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| author | Weston Andros Adamson <dros@netapp.com> | 2011-04-13 10:53:51 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-04-13 13:15:51 -0400 |
| commit | 79a48a1f5d99ab66cf83d2d5d805e7a0e08452ed (patch) | |
| tree | 158e953b809b93d93334cc91662136af27b69a8d /fs/nfs | |
| parent | c0d0e96b840dcc73f9b9d45bf8f405dbce72a079 (diff) | |
| download | blackbird-op-linux-79a48a1f5d99ab66cf83d2d5d805e7a0e08452ed.tar.gz blackbird-op-linux-79a48a1f5d99ab66cf83d2d5d805e7a0e08452ed.zip | |
Don't mark_inode_dirty_sync() while holding lock
mark_inode_dirty_sync() grabs the same inode lock!
race conditions between holding the lock in pnfs_set_layoutcommit() and in
mark_inode_dirty_sync() can result in a second call to pnfs_layoutcommit_inode(), but
this will be a noop as NFS_INO_LAYOUTCOMMIT won't be set in the second call
Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/pnfs.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index d9ab97269ce6..ff681ab65d31 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -1004,6 +1004,7 @@ pnfs_set_layoutcommit(struct nfs_write_data *wdata) { struct nfs_inode *nfsi = NFS_I(wdata->inode); loff_t end_pos = wdata->args.offset + wdata->res.count; + bool mark_as_dirty = false; spin_lock(&nfsi->vfs_inode.i_lock); if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { @@ -1011,13 +1012,18 @@ pnfs_set_layoutcommit(struct nfs_write_data *wdata) get_lseg(wdata->lseg); wdata->lseg->pls_lc_cred = get_rpccred(wdata->args.context->state->owner->so_cred); - mark_inode_dirty_sync(wdata->inode); + mark_as_dirty = true; dprintk("%s: Set layoutcommit for inode %lu ", __func__, wdata->inode->i_ino); } if (end_pos > wdata->lseg->pls_end_pos) wdata->lseg->pls_end_pos = end_pos; spin_unlock(&nfsi->vfs_inode.i_lock); + + /* if pnfs_layoutcommit_inode() runs between inode locks, the next one + * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ + if (mark_as_dirty) + mark_inode_dirty_sync(wdata->inode); } EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); |
