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nfsd: use locks_inode_context helper

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[ Upstream commit 77c67530e1 ]

nfsd currently doesn't access i_flctx safely everywhere. This requires a
smp_load_acquire, as the pointer is set via cmpxchg (a release
operation).

Acked-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeff Layton
2022-11-16 09:36:07 -05:00
committed by Greg Kroah-Hartman
parent c66f9f22e6
commit e017486dad
1 changed files with 3 additions and 3 deletions
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6
fs/nfsd/nfs4state.c
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@@ -4784,7 +4784,7 @@ nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
static bool nfsd4_deleg_present(const struct inode *inode) static bool nfsd4_deleg_present(const struct inode *inode)
{ {
struct file_lock_context *ctx = smp_load_acquire(&inode->i_flctx); struct file_lock_context *ctx = locks_inode_context(inode);
return ctx && !list_empty_careful(&ctx->flc_lease); return ctx && !list_empty_careful(&ctx->flc_lease);
} }
@@ -5944,7 +5944,7 @@ nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) { list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
nf = stp->st_stid.sc_file; nf = stp->st_stid.sc_file;
ctx = nf->fi_inode->i_flctx; ctx = locks_inode_context(nf->fi_inode);
if (!ctx) if (!ctx)
continue; continue;
if (locks_owner_has_blockers(ctx, lo)) if (locks_owner_has_blockers(ctx, lo))
@@ -7761,7 +7761,7 @@ check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
} }
inode = locks_inode(nf->nf_file); inode = locks_inode(nf->nf_file);
flctx = inode->i_flctx; flctx = locks_inode_context(inode);
if (flctx && !list_empty_careful(&flctx->flc_posix)) { if (flctx && !list_empty_careful(&flctx->flc_posix)) {
spin_lock(&flctx->flc_lock); spin_lock(&flctx->flc_lock);