pnfs-obj: Must return layout on IO error
As mandated by the standard. In case of an IO error, a pNFS objects layout driver must return it's layout. This is because all device errors are reported to the server as part of the layout return buffer. This is implemented the same way PNFS_LAYOUTRET_ON_SETATTR is done, through a bit flag on the pnfs_layoutdriver_type->flags member. The flag is set by the layout driver that wants a layout_return preformed at pnfs_ld_{write,read}_done in case of an error. (Though I have not defined a wrapper like pnfs_ld_layoutret_on_setattr because this code is never called outside of pnfs.c and pnfs IO paths) Without this patch 3.[0-2] Kernels leak memory and have an annoying WARN_ON after every IO error utilizing the pnfs-obj driver. [This patch is for 3.2 Kernel. 3.1/0 Kernels need a different patch] CC: Stable Tree <stable@kernel.org> Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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3 changed files with 15 additions and 1 deletions
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@ -551,7 +551,8 @@ static const struct nfs_pageio_ops objio_pg_write_ops = {
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static struct pnfs_layoutdriver_type objlayout_type = {
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.id = LAYOUT_OSD2_OBJECTS,
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.name = "LAYOUT_OSD2_OBJECTS",
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.flags = PNFS_LAYOUTRET_ON_SETATTR,
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.flags = PNFS_LAYOUTRET_ON_SETATTR |
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PNFS_LAYOUTRET_ON_ERROR,
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.alloc_layout_hdr = objlayout_alloc_layout_hdr,
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.free_layout_hdr = objlayout_free_layout_hdr,
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@ -1178,6 +1178,15 @@ void pnfs_ld_write_done(struct nfs_write_data *data)
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put_lseg(data->lseg);
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data->lseg = NULL;
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dprintk("pnfs write error = %d\n", data->pnfs_error);
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if (NFS_SERVER(data->inode)->pnfs_curr_ld->flags &
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PNFS_LAYOUTRET_ON_ERROR) {
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/* Don't lo_commit on error, Server will needs to
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* preform a file recovery.
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*/
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clear_bit(NFS_INO_LAYOUTCOMMIT,
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&NFS_I(data->inode)->flags);
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pnfs_return_layout(data->inode);
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}
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}
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data->mds_ops->rpc_release(data);
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}
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@ -1267,6 +1276,9 @@ static void pnfs_ld_handle_read_error(struct nfs_read_data *data)
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put_lseg(data->lseg);
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data->lseg = NULL;
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dprintk("pnfs write error = %d\n", data->pnfs_error);
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if (NFS_SERVER(data->inode)->pnfs_curr_ld->flags &
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PNFS_LAYOUTRET_ON_ERROR)
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pnfs_return_layout(data->inode);
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nfs_pageio_init_read_mds(&pgio, data->inode);
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@ -68,6 +68,7 @@ enum {
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enum layoutdriver_policy_flags {
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/* Should the pNFS client commit and return the layout upon a setattr */
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PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
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PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
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};
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struct nfs4_deviceid_node;
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