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| author | Greg Kurz <gkurz@linux.vnet.ibm.com> | 2020-09-23 17:11:44 +0300 |
|---|---|---|
| committer | Dominique Martinet <asmadeus@codewreck.org> | 2020-11-03 11:29:46 +0300 |
| commit | 987a64850996db22bbcf2c1d0a051446a343fa2c (patch) | |
| tree | 70596e685ff828cc5225956c3426d5f559eb5f28 /fs/9p/fid.c | |
| parent | 154372e67d4053e56591245eb413686621941333 (diff) | |
| download | linux-987a64850996db22bbcf2c1d0a051446a343fa2c.tar.xz | |
fs/9p: track open fids
This patch adds accounting of open fids in a list hanging off the i_private
field of the corresponding inode. This allows faster lookups compared to
searching the full 9p client list.
The lookup code is modified accordingly.
Link: http://lkml.kernel.org/r/20200923141146.90046-3-jianyong.wu@arm.com
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Jianyong Wu <jianyong.wu@arm.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Diffstat (limited to 'fs/9p/fid.c')
| -rw-r--r-- | fs/9p/fid.c | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/fs/9p/fid.c b/fs/9p/fid.c index 3304984c0fad..d11dd430590d 100644 --- a/fs/9p/fid.c +++ b/fs/9p/fid.c @@ -39,7 +39,7 @@ void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) } /** - * v9fs_fid_find_inode - search for a fid off of the client list + * v9fs_fid_find_inode - search for an open fid off of the inode list * @inode: return a fid pointing to a specific inode * @uid: return a fid belonging to the specified user * @@ -47,25 +47,39 @@ void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) static struct p9_fid *v9fs_fid_find_inode(struct inode *inode, kuid_t uid) { - struct p9_client *clnt = v9fs_inode2v9ses(inode)->clnt; - struct p9_fid *fid, *fidptr, *ret = NULL; - unsigned long flags; + struct hlist_head *h; + struct p9_fid *fid, *ret = NULL; p9_debug(P9_DEBUG_VFS, " inode: %p\n", inode); - spin_lock_irqsave(&clnt->lock, flags); - list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { - if (uid_eq(fid->uid, uid) && - (inode->i_ino == v9fs_qid2ino(&fid->qid))) { + spin_lock(&inode->i_lock); + h = (struct hlist_head *)&inode->i_private; + hlist_for_each_entry(fid, h, ilist) { + if (uid_eq(fid->uid, uid)) { ret = fid; break; } } - spin_unlock_irqrestore(&clnt->lock, flags); + spin_unlock(&inode->i_lock); return ret; } /** + * v9fs_open_fid_add - add an open fid to an inode + * @dentry: inode that the fid is being added to + * @fid: fid to add + * + */ + +void v9fs_open_fid_add(struct inode *inode, struct p9_fid *fid) +{ + spin_lock(&inode->i_lock); + hlist_add_head(&fid->ilist, (struct hlist_head *)&inode->i_private); + spin_unlock(&inode->i_lock); +} + + +/** * v9fs_fid_find - retrieve a fid that belongs to the specified uid * @dentry: dentry to look for fid in * @uid: return fid that belongs to the specified user |