From: "Yan, Zheng" <[email protected]> make __ceph_do_pending_vmtruncate() acquire i_mutex if the caller does not hold the mutex, so ceph_aio_read() can call it safely.
Signed-off-by: Yan, Zheng <[email protected]> --- fs/ceph/file.c | 6 +++--- fs/ceph/inode.c | 18 +++++++++--------- fs/ceph/super.h | 2 +- 3 files changed, 13 insertions(+), 13 deletions(-) diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 28ef273..b9eedd4 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -653,7 +653,7 @@ static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov, dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", inode, ceph_vinop(inode), pos, (unsigned)len, inode); again: - __ceph_do_pending_vmtruncate(inode); + __ceph_do_pending_vmtruncate(inode, true); if (fi->fmode & CEPH_FILE_MODE_LAZY) want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; else @@ -730,7 +730,7 @@ retry_snap: ret = -ENOSPC; goto out; } - __ceph_do_pending_vmtruncate(inode); + __ceph_do_pending_vmtruncate(inode, true); dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n", inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, inode->i_size); @@ -801,7 +801,7 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) int ret; mutex_lock(&inode->i_mutex); - __ceph_do_pending_vmtruncate(inode); + __ceph_do_pending_vmtruncate(inode, false); if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index 42c5769..2b3fee7 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -1416,7 +1416,7 @@ out: /* - * called by trunc_wq; take i_mutex ourselves + * called by trunc_wq; * * We also truncate in a separate thread as well. */ @@ -1427,9 +1427,7 @@ static void ceph_vmtruncate_work(struct work_struct *work) struct inode *inode = &ci->vfs_inode; dout("vmtruncate_work %p\n", inode); - mutex_lock(&inode->i_mutex); - __ceph_do_pending_vmtruncate(inode); - mutex_unlock(&inode->i_mutex); + __ceph_do_pending_vmtruncate(inode, true); iput(inode); } @@ -1453,12 +1451,10 @@ void ceph_queue_vmtruncate(struct inode *inode) } /* - * called with i_mutex held. - * * Make sure any pending truncation is applied before doing anything * that may depend on it. */ -void __ceph_do_pending_vmtruncate(struct inode *inode) +void __ceph_do_pending_vmtruncate(struct inode *inode, bool needlock) { struct ceph_inode_info *ci = ceph_inode(inode); u64 to; @@ -1491,7 +1487,11 @@ retry: ci->i_truncate_pending, to); spin_unlock(&ci->i_ceph_lock); + if (needlock) + mutex_lock(&inode->i_mutex); truncate_inode_pages(inode->i_mapping, to); + if (needlock) + mutex_unlock(&inode->i_mutex); spin_lock(&ci->i_ceph_lock); if (to == ci->i_truncate_size) { @@ -1544,7 +1544,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr) if (ceph_snap(inode) != CEPH_NOSNAP) return -EROFS; - __ceph_do_pending_vmtruncate(inode); + __ceph_do_pending_vmtruncate(inode, false); err = inode_change_ok(inode, attr); if (err != 0) @@ -1722,7 +1722,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr) ceph_cap_string(dirtied), mask); ceph_mdsc_put_request(req); - __ceph_do_pending_vmtruncate(inode); + __ceph_do_pending_vmtruncate(inode, false); return err; out: spin_unlock(&ci->i_ceph_lock); diff --git a/fs/ceph/super.h b/fs/ceph/super.h index efbcb56..e5f1875 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -694,7 +694,7 @@ extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, extern int ceph_inode_holds_cap(struct inode *inode, int mask); extern int ceph_inode_set_size(struct inode *inode, loff_t size); -extern void __ceph_do_pending_vmtruncate(struct inode *inode); +extern void __ceph_do_pending_vmtruncate(struct inode *inode, bool needlock); extern void ceph_queue_vmtruncate(struct inode *inode); extern void ceph_queue_invalidate(struct inode *inode); -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
