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-rw-r--r--fs/ubifs/file.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 4071d1cae29f..3d698e2022b1 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -793,7 +793,7 @@ static int do_truncation(struct ubifs_info *c, struct inode *inode,
int err;
struct ubifs_budget_req req;
loff_t old_size = inode->i_size, new_size = attr->ia_size;
- int offset = new_size & (UBIFS_BLOCK_SIZE - 1);
+ int offset = new_size & (UBIFS_BLOCK_SIZE - 1), budgeted = 1;
struct ubifs_inode *ui = ubifs_inode(inode);
dbg_gen("ino %lu, size %lld -> %lld", inode->i_ino, old_size, new_size);
@@ -811,8 +811,15 @@ static int do_truncation(struct ubifs_info *c, struct inode *inode,
/* A funny way to budget for truncation node */
req.dirtied_ino_d = UBIFS_TRUN_NODE_SZ;
err = ubifs_budget_space(c, &req);
- if (err)
- return err;
+ if (err) {
+ /*
+ * Treat truncations to zero as deletion and always allow them,
+ * just like we do for '->unlink()'.
+ */
+ if (new_size || err != -ENOSPC)
+ return err;
+ budgeted = 0;
+ }
err = vmtruncate(inode, new_size);
if (err)
@@ -869,7 +876,12 @@ static int do_truncation(struct ubifs_info *c, struct inode *inode,
err = ubifs_jnl_truncate(c, inode, old_size, new_size);
mutex_unlock(&ui->ui_mutex);
out_budg:
- ubifs_release_budget(c, &req);
+ if (budgeted)
+ ubifs_release_budget(c, &req);
+ else {
+ c->nospace = c->nospace_rp = 0;
+ smp_wmb();
+ }
return err;
}