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ceph: acquire i_mutex in __ceph_do_pending_vmtruncate 

make __ceph_do_pending_vmtruncate() acquire the i_mutex if the caller
does not hold the i_mutex, so ceph_aio_read() can call safely.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Greg Farnum <greg@inktank.com>
This commit is contained in:
Yan, Zheng 2013-03-01 10:57:54 +08:00 committed by Sage Weil
parent 6070e0c1e2
commit 3f99969f42
3 changed files with 13 additions and 13 deletions
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6
fs/ceph/file.c
View File

@ -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);

18
fs/ceph/inode.c
View File

@ -1453,7 +1453,7 @@ out:
/*
* called by trunc_wq; take i_mutex ourselves
* called by trunc_wq;
*
* We also truncate in a separate thread as well.
*/
@ -1464,9 +1464,7 @@ 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);
}
@ -1490,12 +1488,10 @@ 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;
@ -1528,7 +1524,11 @@ 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) {
@ -1581,7 +1581,7 @@ 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)
@ -1763,7 +1763,7 @@ 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);

2
fs/ceph/super.h
View File

@ -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);