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-rw-r--r--fs/logfs/readwrite.c34
1 files changed, 26 insertions, 8 deletions
diff --git a/fs/logfs/readwrite.c b/fs/logfs/readwrite.c
index aca6c56..7e3a1e5 100644
--- a/fs/logfs/readwrite.c
+++ b/fs/logfs/readwrite.c
@@ -1837,19 +1837,37 @@ static int __logfs_truncate(struct inode *inode, u64 size)
return logfs_truncate_direct(inode, size);
}
-int logfs_truncate(struct inode *inode, u64 size)
+/*
+ * Truncate, by changing the segment file, can consume a fair amount
+ * of resources. So back off from time to time and do some GC.
+ * 8 or 2048 blocks should be well within safety limits even if
+ * every single block resided in a different segment.
+ */
+#define TRUNCATE_STEP (8 * 1024 * 1024)
+int logfs_truncate(struct inode *inode, u64 target)
{
struct super_block *sb = inode->i_sb;
- int err;
+ u64 size = i_size_read(inode);
+ int err = 0;
- logfs_get_wblocks(sb, NULL, 1);
- err = __logfs_truncate(inode, size);
- if (!err)
- err = __logfs_write_inode(inode, 0);
- logfs_put_wblocks(sb, NULL, 1);
+ size = ALIGN(size, TRUNCATE_STEP);
+ while (size > target) {
+ if (size > TRUNCATE_STEP)
+ size -= TRUNCATE_STEP;
+ else
+ size = 0;
+ if (size < target)
+ size = target;
+
+ logfs_get_wblocks(sb, NULL, 1);
+ err = __logfs_truncate(inode, target);
+ if (!err)
+ err = __logfs_write_inode(inode, 0);
+ logfs_put_wblocks(sb, NULL, 1);
+ }
if (!err)
- err = vmtruncate(inode, size);
+ err = vmtruncate(inode, target);
/* I don't trust error recovery yet. */
WARN_ON(err);
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