litmus-rt.git - The LITMUS^RT kernel.

diff options

author	Nick Piggin <nickpiggin@yahoo.com.au>	2007-10-19 03:16:53 -0400
committer	David Woodhouse <dwmw2@infradead.org>	2007-10-22 05:24:44 -0400
commit	2a754b51aacb122cec25c849e3cf7f5503cc3ec6 (patch)
tree	679a7b65a8a031904d2098d4133de07045ee0ca6 /drivers/net/irda/litelink.c
parent	c21f900cb8817009930e672d22a5b91e5b706351 (diff)

[JFFS2] Fix return value from jffs2_write_end()

jffs2_write_end() is sometimes passing back a "written" length greater than the length we passed into it, leading to a BUG at mm/filemap.c:1749 when used with unionfs. It happens because we actually write more than was requested, to reduce log fragmentation. These "longer" writes are fine, but they shouldn't get propagated back to the vm/vfs. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: David Woodhouse <dwmw2@infradead.org>

Diffstat (limited to 'drivers/net/irda/litelink.c')

0 files changed, 0 insertions, 0 deletions

/* * The "user cache". * * (C) Copyright 1991-2000 Linus Torvalds * * We have a per-user structure to keep track of how many * processes, files etc the user has claimed, in order to be * able to have per-user limits for system resources. */ #include <linux/init.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/bitops.h> #include <linux/key.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/user_namespace.h> #include "cred-internals.h" struct user_namespace init_user_ns = { .kref = { .refcount = ATOMIC_INIT(2), }, .creator = &root_user, }; EXPORT_SYMBOL_GPL(init_user_ns); /* * UID task count cache, to get fast user lookup in "alloc_uid" * when changing user ID's (ie setuid() and friends). */ #define UIDHASH_MASK (UIDHASH_SZ - 1) #define __uidhashfn(uid) (((uid >> UIDHASH_BITS) + uid) & UIDHASH_MASK) #define uidhashentry(ns, uid) ((ns)->uidhash_table + __uidhashfn((uid))) static struct kmem_cache *uid_cachep; /* * The uidhash_lock is mostly taken from process context, but it is * occasionally also taken from softirq/tasklet context, when * task-structs get RCU-freed. Hence all locking must be softirq-safe. * But free_uid() is also called with local interrupts disabled, and running * local_bh_enable() with local interrupts disabled is an error - we'll run * softirq callbacks, and they can unconditionally enable interrupts, and * the caller of free_uid() didn't expect that.. */ static DEFINE_SPINLOCK(uidhash_lock); /* root_user.__count is 2, 1 for init task cred, 1 for init_user_ns->creator */ struct user_struct root_user = { .__count = ATOMIC_INIT(2), .processes = ATOMIC_INIT(1), .files = ATOMIC_INIT(0), .sigpending = ATOMIC_INIT(0), .locked_shm = 0, .user_ns = &init_user_ns, #ifdef CONFIG_USER_SCHED .tg = &init_task_group, #endif }; /* * These routines must be called with the uidhash spinlock held! */ static void uid_hash_insert(struct user_struct *up, struct hlist_head *hashent) { hlist_add_head(&up->uidhash_node, hashent); } static void uid_hash_remove(struct user_struct *up) { hlist_del_init(&up->uidhash_node); put_user_ns(up->user_ns); } #ifdef CONFIG_USER_SCHED static void sched_destroy_user(struct user_struct *up) { sched_destroy_group(up->tg); } static int sched_create_user(struct user_struct *up) { int rc = 0; up->tg = sched_create_group(&root_task_group); if (IS_ERR(up->tg)) rc = -ENOMEM; set_tg_uid(up); return rc; } #else /* CONFIG_USER_SCHED */ static void sched_destroy_user(struct user_struct *up) { } static int sched_create_user(struct user_struct *up) { return 0; } #endif /* CONFIG_USER_SCHED */ #if defined(CONFIG_USER_SCHED) && defined(CONFIG_SYSFS) static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent) { struct user_struct *user; struct hlist_node *h; hlist_for_each_entry(user, h, hashent, uidhash_node) { if (user->uid == uid) { /* possibly resurrect an "almost deleted" object */ if (atomic_inc_return(&user->__count) == 1) cancel_delayed_work(&user->work); return user; } } return NULL; } static struct kset *uids_kset; /* represents the /sys/kernel/uids/ directory */ static DEFINE_MUTEX(uids_mutex); static inline void uids_mutex_lock(void) { mutex_lock(&uids_mutex); } static inline void uids_mutex_unlock(void) { mutex_unlock(&uids_mutex); } /* uid directory attributes */ #ifdef CONFIG_FAIR_GROUP_SCHED static ssize_t cpu_shares_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct user_struct *up = container_of(kobj, struct user_struct, kobj); return sprintf(buf, "%lu\n", sched_group_shares(up->tg)); } static ssize_t cpu_shares_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t size) { struct user_struct *up = container_of(kobj, struct user_struct, kobj); unsigned long shares; int rc; sscanf(buf, "%lu", &shares); rc = sched_group_set_shares(up->tg, shares); return (rc ? rc : size); } static struct kobj_attribute cpu_share_attr = __ATTR(cpu_share, 0644, cpu_shares_show, cpu_shares_store); #endif #ifdef CONFIG_RT_GROUP_SCHED static ssize_t cpu_rt_runtime_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct user_struct *up = container_of(kobj, struct user_struct, kobj); return sprintf(buf, "%ld\n", sched_group_rt_runtime(up->tg)); } static ssize_t cpu_rt_runtime_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t size) { struct user_struct *up = container_of(kobj, struct user_struct, kobj); unsigned long rt_runtime; int rc; sscanf(buf, "%ld", &rt_runtime); rc = sched_group_set_rt_runtime(up->tg, rt_runtime); return (rc ? rc : size); } static struct kobj_attribute cpu_rt_runtime_attr = __ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store); static ssize_t cpu_rt_period_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct user_struct *up = container_of(kobj, struct user_struct, kobj); return sprintf(buf, "%lu\n", sched_group_rt_period(up->tg)); } static ssize_t cpu_rt_period_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t size) { struct user_struct *up = container_of(kobj, struct user_struct, kobj); unsigned long rt_period; int rc; sscanf(buf, "%lu", &rt_period); rc = sched_group_set_rt_period(up->tg, rt_period);


context:
space:
mode: