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authorAl Viro <viro@zeniv.linux.org.uk>2018-06-28 22:53:17 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2018-08-03 22:55:30 +0300
commitc2b6d621c4ffe9936adf7a55c8b1c769672c306f (patch)
treed13dbb52a33dd594a78b8996132c7e7bba6f296f /fs/dcache.c
parentc971e6a006175bd0f195c6346c4e8bc4089bec00 (diff)
downloadlinux-c2b6d621c4ffe9936adf7a55c8b1c769672c306f.tar.xz
new primitive: discard_new_inode()
We don't want open-by-handle picking half-set-up in-core struct inode from e.g. mkdir() having failed halfway through. In other words, we don't want such inodes returned by iget_locked() on their way to extinction. However, we can't just have them unhashed - otherwise open-by-handle immediately *after* that would've ended up creating a new in-core inode over the on-disk one that is in process of being freed right under us. Solution: new flag (I_CREATING) set by insert_inode_locked() and removed by unlock_new_inode() and a new primitive (discard_new_inode()) to be used by such halfway-through-setup failure exits instead of unlock_new_inode() / iput() combinations. That primitive unlocks new inode, but leaves I_CREATING in place. iget_locked() treats finding an I_CREATING inode as failure (-ESTALE, once we sort out the error propagation). insert_inode_locked() treats the same as instant -EBUSY. ilookup() treats those as icache miss. [Fix by Dan Carpenter <dan.carpenter@oracle.com> folded in] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index a7d9e7a4c283..11b753d29409 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1892,7 +1892,7 @@ void d_instantiate_new(struct dentry *entry, struct inode *inode)
spin_lock(&inode->i_lock);
__d_instantiate(entry, inode);
WARN_ON(!(inode->i_state & I_NEW));
- inode->i_state &= ~I_NEW;
+ inode->i_state &= ~I_NEW & ~I_CREATING;
smp_mb();
wake_up_bit(&inode->i_state, __I_NEW);
spin_unlock(&inode->i_lock);