diff options
Diffstat (limited to 'fs/notify/inotify/inotify_user.c')
-rw-r--r-- | fs/notify/inotify/inotify_user.c | 114 |
1 files changed, 47 insertions, 67 deletions
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c index 8445fbc8985c..60f954a891ab 100644 --- a/fs/notify/inotify/inotify_user.c +++ b/fs/notify/inotify/inotify_user.c @@ -40,6 +40,7 @@ #include <linux/wait.h> #include "inotify.h" +#include "../fdinfo.h" #include <asm/ioctls.h> @@ -264,7 +265,7 @@ static ssize_t inotify_read(struct file *file, char __user *buf, ret = -EAGAIN; if (file->f_flags & O_NONBLOCK) break; - ret = -EINTR; + ret = -ERESTARTSYS; if (signal_pending(current)) break; @@ -280,23 +281,14 @@ static ssize_t inotify_read(struct file *file, char __user *buf, return ret; } -static int inotify_fasync(int fd, struct file *file, int on) -{ - struct fsnotify_group *group = file->private_data; - - return fasync_helper(fd, file, on, &group->inotify_data.fa) >= 0 ? 0 : -EIO; -} - static int inotify_release(struct inode *ignored, struct file *file) { struct fsnotify_group *group = file->private_data; pr_debug("%s: group=%p\n", __func__, group); - fsnotify_clear_marks_by_group(group); - /* free this group, matching get was inotify_init->fsnotify_obtain_group */ - fsnotify_put_group(group); + fsnotify_destroy_group(group); return 0; } @@ -335,9 +327,10 @@ static long inotify_ioctl(struct file *file, unsigned int cmd, } static const struct file_operations inotify_fops = { + .show_fdinfo = inotify_show_fdinfo, .poll = inotify_poll, .read = inotify_read, - .fasync = inotify_fasync, + .fasync = fsnotify_fasync, .release = inotify_release, .unlocked_ioctl = inotify_ioctl, .compat_ioctl = inotify_ioctl, @@ -363,27 +356,23 @@ static int inotify_find_inode(const char __user *dirname, struct path *path, uns } static int inotify_add_to_idr(struct idr *idr, spinlock_t *idr_lock, - int *last_wd, struct inotify_inode_mark *i_mark) { int ret; - do { - if (unlikely(!idr_pre_get(idr, GFP_KERNEL))) - return -ENOMEM; + idr_preload(GFP_KERNEL); + spin_lock(idr_lock); - spin_lock(idr_lock); - ret = idr_get_new_above(idr, i_mark, *last_wd + 1, - &i_mark->wd); + ret = idr_alloc_cyclic(idr, i_mark, 1, 0, GFP_NOWAIT); + if (ret >= 0) { /* we added the mark to the idr, take a reference */ - if (!ret) { - *last_wd = i_mark->wd; - fsnotify_get_mark(&i_mark->fsn_mark); - } - spin_unlock(idr_lock); - } while (ret == -EAGAIN); + i_mark->wd = ret; + fsnotify_get_mark(&i_mark->fsn_mark); + } - return ret; + spin_unlock(idr_lock); + idr_preload_end(); + return ret < 0 ? ret : 0; } static struct inotify_inode_mark *inotify_idr_find_locked(struct fsnotify_group *group, @@ -519,13 +508,13 @@ void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark, struct fsnotify_event_private_data *fsn_event_priv; int ret; + i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); + ignored_event = fsnotify_create_event(NULL, FS_IN_IGNORED, NULL, FSNOTIFY_EVENT_NONE, NULL, 0, GFP_NOFS); if (!ignored_event) - return; - - i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark); + goto skip_send_ignore; event_priv = kmem_cache_alloc(event_priv_cachep, GFP_NOFS); if (unlikely(!event_priv)) @@ -533,6 +522,7 @@ void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark, fsn_event_priv = &event_priv->fsnotify_event_priv_data; + fsnotify_get_group(group); fsn_event_priv->group = group; event_priv->wd = i_mark->wd; @@ -546,9 +536,9 @@ void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark, } skip_send_ignore: - /* matches the reference taken when the event was created */ - fsnotify_put_event(ignored_event); + if (ignored_event) + fsnotify_put_event(ignored_event); /* remove this mark from the idr */ inotify_remove_from_idr(group, i_mark); @@ -577,10 +567,7 @@ static int inotify_update_existing_watch(struct fsnotify_group *group, int add = (arg & IN_MASK_ADD); int ret; - /* don't allow invalid bits: we don't want flags set */ mask = inotify_arg_to_mask(arg); - if (unlikely(!(mask & IN_ALL_EVENTS))) - return -EINVAL; fsn_mark = fsnotify_find_inode_mark(group, inode); if (!fsn_mark) @@ -630,10 +617,7 @@ static int inotify_new_watch(struct fsnotify_group *group, struct idr *idr = &group->inotify_data.idr; spinlock_t *idr_lock = &group->inotify_data.idr_lock; - /* don't allow invalid bits: we don't want flags set */ mask = inotify_arg_to_mask(arg); - if (unlikely(!(mask & IN_ALL_EVENTS))) - return -EINVAL; tmp_i_mark = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL); if (unlikely(!tmp_i_mark)) @@ -647,13 +631,13 @@ static int inotify_new_watch(struct fsnotify_group *group, if (atomic_read(&group->inotify_data.user->inotify_watches) >= inotify_max_user_watches) goto out_err; - ret = inotify_add_to_idr(idr, idr_lock, &group->inotify_data.last_wd, - tmp_i_mark); + ret = inotify_add_to_idr(idr, idr_lock, tmp_i_mark); if (ret) goto out_err; /* we are on the idr, now get on the inode */ - ret = fsnotify_add_mark(&tmp_i_mark->fsn_mark, group, inode, NULL, 0); + ret = fsnotify_add_mark_locked(&tmp_i_mark->fsn_mark, group, inode, + NULL, 0); if (ret) { /* we failed to get on the inode, get off the idr */ inotify_remove_from_idr(group, tmp_i_mark); @@ -677,19 +661,13 @@ static int inotify_update_watch(struct fsnotify_group *group, struct inode *inod { int ret = 0; -retry: + mutex_lock(&group->mark_mutex); /* try to update and existing watch with the new arg */ ret = inotify_update_existing_watch(group, inode, arg); /* no mark present, try to add a new one */ if (ret == -ENOENT) ret = inotify_new_watch(group, inode, arg); - /* - * inotify_new_watch could race with another thread which did an - * inotify_new_watch between the update_existing and the add watch - * here, go back and try to update an existing mark again. - */ - if (ret == -EEXIST) - goto retry; + mutex_unlock(&group->mark_mutex); return ret; } @@ -706,13 +684,11 @@ static struct fsnotify_group *inotify_new_group(unsigned int max_events) spin_lock_init(&group->inotify_data.idr_lock); idr_init(&group->inotify_data.idr); - group->inotify_data.last_wd = 0; - group->inotify_data.fa = NULL; group->inotify_data.user = get_current_user(); if (atomic_inc_return(&group->inotify_data.user->inotify_devs) > inotify_max_user_instances) { - fsnotify_put_group(group); + fsnotify_destroy_group(group); return ERR_PTR(-EMFILE); } @@ -741,7 +717,7 @@ SYSCALL_DEFINE1(inotify_init1, int, flags) ret = anon_inode_getfd("inotify", &inotify_fops, group, O_RDONLY | flags); if (ret < 0) - fsnotify_put_group(group); + fsnotify_destroy_group(group); return ret; } @@ -757,16 +733,20 @@ SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname, struct fsnotify_group *group; struct inode *inode; struct path path; - struct file *filp; - int ret, fput_needed; + struct fd f; + int ret; unsigned flags = 0; - filp = fget_light(fd, &fput_needed); - if (unlikely(!filp)) + /* don't allow invalid bits: we don't want flags set */ + if (unlikely(!(mask & ALL_INOTIFY_BITS))) + return -EINVAL; + + f = fdget(fd); + if (unlikely(!f.file)) return -EBADF; /* verify that this is indeed an inotify instance */ - if (unlikely(filp->f_op != &inotify_fops)) { + if (unlikely(f.file->f_op != &inotify_fops)) { ret = -EINVAL; goto fput_and_out; } @@ -782,13 +762,13 @@ SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname, /* inode held in place by reference to path; group by fget on fd */ inode = path.dentry->d_inode; - group = filp->private_data; + group = f.file->private_data; /* create/update an inode mark */ ret = inotify_update_watch(group, inode, mask); path_put(&path); fput_and_out: - fput_light(filp, fput_needed); + fdput(f); return ret; } @@ -796,19 +776,19 @@ SYSCALL_DEFINE2(inotify_rm_watch, int, fd, __s32, wd) { struct fsnotify_group *group; struct inotify_inode_mark *i_mark; - struct file *filp; - int ret = 0, fput_needed; + struct fd f; + int ret = 0; - filp = fget_light(fd, &fput_needed); - if (unlikely(!filp)) + f = fdget(fd); + if (unlikely(!f.file)) return -EBADF; /* verify that this is indeed an inotify instance */ ret = -EINVAL; - if (unlikely(filp->f_op != &inotify_fops)) + if (unlikely(f.file->f_op != &inotify_fops)) goto out; - group = filp->private_data; + group = f.file->private_data; ret = -EINVAL; i_mark = inotify_idr_find(group, wd); @@ -817,13 +797,13 @@ SYSCALL_DEFINE2(inotify_rm_watch, int, fd, __s32, wd) ret = 0; - fsnotify_destroy_mark(&i_mark->fsn_mark); + fsnotify_destroy_mark(&i_mark->fsn_mark, group); /* match ref taken by inotify_idr_find */ fsnotify_put_mark(&i_mark->fsn_mark); out: - fput_light(filp, fput_needed); + fdput(f); return ret; } |