quota: add the option to not fail with EDQUOT in block

To simplify metadata tracking for delalloc writes, ext4
will simply claim metadata blocks at allocation time, without
first speculatively reserving the worst case and then freeing
what was not used.

To do this, we need a mechanism to track allocations in
the quota subsystem, but potentially allow that allocation
to actually go over quota.

This patch adds a DQUOT_SPACE_NOFAIL flag and function
variants for this purpose.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 8c40c07797ad..df6832ec17c3 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1494,6 +1494,7 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
         char warntype[MAXQUOTAS];
         int warn = flags & DQUOT_SPACE_WARN;
         int reserve = flags & DQUOT_SPACE_RESERVE;
+        int nofail = flags & DQUOT_SPACE_NOFAIL;
 
         /*
          * First test before acquiring mutex - solves deadlocks when we
@@ -1514,7 +1515,7 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
                         continue;
                 ret = check_bdq(inode->i_dquot[cnt], number, !warn,
                                 warntype+cnt);
-                if (ret) {
+                if (ret && !nofail) {
                         spin_unlock(&dq_data_lock);
                         goto out_flush_warn;
                 }