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pnfs: add return_range method

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If a layout driver keeps per-inode state outside of the layout segments it
needs to be notified of any layout returns or recalls on an inode, and not
just about the freeing of layout segments.  Add a method to acomplish this,
which will allow the block layout driver to handle the case of truncated
and re-expanded files properly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Christoph Hellwig 2014-09-10 08:23:31 -07:00 committed by Trond Myklebust
parent 612aa983a0
commit c88953d87f
3 changed files with 22 additions and 3 deletions
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12
fs/nfs/callback_proc.c
View File

@ -181,10 +181,16 @@ static u32 initiate_file_draining(struct nfs_client *clp,
spin_lock(&ino->i_lock);
if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
pnfs_mark_matching_lsegs_invalid(lo, &free_me_list,
&args->cbl_range))
&args->cbl_range)) {
rv = NFS4ERR_DELAY;
else
rv = NFS4ERR_NOMATCHING_LAYOUT;
goto unlock;
}
if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
&args->cbl_range);
}
unlock:
spin_unlock(&ino->i_lock);
pnfs_free_lseg_list(&free_me_list);
pnfs_put_layout_hdr(lo);

10
fs/nfs/pnfs.c
View File

@ -857,6 +857,16 @@ _pnfs_return_layout(struct inode *ino)
empty = list_empty(&lo->plh_segs);
pnfs_clear_layoutcommit(ino, &tmp_list);
pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
struct pnfs_layout_range range = {
.iomode = IOMODE_ANY,
.offset = 0,
.length = NFS4_MAX_UINT64,
};
NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
}
/* Don't send a LAYOUTRETURN if list was initially empty */
if (empty) {
spin_unlock(&ino->i_lock);

3
fs/nfs/pnfs.h
View File

@ -94,6 +94,9 @@ struct pnfs_layoutdriver_type {
struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
void (*free_lseg) (struct pnfs_layout_segment *lseg);
void (*return_range) (struct pnfs_layout_hdr *lo,
struct pnfs_layout_range *range);
/* test for nfs page cache coalescing */
const struct nfs_pageio_ops *pg_read_ops;
const struct nfs_pageio_ops *pg_write_ops;