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Merge branch 'hotfixes' of git://git.linux-nfs.org/projects/trondmy/n…
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…fs-2.6

* 'hotfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  NFS: nfs_updatepage(): don't mark page as dirty if an error occurred
  NFS: Fix filehandle size comparisons in the mount code
  NFS: Reduce the NFS mount code stack usage.
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@torvalds
torvalds committed Jun 23, 2008
2 parents 27f4837 + 03fa9e8 commit 62786b9
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Showing 3 changed files with 51 additions and 37 deletions.
5 changes: 3 additions & 2 deletions fs/nfs/mount_clnt.c
View file
Expand Up @@ -130,10 +130,11 @@ static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
struct mnt_fhstatus *res)
{
struct nfs_fh *fh = res->fh;
unsigned size;

if ((res->status = ntohl(*p++)) == 0) {
int size = ntohl(*p++);
if (size <= NFS3_FHSIZE) {
size = ntohl(*p++);
if (size <= NFS3_FHSIZE && size != 0) {
fh->size = size;
memcpy(fh->data, p, size);
} else
Expand Down
76 changes: 44 additions & 32 deletions fs/nfs/super.c
View file
Expand Up @@ -1216,8 +1216,6 @@ static int nfs_validate_mount_data(void *options,
{
struct nfs_mount_data *data = (struct nfs_mount_data *)options;

memset(args, 0, sizeof(*args));

if (data == NULL)
goto out_no_data;

Expand Down Expand Up @@ -1251,13 +1249,13 @@ static int nfs_validate_mount_data(void *options,
case 5:
memset(data->context, 0, sizeof(data->context));
case 6:
if (data->flags & NFS_MOUNT_VER3)
if (data->flags & NFS_MOUNT_VER3) {
if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
goto out_invalid_fh;
mntfh->size = data->root.size;
else
} else
mntfh->size = NFS2_FHSIZE;

if (mntfh->size > sizeof(mntfh->data))
goto out_invalid_fh;

memcpy(mntfh->data, data->root.data, mntfh->size);
if (mntfh->size < sizeof(mntfh->data))
Expand Down Expand Up @@ -1585,24 +1583,29 @@ static int nfs_get_sb(struct file_system_type *fs_type,
{
struct nfs_server *server = NULL;
struct super_block *s;
struct nfs_fh mntfh;
struct nfs_parsed_mount_data data;
struct nfs_parsed_mount_data *data;
struct nfs_fh *mntfh;
struct dentry *mntroot;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
};
int error;
int error = -ENOMEM;

data = kzalloc(sizeof(*data), GFP_KERNEL);
mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
if (data == NULL || mntfh == NULL)
goto out_free_fh;

security_init_mnt_opts(&data.lsm_opts);
security_init_mnt_opts(&data->lsm_opts);

/* Validate the mount data */
error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
if (error < 0)
goto out;

/* Get a volume representation */
server = nfs_create_server(&data, &mntfh);
server = nfs_create_server(data, mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out;
Expand Down Expand Up @@ -1630,16 +1633,16 @@ static int nfs_get_sb(struct file_system_type *fs_type,

if (!s->s_root) {
/* initial superblock/root creation */
nfs_fill_super(s, &data);
nfs_fill_super(s, data);
}

mntroot = nfs_get_root(s, &mntfh);
mntroot = nfs_get_root(s, mntfh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}

error = security_sb_set_mnt_opts(s, &data.lsm_opts);
error = security_sb_set_mnt_opts(s, &data->lsm_opts);
if (error)
goto error_splat_root;

Expand All @@ -1649,9 +1652,12 @@ static int nfs_get_sb(struct file_system_type *fs_type,
error = 0;

out:
kfree(data.nfs_server.hostname);
kfree(data.mount_server.hostname);
security_free_mnt_opts(&data.lsm_opts);
kfree(data->nfs_server.hostname);
kfree(data->mount_server.hostname);
security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
kfree(mntfh);
kfree(data);
return error;

out_err_nosb:
Expand Down Expand Up @@ -1800,8 +1806,6 @@ static int nfs4_validate_mount_data(void *options,
struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
char *c;

memset(args, 0, sizeof(*args));

if (data == NULL)
goto out_no_data;

Expand Down Expand Up @@ -1959,26 +1963,31 @@ static int nfs4_validate_mount_data(void *options,
static int nfs4_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
{
struct nfs_parsed_mount_data data;
struct nfs_parsed_mount_data *data;
struct super_block *s;
struct nfs_server *server;
struct nfs_fh mntfh;
struct nfs_fh *mntfh;
struct dentry *mntroot;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
};
int error;
int error = -ENOMEM;

security_init_mnt_opts(&data.lsm_opts);
data = kzalloc(sizeof(*data), GFP_KERNEL);
mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
if (data == NULL || mntfh == NULL)
goto out_free_fh;

security_init_mnt_opts(&data->lsm_opts);

/* Validate the mount data */
error = nfs4_validate_mount_data(raw_data, &data, dev_name);
error = nfs4_validate_mount_data(raw_data, data, dev_name);
if (error < 0)
goto out;

/* Get a volume representation */
server = nfs4_create_server(&data, &mntfh);
server = nfs4_create_server(data, mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out;
Expand Down Expand Up @@ -2009,13 +2018,13 @@ static int nfs4_get_sb(struct file_system_type *fs_type,
nfs4_fill_super(s);
}

mntroot = nfs4_get_root(s, &mntfh);
mntroot = nfs4_get_root(s, mntfh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}

error = security_sb_set_mnt_opts(s, &data.lsm_opts);
error = security_sb_set_mnt_opts(s, &data->lsm_opts);
if (error)
goto error_splat_root;

Expand All @@ -2025,10 +2034,13 @@ static int nfs4_get_sb(struct file_system_type *fs_type,
error = 0;

out:
kfree(data.client_address);
kfree(data.nfs_server.export_path);
kfree(data.nfs_server.hostname);
security_free_mnt_opts(&data.lsm_opts);
kfree(data->client_address);
kfree(data->nfs_server.export_path);
kfree(data->nfs_server.hostname);
security_free_mnt_opts(&data->lsm_opts);
out_free_fh:
kfree(mntfh);
kfree(data);
return error;

out_free:
Expand Down
7 changes: 4 additions & 3 deletions fs/nfs/write.c
View file
Expand Up @@ -739,12 +739,13 @@ int nfs_updatepage(struct file *file, struct page *page,
}

status = nfs_writepage_setup(ctx, page, offset, count);
__set_page_dirty_nobuffers(page);
if (status < 0)
nfs_set_pageerror(page);
else
__set_page_dirty_nobuffers(page);

dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n",
status, (long long)i_size_read(inode));
if (status < 0)
nfs_set_pageerror(page);
return status;
}

Expand Down

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