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nfs: mark nfs_page reqs with flag for extra ref

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Change the use of PG_INODE_REF - set it when taking extra reference on
subrequests and take care to only release once for each request.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Weston Andros Adamson 2014-07-11 10:20:45 -04:00 committed by Trond Myklebust
parent 74adf83f5d
commit 17089a29a2
2 changed files with 9 additions and 3 deletions
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4
fs/nfs/pagelist.c
View file

@ -251,8 +251,10 @@ nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev)
/* grab extra ref if head request has extra ref from
* the write/commit path to handle handoff between write
* and commit lists */
if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags))
if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) {
set_bit(PG_INODE_REF, &req->wb_flags);
kref_get(&req->wb_kref);
}
}
}

8
fs/nfs/write.c
View file

@ -448,7 +448,9 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
set_page_private(req->wb_page, (unsigned long)req);
}
nfsi->npages++;
set_bit(PG_INODE_REF, &req->wb_flags);
/* this a head request for a page group - mark it as having an
* extra reference so sub groups can follow suit */
WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
kref_get(&req->wb_kref);
spin_unlock(&inode->i_lock);
}
@ -474,7 +476,9 @@ static void nfs_inode_remove_request(struct nfs_page *req)
nfsi->npages--;
spin_unlock(&inode->i_lock);
}
nfs_release_request(req);
if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags))
nfs_release_request(req);
}
static void