kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

nilfs2: remove timedwait ioctl command

Browse source 
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:
Ryusuke Konishi 2009-04-06 19:01:51 -07:00 committed by Linus Torvalds
parent 76068c4ff1
commit 1088dcf4c3
5 changed files with 2 additions and 127 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

95
fs/nilfs2/ioctl.c
View file

@ -578,62 +578,9 @@ int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
ret = nilfs_clean_segments(inode->i_sb, argp);
clear_nilfs_cond_nongc_write(NILFS_SB(inode->i_sb)->s_nilfs);
return ret;
}
static int nilfs_ioctl_test_cond(struct the_nilfs *nilfs, int cond)
{
return (cond & NILFS_TIMEDWAIT_SEG_WRITE) &&
nilfs_cond_nongc_write(nilfs);
}
static void nilfs_ioctl_clear_cond(struct the_nilfs *nilfs, int cond)
{
if (cond & NILFS_TIMEDWAIT_SEG_WRITE)
clear_nilfs_cond_nongc_write(nilfs);
}
static int nilfs_ioctl_timedwait(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
struct nilfs_wait_cond wc;
long ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&wc, argp, sizeof(wc)))
return -EFAULT;
unlock_kernel();
ret = wc.wc_flags ?
wait_event_interruptible_timeout(
nilfs->ns_cleanerd_wq,
nilfs_ioctl_test_cond(nilfs, wc.wc_cond),
timespec_to_jiffies(&wc.wc_timeout)) :
wait_event_interruptible(
nilfs->ns_cleanerd_wq,
nilfs_ioctl_test_cond(nilfs, wc.wc_cond));
lock_kernel();
nilfs_ioctl_clear_cond(nilfs, wc.wc_cond);
if (ret > 0) {
jiffies_to_timespec(ret, &wc.wc_timeout);
if (copy_to_user(argp, &wc, sizeof(wc)))
return -EFAULT;
return 0;
}
if (ret != 0)
return -EINTR;
return wc.wc_flags ? -ETIME : 0;
return nilfs_clean_segments(inode->i_sb, argp);
}
static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
@ -679,8 +626,6 @@ int nilfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
case NILFS_IOCTL_CLEAN_SEGMENTS:
return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
case NILFS_IOCTL_TIMEDWAIT:
return nilfs_ioctl_timedwait(inode, filp, cmd, argp);
case NILFS_IOCTL_SYNC:
return nilfs_ioctl_sync(inode, filp, cmd, argp);
default:
@ -871,41 +816,6 @@ nilfs_compat_ioctl_clean_segments(struct inode *inode, struct file *filp,
inode, filp, cmd, (unsigned long)uargv);
}
static int
nilfs_compat_ioctl_timedwait(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct nilfs_wait_cond __user *uwcond;
struct nilfs_wait_cond32 __user *uwcond32;
struct timespec ts;
int cond, flags, ret;
uwcond = compat_alloc_user_space(sizeof(struct nilfs_wait_cond));
uwcond32 = compat_ptr(arg);
if (get_user(cond, &uwcond32->wc_cond) ||
put_user(cond, &uwcond->wc_cond) ||
get_user(flags, &uwcond32->wc_flags) ||
put_user(flags, &uwcond->wc_flags) ||
get_user(ts.tv_sec, &uwcond32->wc_timeout.tv_sec) ||
get_user(ts.tv_nsec, &uwcond32->wc_timeout.tv_nsec) ||
put_user(ts.tv_sec, &uwcond->wc_timeout.tv_sec) ||
put_user(ts.tv_nsec, &uwcond->wc_timeout.tv_nsec))
return -EFAULT;
ret = nilfs_compat_locked_ioctl(inode, filp, cmd,
(unsigned long)uwcond);
if (ret < 0)
return ret;
if (get_user(ts.tv_sec, &uwcond->wc_timeout.tv_sec) ||
get_user(ts.tv_nsec, &uwcond->wc_timeout.tv_nsec) ||
put_user(ts.tv_sec, &uwcond32->wc_timeout.tv_sec) ||
put_user(ts.tv_nsec, &uwcond32->wc_timeout.tv_nsec))
return -EFAULT;
return 0;
}
static int nilfs_compat_ioctl_sync(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
@ -943,9 +853,6 @@ long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case NILFS_IOCTL32_CLEAN_SEGMENTS:
return nilfs_compat_ioctl_clean_segments(
inode, filp, NILFS_IOCTL_CLEAN_SEGMENTS, arg);
case NILFS_IOCTL32_TIMEDWAIT:
return nilfs_compat_ioctl_timedwait(
inode, filp, NILFS_IOCTL_TIMEDWAIT, arg);
case NILFS_IOCTL_SYNC:
return nilfs_compat_ioctl_sync(inode, filp, cmd, arg);
default:

5
fs/nilfs2/segment.c
View file

@ -2114,11 +2114,8 @@ static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
if (update_sr)
nilfs_commit_gcdat_inode(nilfs);
} else {
} else
nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
set_nilfs_cond_nongc_write(nilfs);
wake_up(&nilfs->ns_cleanerd_wq);
}
sci->sc_nblk_inc += sci->sc_nblk_this_inc;

1
fs/nilfs2/the_nilfs.c
View file

@ -73,7 +73,6 @@ struct the_nilfs *alloc_nilfs(struct block_device *bdev)
nilfs->ns_gc_inodes_h = NULL;
INIT_LIST_HEAD(&nilfs->ns_used_segments);
init_rwsem(&nilfs->ns_segctor_sem);
init_waitqueue_head(&nilfs->ns_cleanerd_wq);
return nilfs;
}

6
fs/nilfs2/the_nilfs.h
View file

@ -37,7 +37,6 @@ enum {
THE_NILFS_LOADED, /* Roll-back/roll-forward has done and
the latest checkpoint was loaded */
THE_NILFS_DISCONTINUED, /* 'next' pointer chain has broken */
THE_NILFS_COND_NONGC_WRITE, /* Condition to wake up cleanerd */
};
/**
@ -74,7 +73,6 @@ enum {
* @ns_gc_dat: shadow inode of the DAT file inode for GC
* @ns_gc_inodes: dummy inodes to keep live blocks
* @ns_gc_inodes_h: hash list to keep dummy inode holding live blocks
* @ns_cleanerd_wq: wait queue for cleanerd
* @ns_blocksize_bits: bit length of block size
* @ns_nsegments: number of segments in filesystem
* @ns_blocks_per_segment: number of blocks per segment
@ -151,9 +149,6 @@ struct the_nilfs {
struct list_head ns_gc_inodes;
struct hlist_head *ns_gc_inodes_h;
/* cleanerd */
wait_queue_head_t ns_cleanerd_wq;
/* Disk layout information (static) */
unsigned int ns_blocksize_bits;
unsigned long ns_nsegments;
@ -186,7 +181,6 @@ static inline int nilfs_##name(struct the_nilfs *nilfs) \
THE_NILFS_FNS(INIT, init)
THE_NILFS_FNS(LOADED, loaded)
THE_NILFS_FNS(DISCONTINUED, discontinued)
THE_NILFS_FNS(COND_NONGC_WRITE, cond_nongc_write)
void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
struct the_nilfs *alloc_nilfs(struct block_device *);

22
include/linux/nilfs2_fs.h
View file

@ -763,18 +763,6 @@ struct nilfs_bdesc {
__u32 bd_level;
};
#define NILFS_TIMEDWAIT_WRITE_LOCKED 0x1
#define NILFS_TIMEDWAIT_SEG_WRITE 0x2
/**
* struct nilfs_wait_cond -
*/
struct nilfs_wait_cond {
int wc_cond;
int wc_flags;
struct timespec wc_timeout;
};
#define NILFS_IOCTL_IDENT 'n'
#define NILFS_IOCTL_CHANGE_CPMODE \
@ -795,8 +783,6 @@ struct nilfs_wait_cond {
_IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
#define NILFS_IOCTL_CLEAN_SEGMENTS \
_IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
#define NILFS_IOCTL_TIMEDWAIT \
_IOWR(NILFS_IOCTL_IDENT, 0x89, struct nilfs_wait_cond)
#define NILFS_IOCTL_SYNC \
_IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
#define NILFS_IOCTL_RESIZE \
@ -827,12 +813,6 @@ struct nilfs_sustat32 {
compat_time_t ss_nongc_ctime;
};
struct nilfs_wait_cond32 {
compat_int_t wc_cond;
compat_int_t wc_flags;
struct compat_timespec wc_timeout;
};
#define NILFS_IOCTL32_CHANGE_CPMODE \
_IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode32)
#define NILFS_IOCTL32_GET_CPINFO \
@ -847,8 +827,6 @@ struct nilfs_wait_cond32 {
_IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv32)
#define NILFS_IOCTL32_CLEAN_SEGMENTS \
_IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv32[5])
#define NILFS_IOCTL32_TIMEDWAIT \
_IOWR(NILFS_IOCTL_IDENT, 0x89, struct nilfs_wait_cond32)
#endif /* CONFIG_COMPAT */
#endif /* _LINUX_NILFS_FS_H */