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| author | Kay Sievers <kay.sievers@vrfy.org> | 2011-07-12 20:48:39 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-07-20 20:47:50 -0400 |
| commit | f15146380d28b746df3c8b81b392812eb982382a (patch) | |
| tree | bf43b38b60c21bd01b007c9636062783d406eb29 /drivers | |
| parent | 72c5052ddc3956d847f21c2b8d55c93664a51b2c (diff) | |
| download | linux-3.10-f15146380d28b746df3c8b81b392812eb982382a.tar.gz linux-3.10-f15146380d28b746df3c8b81b392812eb982382a.tar.bz2 linux-3.10-f15146380d28b746df3c8b81b392812eb982382a.zip | |
fs: seq_file - add event counter to simplify poll() support
Moving the event counter into the dynamically allocated 'struc seq_file'
allows poll() support without the need to allocate its own tracking
structure.
All current users are switched over to use the new counter.
Requested-by: Andrew Morton akpm@linux-foundation.org
Acked-by: NeilBrown <neilb@suse.de>
Tested-by: Lucas De Marchi lucas.demarchi@profusion.mobi
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/md.c | 26 |
1 files changed, 8 insertions, 18 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 91e31e260b4..dfc9425db70 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6394,16 +6394,11 @@ static void md_seq_stop(struct seq_file *seq, void *v) mddev_put(mddev); } -struct mdstat_info { - int event; -}; - static int md_seq_show(struct seq_file *seq, void *v) { mddev_t *mddev = v; sector_t sectors; mdk_rdev_t *rdev; - struct mdstat_info *mi = seq->private; struct bitmap *bitmap; if (v == (void*)1) { @@ -6415,7 +6410,7 @@ static int md_seq_show(struct seq_file *seq, void *v) spin_unlock(&pers_lock); seq_printf(seq, "\n"); - mi->event = atomic_read(&md_event_count); + seq->poll_event = atomic_read(&md_event_count); return 0; } if (v == (void*)2) { @@ -6527,26 +6522,21 @@ static const struct seq_operations md_seq_ops = { static int md_seq_open(struct inode *inode, struct file *file) { + struct seq_file *seq; int error; - struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); - if (mi == NULL) - return -ENOMEM; error = seq_open(file, &md_seq_ops); if (error) - kfree(mi); - else { - struct seq_file *p = file->private_data; - p->private = mi; - mi->event = atomic_read(&md_event_count); - } + return error; + + seq = file->private_data; + seq->poll_event = atomic_read(&md_event_count); return error; } static unsigned int mdstat_poll(struct file *filp, poll_table *wait) { - struct seq_file *m = filp->private_data; - struct mdstat_info *mi = m->private; + struct seq_file *seq = filp->private_data; int mask; poll_wait(filp, &md_event_waiters, wait); @@ -6554,7 +6544,7 @@ static unsigned int mdstat_poll(struct file *filp, poll_table *wait) /* always allow read */ mask = POLLIN | POLLRDNORM; - if (mi->event != atomic_read(&md_event_count)) + if (seq->poll_event != atomic_read(&md_event_count)) mask |= POLLERR | POLLPRI; return mask; } |