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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-02 20:25:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-02 20:25:04 -0700
commitaab174f0df5d72d31caccf281af5f614fa254578 (patch)
tree2a172c5009c4ac8755e858593154c258ce7709a0 /kernel/events/core.c
parentca41cc96b2813221b05af57d0355157924de5a07 (diff)
parent2bd2c1941f141ad780135ccc1cd08ca71a24f10a (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs update from Al Viro: - big one - consolidation of descriptor-related logics; almost all of that is moved to fs/file.c (BTW, I'm seriously tempted to rename the result to fd.c. As it is, we have a situation when file_table.c is about handling of struct file and file.c is about handling of descriptor tables; the reasons are historical - file_table.c used to be about a static array of struct file we used to have way back). A lot of stray ends got cleaned up and converted to saner primitives, disgusting mess in android/binder.c is still disgusting, but at least doesn't poke so much in descriptor table guts anymore. A bunch of relatively minor races got fixed in process, plus an ext4 struct file leak. - related thing - fget_light() partially unuglified; see fdget() in there (and yes, it generates the code as good as we used to have). - also related - bits of Cyrill's procfs stuff that got entangled into that work; _not_ all of it, just the initial move to fs/proc/fd.c and switch of fdinfo to seq_file. - Alex's fs/coredump.c spiltoff - the same story, had been easier to take that commit than mess with conflicts. The rest is a separate pile, this was just a mechanical code movement. - a few misc patches all over the place. Not all for this cycle, there'll be more (and quite a few currently sit in akpm's tree)." Fix up trivial conflicts in the android binder driver, and some fairly simple conflicts due to two different changes to the sock_alloc_file() interface ("take descriptor handling from sock_alloc_file() to callers" vs "net: Providing protocol type via system.sockprotoname xattr of /proc/PID/fd entries" adding a dentry name to the socket) * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (72 commits) MAX_LFS_FILESIZE should be a loff_t compat: fs: Generic compat_sys_sendfile implementation fs: push rcu_barrier() from deactivate_locked_super() to filesystems btrfs: reada_extent doesn't need kref for refcount coredump: move core dump functionality into its own file coredump: prevent double-free on an error path in core dumper usb/gadget: fix misannotations fcntl: fix misannotations ceph: don't abuse d_delete() on failure exits hypfs: ->d_parent is never NULL or negative vfs: delete surplus inode NULL check switch simple cases of fget_light to fdget new helpers: fdget()/fdput() switch o2hb_region_dev_write() to fget_light() proc_map_files_readdir(): don't bother with grabbing files make get_file() return its argument vhost_set_vring(): turn pollstart/pollstop into bool switch prctl_set_mm_exe_file() to fget_light() switch xfs_find_handle() to fget_light() switch xfs_swapext() to fget_light() ...
Diffstat (limited to 'kernel/events/core.c')
-rw-r--r--kernel/events/core.c72
1 files changed, 31 insertions, 41 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index deec4e50eb30..f16f3c58f11a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -468,14 +468,13 @@ static inline int perf_cgroup_connect(int fd, struct perf_event *event,
{
struct perf_cgroup *cgrp;
struct cgroup_subsys_state *css;
- struct file *file;
- int ret = 0, fput_needed;
+ struct fd f = fdget(fd);
+ int ret = 0;
- file = fget_light(fd, &fput_needed);
- if (!file)
+ if (!f.file)
return -EBADF;
- css = cgroup_css_from_dir(file, perf_subsys_id);
+ css = cgroup_css_from_dir(f.file, perf_subsys_id);
if (IS_ERR(css)) {
ret = PTR_ERR(css);
goto out;
@@ -501,7 +500,7 @@ static inline int perf_cgroup_connect(int fd, struct perf_event *event,
ret = -EINVAL;
}
out:
- fput_light(file, fput_needed);
+ fdput(f);
return ret;
}
@@ -3234,21 +3233,18 @@ unlock:
static const struct file_operations perf_fops;
-static struct file *perf_fget_light(int fd, int *fput_needed)
+static inline int perf_fget_light(int fd, struct fd *p)
{
- struct file *file;
-
- file = fget_light(fd, fput_needed);
- if (!file)
- return ERR_PTR(-EBADF);
+ struct fd f = fdget(fd);
+ if (!f.file)
+ return -EBADF;
- if (file->f_op != &perf_fops) {
- fput_light(file, *fput_needed);
- *fput_needed = 0;
- return ERR_PTR(-EBADF);
+ if (f.file->f_op != &perf_fops) {
+ fdput(f);
+ return -EBADF;
}
-
- return file;
+ *p = f;
+ return 0;
}
static int perf_event_set_output(struct perf_event *event,
@@ -3280,22 +3276,19 @@ static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case PERF_EVENT_IOC_SET_OUTPUT:
{
- struct file *output_file = NULL;
- struct perf_event *output_event = NULL;
- int fput_needed = 0;
int ret;
-
if (arg != -1) {
- output_file = perf_fget_light(arg, &fput_needed);
- if (IS_ERR(output_file))
- return PTR_ERR(output_file);
- output_event = output_file->private_data;
+ struct perf_event *output_event;
+ struct fd output;
+ ret = perf_fget_light(arg, &output);
+ if (ret)
+ return ret;
+ output_event = output.file->private_data;
+ ret = perf_event_set_output(event, output_event);
+ fdput(output);
+ } else {
+ ret = perf_event_set_output(event, NULL);
}
-
- ret = perf_event_set_output(event, output_event);
- if (output_event)
- fput_light(output_file, fput_needed);
-
return ret;
}
@@ -6443,12 +6436,11 @@ SYSCALL_DEFINE5(perf_event_open,
struct perf_event_attr attr;
struct perf_event_context *ctx;
struct file *event_file = NULL;
- struct file *group_file = NULL;
+ struct fd group = {NULL, 0};
struct task_struct *task = NULL;
struct pmu *pmu;
int event_fd;
int move_group = 0;
- int fput_needed = 0;
int err;
/* for future expandability... */
@@ -6478,17 +6470,15 @@ SYSCALL_DEFINE5(perf_event_open,
if ((flags & PERF_FLAG_PID_CGROUP) && (pid == -1 || cpu == -1))
return -EINVAL;
- event_fd = get_unused_fd_flags(O_RDWR);
+ event_fd = get_unused_fd();
if (event_fd < 0)
return event_fd;
if (group_fd != -1) {
- group_file = perf_fget_light(group_fd, &fput_needed);
- if (IS_ERR(group_file)) {
- err = PTR_ERR(group_file);
+ err = perf_fget_light(group_fd, &group);
+ if (err)
goto err_fd;
- }
- group_leader = group_file->private_data;
+ group_leader = group.file->private_data;
if (flags & PERF_FLAG_FD_OUTPUT)
output_event = group_leader;
if (flags & PERF_FLAG_FD_NO_GROUP)
@@ -6664,7 +6654,7 @@ SYSCALL_DEFINE5(perf_event_open,
* of the group leader will find the pointer to itself in
* perf_group_detach().
*/
- fput_light(group_file, fput_needed);
+ fdput(group);
fd_install(event_fd, event_file);
return event_fd;
@@ -6678,7 +6668,7 @@ err_task:
if (task)
put_task_struct(task);
err_group_fd:
- fput_light(group_file, fput_needed);
+ fdput(group);
err_fd:
put_unused_fd(event_fd);
return err;