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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>
This commit is contained in:
Christoph Hellwig 2015-01-21 19:14:02 +01:00
parent 6cae0a4648
commit 2ab99ee124
2 changed files with 8 additions and 6 deletions
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12
fs/locks.c
View File

@ -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);
}

2
fs/nfsd/nfs4state.c
View File

@ -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);
}
}