lockd: push lock_flocks down
lockd should use lock_flocks() instead of lock_kernel() to lock against posix locks accessing the i_flock list. This is a prerequisite to turning lock_flocks into a spinlock. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: J. Bruce Fields <bfields@redhat.com>
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@ -22,7 +22,6 @@
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#include <linux/in.h>
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#include <linux/uio.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/mutex.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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@ -130,15 +129,6 @@ lockd(void *vrqstp)
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dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
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/*
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* FIXME: it would be nice if lockd didn't spend its entire life
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* running under the BKL. At the very least, it would be good to
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* have someone clarify what it's intended to protect here. I've
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* seen some handwavy posts about posix locking needing to be
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* done under the BKL, but it's far from clear.
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*/
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lock_kernel();
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if (!nlm_timeout)
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nlm_timeout = LOCKD_DFLT_TIMEO;
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nlmsvc_timeout = nlm_timeout * HZ;
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@ -195,7 +185,6 @@ lockd(void *vrqstp)
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if (nlmsvc_ops)
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nlmsvc_invalidate_all();
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nlm_shutdown_hosts();
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unlock_kernel();
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return 0;
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}
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@ -170,6 +170,7 @@ nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
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again:
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file->f_locks = 0;
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lock_flocks(); /* protects i_flock list */
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for (fl = inode->i_flock; fl; fl = fl->fl_next) {
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if (fl->fl_lmops != &nlmsvc_lock_operations)
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continue;
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@ -181,6 +182,7 @@ again:
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if (match(lockhost, host)) {
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struct file_lock lock = *fl;
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unlock_flocks();
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lock.fl_type = F_UNLCK;
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lock.fl_start = 0;
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lock.fl_end = OFFSET_MAX;
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@ -192,6 +194,7 @@ again:
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goto again;
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}
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}
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unlock_flocks();
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return 0;
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}
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@ -226,10 +229,14 @@ nlm_file_inuse(struct nlm_file *file)
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if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
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return 1;
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lock_flocks();
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for (fl = inode->i_flock; fl; fl = fl->fl_next) {
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if (fl->fl_lmops == &nlmsvc_lock_operations)
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if (fl->fl_lmops == &nlmsvc_lock_operations) {
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unlock_flocks();
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return 1;
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}
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}
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unlock_flocks();
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file->f_locks = 0;
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return 0;
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}
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@ -1,7 +1,6 @@
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config NFS_FS
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tristate "NFS client support"
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depends on INET && FILE_LOCKING
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depends on BKL # fix as soon as lockd is done
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select LOCKD
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select SUNRPC
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select NFS_ACL_SUPPORT if NFS_V3_ACL
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@ -2,7 +2,6 @@ config NFSD
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tristate "NFS server support"
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depends on INET
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depends on FILE_LOCKING
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depends on BKL # fix as soon as lockd is done
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select LOCKD
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select SUNRPC
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select EXPORTFS
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