fs: add ksys_sync() helper; remove in-kernel calls to sys_sync()
Using this helper allows us to avoid the in-kernel calls to the sys_sync() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_sync(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
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@ -86,7 +86,7 @@ static void prom_sync_me(void)
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show_free_areas(0, NULL);
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if (!is_idle_task(current)) {
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local_irq_enable();
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sys_sync();
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ksys_sync();
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local_irq_disable();
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}
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prom_printf("Returning to prom\n");
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@ -660,7 +660,7 @@ static void sysrq_do_reset(struct timer_list *t)
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state->reset_requested = true;
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sys_sync();
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ksys_sync();
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kernel_restart(NULL);
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}
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@ -105,7 +105,7 @@ static void fdatawait_one_bdev(struct block_device *bdev, void *arg)
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* just write metadata (such as inodes or bitmaps) to block device page cache
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* and do not sync it on their own in ->sync_fs().
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*/
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SYSCALL_DEFINE0(sync)
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void ksys_sync(void)
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{
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int nowait = 0, wait = 1;
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@ -117,6 +117,11 @@ SYSCALL_DEFINE0(sync)
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iterate_bdevs(fdatawait_one_bdev, NULL);
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if (unlikely(laptop_mode))
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laptop_sync_completion();
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}
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SYSCALL_DEFINE0(sync)
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{
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ksys_sync();
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return 0;
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}
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@ -960,6 +960,7 @@ int ksys_getdents64(unsigned int fd, struct linux_dirent64 __user *dirent,
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int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg);
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off_t ksys_lseek(unsigned int fd, off_t offset, unsigned int whence);
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ssize_t ksys_read(unsigned int fd, char __user *buf, size_t count);
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void ksys_sync(void);
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/*
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* The following kernel syscall equivalents are just wrappers to fs-internal
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@ -701,7 +701,7 @@ int hibernate(void)
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}
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pr_info("Syncing filesystems ... \n");
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sys_sync();
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ksys_sync();
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pr_info("done.\n");
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error = freeze_processes();
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@ -560,7 +560,7 @@ static int enter_state(suspend_state_t state)
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#ifndef CONFIG_SUSPEND_SKIP_SYNC
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trace_suspend_resume(TPS("sync_filesystems"), 0, true);
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pr_info("Syncing filesystems ... ");
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sys_sync();
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ksys_sync();
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pr_cont("done.\n");
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trace_suspend_resume(TPS("sync_filesystems"), 0, false);
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#endif
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@ -224,7 +224,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
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break;
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printk("Syncing filesystems ... ");
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sys_sync();
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ksys_sync();
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printk("done.\n");
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error = freeze_processes();
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