fs: track fl_owner for leases

Just like for other lock types we should allow different owners to have
a read lease on a file.  Currently this can't happen, but with the addition
of pNFS layout leases we'll need this feature.

Signed-off-by: Christoph Hellwig <hch@lst.de>

2 files changed, 8 insertions, 6 deletions

diff --git a/fs/locks.c b/fs/locks.c
index 4d0d41163a50..22ac7694cc84 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1661,7 +1661,8 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
          */
         error = -EAGAIN;
         list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
-                if (fl->fl_file == filp) {
+                if (fl->fl_file == filp &&
+                    fl->fl_owner == lease->fl_owner) {
                         my_fl = fl;
                         continue;
                 }
@@ -1721,7 +1722,7 @@ out:
         return error;
 }
 
-static int generic_delete_lease(struct file *filp)
+static int generic_delete_lease(struct file *filp, void *owner)
 {
         int error = -EAGAIN;
         struct file_lock *fl, *victim = NULL;
@@ -1737,7 +1738,8 @@ static int generic_delete_lease(struct file *filp)
 
         spin_lock(&ctx->flc_lock);
         list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
-                if (fl->fl_file == filp) {
+                if (fl->fl_file == filp &&
+                    fl->fl_owner == owner) {
                         victim = fl;
                         break;
                 }
@@ -1778,7 +1780,7 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp,
 
         switch (arg) {
         case F_UNLCK:
-                return generic_delete_lease(filp);
+                return generic_delete_lease(filp, *priv);
         case F_RDLCK:
         case F_WRLCK:
                 if (!(*flp)->fl_lmops->lm_break) {
@@ -1857,7 +1859,7 @@ static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)
 int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
 {
         if (arg == F_UNLCK)
-                return vfs_setlease(filp, F_UNLCK, NULL, NULL);
+                return vfs_setlease(filp, F_UNLCK, NULL, (void **)&filp);
         return do_fcntl_add_lease(fd, filp, arg);
 }
 
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 370a53a5da13..e6b354a0d89e 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -683,7 +683,7 @@ static void nfs4_put_deleg_lease(struct nfs4_file *fp)
         spin_unlock(&fp->fi_lock);
 
         if (filp) {
-                vfs_setlease(filp, F_UNLCK, NULL, NULL);
+                vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp);
                 fput(filp);
         }
 }