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fs/9p: track open fids

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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>
This commit is contained in:
Greg Kurz
2020-09-23 22:11:44 +08:00
committed by Dominique Martinet
parent 154372e67d
commit 987a648509
7 changed files with 35 additions and 10 deletions
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6
fs/9p/vfs_inode.c
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@ -256,6 +256,7 @@ int v9fs_init_inode(struct v9fs_session_info *v9ses,
inode->i_rdev = rdev;
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
inode->i_mapping->a_ops = &v9fs_addr_operations;
inode->i_private = NULL;
switch (mode & S_IFMT) {
case S_IFIFO:
@ -796,6 +797,7 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
struct v9fs_session_info *v9ses;
struct p9_fid *fid, *inode_fid;
struct dentry *res = NULL;
struct inode *inode;
if (d_in_lookup(dentry)) {
res = v9fs_vfs_lookup(dir, dentry, 0);
@ -824,7 +826,8 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
}
v9fs_invalidate_inode_attr(dir);
v9inode = V9FS_I(d_inode(dentry));
inode = d_inode(dentry);
v9inode = V9FS_I(inode);
mutex_lock(&v9inode->v_mutex);
if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
!v9inode->writeback_fid &&
@ -852,6 +855,7 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
file->private_data = fid;
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
v9fs_cache_inode_set_cookie(d_inode(dentry), file);
v9fs_open_fid_add(inode, fid);
file->f_mode |= FMODE_CREATED;
out: