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authorAl Viro <viro@zeniv.linux.org.uk>2014-04-19 14:24:18 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-08-07 14:40:08 -0400
commit54a4d58a6459a93fc6ee898354b3d2ffb80dd03a (patch)
treec47084891155b17c7fadad5a6a4a4900582bfedc /kernel
parentb8f00e6be46f4c9a112e05fd692712873c4c4048 (diff)
downloadlinux-54a4d58a6459a93fc6ee898354b3d2ffb80dd03a.tar.bz2
acct: simplify check_free_space()
a) file can't be NULL b) file can't be changed under us c) all writes are serialized by acct->lock; no need to mess with spinlock there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/acct.c50
1 files changed, 11 insertions, 39 deletions
diff --git a/kernel/acct.c b/kernel/acct.c
index f9ef9db55c0e..019f012a3c6f 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -93,64 +93,36 @@ static LIST_HEAD(acct_list);
/*
* Check the amount of free space and suspend/resume accordingly.
*/
-static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
+static int check_free_space(struct bsd_acct_struct *acct)
{
struct kstatfs sbuf;
- int res;
- int act;
- u64 resume;
- u64 suspend;
- spin_lock(&acct_lock);
- res = acct->active;
- if (!file || time_is_before_jiffies(acct->needcheck))
+ if (time_is_before_jiffies(acct->needcheck))
goto out;
- spin_unlock(&acct_lock);
/* May block */
- if (vfs_statfs(&file->f_path, &sbuf))
- return res;
- suspend = sbuf.f_blocks * SUSPEND;
- resume = sbuf.f_blocks * RESUME;
-
- do_div(suspend, 100);
- do_div(resume, 100);
-
- if (sbuf.f_bavail <= suspend)
- act = -1;
- else if (sbuf.f_bavail >= resume)
- act = 1;
- else
- act = 0;
-
- /*
- * If some joker switched acct->file under us we'ld better be
- * silent and _not_ touch anything.
- */
- spin_lock(&acct_lock);
- if (file != acct->file) {
- if (act)
- res = act > 0;
+ if (vfs_statfs(&acct->file->f_path, &sbuf))
goto out;
- }
if (acct->active) {
- if (act < 0) {
+ u64 suspend = sbuf.f_blocks * SUSPEND;
+ do_div(suspend, 100);
+ if (sbuf.f_bavail <= suspend) {
acct->active = 0;
printk(KERN_INFO "Process accounting paused\n");
}
} else {
- if (act > 0) {
+ u64 resume = sbuf.f_blocks * RESUME;
+ do_div(resume, 100);
+ if (sbuf.f_bavail >= resume) {
acct->active = 1;
printk(KERN_INFO "Process accounting resumed\n");
}
}
acct->needcheck = jiffies + ACCT_TIMEOUT*HZ;
- res = acct->active;
out:
- spin_unlock(&acct_lock);
- return res;
+ return acct->active;
}
static void acct_put(struct bsd_acct_struct *p)
@@ -550,7 +522,7 @@ static void do_acct_process(struct bsd_acct_struct *acct)
* First check to see if there is enough free_space to continue
* the process accounting system.
*/
- if (!check_free_space(acct, file))
+ if (!check_free_space(acct))
goto out;
fill_ac(&ac);