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authorAhmed S. Darwish <a.darwish@linutronix.de>2020-07-20 17:55:24 +0200
committerPeter Zijlstra <peterz@infradead.org>2020-07-29 16:14:27 +0200
commit26475371976c69489d3a8e6c8bbf35afbbc25055 (patch)
tree5f7ac08bbe80ab13cd56cd4dcf0cdf4d6829d061 /fs/fs_struct.c
parenttimekeeping: Use sequence counter with associated raw spinlock (diff)
downloadlinux-26475371976c69489d3a8e6c8bbf35afbbc25055.tar.xz
linux-26475371976c69489d3a8e6c8bbf35afbbc25055.zip
vfs: Use sequence counter with associated spinlock
A sequence counter write side critical section must be protected by some form of locking to serialize writers. A plain seqcount_t does not contain the information of which lock must be held when entering a write side critical section. Use the new seqcount_spinlock_t data type, which allows to associate a spinlock with the sequence counter. This enables lockdep to verify that the spinlock used for writer serialization is held when the write side critical section is entered. If lockdep is disabled this lock association is compiled out and has neither storage size nor runtime overhead. Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200720155530.1173732-19-a.darwish@linutronix.de
Diffstat (limited to 'fs/fs_struct.c')
-rw-r--r--fs/fs_struct.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/fs_struct.c b/fs/fs_struct.c
index ca639ed967b7..04b3f5b9c629 100644
--- a/fs/fs_struct.c
+++ b/fs/fs_struct.c
@@ -117,7 +117,7 @@ struct fs_struct *copy_fs_struct(struct fs_struct *old)
fs->users = 1;
fs->in_exec = 0;
spin_lock_init(&fs->lock);
- seqcount_init(&fs->seq);
+ seqcount_spinlock_init(&fs->seq, &fs->lock);
fs->umask = old->umask;
spin_lock(&old->lock);
@@ -163,6 +163,6 @@ EXPORT_SYMBOL(current_umask);
struct fs_struct init_fs = {
.users = 1,
.lock = __SPIN_LOCK_UNLOCKED(init_fs.lock),
- .seq = SEQCNT_ZERO(init_fs.seq),
+ .seq = SEQCNT_SPINLOCK_ZERO(init_fs.seq, &init_fs.lock),
.umask = 0022,
};