From: Nikolay Borisov nborisov@suse.com
[ Upstream commit 9db4dc241e87fccd8301357d5ef908f40b50f2e3 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/ctree.h | 2 +- fs/btrfs/dev-replace.c | 2 +- fs/btrfs/inode.c | 6 +++--- fs/btrfs/ioctl.c | 2 +- fs/btrfs/space-info.c | 3 ++- 5 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 30ea9780725ff..2d1cec2e7f754 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3004,7 +3004,7 @@ 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, diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index d297804631829..711b24613c22b 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -703,7 +703,7 @@ 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; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index acc47e2ffb46b..b0770288fdcdd 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -9485,11 +9485,11 @@ 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, @@ -9511,7 +9511,7 @@ 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, diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index bd46e107f955e..5122961b35f41 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -4940,7 +4940,7 @@ 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); diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c index e8347461c8ddd..84fb94e78a8ff 100644 --- a/fs/btrfs/space-info.c +++ b/fs/btrfs/space-info.c @@ -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);