return err;
switch (err) {
case -NFS4ERR_RESOURCE:
+ case -NFS4ERR_LAYOUTTRYLATER:
+ case -NFS4ERR_RECALLCONFLICT:
return -EREMOTEIO;
case -NFS4ERR_WRONGSEC:
return -EPERM;
return -EPROTONOSUPPORT;
case -NFS4ERR_ACCESS:
return -EACCES;
+ case -NFS4ERR_FILE_OPEN:
+ return -EBUSY;
default:
dprintk("%s could not handle NFSv4 error %d\n",
__func__, -err);
}
if (state == NULL)
break;
- nfs4_schedule_stateid_recovery(server, state);
+ ret = nfs4_schedule_stateid_recovery(server, state);
+ if (ret < 0)
+ break;
goto wait_on_recovery;
case -NFS4ERR_DELEG_REVOKED:
case -NFS4ERR_ADMIN_REVOKED:
if (state == NULL)
break;
nfs_remove_bad_delegation(state->inode);
- nfs4_schedule_stateid_recovery(server, state);
+ ret = nfs4_schedule_stateid_recovery(server, state);
+ if (ret < 0)
+ break;
goto wait_on_recovery;
case -NFS4ERR_EXPIRED:
- if (state != NULL)
- nfs4_schedule_stateid_recovery(server, state);
+ if (state != NULL) {
+ ret = nfs4_schedule_stateid_recovery(server, state);
+ if (ret < 0)
+ break;
+ }
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_STALE_CLIENTID:
nfs4_schedule_lease_recovery(clp);
int cancelled;
};
+static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
+ int err, struct nfs4_exception *exception)
+{
+ if (err != -EINVAL)
+ return false;
+ if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
+ return false;
+ server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
+ exception->retry = 1;
+ return true;
+}
+
+static enum open_claim_type4
+nfs4_map_atomic_open_claim(struct nfs_server *server,
+ enum open_claim_type4 claim)
+{
+ if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
+ return claim;
+ switch (claim) {
+ default:
+ return claim;
+ case NFS4_OPEN_CLAIM_FH:
+ return NFS4_OPEN_CLAIM_NULL;
+ case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
+ return NFS4_OPEN_CLAIM_DELEGATE_CUR;
+ case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
+ return NFS4_OPEN_CLAIM_DELEGATE_PREV;
+ }
+}
static void nfs4_init_opendata_res(struct nfs4_opendata *p)
{
static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
struct nfs4_state_owner *sp, fmode_t fmode, int flags,
const struct iattr *attrs,
+ enum open_claim_type4 claim,
gfp_t gfp_mask)
{
struct dentry *parent = dget_parent(dentry);
p->dir = parent;
p->owner = sp;
atomic_inc(&sp->so_count);
- p->o_arg.fh = NFS_FH(dir);
p->o_arg.open_flags = flags;
p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
/* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
p->o_arg.server = server;
p->o_arg.bitmask = server->attr_bitmask;
p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
- p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
+ p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
+ switch (p->o_arg.claim) {
+ case NFS4_OPEN_CLAIM_NULL:
+ case NFS4_OPEN_CLAIM_DELEGATE_CUR:
+ case NFS4_OPEN_CLAIM_DELEGATE_PREV:
+ p->o_arg.fh = NFS_FH(dir);
+ break;
+ case NFS4_OPEN_CLAIM_PREVIOUS:
+ case NFS4_OPEN_CLAIM_FH:
+ case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
+ case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
+ p->o_arg.fh = NFS_FH(dentry->d_inode);
+ }
if (attrs != NULL && attrs->ia_valid != 0) {
__be32 verf[2];
data->o_arg.fmode);
iput(inode);
out:
+ nfs_release_seqid(data->o_arg.seqid);
return state;
err_put_inode:
iput(inode);
return ERR_PTR(-ENOENT);
}
-static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
+static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
+ struct nfs4_state *state, enum open_claim_type4 claim)
{
struct nfs4_opendata *opendata;
- opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
+ opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
+ NULL, claim, GFP_NOFS);
if (opendata == NULL)
return ERR_PTR(-ENOMEM);
opendata->state = state;
fmode_t delegation_type = 0;
int status;
- opendata = nfs4_open_recoverdata_alloc(ctx, state);
+ opendata = nfs4_open_recoverdata_alloc(ctx, state,
+ NFS4_OPEN_CLAIM_PREVIOUS);
if (IS_ERR(opendata))
return PTR_ERR(opendata);
- opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
- opendata->o_arg.fh = NFS_FH(state->inode);
rcu_read_lock();
delegation = rcu_dereference(NFS_I(state->inode)->delegation);
if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
int err;
do {
err = _nfs4_do_open_reclaim(ctx, state);
+ if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
+ continue;
if (err != -NFS4ERR_DELAY)
break;
nfs4_handle_exception(server, err, &exception);
ctx = nfs4_state_find_open_context(state);
if (IS_ERR(ctx))
- return PTR_ERR(ctx);
+ return -EAGAIN;
ret = nfs4_do_open_reclaim(ctx, state);
put_nfs_open_context(ctx);
return ret;
struct nfs4_opendata *opendata;
int ret;
- opendata = nfs4_open_recoverdata_alloc(ctx, state);
+ opendata = nfs4_open_recoverdata_alloc(ctx, state,
+ NFS4_OPEN_CLAIM_DELEG_CUR_FH);
if (IS_ERR(opendata))
return PTR_ERR(opendata);
- opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
ret = nfs4_open_recover(opendata, state);
nfs4_opendata_put(opendata);
struct nfs4_opendata *opendata;
int ret;
- opendata = nfs4_open_recoverdata_alloc(ctx, state);
+ opendata = nfs4_open_recoverdata_alloc(ctx, state,
+ NFS4_OPEN_CLAIM_FH);
if (IS_ERR(opendata))
return PTR_ERR(opendata);
ret = nfs4_open_recover(opendata, state);
do {
err = _nfs4_open_expired(ctx, state);
+ if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
+ continue;
switch (err) {
default:
goto out;
ctx = nfs4_state_find_open_context(state);
if (IS_ERR(ctx))
- return PTR_ERR(ctx);
+ return -EAGAIN;
ret = nfs4_do_open_expired(ctx, state);
put_nfs_open_context(ctx);
return ret;
if (ret != 0)
goto out;
- if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
+ if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
nfs4_schedule_stateid_recovery(server, state);
- nfs4_wait_clnt_recover(server->nfs_client);
- }
*res = state;
out:
return ret;
struct nfs4_state *state = NULL;
struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_opendata *opendata;
+ enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
int status;
/* Protect against reboot recovery conflicts */
if (dentry->d_inode != NULL)
nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
status = -ENOMEM;
- opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
+ if (dentry->d_inode)
+ claim = NFS4_OPEN_CLAIM_FH;
+ opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
+ claim, GFP_KERNEL);
if (opendata == NULL)
goto err_put_state_owner;
struct rpc_cred *cred,
struct nfs4_threshold **ctx_th)
{
+ struct nfs_server *server = NFS_SERVER(dir);
struct nfs4_exception exception = { };
struct nfs4_state *res;
int status;
exception.retry = 1;
continue;
}
- res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
+ if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
+ continue;
+ res = ERR_PTR(nfs4_handle_exception(server,
status, &exception));
} while (exception.retry);
return res;
nfs_fattr_init(fattr);
- if (state != NULL) {
+ if (state != NULL && nfs4_valid_open_stateid(state)) {
struct nfs_lockowner lockowner = {
.l_owner = current->files,
.l_pid = current->tgid,
calldata->arg.fmode &= ~FMODE_WRITE;
}
}
+ if (!nfs4_valid_open_stateid(state))
+ call_close = 0;
spin_unlock(&state->owner->so_lock);
if (!call_close) {
auth = rpcauth_create(flavor, server->client);
if (IS_ERR(auth)) {
- ret = -EIO;
+ ret = -EACCES;
goto out;
}
ret = nfs4_lookup_root(server, fhandle, info);
return status;
}
-/*
- * get the file handle for the "/" directory on the server
+static int nfs4_do_find_root_sec(struct nfs_server *server,
+ struct nfs_fh *fhandle, struct nfs_fsinfo *info)
+{
+ int mv = server->nfs_client->cl_minorversion;
+ return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
+}
+
+/**
+ * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
+ * @server: initialized nfs_server handle
+ * @fhandle: we fill in the pseudo-fs root file handle
+ * @info: we fill in an FSINFO struct
+ *
+ * Returns zero on success, or a negative errno.
*/
int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
- int minor_version = server->nfs_client->cl_minorversion;
- int status = nfs4_lookup_root(server, fhandle, info);
- if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
- /*
- * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
- * by nfs4_map_errors() as this function exits.
- */
- status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
+ int status;
+
+ status = nfs4_lookup_root(server, fhandle, info);
+ if ((status == -NFS4ERR_WRONGSEC) &&
+ !(server->flags & NFS_MOUNT_SECFLAVOUR))
+ status = nfs4_do_find_root_sec(server, fhandle, info);
+
if (status == 0)
status = nfs4_server_capabilities(server, fhandle);
if (status == 0)
status = nfs4_do_fsinfo(server, fhandle, info);
+
return nfs4_map_errors(status);
}
int status;
if (pnfs_ld_layoutret_on_setattr(inode))
- pnfs_return_layout(inode);
+ pnfs_commit_and_return_layout(inode);
nfs_fattr_init(fattr);
static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
{
struct nfs4_exception exception = { };
+ unsigned long now = jiffies;
int err;
do {
- err = nfs4_handle_exception(server,
- _nfs4_do_fsinfo(server, fhandle, fsinfo),
- &exception);
+ err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
+ if (err == 0) {
+ struct nfs_client *clp = server->nfs_client;
+
+ spin_lock(&clp->cl_lock);
+ clp->cl_lease_time = fsinfo->lease_time * HZ;
+ clp->cl_last_renewal = now;
+ spin_unlock(&clp->cl_lock);
+ break;
+ }
+ err = nfs4_handle_exception(server, err, &exception);
} while (exception.retry);
return err;
}
return err;
}
+int nfs4_set_rw_stateid(nfs4_stateid *stateid,
+ const struct nfs_open_context *ctx,
+ const struct nfs_lock_context *l_ctx,
+ fmode_t fmode)
+{
+ const struct nfs_lockowner *lockowner = NULL;
+
+ if (l_ctx != NULL)
+ lockowner = &l_ctx->lockowner;
+ return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
+}
+EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
+
+static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
+ const struct nfs_open_context *ctx,
+ const struct nfs_lock_context *l_ctx,
+ fmode_t fmode)
+{
+ nfs4_stateid current_stateid;
+
+ if (nfs4_set_rw_stateid(¤t_stateid, ctx, l_ctx, fmode))
+ return false;
+ return nfs4_stateid_match(stateid, ¤t_stateid);
+}
+
+static bool nfs4_error_stateid_expired(int err)
+{
+ switch (err) {
+ case -NFS4ERR_DELEG_REVOKED:
+ case -NFS4ERR_ADMIN_REVOKED:
+ case -NFS4ERR_BAD_STATEID:
+ case -NFS4ERR_STALE_STATEID:
+ case -NFS4ERR_OLD_STATEID:
+ case -NFS4ERR_OPENMODE:
+ case -NFS4ERR_EXPIRED:
+ return true;
+ }
+ return false;
+}
+
void __nfs4_read_done_cb(struct nfs_read_data *data)
{
nfs_invalidate_atime(data->header->inode);
return 0;
}
+static bool nfs4_read_stateid_changed(struct rpc_task *task,
+ struct nfs_readargs *args)
+{
+
+ if (!nfs4_error_stateid_expired(task->tk_status) ||
+ nfs4_stateid_is_current(&args->stateid,
+ args->context,
+ args->lock_context,
+ FMODE_READ))
+ return false;
+ rpc_restart_call_prepare(task);
+ return true;
+}
+
static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
if (!nfs4_sequence_done(task, &data->res.seq_res))
return -EAGAIN;
-
+ if (nfs4_read_stateid_changed(task, &data->args))
+ return -EAGAIN;
return data->read_done_cb ? data->read_done_cb(task, data) :
nfs4_read_done_cb(task, data);
}
static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
{
- nfs4_setup_sequence(NFS_SERVER(data->header->inode),
+ if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
&data->args.seq_args,
&data->res.seq_res,
- task);
+ task))
+ return;
+ nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
+ data->args.lock_context, FMODE_READ);
}
static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
return 0;
}
+static bool nfs4_write_stateid_changed(struct rpc_task *task,
+ struct nfs_writeargs *args)
+{
+
+ if (!nfs4_error_stateid_expired(task->tk_status) ||
+ nfs4_stateid_is_current(&args->stateid,
+ args->context,
+ args->lock_context,
+ FMODE_WRITE))
+ return false;
+ rpc_restart_call_prepare(task);
+ return true;
+}
+
static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
{
if (!nfs4_sequence_done(task, &data->res.seq_res))
return -EAGAIN;
+ if (nfs4_write_stateid_changed(task, &data->args))
+ return -EAGAIN;
return data->write_done_cb ? data->write_done_cb(task, data) :
nfs4_write_done_cb(task, data);
}
static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
{
- nfs4_setup_sequence(NFS_SERVER(data->header->inode),
+ if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
&data->args.seq_args,
&data->res.seq_res,
- task);
+ task))
+ return;
+ nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
+ data->args.lock_context, FMODE_WRITE);
}
static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
case -NFS4ERR_OPENMODE:
if (state == NULL)
break;
- nfs4_schedule_stateid_recovery(server, state);
+ if (nfs4_schedule_stateid_recovery(server, state) < 0)
+ goto stateid_invalid;
goto wait_on_recovery;
case -NFS4ERR_EXPIRED:
- if (state != NULL)
- nfs4_schedule_stateid_recovery(server, state);
+ if (state != NULL) {
+ if (nfs4_schedule_stateid_recovery(server, state) < 0)
+ goto stateid_invalid;
+ }
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_STALE_CLIENTID:
nfs4_schedule_lease_recovery(clp);
}
task->tk_status = nfs4_map_errors(task->tk_status);
return 0;
+stateid_invalid:
+ task->tk_status = -EIO;
+ return 0;
wait_on_recovery:
rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
struct nfs4_setclientid_res *arg,
struct rpc_cred *cred)
{
- struct nfs_fsinfo fsinfo;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
.rpc_argp = arg,
- .rpc_resp = &fsinfo,
.rpc_cred = cred,
};
- unsigned long now;
int status;
dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
clp->cl_rpcclient->cl_auth->au_ops->au_name,
clp->cl_clientid);
- now = jiffies;
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
- if (status == 0) {
- spin_lock(&clp->cl_lock);
- clp->cl_lease_time = fsinfo.lease_time * HZ;
- clp->cl_last_renewal = now;
- spin_unlock(&clp->cl_lock);
- }
dprintk("NFS reply setclientid_confirm: %d\n", status);
return status;
}
data->res.open_seqid = data->arg.open_seqid;
} else
data->arg.new_lock_owner = 0;
+ if (!nfs4_valid_open_stateid(state)) {
+ data->rpc_status = -EBADF;
+ task->tk_action = NULL;
+ goto out_release_open_seqid;
+ }
data->timestamp = jiffies;
if (nfs4_setup_sequence(data->server,
&data->arg.seq_args,
&data->res.seq_res,
task) == 0)
return;
+out_release_open_seqid:
nfs_release_seqid(data->arg.open_seqid);
out_release_lock_seqid:
nfs_release_seqid(data->arg.lock_seqid);
struct nfs_server *server = NFS_SERVER(inode);
struct pnfs_layout_hdr *lo;
struct nfs4_state *state = NULL;
+ unsigned long timeo, giveup;
dprintk("--> %s\n", __func__);
goto out;
case -NFS4ERR_LAYOUTTRYLATER:
case -NFS4ERR_RECALLCONFLICT:
- task->tk_status = -NFS4ERR_DELAY;
+ timeo = rpc_get_timeout(task->tk_client);
+ giveup = lgp->args.timestamp + timeo;
+ if (time_after(giveup, jiffies))
+ task->tk_status = -NFS4ERR_DELAY;
break;
case -NFS4ERR_EXPIRED:
case -NFS4ERR_BAD_STATEID:
static void nfs4_layoutget_release(void *calldata)
{
struct nfs4_layoutget *lgp = calldata;
- struct nfs_server *server = NFS_SERVER(lgp->args.inode);
+ struct inode *inode = lgp->args.inode;
+ struct nfs_server *server = NFS_SERVER(inode);
size_t max_pages = max_response_pages(server);
dprintk("--> %s\n", __func__);
nfs4_free_pages(lgp->args.layout.pages, max_pages);
+ pnfs_put_layout_hdr(NFS_I(inode)->layout);
put_nfs_open_context(lgp->args.ctx);
kfree(calldata);
dprintk("<-- %s\n", __func__);
struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
{
- struct nfs_server *server = NFS_SERVER(lgp->args.inode);
+ struct inode *inode = lgp->args.inode;
+ struct nfs_server *server = NFS_SERVER(inode);
size_t max_pages = max_response_pages(server);
struct rpc_task *task;
struct rpc_message msg = {
return ERR_PTR(-ENOMEM);
}
lgp->args.layout.pglen = max_pages * PAGE_SIZE;
+ lgp->args.timestamp = jiffies;
lgp->res.layoutp = &lgp->args.layout;
lgp->res.seq_res.sr_slot = NULL;
nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
+
+ /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
+ pnfs_get_layout_hdr(NFS_I(inode)->layout);
+
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return ERR_CAST(task);
static void nfs4_layoutcommit_release(void *calldata)
{
struct nfs4_layoutcommit_data *data = calldata;
- struct pnfs_layout_segment *lseg, *tmp;
- unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
pnfs_cleanup_layoutcommit(data);
- /* Matched by references in pnfs_set_layoutcommit */
- list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
- list_del_init(&lseg->pls_lc_list);
- if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
- &lseg->pls_flags))
- pnfs_put_lseg(lseg);
- }
-
- clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
- smp_mb__after_clear_bit();
- wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
-
put_rpccred(data->cred);
kfree(data);
}
static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
.minor_version = 0,
+ .init_caps = NFS_CAP_READDIRPLUS
+ | NFS_CAP_ATOMIC_OPEN
+ | NFS_CAP_CHANGE_ATTR
+ | NFS_CAP_POSIX_LOCK,
.call_sync = _nfs4_call_sync,
.match_stateid = nfs4_match_stateid,
.find_root_sec = nfs4_find_root_sec,
#if defined(CONFIG_NFS_V4_1)
static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
.minor_version = 1,
+ .init_caps = NFS_CAP_READDIRPLUS
+ | NFS_CAP_ATOMIC_OPEN
+ | NFS_CAP_CHANGE_ATTR
+ | NFS_CAP_POSIX_LOCK
+ | NFS_CAP_STATEID_NFSV41
+ | NFS_CAP_ATOMIC_OPEN_V1,
.call_sync = nfs4_call_sync_sequence,
.match_stateid = nfs41_match_stateid,
.find_root_sec = nfs41_find_root_sec,
projects / deliverable / linux.git / blobdiff