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libfs: Add a lock class for the offset map's xa_lock 

Tie the dynamically-allocated xarray locks into a single class so
contention on the directory offset xarrays can be observed.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Message-Id: <169020933088.160441.9405180953116076087.stgit@manet.1015granger.net>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Chuck Lever 2023-07-24 10:43:57 -04:00 committed by Christian Brauner
parent a2e459555c
commit bbaef7973d
1 changed files with 3 additions and 0 deletions
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3
fs/libfs.c
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@ -249,6 +249,8 @@ static u32 dentry2offset(struct dentry *dentry)
return (u32)((uintptr_t)(dentry->d_fsdata));
}
static struct lock_class_key simple_offset_xa_lock;
/**
* simple_offset_init - initialize an offset_ctx
* @octx: directory offset map to be initialized
@ -257,6 +259,7 @@ static u32 dentry2offset(struct dentry *dentry)
void simple_offset_init(struct offset_ctx *octx)
{
xa_init_flags(&octx->xa, XA_FLAGS_ALLOC1);
lockdep_set_class(&octx->xa.xa_lock, &simple_offset_xa_lock);
/* 0 is '.', 1 is '..', so always start with offset 2 */
octx->next_offset = 2;