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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2017-04-25 16:56:19 +0200 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2017-04-25 16:56:19 +0200 |
| commit | b3230e80a6d115d2eb50fe3f4794ad04d84766de (patch) | |
| tree | c0b55ff70d1643c37656e44b87d9f18e3256b58f /fs/nfs/pnfs.c | |
| parent | NFS: Always wait for I/O completion before unlock (diff) | |
| download | linux-b3230e80a6d115d2eb50fe3f4794ad04d84766de.tar.xz linux-b3230e80a6d115d2eb50fe3f4794ad04d84766de.zip | |
pNFS: Ensure we check layout segment validity in the pg_init() callback
If we have a layout segment cached in pgio->pg_lseg, we should check it
for validity before reusing it in a new RPC request. Otherwise, if we
recoalesce, we can end up looping forever.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/pnfs.c')
| -rw-r--r-- | fs/nfs/pnfs.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 3917a6272789..634adb3f8524 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -2073,10 +2073,22 @@ void pnfs_error_mark_layout_for_return(struct inode *inode, EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); void +pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio) +{ + if (pgio->pg_lseg == NULL || + test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags)) + return; + pnfs_put_lseg(pgio->pg_lseg); + pgio->pg_lseg = NULL; +} +EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); + +void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) { u64 rd_size = req->wb_bytes; + pnfs_generic_pg_check_layout(pgio); if (pgio->pg_lseg == NULL) { if (pgio->pg_dreq == NULL) rd_size = i_size_read(pgio->pg_inode) - req_offset(req); @@ -2107,6 +2119,7 @@ void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req, u64 wb_size) { + pnfs_generic_pg_check_layout(pgio); if (pgio->pg_lseg == NULL) { pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, req->wb_context, |