diff options
| author | Bobi Jam <bobijam.xu@intel.com> | 2014-04-27 13:06:45 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-27 10:24:53 -0700 |
| commit | 178ba1e0d00aca671f9a8f5f41d28fc0fe717752 (patch) | |
| tree | 21a8d6f534062c7534a4deeb19064b3ca79d58ba /drivers | |
| parent | 8d97deb97dde884eb08d0c3b69ccfcc5a43b1350 (diff) | |
staging/lustre/llite: deadlock taking lli_trunc_sem during file write
File write before io loop will take lli_trun_sem read semaphore to
protect osc_extent, while after generic_file_aio_write() done, it
could possible need to kill suid or sgid, which will call
ll_setattr_raw() to change the inode's attribute, and it does not
involve size.
So the ll_truc_sem write semaphore should be constrained
around ll_setattr_ost() to not come across the lli_trunc_sem read
semaphore get from the normal file write path.
Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Reviewed-on: http://review.whamcloud.com/9267
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4627
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/llite_lib.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c index 7c4fd97a7fa0..373a24f5d5d7 100644 --- a/drivers/staging/lustre/lustre/llite/llite_lib.c +++ b/drivers/staging/lustre/lustre/llite/llite_lib.c @@ -1449,7 +1449,6 @@ int ll_setattr_raw(struct dentry *dentry, struct iattr *attr, bool hsm_import) if (attr->ia_valid & ATTR_SIZE) inode_dio_write_done(inode); mutex_unlock(&inode->i_mutex); - down_write(&lli->lli_trunc_sem); } memcpy(&op_data->op_attr, attr, sizeof(*attr)); @@ -1513,7 +1512,11 @@ int ll_setattr_raw(struct dentry *dentry, struct iattr *attr, bool hsm_import) * excessive to send mtime/atime updates to OSTs when not * setting times to past, but it is necessary due to possible * time de-synchronization between MDT inode and OST objects */ + if (attr->ia_valid & ATTR_SIZE) + down_write(&lli->lli_trunc_sem); rc = ll_setattr_ost(inode, attr); + if (attr->ia_valid & ATTR_SIZE) + up_write(&lli->lli_trunc_sem); out: if (op_data) { if (op_data->op_ioepoch) { @@ -1524,7 +1527,6 @@ out: ll_finish_md_op_data(op_data); } if (!S_ISDIR(inode->i_mode)) { - up_write(&lli->lli_trunc_sem); mutex_lock(&inode->i_mutex); if ((attr->ia_valid & ATTR_SIZE) && !hsm_import) inode_dio_wait(inode); |