sites
which pass U64_MAX to pass LONG_MAX. Finally ensure that in
shrink_delalloc the u64 is converted to a long without overflowing,
resulting in a negative number.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2021-01-11 12:58:11 +02:00 committed by David Sterba
parent 9c4a062a94
commit 9db4dc241e
5 changed files with 8 additions and 7 deletions
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2
fs/btrfs/ctree.h
View file

@ -3100,7 +3100,7 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
u32 min_type);
int btrfs_start_delalloc_snapshot(struct btrfs_root *root);
int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, u64 nr,
int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
bool in_reclaim_context);
int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
unsigned int extra_bits,

2
fs/btrfs/dev-replace.c
View file

@ -715,7 +715,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
* flush all outstanding I/O and inode extent mappings before the
* copy operation is declared as being finished
*/
ret = btrfs_start_delalloc_roots(fs_info, U64_MAX, false);
ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false);
if (ret) {
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
return ret;

6
fs/btrfs/inode.c
View file

@ -9489,11 +9489,11 @@ int btrfs_start_delalloc_snapshot(struct btrfs_root *root)
return start_delalloc_inodes(root, &wbc, true, false);
}
int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, u64 nr,
int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr,
bool in_reclaim_context)
{
struct writeback_control wbc = {
.nr_to_write = (nr == U64_MAX) ? LONG_MAX : (unsigned long)nr,
.nr_to_write = nr,
.sync_mode = WB_SYNC_NONE,
.range_start = 0,
.range_end = LLONG_MAX,
@ -9515,7 +9515,7 @@ int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, u64 nr,
* Reset nr_to_write here so we know that we're doing a full
* flush.
*/
if (nr == U64_MAX)
if (nr == LONG_MAX)
wbc.nr_to_write = LONG_MAX;
root = list_first_entry(&splice, struct btrfs_root,

2
fs/btrfs/ioctl.c
View file

@ -4946,7 +4946,7 @@ long btrfs_ioctl(struct file *file, unsigned int
case BTRFS_IOC_SYNC: {
int ret;
ret = btrfs_start_delalloc_roots(fs_info, U64_MAX, false);
ret = btrfs_start_delalloc_roots(fs_info, LONG_MAX, false);
if (ret)
return ret;
ret = btrfs_sync_fs(inode->i_sb, 1);

3
fs/btrfs/space-info.c
View file

@ -532,7 +532,8 @@ static void shrink_delalloc(struct btrfs_fs_info *fs_info,
loops = 0;
while ((delalloc_bytes || dio_bytes) && loops < 3) {
u64 nr_pages = min(delalloc_bytes, to_reclaim) >> PAGE_SHIFT;
u64 temp = min(delalloc_bytes, to_reclaim) >> PAGE_SHIFT;
long nr_pages = min_t(u64, temp, LONG_MAX);
btrfs_start_delalloc_roots(fs_info, nr_pages, true);