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root/fs/nfs/nfs3acl.c

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DEFINITIONS

This source file includes following definitions.
  1. nfs3_listxattr
  2. nfs3_getxattr
  3. nfs3_setxattr
  4. nfs3_removexattr
  5. __nfs3_forget_cached_acls
  6. nfs3_forget_cached_acls
  7. nfs3_get_cached_acl
  8. nfs3_cache_acls
  9. nfs3_proc_getacl
  10. nfs3_proc_setacls
  11. nfs3_proc_setacl
  12. nfs3_proc_set_default_acl

#include <linux/fs.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/posix_acl_xattr.h>
#include <linux/nfsacl.h>

#include "internal.h"

#define NFSDBG_FACILITY NFSDBG_PROC

ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
        struct inode *inode = dentry->d_inode;
        struct posix_acl *acl;
        int pos=0, len=0;

#       define output(s) do {                                           \
                        if (pos + sizeof(s) <= size) {                  \
                                memcpy(buffer + pos, s, sizeof(s));     \
                                pos += sizeof(s);                       \
                        }                                               \
                        len += sizeof(s);                               \
                } while(0)

        acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS);
        if (IS_ERR(acl))
                return PTR_ERR(acl);
        if (acl) {
                output("system.posix_acl_access");
                posix_acl_release(acl);
        }

        if (S_ISDIR(inode->i_mode)) {
                acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT);
                if (IS_ERR(acl))
                        return PTR_ERR(acl);
                if (acl) {
                        output("system.posix_acl_default");
                        posix_acl_release(acl);
                }
        }

#       undef output

        if (!buffer || len <= size)
                return len;
        return -ERANGE;
}

ssize_t nfs3_getxattr(struct dentry *dentry, const char *name,
                void *buffer, size_t size)
{
        struct inode *inode = dentry->d_inode;
        struct posix_acl *acl;
        int type, error = 0;

        if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
                type = ACL_TYPE_ACCESS;
        else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
                type = ACL_TYPE_DEFAULT;
        else
                return -EOPNOTSUPP;

        acl = nfs3_proc_getacl(inode, type);
        if (IS_ERR(acl))
                return PTR_ERR(acl);
        else if (acl) {
                if (type == ACL_TYPE_ACCESS && acl->a_count == 0)
                        error = -ENODATA;
                else
                        error = posix_acl_to_xattr(acl, buffer, size);
                posix_acl_release(acl);
        } else
                error = -ENODATA;

        return error;
}

int nfs3_setxattr(struct dentry *dentry, const char *name,
             const void *value, size_t size, int flags)
{
        struct inode *inode = dentry->d_inode;
        struct posix_acl *acl;
        int type, error;

        if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
                type = ACL_TYPE_ACCESS;
        else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
                type = ACL_TYPE_DEFAULT;
        else
                return -EOPNOTSUPP;

        acl = posix_acl_from_xattr(value, size);
        if (IS_ERR(acl))
                return PTR_ERR(acl);
        error = nfs3_proc_setacl(inode, type, acl);
        posix_acl_release(acl);

        return error;
}

int nfs3_removexattr(struct dentry *dentry, const char *name)
{
        struct inode *inode = dentry->d_inode;
        int type;

        if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
                type = ACL_TYPE_ACCESS;
        else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
                type = ACL_TYPE_DEFAULT;
        else
                return -EOPNOTSUPP;

        return nfs3_proc_setacl(inode, type, NULL);
}

static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi)
{
        if (!IS_ERR(nfsi->acl_access)) {
                posix_acl_release(nfsi->acl_access);
                nfsi->acl_access = ERR_PTR(-EAGAIN);
        }
        if (!IS_ERR(nfsi->acl_default)) {
                posix_acl_release(nfsi->acl_default);
                nfsi->acl_default = ERR_PTR(-EAGAIN);
        }
}

void nfs3_forget_cached_acls(struct inode *inode)
{
        dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id,
                inode->i_ino);
        spin_lock(&inode->i_lock);
        __nfs3_forget_cached_acls(NFS_I(inode));
        spin_unlock(&inode->i_lock);
}

static struct posix_acl *nfs3_get_cached_acl(struct inode *inode, int type)
{
        struct nfs_inode *nfsi = NFS_I(inode);
        struct posix_acl *acl = ERR_PTR(-EINVAL);

        spin_lock(&inode->i_lock);
        switch(type) {
                case ACL_TYPE_ACCESS:
                        acl = nfsi->acl_access;
                        break;

                case ACL_TYPE_DEFAULT:
                        acl = nfsi->acl_default;
                        break;

                default:
                        goto out;
        }
        if (IS_ERR(acl))
                acl = ERR_PTR(-EAGAIN);
        else
                acl = posix_acl_dup(acl);
out:
        spin_unlock(&inode->i_lock);
        dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id,
                inode->i_ino, type, acl);
        return acl;
}

static void nfs3_cache_acls(struct inode *inode, struct posix_acl *acl,
                    struct posix_acl *dfacl)
{
        struct nfs_inode *nfsi = NFS_I(inode);

        dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id,
                inode->i_ino, acl, dfacl);
        spin_lock(&inode->i_lock);
        __nfs3_forget_cached_acls(NFS_I(inode));
        if (!IS_ERR(acl))
                nfsi->acl_access = posix_acl_dup(acl);
        if (!IS_ERR(dfacl))
                nfsi->acl_default = posix_acl_dup(dfacl);
        spin_unlock(&inode->i_lock);
}

struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
{
        struct nfs_server *server = NFS_SERVER(inode);
        struct nfs_fattr fattr;
        struct page *pages[NFSACL_MAXPAGES] = { };
        struct nfs3_getaclargs args = {
                .fh = NFS_FH(inode),
                /* The xdr layer may allocate pages here. */
                .pages = pages,
        };
        struct nfs3_getaclres res = {
                .fattr =        &fattr,
        };
        struct rpc_message msg = {
                .rpc_argp       = &args,
                .rpc_resp       = &res,
        };
        struct posix_acl *acl;
        int status, count;

        if (!nfs_server_capable(inode, NFS_CAP_ACLS))
                return ERR_PTR(-EOPNOTSUPP);

        status = nfs_revalidate_inode(server, inode);
        if (status < 0)
                return ERR_PTR(status);
        if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
                nfs_zap_acl_cache(inode);
        acl = nfs3_get_cached_acl(inode, type);
        if (acl != ERR_PTR(-EAGAIN))
                return acl;
        acl = NULL;

        /*
         * Only get the access acl when explicitly requested: We don't
         * need it for access decisions, and only some applications use
         * it. Applications which request the access acl first are not
         * penalized from this optimization.
         */
        if (type == ACL_TYPE_ACCESS)
                args.mask |= NFS_ACLCNT|NFS_ACL;
        if (S_ISDIR(inode->i_mode))
                args.mask |= NFS_DFACLCNT|NFS_DFACL;
        if (args.mask == 0)
                return NULL;

        dprintk("NFS call getacl\n");
        msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
        status = rpc_call_sync(server->client_acl, &msg, 0);
        dprintk("NFS reply getacl: %d\n", status);

        /* pages may have been allocated at the xdr layer. */
        for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
                __free_page(args.pages[count]);

        switch (status) {
                case 0:
                        status = nfs_refresh_inode(inode, &fattr);
                        break;
                case -EPFNOSUPPORT:
                case -EPROTONOSUPPORT:
                        dprintk("NFS_V3_ACL extension not supported; disabling\n");
                        server->caps &= ~NFS_CAP_ACLS;
                case -ENOTSUPP:
                        status = -EOPNOTSUPP;
                default:
                        goto getout;
        }
        if ((args.mask & res.mask) != args.mask) {
                status = -EIO;
                goto getout;
        }

        if (res.acl_access != NULL) {
                if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) {
                        posix_acl_release(res.acl_access);
                        res.acl_access = NULL;
                }
        }
        nfs3_cache_acls(inode,
                (res.mask & NFS_ACL)   ? res.acl_access  : ERR_PTR(-EINVAL),
                (res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL));

        switch(type) {
                case ACL_TYPE_ACCESS:
                        acl = res.acl_access;
                        res.acl_access = NULL;
                        break;

                case ACL_TYPE_DEFAULT:
                        acl = res.acl_default;
                        res.acl_default = NULL;
        }

getout:
        posix_acl_release(res.acl_access);
        posix_acl_release(res.acl_default);

        if (status != 0) {
                posix_acl_release(acl);
                acl = ERR_PTR(status);
        }
        return acl;
}

static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
                  struct posix_acl *dfacl)
{
        struct nfs_server *server = NFS_SERVER(inode);
        struct nfs_fattr fattr;
        struct page *pages[NFSACL_MAXPAGES] = { };
        struct nfs3_setaclargs args = {
                .inode = inode,
                .mask = NFS_ACL,
                .acl_access = acl,
                .pages = pages,
        };
        struct rpc_message msg = {
                .rpc_argp       = &args,
                .rpc_resp       = &fattr,
        };
        int status, count;

        status = -EOPNOTSUPP;
        if (!nfs_server_capable(inode, NFS_CAP_ACLS))
                goto out;

        /* We are doing this here, because XDR marshalling can only
           return -ENOMEM. */
        status = -ENOSPC;
        if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
                goto out;
        if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
                goto out;
        if (S_ISDIR(inode->i_mode)) {
                args.mask |= NFS_DFACL;
                args.acl_default = dfacl;
        }

        dprintk("NFS call setacl\n");
        msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
        status = rpc_call_sync(server->client_acl, &msg, 0);
        nfs_access_zap_cache(inode);
        nfs_zap_acl_cache(inode);
        dprintk("NFS reply setacl: %d\n", status);

        /* pages may have been allocated at the xdr layer. */
        for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
                __free_page(args.pages[count]);

        switch (status) {
                case 0:
                        status = nfs_refresh_inode(inode, &fattr);
                        nfs3_cache_acls(inode, acl, dfacl);
                        break;
                case -EPFNOSUPPORT:
                case -EPROTONOSUPPORT:
                        dprintk("NFS_V3_ACL SETACL RPC not supported"
                                        "(will not retry)\n");
                        server->caps &= ~NFS_CAP_ACLS;
                case -ENOTSUPP:
                        status = -EOPNOTSUPP;
        }
out:
        return status;
}

int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl)
{
        struct posix_acl *alloc = NULL, *dfacl = NULL;
        int status;

        if (S_ISDIR(inode->i_mode)) {
                switch(type) {
                        case ACL_TYPE_ACCESS:
                                alloc = dfacl = nfs3_proc_getacl(inode,
                                                ACL_TYPE_DEFAULT);
                                if (IS_ERR(alloc))
                                        goto fail;
                                break;

                        case ACL_TYPE_DEFAULT:
                                dfacl = acl;
                                alloc = acl = nfs3_proc_getacl(inode,
                                                ACL_TYPE_ACCESS);
                                if (IS_ERR(alloc))
                                        goto fail;
                                break;

                        default:
                                return -EINVAL;
                }
        } else if (type != ACL_TYPE_ACCESS)
                        return -EINVAL;

        if (acl == NULL) {
                alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
                if (IS_ERR(alloc))
                        goto fail;
        }
        status = nfs3_proc_setacls(inode, acl, dfacl);
        posix_acl_release(alloc);
        return status;

fail:
        return PTR_ERR(alloc);
}

int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
                mode_t mode)
{
        struct posix_acl *dfacl, *acl;
        int error = 0;

        dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT);
        if (IS_ERR(dfacl)) {
                error = PTR_ERR(dfacl);
                return (error == -EOPNOTSUPP) ? 0 : error;
        }
        if (!dfacl)
                return 0;
        acl = posix_acl_clone(dfacl, GFP_KERNEL);
        error = -ENOMEM;
        if (!acl)
                goto out_release_dfacl;
        error = posix_acl_create_masq(acl, &mode);
        if (error < 0)
                goto out_release_acl;
        error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ?
                                                      dfacl : NULL);
out_release_acl:
        posix_acl_release(acl);
out_release_dfacl:
        posix_acl_release(dfacl);
        return error;
}

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