forked from luck/tmp_suning_uos_patched
nilfs2: remove timedwait ioctl command
This removes NILFS_IOCTL_TIMEDWAIT command from ioctl interface along with the related flags and wait queue. The command is terrible because it just sleeps in the ioctl. I prefer to avoid this by devising means of event polling in userland program. By reconsidering the userland GC daemon, I found this is possible without changing behaviour of the daemon and sacrificing efficiency. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
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76068c4ff1
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1088dcf4c3
@ -578,62 +578,9 @@ int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
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static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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int ret;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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ret = nilfs_clean_segments(inode->i_sb, argp);
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clear_nilfs_cond_nongc_write(NILFS_SB(inode->i_sb)->s_nilfs);
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return ret;
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}
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static int nilfs_ioctl_test_cond(struct the_nilfs *nilfs, int cond)
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{
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return (cond & NILFS_TIMEDWAIT_SEG_WRITE) &&
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nilfs_cond_nongc_write(nilfs);
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}
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static void nilfs_ioctl_clear_cond(struct the_nilfs *nilfs, int cond)
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{
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if (cond & NILFS_TIMEDWAIT_SEG_WRITE)
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clear_nilfs_cond_nongc_write(nilfs);
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}
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static int nilfs_ioctl_timedwait(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_wait_cond wc;
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long ret;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (copy_from_user(&wc, argp, sizeof(wc)))
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return -EFAULT;
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unlock_kernel();
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ret = wc.wc_flags ?
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wait_event_interruptible_timeout(
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nilfs->ns_cleanerd_wq,
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nilfs_ioctl_test_cond(nilfs, wc.wc_cond),
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timespec_to_jiffies(&wc.wc_timeout)) :
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wait_event_interruptible(
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nilfs->ns_cleanerd_wq,
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nilfs_ioctl_test_cond(nilfs, wc.wc_cond));
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lock_kernel();
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nilfs_ioctl_clear_cond(nilfs, wc.wc_cond);
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if (ret > 0) {
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jiffies_to_timespec(ret, &wc.wc_timeout);
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if (copy_to_user(argp, &wc, sizeof(wc)))
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return -EFAULT;
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return 0;
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}
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if (ret != 0)
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return -EINTR;
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return wc.wc_flags ? -ETIME : 0;
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return nilfs_clean_segments(inode->i_sb, argp);
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}
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static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
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@ -679,8 +626,6 @@ int nilfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
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return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
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case NILFS_IOCTL_CLEAN_SEGMENTS:
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return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
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case NILFS_IOCTL_TIMEDWAIT:
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return nilfs_ioctl_timedwait(inode, filp, cmd, argp);
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case NILFS_IOCTL_SYNC:
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return nilfs_ioctl_sync(inode, filp, cmd, argp);
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default:
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@ -871,41 +816,6 @@ nilfs_compat_ioctl_clean_segments(struct inode *inode, struct file *filp,
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inode, filp, cmd, (unsigned long)uargv);
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}
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static int
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nilfs_compat_ioctl_timedwait(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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struct nilfs_wait_cond __user *uwcond;
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struct nilfs_wait_cond32 __user *uwcond32;
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struct timespec ts;
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int cond, flags, ret;
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uwcond = compat_alloc_user_space(sizeof(struct nilfs_wait_cond));
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uwcond32 = compat_ptr(arg);
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if (get_user(cond, &uwcond32->wc_cond) ||
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put_user(cond, &uwcond->wc_cond) ||
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get_user(flags, &uwcond32->wc_flags) ||
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put_user(flags, &uwcond->wc_flags) ||
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get_user(ts.tv_sec, &uwcond32->wc_timeout.tv_sec) ||
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get_user(ts.tv_nsec, &uwcond32->wc_timeout.tv_nsec) ||
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put_user(ts.tv_sec, &uwcond->wc_timeout.tv_sec) ||
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put_user(ts.tv_nsec, &uwcond->wc_timeout.tv_nsec))
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return -EFAULT;
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ret = nilfs_compat_locked_ioctl(inode, filp, cmd,
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(unsigned long)uwcond);
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if (ret < 0)
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return ret;
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if (get_user(ts.tv_sec, &uwcond->wc_timeout.tv_sec) ||
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get_user(ts.tv_nsec, &uwcond->wc_timeout.tv_nsec) ||
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put_user(ts.tv_sec, &uwcond32->wc_timeout.tv_sec) ||
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put_user(ts.tv_nsec, &uwcond32->wc_timeout.tv_nsec))
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return -EFAULT;
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return 0;
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}
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static int nilfs_compat_ioctl_sync(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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@ -943,9 +853,6 @@ long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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case NILFS_IOCTL32_CLEAN_SEGMENTS:
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return nilfs_compat_ioctl_clean_segments(
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inode, filp, NILFS_IOCTL_CLEAN_SEGMENTS, arg);
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case NILFS_IOCTL32_TIMEDWAIT:
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return nilfs_compat_ioctl_timedwait(
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inode, filp, NILFS_IOCTL_TIMEDWAIT, arg);
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case NILFS_IOCTL_SYNC:
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return nilfs_compat_ioctl_sync(inode, filp, cmd, arg);
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default:
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@ -2114,11 +2114,8 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
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nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
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if (update_sr)
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nilfs_commit_gcdat_inode(nilfs);
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} else {
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} else
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nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
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set_nilfs_cond_nongc_write(nilfs);
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wake_up(&nilfs->ns_cleanerd_wq);
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}
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sci->sc_nblk_inc += sci->sc_nblk_this_inc;
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@ -73,7 +73,6 @@ struct the_nilfs *alloc_nilfs(struct block_device *bdev)
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nilfs->ns_gc_inodes_h = NULL;
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INIT_LIST_HEAD(&nilfs->ns_used_segments);
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init_rwsem(&nilfs->ns_segctor_sem);
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init_waitqueue_head(&nilfs->ns_cleanerd_wq);
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return nilfs;
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}
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@ -37,7 +37,6 @@ enum {
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THE_NILFS_LOADED, /* Roll-back/roll-forward has done and
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the latest checkpoint was loaded */
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THE_NILFS_DISCONTINUED, /* 'next' pointer chain has broken */
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THE_NILFS_COND_NONGC_WRITE, /* Condition to wake up cleanerd */
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};
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/**
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@ -74,7 +73,6 @@ enum {
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* @ns_gc_dat: shadow inode of the DAT file inode for GC
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* @ns_gc_inodes: dummy inodes to keep live blocks
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* @ns_gc_inodes_h: hash list to keep dummy inode holding live blocks
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* @ns_cleanerd_wq: wait queue for cleanerd
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* @ns_blocksize_bits: bit length of block size
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* @ns_nsegments: number of segments in filesystem
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* @ns_blocks_per_segment: number of blocks per segment
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@ -151,9 +149,6 @@ struct the_nilfs {
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struct list_head ns_gc_inodes;
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struct hlist_head *ns_gc_inodes_h;
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/* cleanerd */
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wait_queue_head_t ns_cleanerd_wq;
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/* Disk layout information (static) */
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unsigned int ns_blocksize_bits;
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unsigned long ns_nsegments;
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@ -186,7 +181,6 @@ static inline int nilfs_##name(struct the_nilfs *nilfs) \
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THE_NILFS_FNS(INIT, init)
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THE_NILFS_FNS(LOADED, loaded)
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THE_NILFS_FNS(DISCONTINUED, discontinued)
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THE_NILFS_FNS(COND_NONGC_WRITE, cond_nongc_write)
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void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
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struct the_nilfs *alloc_nilfs(struct block_device *);
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@ -763,18 +763,6 @@ struct nilfs_bdesc {
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__u32 bd_level;
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};
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#define NILFS_TIMEDWAIT_WRITE_LOCKED 0x1
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#define NILFS_TIMEDWAIT_SEG_WRITE 0x2
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/**
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* struct nilfs_wait_cond -
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*/
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struct nilfs_wait_cond {
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int wc_cond;
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int wc_flags;
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struct timespec wc_timeout;
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};
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#define NILFS_IOCTL_IDENT 'n'
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#define NILFS_IOCTL_CHANGE_CPMODE \
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@ -795,8 +783,6 @@ struct nilfs_wait_cond {
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_IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
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#define NILFS_IOCTL_CLEAN_SEGMENTS \
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_IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
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#define NILFS_IOCTL_TIMEDWAIT \
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_IOWR(NILFS_IOCTL_IDENT, 0x89, struct nilfs_wait_cond)
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#define NILFS_IOCTL_SYNC \
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_IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
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#define NILFS_IOCTL_RESIZE \
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@ -827,12 +813,6 @@ struct nilfs_sustat32 {
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compat_time_t ss_nongc_ctime;
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};
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struct nilfs_wait_cond32 {
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compat_int_t wc_cond;
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compat_int_t wc_flags;
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struct compat_timespec wc_timeout;
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};
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#define NILFS_IOCTL32_CHANGE_CPMODE \
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_IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode32)
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#define NILFS_IOCTL32_GET_CPINFO \
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@ -847,8 +827,6 @@ struct nilfs_wait_cond32 {
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_IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv32)
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#define NILFS_IOCTL32_CLEAN_SEGMENTS \
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_IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv32[5])
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#define NILFS_IOCTL32_TIMEDWAIT \
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_IOWR(NILFS_IOCTL_IDENT, 0x89, struct nilfs_wait_cond32)
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#endif /* CONFIG_COMPAT */
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#endif /* _LINUX_NILFS_FS_H */
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