From 2e54eb96e2c801f33d95b5dade15212ac4d6c4a5 Mon Sep 17 00:00:00 2001 From: Petr Vandrovec Date: Mon, 27 Sep 2010 01:47:33 +0200 Subject: BKL: Remove BKL from ncpfs Dozen of changes in ncpfs to provide some locking other than BKL. In readdir cache unlock and mark complete first page as last operation, so it can be used for synchronization, as code intended. When updating dentry name on case insensitive filesystems do at least some basic locking... Hold i_mutex when updating inode fields. Push some ncp_conn_is_valid down to ncp_request. Connection can become invalid at any moment, and fewer error code paths to test the better. Use i_size_{read,write} to modify file size. Set inode's backing_dev_info as ncpfs has its own special bdi. In ioctl unbreak ioctls invoked on filesystem mounted 'ro' - tests are for inode writeable or owner match, but were turned to filesystem writeable and inode writeable or owner match. Also collect all permission checks in single place. Add some locking, and remove comments saying that it would be cool to add some locks to the code. Constify some pointers. Signed-off-by: Petr Vandrovec Signed-off-by: Arnd Bergmann --- include/linux/ncp_fs.h | 28 ---------------------------- include/linux/ncp_fs_sb.h | 4 +++- 2 files changed, 3 insertions(+), 29 deletions(-) (limited to 'include') diff --git a/include/linux/ncp_fs.h b/include/linux/ncp_fs.h index 4522aed00906..ef663061d5ac 100644 --- a/include/linux/ncp_fs.h +++ b/include/linux/ncp_fs.h @@ -241,34 +241,6 @@ int ncp_mmap(struct file *, struct vm_area_struct *); /* linux/fs/ncpfs/ncplib_kernel.c */ int ncp_make_closed(struct inode *); -#define ncp_namespace(i) (NCP_SERVER(i)->name_space[NCP_FINFO(i)->volNumber]) - -static inline int ncp_preserve_entry_case(struct inode *i, __u32 nscreator) -{ -#ifdef CONFIG_NCPFS_SMALLDOS - int ns = ncp_namespace(i); - - if ((ns == NW_NS_DOS) -#ifdef CONFIG_NCPFS_OS2_NS - || ((ns == NW_NS_OS2) && (nscreator == NW_NS_DOS)) -#endif /* CONFIG_NCPFS_OS2_NS */ - ) - return 0; -#endif /* CONFIG_NCPFS_SMALLDOS */ - return 1; -} - -#define ncp_preserve_case(i) (ncp_namespace(i) != NW_NS_DOS) - -static inline int ncp_case_sensitive(struct inode *i) -{ -#ifdef CONFIG_NCPFS_NFS_NS - return ncp_namespace(i) == NW_NS_NFS; -#else - return 0; -#endif /* CONFIG_NCPFS_NFS_NS */ -} - #endif /* __KERNEL__ */ #endif /* _LINUX_NCP_FS_H */ diff --git a/include/linux/ncp_fs_sb.h b/include/linux/ncp_fs_sb.h index 8da05bc098ca..d64b0e894336 100644 --- a/include/linux/ncp_fs_sb.h +++ b/include/linux/ncp_fs_sb.h @@ -62,6 +62,7 @@ struct ncp_server { int ncp_reply_size; int root_setuped; + struct mutex root_setup_lock; /* info for packet signing */ int sign_wanted; /* 1=Server needs signed packets */ @@ -81,13 +82,14 @@ struct ncp_server { size_t len; void* data; } priv; + struct rw_semaphore auth_rwsem; /* nls info: codepage for volume and charset for I/O */ struct nls_table *nls_vol; struct nls_table *nls_io; /* maximum age in jiffies */ - int dentry_ttl; + atomic_t dentry_ttl; /* miscellaneous */ unsigned int flags; -- cgit v1.2.3 From b89f432133851a01c0d28822f11cbdcc15781a75 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Sat, 18 Sep 2010 15:09:31 +0200 Subject: fs/locks.c: prepare for BKL removal This prepares the removal of the big kernel lock from the file locking code. We still use the BKL as long as fs/lockd uses it and ceph might sleep, but we can flip the definition to a private spinlock as soon as that's done. All users outside of fs/lockd get converted to use lock_flocks() instead of lock_kernel() where appropriate. Based on an earlier patch to use a spinlock from Matthew Wilcox, who has attempted this a few times before, the earliest patch from over 10 years ago turned it into a semaphore, which ended up being slower than the BKL and was subsequently reverted. Someone should do some serious performance testing when this becomes a spinlock, since this has caused problems before. Using a spinlock should be at least as good as the BKL in theory, but who knows... Signed-off-by: Arnd Bergmann Acked-by: Matthew Wilcox Cc: Christoph Hellwig Cc: Trond Myklebust Cc: "J. Bruce Fields" Cc: Andrew Morton Cc: Miklos Szeredi Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: John Kacur Cc: Sage Weil Cc: linux-kernel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org --- fs/afs/flock.c | 5 +-- fs/cifs/cifsfs.c | 4 +- fs/gfs2/file.c | 2 + fs/locks.c | 112 +++++++++++++++++++++++++++++++--------------------- fs/nfs/delegation.c | 10 ++--- fs/nfs/nfs4state.c | 10 ++--- fs/nfsd/nfs4state.c | 6 +-- include/linux/fs.h | 14 +++++-- 8 files changed, 97 insertions(+), 66 deletions(-) (limited to 'include') diff --git a/fs/afs/flock.c b/fs/afs/flock.c index 0931bc1325eb..757d664575dd 100644 --- a/fs/afs/flock.c +++ b/fs/afs/flock.c @@ -9,7 +9,6 @@ * 2 of the License, or (at your option) any later version. */ -#include #include "internal.h" #define AFS_LOCK_GRANTED 0 @@ -274,7 +273,7 @@ static int afs_do_setlk(struct file *file, struct file_lock *fl) type = (fl->fl_type == F_RDLCK) ? AFS_LOCK_READ : AFS_LOCK_WRITE; - lock_kernel(); + lock_flocks(); /* make sure we've got a callback on this file and that our view of the * data version is up to date */ @@ -421,7 +420,7 @@ given_lock: afs_vnode_fetch_status(vnode, NULL, key); error: - unlock_kernel(); + unlock_flocks(); _leave(" = %d", ret); return ret; diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 4e273f7793f6..50208c15309a 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -562,8 +562,8 @@ static loff_t cifs_llseek(struct file *file, loff_t offset, int origin) static int cifs_setlease(struct file *file, long arg, struct file_lock **lease) { - /* note that this is called by vfs setlease with the BKL held - although I doubt that BKL is needed here in cifs */ + /* note that this is called by vfs setlease with lock_flocks held + to protect *lease from going away */ struct inode *inode = file->f_path.dentry->d_inode; if (!(S_ISREG(inode->i_mode))) diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 4edd662c8232..8fcfefb96077 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -620,6 +620,8 @@ static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov, * cluster; until we do, disable leases (by just returning -EINVAL), * unless the administrator has requested purely local locking. * + * Locking: called under lock_flocks + * * Returns: errno */ diff --git a/fs/locks.c b/fs/locks.c index ab24d49fc048..8b2b6ad56a09 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -143,6 +143,22 @@ int lease_break_time = 45; static LIST_HEAD(file_lock_list); static LIST_HEAD(blocked_list); +/* + * Protects the two list heads above, plus the inode->i_flock list + * FIXME: should use a spinlock, once lockd and ceph are ready. + */ +void lock_flocks(void) +{ + lock_kernel(); +} +EXPORT_SYMBOL_GPL(lock_flocks); + +void unlock_flocks(void) +{ + unlock_kernel(); +} +EXPORT_SYMBOL_GPL(unlock_flocks); + static struct kmem_cache *filelock_cache __read_mostly; /* Allocate an empty lock structure. */ @@ -511,9 +527,9 @@ static void __locks_delete_block(struct file_lock *waiter) */ static void locks_delete_block(struct file_lock *waiter) { - lock_kernel(); + lock_flocks(); __locks_delete_block(waiter); - unlock_kernel(); + unlock_flocks(); } /* Insert waiter into blocker's block list. @@ -644,7 +660,7 @@ posix_test_lock(struct file *filp, struct file_lock *fl) { struct file_lock *cfl; - lock_kernel(); + lock_flocks(); for (cfl = filp->f_path.dentry->d_inode->i_flock; cfl; cfl = cfl->fl_next) { if (!IS_POSIX(cfl)) continue; @@ -657,7 +673,7 @@ posix_test_lock(struct file *filp, struct file_lock *fl) fl->fl_pid = pid_vnr(cfl->fl_nspid); } else fl->fl_type = F_UNLCK; - unlock_kernel(); + unlock_flocks(); return; } EXPORT_SYMBOL(posix_test_lock); @@ -730,18 +746,16 @@ static int flock_lock_file(struct file *filp, struct file_lock *request) int error = 0; int found = 0; - lock_kernel(); - if (request->fl_flags & FL_ACCESS) - goto find_conflict; - - if (request->fl_type != F_UNLCK) { - error = -ENOMEM; + if (!(request->fl_flags & FL_ACCESS) && (request->fl_type != F_UNLCK)) { new_fl = locks_alloc_lock(); - if (new_fl == NULL) - goto out; - error = 0; + if (!new_fl) + return -ENOMEM; } + lock_flocks(); + if (request->fl_flags & FL_ACCESS) + goto find_conflict; + for_each_lock(inode, before) { struct file_lock *fl = *before; if (IS_POSIX(fl)) @@ -767,8 +781,11 @@ static int flock_lock_file(struct file *filp, struct file_lock *request) * If a higher-priority process was blocked on the old file lock, * give it the opportunity to lock the file. */ - if (found) + if (found) { + unlock_flocks(); cond_resched(); + lock_flocks(); + } find_conflict: for_each_lock(inode, before) { @@ -794,7 +811,7 @@ find_conflict: error = 0; out: - unlock_kernel(); + unlock_flocks(); if (new_fl) locks_free_lock(new_fl); return error; @@ -823,7 +840,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str new_fl2 = locks_alloc_lock(); } - lock_kernel(); + lock_flocks(); if (request->fl_type != F_UNLCK) { for_each_lock(inode, before) { fl = *before; @@ -991,7 +1008,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str locks_wake_up_blocks(left); } out: - unlock_kernel(); + unlock_flocks(); /* * Free any unused locks. */ @@ -1066,14 +1083,14 @@ int locks_mandatory_locked(struct inode *inode) /* * Search the lock list for this inode for any POSIX locks. */ - lock_kernel(); + lock_flocks(); for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { if (!IS_POSIX(fl)) continue; if (fl->fl_owner != owner) break; } - unlock_kernel(); + unlock_flocks(); return fl ? -EAGAIN : 0; } @@ -1186,7 +1203,7 @@ int __break_lease(struct inode *inode, unsigned int mode) new_fl = lease_alloc(NULL, want_write ? F_WRLCK : F_RDLCK); - lock_kernel(); + lock_flocks(); time_out_leases(inode); @@ -1247,8 +1264,10 @@ restart: break_time++; } locks_insert_block(flock, new_fl); + unlock_flocks(); error = wait_event_interruptible_timeout(new_fl->fl_wait, !new_fl->fl_next, break_time); + lock_flocks(); __locks_delete_block(new_fl); if (error >= 0) { if (error == 0) @@ -1263,7 +1282,7 @@ restart: } out: - unlock_kernel(); + unlock_flocks(); if (!IS_ERR(new_fl)) locks_free_lock(new_fl); return error; @@ -1319,7 +1338,7 @@ int fcntl_getlease(struct file *filp) struct file_lock *fl; int type = F_UNLCK; - lock_kernel(); + lock_flocks(); time_out_leases(filp->f_path.dentry->d_inode); for (fl = filp->f_path.dentry->d_inode->i_flock; fl && IS_LEASE(fl); fl = fl->fl_next) { @@ -1328,7 +1347,7 @@ int fcntl_getlease(struct file *filp) break; } } - unlock_kernel(); + unlock_flocks(); return type; } @@ -1341,7 +1360,7 @@ int fcntl_getlease(struct file *filp) * The (input) flp->fl_lmops->fl_break function is required * by break_lease(). * - * Called with kernel lock held. + * Called with file_lock_lock held. */ int generic_setlease(struct file *filp, long arg, struct file_lock **flp) { @@ -1436,7 +1455,15 @@ out: } EXPORT_SYMBOL(generic_setlease); - /** +static int __vfs_setlease(struct file *filp, long arg, struct file_lock **lease) +{ + if (filp->f_op && filp->f_op->setlease) + return filp->f_op->setlease(filp, arg, lease); + else + return generic_setlease(filp, arg, lease); +} + +/** * vfs_setlease - sets a lease on an open file * @filp: file pointer * @arg: type of lease to obtain @@ -1467,12 +1494,9 @@ int vfs_setlease(struct file *filp, long arg, struct file_lock **lease) { int error; - lock_kernel(); - if (filp->f_op && filp->f_op->setlease) - error = filp->f_op->setlease(filp, arg, lease); - else - error = generic_setlease(filp, arg, lease); - unlock_kernel(); + lock_flocks(); + error = __vfs_setlease(filp, arg, lease); + unlock_flocks(); return error; } @@ -1499,9 +1523,9 @@ int fcntl_setlease(unsigned int fd, struct file *filp, long arg) if (error) return error; - lock_kernel(); + lock_flocks(); - error = vfs_setlease(filp, arg, &flp); + error = __vfs_setlease(filp, arg, &flp); if (error || arg == F_UNLCK) goto out_unlock; @@ -1516,7 +1540,7 @@ int fcntl_setlease(unsigned int fd, struct file *filp, long arg) error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0); out_unlock: - unlock_kernel(); + unlock_flocks(); return error; } @@ -2020,7 +2044,7 @@ void locks_remove_flock(struct file *filp) fl.fl_ops->fl_release_private(&fl); } - lock_kernel(); + lock_flocks(); before = &inode->i_flock; while ((fl = *before) != NULL) { @@ -2038,7 +2062,7 @@ void locks_remove_flock(struct file *filp) } before = &fl->fl_next; } - unlock_kernel(); + unlock_flocks(); } /** @@ -2053,12 +2077,12 @@ posix_unblock_lock(struct file *filp, struct file_lock *waiter) { int status = 0; - lock_kernel(); + lock_flocks(); if (waiter->fl_next) __locks_delete_block(waiter); else status = -ENOENT; - unlock_kernel(); + unlock_flocks(); return status; } @@ -2172,7 +2196,7 @@ static int locks_show(struct seq_file *f, void *v) static void *locks_start(struct seq_file *f, loff_t *pos) { - lock_kernel(); + lock_flocks(); f->private = (void *)1; return seq_list_start(&file_lock_list, *pos); } @@ -2184,7 +2208,7 @@ static void *locks_next(struct seq_file *f, void *v, loff_t *pos) static void locks_stop(struct seq_file *f, void *v) { - unlock_kernel(); + unlock_flocks(); } static const struct seq_operations locks_seq_operations = { @@ -2231,7 +2255,7 @@ int lock_may_read(struct inode *inode, loff_t start, unsigned long len) { struct file_lock *fl; int result = 1; - lock_kernel(); + lock_flocks(); for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { if (IS_POSIX(fl)) { if (fl->fl_type == F_RDLCK) @@ -2248,7 +2272,7 @@ int lock_may_read(struct inode *inode, loff_t start, unsigned long len) result = 0; break; } - unlock_kernel(); + unlock_flocks(); return result; } @@ -2271,7 +2295,7 @@ int lock_may_write(struct inode *inode, loff_t start, unsigned long len) { struct file_lock *fl; int result = 1; - lock_kernel(); + lock_flocks(); for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { if (IS_POSIX(fl)) { if ((fl->fl_end < start) || (fl->fl_start > (start + len))) @@ -2286,7 +2310,7 @@ int lock_may_write(struct inode *inode, loff_t start, unsigned long len) result = 0; break; } - unlock_kernel(); + unlock_flocks(); return result; } diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c index b9c3c43cea1d..232a7eead33a 100644 --- a/fs/nfs/delegation.c +++ b/fs/nfs/delegation.c @@ -71,20 +71,20 @@ static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_ if (inode->i_flock == NULL) goto out; - /* Protect inode->i_flock using the BKL */ - lock_kernel(); + /* Protect inode->i_flock using the file locks lock */ + lock_flocks(); for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) continue; if (nfs_file_open_context(fl->fl_file) != ctx) continue; - unlock_kernel(); + unlock_flocks(); status = nfs4_lock_delegation_recall(state, fl); if (status < 0) goto out; - lock_kernel(); + lock_flocks(); } - unlock_kernel(); + unlock_flocks(); out: return status; } diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index 3e2f19b04c06..96524c5dca6b 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -40,7 +40,7 @@ #include #include -#include +#include #include #include #include @@ -970,13 +970,13 @@ static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_ /* Guard against delegation returns and new lock/unlock calls */ down_write(&nfsi->rwsem); /* Protect inode->i_flock using the BKL */ - lock_kernel(); + lock_flocks(); for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) continue; if (nfs_file_open_context(fl->fl_file)->state != state) continue; - unlock_kernel(); + unlock_flocks(); status = ops->recover_lock(state, fl); switch (status) { case 0: @@ -1003,9 +1003,9 @@ static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_ /* kill_proc(fl->fl_pid, SIGLOST, 1); */ status = 0; } - lock_kernel(); + lock_flocks(); } - unlock_kernel(); + unlock_flocks(); out: up_write(&nfsi->rwsem); return status; diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index cf0d2ffb3c84..a7292fcf7718 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -33,7 +33,7 @@ */ #include -#include +#include #include #include #include @@ -3895,7 +3895,7 @@ check_for_locks(struct nfs4_file *filp, struct nfs4_stateowner *lowner) struct inode *inode = filp->fi_inode; int status = 0; - lock_kernel(); + lock_flocks(); for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) { if ((*flpp)->fl_owner == (fl_owner_t)lowner) { status = 1; @@ -3903,7 +3903,7 @@ check_for_locks(struct nfs4_file *filp, struct nfs4_stateowner *lowner) } } out: - unlock_kernel(); + unlock_flocks(); return status; } diff --git a/include/linux/fs.h b/include/linux/fs.h index 63d069bd80b7..180325268237 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1093,10 +1093,6 @@ struct file_lock { #include -/* temporary stubs for BKL removal */ -#define lock_flocks() lock_kernel() -#define unlock_flocks() unlock_kernel() - extern void send_sigio(struct fown_struct *fown, int fd, int band); #ifdef CONFIG_FILE_LOCKING @@ -1135,6 +1131,8 @@ extern int vfs_setlease(struct file *, long, struct file_lock **); extern int lease_modify(struct file_lock **, int); extern int lock_may_read(struct inode *, loff_t start, unsigned long count); extern int lock_may_write(struct inode *, loff_t start, unsigned long count); +extern void lock_flocks(void); +extern void unlock_flocks(void); #else /* !CONFIG_FILE_LOCKING */ static inline int fcntl_getlk(struct file *file, struct flock __user *user) { @@ -1277,6 +1275,14 @@ static inline int lock_may_write(struct inode *inode, loff_t start, return 1; } +static inline void lock_flocks(void) +{ +} + +static inline void unlock_flocks(void) +{ +} + #endif /* !CONFIG_FILE_LOCKING */ -- cgit v1.2.3