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| author | Ronnie Sahlberg <lsahlber@redhat.com> | 2021-03-09 09:07:31 +1000 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2021-04-25 16:28:23 -0500 |
| commit | 5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9 (patch) | |
| tree | e0882caf0f8bf52942dcfcbf9e671d41d82d97c6 /fs/cifs | |
| parent | 269f67e1ffead61777b1b0cf2ea0f61d06f8c56d (diff) | |
| download | linux-5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9.tar.gz linux-5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9.tar.bz2 linux-5e9c89d43fa6f5d458d4d0f9e22a67cc001c8da9.zip | |
cifs: Grab a reference for the dentry of the cached directory during the lifetime of the cache
We need to hold both a reference for the root/superblock as well as the directory that we
are caching. We need to drop these references before we call kill_anon_sb().
At this point, the root and the cached dentries are always the same but this will change
once we start caching other directories as well.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/cifsfs.c | 17 | ||||
| -rw-r--r-- | fs/cifs/cifsglob.h | 1 | ||||
| -rw-r--r-- | fs/cifs/smb2ops.c | 9 |
3 files changed, 27 insertions, 0 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index cf8eceb1d5a5..4257f841ec4e 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -257,11 +257,28 @@ out_no_root: static void cifs_kill_sb(struct super_block *sb) { struct cifs_sb_info *cifs_sb = CIFS_SB(sb); + struct cifs_tcon *tcon; + struct cached_fid *cfid; + /* + * We ned to release all dentries for the cached directories + * before we kill the sb. + */ if (cifs_sb->root) { dput(cifs_sb->root); cifs_sb->root = NULL; } + tcon = cifs_sb_master_tcon(cifs_sb); + if (tcon) { + cfid = &tcon->crfid; + mutex_lock(&cfid->fid_mutex); + if (cfid->dentry) { + + dput(cfid->dentry); + cfid->dentry = NULL; + } + mutex_unlock(&cfid->fid_mutex); + } kill_anon_super(sb); cifs_umount(cifs_sb); diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 034b919f091d..64a1095d7cfd 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -992,6 +992,7 @@ struct cached_fid { struct cifs_fid *fid; struct mutex fid_mutex; struct cifs_tcon *tcon; + struct dentry *dentry; struct work_struct lease_break; struct smb2_file_all_info file_all_info; }; diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 3ff460035705..5864ef600ee9 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -690,6 +690,10 @@ smb2_close_cached_fid(struct kref *ref) cfid->is_valid = false; cfid->file_all_info_is_valid = false; cfid->has_lease = false; + if (cfid->dentry) { + dput(cfid->dentry); + cfid->dentry = NULL; + } } } @@ -747,6 +751,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon, __le16 utf16_path = 0; /* Null - since an open of top of share */ u8 oplock = SMB2_OPLOCK_LEVEL_II; struct cifs_fid *pfid; + struct dentry *dentry; if (tcon->nohandlecache) return -ENOTSUPP; @@ -757,6 +762,8 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon, if (strlen(path)) return -ENOENT; + dentry = cifs_sb->root; + mutex_lock(&tcon->crfid.fid_mutex); if (tcon->crfid.is_valid) { cifs_dbg(FYI, "found a cached root file handle\n"); @@ -881,6 +888,8 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon, memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid)); tcon->crfid.tcon = tcon; tcon->crfid.is_valid = true; + tcon->crfid.dentry = dentry; + dget(dentry); kref_init(&tcon->crfid.refcount); /* BB TBD check to see if oplock level check can be removed below */ |