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authorLinus Torvalds <torvalds@linux-foundation.org>2023-11-04 02:15:47 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2023-11-04 02:15:47 +0100
commitb06f58ad8e8c4154bc88d83b4fd70f74ede50193 (patch)
tree456b594b793a48bf76d0e9deeb3998a1baa88a8c /fs/kernfs
parentMerge tag 'char-misc-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff)
parentfirmware_loader: Abort all upcoming firmware load request once reboot triggered (diff)
downloadlinux-b06f58ad8e8c4154bc88d83b4fd70f74ede50193.tar.xz
linux-b06f58ad8e8c4154bc88d83b4fd70f74ede50193.zip
Merge tag 'driver-core-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH: "Here is the set of driver core updates for 6.7-rc1. Nothing major in here at all, just a small number of changes including: - minor cleanups and updates from Andy Shevchenko - __counted_by addition - firmware_loader update for aborting loads cleaner - other minor changes, details in the shortlog - documentation update All of these have been in linux-next for a while with no reported issues" * tag 'driver-core-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (21 commits) firmware_loader: Abort all upcoming firmware load request once reboot triggered firmware_loader: Refactor kill_pending_fw_fallback_reqs() Documentation: security-bugs.rst: linux-distros relaxed their rules driver core: Release all resources during unbind before updating device links driver core: class: remove boilerplate code driver core: platform: Annotate struct irq_affinity_devres with __counted_by resource: Constify resource crosscheck APIs resource: Unify next_resource() and next_resource_skip_children() resource: Reuse for_each_resource() macro PCI: Implement custom llseek for sysfs resource entries kernfs: sysfs: support custom llseek method for sysfs entries debugfs: Fix __rcu type comparison warning device property: Replace custom implementation of COUNT_ARGS() drivers: base: test: Make property entry API test modular driver core: Add missing parameter description to __fwnode_link_add() device property: Clarify usage scope of some struct fwnode_handle members devres: rename the first parameter of devm_add_action(_or_reset) driver core: platform: Unify the firmware node type check driver core: platform: Use temporary variable in platform_device_add() driver core: platform: Refactor error path in a couple places ...
Diffstat (limited to 'fs/kernfs')
-rw-r--r--fs/kernfs/file.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index aaa76410e550..f0cb729e9a97 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -854,6 +854,33 @@ static __poll_t kernfs_fop_poll(struct file *filp, poll_table *wait)
return ret;
}
+static loff_t kernfs_fop_llseek(struct file *file, loff_t offset, int whence)
+{
+ struct kernfs_open_file *of = kernfs_of(file);
+ const struct kernfs_ops *ops;
+ loff_t ret;
+
+ /*
+ * @of->mutex nests outside active ref and is primarily to ensure that
+ * the ops aren't called concurrently for the same open file.
+ */
+ mutex_lock(&of->mutex);
+ if (!kernfs_get_active(of->kn)) {
+ mutex_unlock(&of->mutex);
+ return -ENODEV;
+ }
+
+ ops = kernfs_ops(of->kn);
+ if (ops->llseek)
+ ret = ops->llseek(of, offset, whence);
+ else
+ ret = generic_file_llseek(file, offset, whence);
+
+ kernfs_put_active(of->kn);
+ mutex_unlock(&of->mutex);
+ return ret;
+}
+
static void kernfs_notify_workfn(struct work_struct *work)
{
struct kernfs_node *kn;
@@ -956,7 +983,7 @@ EXPORT_SYMBOL_GPL(kernfs_notify);
const struct file_operations kernfs_file_fops = {
.read_iter = kernfs_fop_read_iter,
.write_iter = kernfs_fop_write_iter,
- .llseek = generic_file_llseek,
+ .llseek = kernfs_fop_llseek,
.mmap = kernfs_fop_mmap,
.open = kernfs_fop_open,
.release = kernfs_fop_release,