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More NFS client bugfixes for 4.13 

Stable fixes:
 - Fix a race where CB_NOTIFY_LOCK fails to wake a waiter
 - Invalidate file size when taking a lock to prevent corruption
 
 Other fixes:
 - Don't excessively generate tiny writes with fallocate
 - Use the raw NFS access mask in nfs4_opendata_access()
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Merge tag 'nfs-for-4.13-3' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client fixes from Anna Schumaker:
 "More NFS client bugfixes for 4.13.

  Most of these fix locking bugs that Ben and Neil noticed, but I also
  have a patch to fix one more access bug that was reported after last
  week.

  Stable fixes:
   - Fix a race where CB_NOTIFY_LOCK fails to wake a waiter
   - Invalidate file size when taking a lock to prevent corruption

  Other fixes:
   - Don't excessively generate tiny writes with fallocate
   - Use the raw NFS access mask in nfs4_opendata_access()"

* tag 'nfs-for-4.13-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  NFSv4.1: Fix a race where CB_NOTIFY_LOCK fails to wake a waiter
  NFS: Optimize fallocate by refreshing mapping when needed.
  NFS: invalidate file size when taking a lock.
  NFS: Use raw NFS access mask in nfs4_opendata_access()
This commit is contained in:
Linus Torvalds 2017-07-28 14:44:56 -07:00
parent 19993e7378 b7dbcc0e43
commit 286ba844c5
2 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/nfs/file.c
View File

@ -617,6 +617,8 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
if (result)
goto out;
}
if (iocb->ki_pos > i_size_read(inode))
nfs_revalidate_mapping(inode, file->f_mapping);
nfs_start_io_write(inode);
result = generic_write_checks(iocb, from);
@ -750,7 +752,7 @@ do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
*/
nfs_sync_mapping(filp->f_mapping);
if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
nfs_zap_mapping(inode, filp->f_mapping);
nfs_zap_caches(inode);
out:
return status;
}

14
fs/nfs/nfs4proc.c
View File

@ -2236,7 +2236,7 @@ static int nfs4_opendata_access(struct rpc_cred *cred,
int openflags)
{
struct nfs_access_entry cache;
u32 mask;
u32 mask, flags;
/* access call failed or for some reason the server doesn't
* support any access modes -- defer access call until later */
@ -2250,16 +2250,20 @@ static int nfs4_opendata_access(struct rpc_cred *cred,
*/
if (openflags & __FMODE_EXEC) {
/* ONLY check for exec rights */
mask = MAY_EXEC;
if (S_ISDIR(state->inode->i_mode))
mask = NFS4_ACCESS_LOOKUP;
else
mask = NFS4_ACCESS_EXECUTE;
} else if ((fmode & FMODE_READ) && !opendata->file_created)
mask = MAY_READ;
mask = NFS4_ACCESS_READ;
cache.cred = cred;
cache.jiffies = jiffies;
nfs_access_set_mask(&cache, opendata->o_res.access_result);
nfs_access_add_cache(state->inode, &cache);
if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
if ((mask & ~cache.mask & flags) == 0)
return 0;
return -EACCES;
@ -6492,7 +6496,7 @@ nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&q->lock, flags);
freezable_schedule_timeout_interruptible(NFS4_LOCK_MAXTIMEOUT);
freezable_schedule_timeout(NFS4_LOCK_MAXTIMEOUT);
}
finish_wait(q, &wait);