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| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-03-28 08:36:34 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-03-28 08:36:34 -0400 |
| commit | 7c9d845f0612e5bcd23456a2ec43be8ac43458f1 (patch) | |
| tree | 6e4ae22ac7fa2cdee6477c86f1d4b3caa6ef7733 /fs/nfs/pnfs.c | |
| parent | d02d81efc7564b4d5446a02e0214a164cf00b1f3 (diff) | |
| download | linux-7c9d845f0612e5bcd23456a2ec43be8ac43458f1.tar.bz2 | |
NFSv4/pNFS: Fix another issue with a list iterator pointing to the head
In nfs4_callback_devicenotify(), if we don't find a matching entry for
the deviceid, we're left with a pointer to 'struct nfs_server' that
actually points to the list of super blocks associated with our struct
nfs_client.
Furthermore, even if we have a valid pointer, nothing pins the super
block, and so the struct nfs_server could end up getting freed while
we're using it.
Since all we want is a pointer to the struct pnfs_layoutdriver_type,
let's skip all the iteration over super blocks, and just use APIs to
find the layout driver directly.
Reported-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Fixes: 1be5683b03a7 ("pnfs: CB_NOTIFY_DEVICEID")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/pnfs.c')
| -rw-r--r-- | fs/nfs/pnfs.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index de318bb5d349..856c962273c7 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -92,6 +92,17 @@ find_pnfs_driver(u32 id) return local; } +const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id) +{ + return find_pnfs_driver(id); +} + +void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld) +{ + if (ld) + module_put(ld->owner); +} + void unset_pnfs_layoutdriver(struct nfs_server *nfss) { |