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-rw-r--r--fs/nfsd/export.c125
-rw-r--r--fs/nfsd/nfs4recover.c50
-rw-r--r--fs/nfsd/nfs4state.c8
-rw-r--r--fs/nfsd/nfsctl.c8
-rw-r--r--fs/nfsd/vfs.c126
5 files changed, 201 insertions, 116 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 5cd882b8871..5839b229cd0 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -163,18 +163,16 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
if (!ek)
err = -ENOMEM;
} else {
- struct nameidata nd;
- err = path_lookup(buf, 0, &nd);
+ err = kern_path(buf, 0, &key.ek_path);
if (err)
goto out;
dprintk("Found the path %s\n", buf);
- key.ek_path = nd.path;
ek = svc_expkey_update(&key, ek);
if (!ek)
err = -ENOMEM;
- path_put(&nd.path);
+ path_put(&key.ek_path);
}
cache_flush();
out:
@@ -501,35 +499,22 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
int len;
int err;
struct auth_domain *dom = NULL;
- struct nameidata nd;
- struct svc_export exp, *expp;
+ struct svc_export exp = {}, *expp;
int an_int;
- nd.path.dentry = NULL;
- exp.ex_pathname = NULL;
-
- /* fs locations */
- exp.ex_fslocs.locations = NULL;
- exp.ex_fslocs.locations_count = 0;
- exp.ex_fslocs.migrated = 0;
-
- exp.ex_uuid = NULL;
-
- /* secinfo */
- exp.ex_nflavors = 0;
-
if (mesg[mlen-1] != '\n')
return -EINVAL;
mesg[mlen-1] = 0;
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
- err = -ENOMEM;
- if (!buf) goto out;
+ if (!buf)
+ return -ENOMEM;
/* client */
- len = qword_get(&mesg, buf, PAGE_SIZE);
err = -EINVAL;
- if (len <= 0) goto out;
+ len = qword_get(&mesg, buf, PAGE_SIZE);
+ if (len <= 0)
+ goto out;
err = -ENOENT;
dom = auth_domain_find(buf);
@@ -538,25 +523,25 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
/* path */
err = -EINVAL;
- if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
- goto out;
- err = path_lookup(buf, 0, &nd);
- if (err) goto out_no_path;
+ if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
+ goto out1;
+
+ err = kern_path(buf, 0, &exp.ex_path);
+ if (err)
+ goto out1;
- exp.h.flags = 0;
exp.ex_client = dom;
- exp.ex_path.mnt = nd.path.mnt;
- exp.ex_path.dentry = nd.path.dentry;
- exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
+
err = -ENOMEM;
+ exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
if (!exp.ex_pathname)
- goto out;
+ goto out2;
/* expiry */
err = -EINVAL;
exp.h.expiry_time = get_expiry(&mesg);
if (exp.h.expiry_time == 0)
- goto out;
+ goto out3;
/* flags */
err = get_int(&mesg, &an_int);
@@ -564,22 +549,26 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
err = 0;
set_bit(CACHE_NEGATIVE, &exp.h.flags);
} else {
- if (err || an_int < 0) goto out;
+ if (err || an_int < 0)
+ goto out3;
exp.ex_flags= an_int;
/* anon uid */
err = get_int(&mesg, &an_int);
- if (err) goto out;
+ if (err)
+ goto out3;
exp.ex_anon_uid= an_int;
/* anon gid */
err = get_int(&mesg, &an_int);
- if (err) goto out;
+ if (err)
+ goto out3;
exp.ex_anon_gid= an_int;
/* fsid */
err = get_int(&mesg, &an_int);
- if (err) goto out;
+ if (err)
+ goto out3;
exp.ex_fsid = an_int;
while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
@@ -605,12 +594,13 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
*/
break;
if (err)
- goto out;
+ goto out4;
}
- err = check_export(nd.path.dentry->d_inode, exp.ex_flags,
+ err = check_export(exp.ex_path.dentry->d_inode, exp.ex_flags,
exp.ex_uuid);
- if (err) goto out;
+ if (err)
+ goto out4;
}
expp = svc_export_lookup(&exp);
@@ -623,15 +613,16 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
err = -ENOMEM;
else
exp_put(expp);
- out:
+out4:
nfsd4_fslocs_free(&exp.ex_fslocs);
kfree(exp.ex_uuid);
+out3:
kfree(exp.ex_pathname);
- if (nd.path.dentry)
- path_put(&nd.path);
- out_no_path:
- if (dom)
- auth_domain_put(dom);
+out2:
+ path_put(&exp.ex_path);
+out1:
+ auth_domain_put(dom);
+out:
kfree(buf);
return err;
}
@@ -999,7 +990,7 @@ exp_export(struct nfsctl_export *nxp)
struct svc_export *exp = NULL;
struct svc_export new;
struct svc_expkey *fsid_key = NULL;
- struct nameidata nd;
+ struct path path;
int err;
/* Consistency check */
@@ -1022,12 +1013,12 @@ exp_export(struct nfsctl_export *nxp)
/* Look up the dentry */
- err = path_lookup(nxp->ex_path, 0, &nd);
+ err = kern_path(nxp->ex_path, 0, &path);
if (err)
goto out_put_clp;
err = -EINVAL;
- exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL);
+ exp = exp_get_by_name(clp, path.mnt, path.dentry, NULL);
memset(&new, 0, sizeof(new));
@@ -1035,8 +1026,8 @@ exp_export(struct nfsctl_export *nxp)
if ((nxp->ex_flags & NFSEXP_FSID) &&
(!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
fsid_key->ek_path.mnt &&
- (fsid_key->ek_path.mnt != nd.path.mnt ||
- fsid_key->ek_path.dentry != nd.path.dentry))
+ (fsid_key->ek_path.mnt != path.mnt ||
+ fsid_key->ek_path.dentry != path.dentry))
goto finish;
if (!IS_ERR(exp)) {
@@ -1052,7 +1043,7 @@ exp_export(struct nfsctl_export *nxp)
goto finish;
}
- err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL);
+ err = check_export(path.dentry->d_inode, nxp->ex_flags, NULL);
if (err) goto finish;
err = -ENOMEM;
@@ -1065,7 +1056,7 @@ exp_export(struct nfsctl_export *nxp)
if (!new.ex_pathname)
goto finish;
new.ex_client = clp;
- new.ex_path = nd.path;
+ new.ex_path = path;
new.ex_flags = nxp->ex_flags;
new.ex_anon_uid = nxp->ex_anon_uid;
new.ex_anon_gid = nxp->ex_anon_gid;
@@ -1091,7 +1082,7 @@ finish:
exp_put(exp);
if (fsid_key && !IS_ERR(fsid_key))
cache_put(&fsid_key->h, &svc_expkey_cache);
- path_put(&nd.path);
+ path_put(&path);
out_put_clp:
auth_domain_put(clp);
out_unlock:
@@ -1122,7 +1113,7 @@ exp_unexport(struct nfsctl_export *nxp)
{
struct auth_domain *dom;
svc_export *exp;
- struct nameidata nd;
+ struct path path;
int err;
/* Consistency check */
@@ -1139,13 +1130,13 @@ exp_unexport(struct nfsctl_export *nxp)
goto out_unlock;
}
- err = path_lookup(nxp->ex_path, 0, &nd);
+ err = kern_path(nxp->ex_path, 0, &path);
if (err)
goto out_domain;
err = -EINVAL;
- exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL);
- path_put(&nd.path);
+ exp = exp_get_by_name(dom, path.mnt, path.dentry, NULL);
+ path_put(&path);
if (IS_ERR(exp))
goto out_domain;
@@ -1167,26 +1158,26 @@ out_unlock:
* since its harder to fool a kernel module than a user space program.
*/
int
-exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
+exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
{
struct svc_export *exp;
- struct nameidata nd;
+ struct path path;
struct inode *inode;
struct svc_fh fh;
int err;
err = -EPERM;
/* NB: we probably ought to check that it's NUL-terminated */
- if (path_lookup(path, 0, &nd)) {
- printk("nfsd: exp_rootfh path not found %s", path);
+ if (kern_path(name, 0, &path)) {
+ printk("nfsd: exp_rootfh path not found %s", name);
return err;
}
- inode = nd.path.dentry->d_inode;
+ inode = path.dentry->d_inode;
dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
- path, nd.path.dentry, clp->name,
+ name, path.dentry, clp->name,
inode->i_sb->s_id, inode->i_ino);
- exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL);
+ exp = exp_parent(clp, path.mnt, path.dentry, NULL);
if (IS_ERR(exp)) {
err = PTR_ERR(exp);
goto out;
@@ -1196,7 +1187,7 @@ exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
* fh must be initialized before calling fh_compose
*/
fh_init(&fh, maxsize);
- if (fh_compose(&fh, exp, nd.path.dentry, NULL))
+ if (fh_compose(&fh, exp, path.dentry, NULL))
err = -EINVAL;
else
err = 0;
@@ -1204,7 +1195,7 @@ exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
fh_put(&fh);
exp_put(exp);
out:
- path_put(&nd.path);
+ path_put(&path);
return err;
}
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 145b3c877a2..bb93946ace2 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -51,7 +51,7 @@
#define NFSDDBG_FACILITY NFSDDBG_PROC
/* Globals */
-static struct nameidata rec_dir;
+static struct path rec_dir;
static int rec_dir_init = 0;
static void
@@ -121,9 +121,9 @@ out_no_tfm:
static void
nfsd4_sync_rec_dir(void)
{
- mutex_lock(&rec_dir.path.dentry->d_inode->i_mutex);
- nfsd_sync_dir(rec_dir.path.dentry);
- mutex_unlock(&rec_dir.path.dentry->d_inode->i_mutex);
+ mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
+ nfsd_sync_dir(rec_dir.dentry);
+ mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
}
int
@@ -143,9 +143,9 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
nfs4_save_user(&uid, &gid);
/* lock the parent */
- mutex_lock(&rec_dir.path.dentry->d_inode->i_mutex);
+ mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
- dentry = lookup_one_len(dname, rec_dir.path.dentry, HEXDIR_LEN-1);
+ dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
if (IS_ERR(dentry)) {
status = PTR_ERR(dentry);
goto out_unlock;
@@ -155,15 +155,15 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
goto out_put;
}
- status = mnt_want_write(rec_dir.path.mnt);
+ status = mnt_want_write(rec_dir.mnt);
if (status)
goto out_put;
- status = vfs_mkdir(rec_dir.path.dentry->d_inode, dentry, S_IRWXU);
- mnt_drop_write(rec_dir.path.mnt);
+ status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
+ mnt_drop_write(rec_dir.mnt);
out_put:
dput(dentry);
out_unlock:
- mutex_unlock(&rec_dir.path.dentry->d_inode->i_mutex);
+ mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
if (status == 0) {
clp->cl_firststate = 1;
nfsd4_sync_rec_dir();
@@ -226,7 +226,7 @@ nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
nfs4_save_user(&uid, &gid);
- filp = dentry_open(dget(dir), mntget(rec_dir.path.mnt), O_RDONLY);
+ filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY);
status = PTR_ERR(filp);
if (IS_ERR(filp))
goto out;
@@ -291,9 +291,9 @@ nfsd4_unlink_clid_dir(char *name, int namlen)
dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
- mutex_lock(&rec_dir.path.dentry->d_inode->i_mutex);
- dentry = lookup_one_len(name, rec_dir.path.dentry, namlen);
- mutex_unlock(&rec_dir.path.dentry->d_inode->i_mutex);
+ mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
+ dentry = lookup_one_len(name, rec_dir.dentry, namlen);
+ mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
if (IS_ERR(dentry)) {
status = PTR_ERR(dentry);
return status;
@@ -302,7 +302,7 @@ nfsd4_unlink_clid_dir(char *name, int namlen)
if (!dentry->d_inode)
goto out;
- status = nfsd4_clear_clid_dir(rec_dir.path.dentry, dentry);
+ status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry);
out:
dput(dentry);
return status;
@@ -318,7 +318,7 @@ nfsd4_remove_clid_dir(struct nfs4_client *clp)
if (!rec_dir_init || !clp->cl_firststate)
return;
- status = mnt_want_write(rec_dir.path.mnt);
+ status = mnt_want_write(rec_dir.mnt);
if (status)
goto out;
clp->cl_firststate = 0;
@@ -327,7 +327,7 @@ nfsd4_remove_clid_dir(struct nfs4_client *clp)
nfs4_reset_user(uid, gid);
if (status == 0)
nfsd4_sync_rec_dir();
- mnt_drop_write(rec_dir.path.mnt);
+ mnt_drop_write(rec_dir.mnt);
out:
if (status)
printk("NFSD: Failed to remove expired client state directory"
@@ -357,17 +357,17 @@ nfsd4_recdir_purge_old(void) {
if (!rec_dir_init)
return;
- status = mnt_want_write(rec_dir.path.mnt);
+ status = mnt_want_write(rec_dir.mnt);
if (status)
goto out;
- status = nfsd4_list_rec_dir(rec_dir.path.dentry, purge_old);
+ status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
if (status == 0)
nfsd4_sync_rec_dir();
- mnt_drop_write(rec_dir.path.mnt);
+ mnt_drop_write(rec_dir.mnt);
out:
if (status)
printk("nfsd4: failed to purge old clients from recovery"
- " directory %s\n", rec_dir.path.dentry->d_name.name);
+ " directory %s\n", rec_dir.dentry->d_name.name);
}
static int
@@ -387,10 +387,10 @@ int
nfsd4_recdir_load(void) {
int status;
- status = nfsd4_list_rec_dir(rec_dir.path.dentry, load_recdir);
+ status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
if (status)
printk("nfsd4: failed loading clients from recovery"
- " directory %s\n", rec_dir.path.dentry->d_name.name);
+ " directory %s\n", rec_dir.dentry->d_name.name);
return status;
}
@@ -412,7 +412,7 @@ nfsd4_init_recdir(char *rec_dirname)
nfs4_save_user(&uid, &gid);
- status = path_lookup(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
+ status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
&rec_dir);
if (status)
printk("NFSD: unable to find recovery directory %s\n",
@@ -429,5 +429,5 @@ nfsd4_shutdown_recdir(void)
if (!rec_dir_init)
return;
rec_dir_init = 0;
- path_put(&rec_dir.path);
+ path_put(&rec_dir);
}
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 0cc7ff5d5ab..b0bebc552a1 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3284,17 +3284,17 @@ int
nfs4_reset_recoverydir(char *recdir)
{
int status;
- struct nameidata nd;
+ struct path path;
- status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
+ status = kern_path(recdir, LOOKUP_FOLLOW, &path);
if (status)
return status;
status = -ENOTDIR;
- if (S_ISDIR(nd.path.dentry->d_inode->i_mode)) {
+ if (S_ISDIR(path.dentry->d_inode->i_mode)) {
nfs4_set_recdir(recdir);
status = 0;
}
- path_put(&nd.path);
+ path_put(&path);
return status;
}
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 97543df5824..e3f9783fdcf 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -341,7 +341,7 @@ static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
{
- struct nameidata nd;
+ struct path path;
char *fo_path;
int error;
@@ -356,13 +356,13 @@ static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
if (qword_get(&buf, fo_path, size) < 0)
return -EINVAL;
- error = path_lookup(fo_path, 0, &nd);
+ error = kern_path(fo_path, 0, &path);
if (error)
return error;
- error = nlmsvc_unlock_all_by_sb(nd.path.mnt->mnt_sb);
+ error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
- path_put(&nd.path);
+ path_put(&path);
return error;
}
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 9609eb51d72..0bc56f6d927 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1818,6 +1818,115 @@ out:
}
/*
+ * We do this buffering because we must not call back into the file
+ * system's ->lookup() method from the filldir callback. That may well
+ * deadlock a number of file systems.
+ *
+ * This is based heavily on the implementation of same in XFS.
+ */
+struct buffered_dirent {
+ u64 ino;
+ loff_t offset;
+ int namlen;
+ unsigned int d_type;
+ char name[];
+};
+
+struct readdir_data {
+ char *dirent;
+ size_t used;
+ int full;
+};
+
+static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
+ loff_t offset, u64 ino, unsigned int d_type)
+{
+ struct readdir_data *buf = __buf;
+ struct buffered_dirent *de = (void *)(buf->dirent + buf->used);
+ unsigned int reclen;
+
+ reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
+ if (buf->used + reclen > PAGE_SIZE) {
+ buf->full = 1;
+ return -EINVAL;
+ }
+
+ de->namlen = namlen;
+ de->offset = offset;
+ de->ino = ino;
+ de->d_type = d_type;
+ memcpy(de->name, name, namlen);
+ buf->used += reclen;
+
+ return 0;
+}
+
+static int nfsd_buffered_readdir(struct file *file, filldir_t func,
+ struct readdir_cd *cdp, loff_t *offsetp)
+{
+ struct readdir_data buf;
+ struct buffered_dirent *de;
+ int host_err;
+ int size;
+ loff_t offset;
+
+ buf.dirent = (void *)__get_free_page(GFP_KERNEL);
+ if (!buf.dirent)
+ return -ENOMEM;
+
+ offset = *offsetp;
+ cdp->err = nfserr_eof; /* will be cleared on successful read */
+
+ while (1) {
+ unsigned int reclen;
+
+ buf.used = 0;
+ buf.full = 0;
+
+ host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf);
+ if (buf.full)
+ host_err = 0;
+
+ if (host_err < 0)
+ break;
+
+ size = buf.used;
+
+ if (!size)
+ break;
+
+ de = (struct buffered_dirent *)buf.dirent;
+ while (size > 0) {
+ offset = de->offset;
+
+ if (func(cdp, de->name, de->namlen, de->offset,
+ de->ino, de->d_type))
+ goto done;
+
+ if (cdp->err != nfs_ok)
+ goto done;
+
+ reclen = ALIGN(sizeof(*de) + de->namlen,
+ sizeof(u64));
+ size -= reclen;
+ de = (struct buffered_dirent *)((char *)de + reclen);
+ }
+ offset = vfs_llseek(file, 0, SEEK_CUR);
+ if (!buf.full)
+ break;
+ }
+
+ done:
+ free_page((unsigned long)(buf.dirent));
+
+ if (host_err)
+ return nfserrno(host_err);
+
+ *offsetp = offset;
+ return cdp->err;
+}
+
+/*
* Read entries from a directory.
* The NFSv3/4 verifier we ignore for now.
*/
@@ -1826,7 +1935,6 @@ nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
struct readdir_cd *cdp, filldir_t func)
{
__be32 err;
- int host_err;
struct file *file;
loff_t offset = *offsetp;
@@ -1840,21 +1948,7 @@ nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
goto out_close;
}
- /*
- * Read the directory entries. This silly loop is necessary because
- * readdir() is not guaranteed to fill up the entire buffer, but
- * may choose to do less.
- */
-
- do {
- cdp->err = nfserr_eof; /* will be cleared on successful read */
- host_err = vfs_readdir(file, func, cdp);
- } while (host_err >=0 && cdp->err == nfs_ok);
- if (host_err)
- err = nfserrno(host_err);
- else
- err = cdp->err;
- *offsetp = vfs_llseek(file, 0, 1);
+ err = nfsd_buffered_readdir(file, func, cdp, offsetp);
if (err == nfserr_eof || err == nfserr_toosmall)
err = nfs_ok; /* can still be found in ->err */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-23 04:05:19 +0000