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cifs: add lease tracking to the cached root fid

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Use a read lease for the cached root fid so that we can detect
when the content of the directory changes (via a break) at which time
we close the handle. On next access to the root the handle will be reopened
and cached again.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg
2018-06-14 06:48:35 +10:00
committed by Steve French
parent 2fbb56446f
commit a93864d939
6 changed files with 58 additions and 20 deletions
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34
fs/cifs/smb2ops.c
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@@ -323,6 +323,21 @@ SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
}
#endif /* STATS2 */
void
smb2_cached_lease_break(struct work_struct *work)
{
struct cached_fid *cfid = container_of(work,
struct cached_fid, lease_break);
mutex_lock(&cfid->fid_mutex);
if (cfid->is_valid) {
cifs_dbg(FYI, "clear cached root file handle\n");
SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
cfid->fid->volatile_fid);
cfid->is_valid = false;
}
mutex_unlock(&cfid->fid_mutex);
}
/*
* Open the directory at the root of a share
*/
@@ -331,13 +346,13 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
struct cifs_open_parms oparams;
int rc;
__le16 srch_path = 0; /* Null - since an open of top of share */
u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
u8 oplock = SMB2_OPLOCK_LEVEL_II;
mutex_lock(&tcon->prfid_mutex);
if (tcon->valid_root_fid) {
mutex_lock(&tcon->crfid.fid_mutex);
if (tcon->crfid.is_valid) {
cifs_dbg(FYI, "found a cached root file handle\n");
memcpy(pfid, tcon->prfid, sizeof(struct cifs_fid));
mutex_unlock(&tcon->prfid_mutex);
memcpy(pfid, tcon->crfid.fid, sizeof(struct cifs_fid));
mutex_unlock(&tcon->crfid.fid_mutex);
return 0;
}
@@ -350,10 +365,11 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
rc = SMB2_open(xid, &oparams, &srch_path, &oplock, NULL, NULL, NULL);
if (rc == 0) {
memcpy(tcon->prfid, pfid, sizeof(struct cifs_fid));
tcon->valid_root_fid = true;
memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
tcon->crfid.tcon = tcon;
tcon->crfid.is_valid = true;
}
mutex_unlock(&tcon->prfid_mutex);
mutex_unlock(&tcon->crfid.fid_mutex);
return rc;
}
@@ -436,7 +452,7 @@ smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_open_parms oparms;
struct cifs_fid fid;
if ((*full_path == 0) && tcon->valid_root_fid)
if ((*full_path == 0) && tcon->crfid.is_valid)
return 0;
utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);