diff options
| -rw-r--r-- | fs/Kconfig | 1 | ||||
| -rw-r--r-- | fs/fcntl.c | 66 | ||||
| -rw-r--r-- | fs/lockd/svc.c | 11 | ||||
| -rw-r--r-- | fs/lockd/svclock.c | 6 | ||||
| -rw-r--r-- | fs/lockd/svcsubs.c | 9 | ||||
| -rw-r--r-- | fs/locks.c | 57 | ||||
| -rw-r--r-- | fs/nfs/Kconfig | 1 | ||||
| -rw-r--r-- | fs/nfsd/Kconfig | 1 | ||||
| -rw-r--r-- | fs/nfsd/nfs4state.c | 26 | ||||
| -rw-r--r-- | include/linux/fs.h | 6 |
10 files changed, 114 insertions, 70 deletions
@@ -53,7 +53,6 @@ config EXPORTFS config FILE_LOCKING bool "Enable POSIX file locking API" if EMBEDDED default y - select BKL # while lockd still uses it. help This option enables standard file locking support, required for filesystems like NFS and for the flock() system @@ -640,7 +640,7 @@ static void fasync_free_rcu(struct rcu_head *head) * match the state "is the filp on a fasync list". * */ -static int fasync_remove_entry(struct file *filp, struct fasync_struct **fapp) +int fasync_remove_entry(struct file *filp, struct fasync_struct **fapp) { struct fasync_struct *fa, **fp; int result = 0; @@ -666,21 +666,28 @@ static int fasync_remove_entry(struct file *filp, struct fasync_struct **fapp) return result; } +struct fasync_struct *fasync_alloc(void) +{ + return kmem_cache_alloc(fasync_cache, GFP_KERNEL); +} + /* - * Add a fasync entry. Return negative on error, positive if - * added, and zero if did nothing but change an existing one. - * - * NOTE! It is very important that the FASYNC flag always - * match the state "is the filp on a fasync list". + * NOTE! This can be used only for unused fasync entries: + * entries that actually got inserted on the fasync list + * need to be released by rcu - see fasync_remove_entry. */ -static int fasync_add_entry(int fd, struct file *filp, struct fasync_struct **fapp) +void fasync_free(struct fasync_struct *new) { - struct fasync_struct *new, *fa, **fp; - int result = 0; + kmem_cache_free(fasync_cache, new); +} - new = kmem_cache_alloc(fasync_cache, GFP_KERNEL); - if (!new) - return -ENOMEM; +/* + * Insert a new entry into the fasync list. Return the pointer to the + * old one if we didn't use the new one. + */ +struct fasync_struct *fasync_insert_entry(int fd, struct file *filp, struct fasync_struct **fapp, struct fasync_struct *new) +{ + struct fasync_struct *fa, **fp; spin_lock(&filp->f_lock); spin_lock(&fasync_lock); @@ -691,8 +698,6 @@ static int fasync_add_entry(int fd, struct file *filp, struct fasync_struct **fa spin_lock_irq(&fa->fa_lock); fa->fa_fd = fd; spin_unlock_irq(&fa->fa_lock); - - kmem_cache_free(fasync_cache, new); goto out; } @@ -702,13 +707,42 @@ static int fasync_add_entry(int fd, struct file *filp, struct fasync_struct **fa new->fa_fd = fd; new->fa_next = *fapp; rcu_assign_pointer(*fapp, new); - result = 1; filp->f_flags |= FASYNC; out: spin_unlock(&fasync_lock); spin_unlock(&filp->f_lock); - return result; + return fa; +} + +/* + * Add a fasync entry. Return negative on error, positive if + * added, and zero if did nothing but change an existing one. + * + * NOTE! It is very important that the FASYNC flag always + * match the state "is the filp on a fasync list". + */ +static int fasync_add_entry(int fd, struct file *filp, struct fasync_struct **fapp) +{ + struct fasync_struct *new; + + new = fasync_alloc(); + if (!new) + return -ENOMEM; + + /* + * fasync_insert_entry() returns the old (update) entry if + * it existed. + * + * So free the (unused) new entry and return 0 to let the + * caller know that we didn't add any new fasync entries. + */ + if (fasync_insert_entry(fd, filp, fapp, new)) { + fasync_free(new); + return 0; + } + + return 1; } /* diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c index b13aabc..abfff9d 100644 --- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -22,7 +22,6 @@ #include <linux/in.h> #include <linux/uio.h> #include <linux/smp.h> -#include <linux/smp_lock.h> #include <linux/mutex.h> #include <linux/kthread.h> #include <linux/freezer.h> @@ -130,15 +129,6 @@ lockd(void *vrqstp) dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n"); - /* - * FIXME: it would be nice if lockd didn't spend its entire life - * running under the BKL. At the very least, it would be good to - * have someone clarify what it's intended to protect here. I've - * seen some handwavy posts about posix locking needing to be - * done under the BKL, but it's far from clear. - */ - lock_kernel(); - if (!nlm_timeout) nlm_timeout = LOCKD_DFLT_TIMEO; nlmsvc_timeout = nlm_timeout * HZ; @@ -195,7 +185,6 @@ lockd(void *vrqstp) if (nlmsvc_ops) nlmsvc_invalidate_all(); nlm_shutdown_hosts(); - unlock_kernel(); return 0; } diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c index 6f1ef00..c462d34 100644 --- a/fs/lockd/svclock.c +++ b/fs/lockd/svclock.c @@ -700,14 +700,16 @@ nlmsvc_notify_blocked(struct file_lock *fl) struct nlm_block *block; dprintk("lockd: VFS unblock notification for block %p\n", fl); + spin_lock(&nlm_blocked_lock); list_for_each_entry(block, &nlm_blocked, b_list) { if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) { - nlmsvc_insert_block(block, 0); + nlmsvc_insert_block_locked(block, 0); + spin_unlock(&nlm_blocked_lock); svc_wake_up(block->b_daemon); return; } } - + spin_unlock(&nlm_blocked_lock); printk(KERN_WARNING "lockd: notification for unknown block!\n"); } diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c index d0ef94c..1ca0679 100644 --- a/fs/lockd/svcsubs.c +++ b/fs/lockd/svcsubs.c @@ -170,6 +170,7 @@ nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file, again: file->f_locks = 0; + lock_flocks(); /* protects i_flock list */ for (fl = inode->i_flock; fl; fl = fl->fl_next) { if (fl->fl_lmops != &nlmsvc_lock_operations) continue; @@ -181,6 +182,7 @@ again: if (match(lockhost, host)) { struct file_lock lock = *fl; + unlock_flocks(); lock.fl_type = F_UNLCK; lock.fl_start = 0; lock.fl_end = OFFSET_MAX; @@ -192,6 +194,7 @@ again: goto again; } } + unlock_flocks(); return 0; } @@ -226,10 +229,14 @@ nlm_file_inuse(struct nlm_file *file) if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares) return 1; + lock_flocks(); for (fl = inode->i_flock; fl; fl = fl->fl_next) { - if (fl->fl_lmops == &nlmsvc_lock_operations) + if (fl->fl_lmops == &nlmsvc_lock_operations) { + unlock_flocks(); return 1; + } } + unlock_flocks(); file->f_locks = 0; return 0; } @@ -142,6 +142,7 @@ int lease_break_time = 45; static LIST_HEAD(file_lock_list); static LIST_HEAD(blocked_list); +static DEFINE_SPINLOCK(file_lock_lock); /* * Protects the two list heads above, plus the inode->i_flock list @@ -149,23 +150,24 @@ static LIST_HEAD(blocked_list); */ void lock_flocks(void) { - lock_kernel(); + spin_lock(&file_lock_lock); } EXPORT_SYMBOL_GPL(lock_flocks); void unlock_flocks(void) { - unlock_kernel(); + spin_unlock(&file_lock_lock); } EXPORT_SYMBOL_GPL(unlock_flocks); static struct kmem_cache *filelock_cache __read_mostly; /* Allocate an empty lock structure. */ -static struct file_lock *locks_alloc_lock(void) +struct file_lock *locks_alloc_lock(void) { return kmem_cache_alloc(filelock_cache, GFP_KERNEL); } +EXPORT_SYMBOL_GPL(locks_alloc_lock); void locks_release_private(struct file_lock *fl) { @@ -1365,7 +1367,6 @@ int fcntl_getlease(struct file *filp) int generic_setlease(struct file *filp, long arg, struct file_lock **flp) { struct file_lock *fl, **before, **my_before = NULL, *lease; - struct file_lock *new_fl = NULL; struct dentry *dentry = filp->f_path.dentry; struct inode *inode = dentry->d_inode; int error, rdlease_count = 0, wrlease_count = 0; @@ -1385,11 +1386,6 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp) lease = *flp; if (arg != F_UNLCK) { - error = -ENOMEM; - new_fl = locks_alloc_lock(); - if (new_fl == NULL) - goto out; - error = -EAGAIN; if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0)) goto out; @@ -1434,7 +1430,6 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp) goto out; } - error = 0; if (arg == F_UNLCK) goto out; @@ -1442,15 +1437,11 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp) if (!leases_enable) goto out; - locks_copy_lock(new_fl, lease); - locks_insert_lock(before, new_fl); - - *flp = new_fl; + locks_insert_lock(before, lease); return 0; out: - if (new_fl != NULL) - locks_free_lock(new_fl); + locks_free_lock(lease); return error; } EXPORT_SYMBOL(generic_setlease); @@ -1514,26 +1505,38 @@ EXPORT_SYMBOL_GPL(vfs_setlease); */ int fcntl_setlease(unsigned int fd, struct file *filp, long arg) { - struct file_lock fl, *flp = &fl; + struct file_lock *fl; + struct fasync_struct *new; struct inode *inode = filp->f_path.dentry->d_inode; int error; - locks_init_lock(&fl); - error = lease_init(filp, arg, &fl); - if (error) - return error; + fl = lease_alloc(filp, arg); + if (IS_ERR(fl)) + return PTR_ERR(fl); + new = fasync_alloc(); + if (!new) { + locks_free_lock(fl); + return -ENOMEM; + } lock_flocks(); - - error = __vfs_setlease(filp, arg, &flp); + error = __vfs_setlease(filp, arg, &fl); if (error || arg == F_UNLCK) goto out_unlock; - error = fasync_helper(fd, filp, 1, &flp->fl_fasync); + /* + * fasync_insert_entry() returns the old entry if any. + * If there was no old entry, then it used 'new' and + * inserted it into the fasync list. Clear new so that + * we don't release it here. + */ + if (!fasync_insert_entry(fd, filp, &fl->fl_fasync, new)) + new = NULL; + if (error < 0) { /* remove lease just inserted by setlease */ - flp->fl_type = F_UNLCK | F_INPROGRESS; - flp->fl_break_time = jiffies - 10; + fl->fl_type = F_UNLCK | F_INPROGRESS; + fl->fl_break_time = jiffies - 10; time_out_leases(inode); goto out_unlock; } @@ -1541,6 +1544,8 @@ int fcntl_setlease(unsigned int fd, struct file *filp, long arg) error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0); out_unlock: unlock_flocks(); + if (new) + fasync_free(new); return error; } diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig index fd66765..ba30665 100644 --- a/fs/nfs/Kconfig +++ b/fs/nfs/Kconfig @@ -1,7 +1,6 @@ config NFS_FS tristate "NFS client support" depends on INET && FILE_LOCKING - depends on BKL # fix as soon as lockd is done select LOCKD select SUNRPC select NFS_ACL_SUPPORT if NFS_V3_ACL diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig index 31a78fc..18b3e89 100644 --- a/fs/nfsd/Kconfig +++ b/fs/nfsd/Kconfig @@ -2,7 +2,6 @@ config NFSD tristate "NFS server support" depends on INET depends on FILE_LOCKING - depends on BKL # fix as soon as lockd is done select LOCKD select SUNRPC select EXPORTFS diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 9019e8e..56347e0 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -2614,7 +2614,7 @@ nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_sta struct nfs4_delegation *dp; struct nfs4_stateowner *sop = stp->st_stateowner; int cb_up = atomic_read(&sop->so_client->cl_cb_set); - struct file_lock fl, *flp = &fl; + struct file_lock *fl; int status, flag = 0; flag = NFS4_OPEN_DELEGATE_NONE; @@ -2648,20 +2648,24 @@ nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_sta flag = NFS4_OPEN_DELEGATE_NONE; goto out; } - locks_init_lock(&fl); - fl.fl_lmops = &nfsd_lease_mng_ops; - fl.fl_flags = FL_LEASE; - fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; - fl.fl_end = OFFSET_MAX; - fl.fl_owner = (fl_owner_t)dp; - fl.fl_file = find_readable_file(stp->st_file); - BUG_ON(!fl.fl_file); - fl.fl_pid = current->tgid; + status = -ENOMEM; + fl = locks_alloc_lock(); + if (!fl) + goto out; + locks_init_lock(fl); + fl->fl_lmops = &nfsd_lease_mng_ops; + fl->fl_flags = FL_LEASE; + fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; + fl->fl_end = OFFSET_MAX; + fl->fl_owner = (fl_owner_t)dp; + fl->fl_file = find_readable_file(stp->st_file); + BUG_ON(!fl->fl_file); + fl->fl_pid = current->tgid; /* vfs_setlease checks to see if delegation should be handed out. * the lock_manager callbacks fl_mylease and fl_change are used */ - if ((status = vfs_setlease(fl.fl_file, fl.fl_type, &flp))) { + if ((status = vfs_setlease(fl->fl_file, fl->fl_type, &fl))) { dprintk("NFSD: setlease failed [%d], no delegation\n", status); unhash_delegation(dp); flag = NFS4_OPEN_DELEGATE_NONE; diff --git a/include/linux/fs.h b/include/linux/fs.h index 240eb1d..b2a6009 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1122,6 +1122,7 @@ extern int fcntl_getlease(struct file *filp); /* fs/locks.c */ extern void locks_init_lock(struct file_lock *); +extern struct file_lock * locks_alloc_lock(void); extern void locks_copy_lock(struct file_lock *, struct file_lock *); extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); extern void locks_remove_posix(struct file *, fl_owner_t); @@ -1310,6 +1311,11 @@ struct fasync_struct { /* SMP safe fasync helpers: */ extern int fasync_helper(int, struct file *, int, struct fasync_struct **); +extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); +extern int fasync_remove_entry(struct file *, struct fasync_struct **); +extern struct fasync_struct *fasync_alloc(void); +extern void fasync_free(struct fasync_struct *); + /* can be called from interrupts */ extern void kill_fasync(struct fasync_struct **, int, int); |
