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Diffstat (limited to 'fs/xfs/linux-2.6/xfs_iops.c')
-rw-r--r--fs/xfs/linux-2.6/xfs_iops.c680
1 files changed, 680 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
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--- /dev/null
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -0,0 +1,680 @@
+/*
+ * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_alloc.h"
+#include "xfs_dmapi.h"
+#include "xfs_quota.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_bit.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_itable.h"
+#include "xfs_rw.h"
+#include "xfs_acl.h"
+#include "xfs_cap.h"
+#include "xfs_mac.h"
+#include "xfs_attr.h"
+#include "xfs_buf_item.h"
+#include "xfs_utils.h"
+
+#include <linux/xattr.h>
+#include <linux/namei.h>
+
+
+/*
+ * Pull the link count and size up from the xfs inode to the linux inode
+ */
+STATIC void
+validate_fields(
+ struct inode *ip)
+{
+ vnode_t *vp = LINVFS_GET_VP(ip);
+ vattr_t va;
+ int error;
+
+ va.va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS;
+ VOP_GETATTR(vp, &va, ATTR_LAZY, NULL, error);
+ if (likely(!error)) {
+ ip->i_nlink = va.va_nlink;
+ ip->i_blocks = va.va_nblocks;
+
+ /* we're under i_sem so i_size can't change under us */
+ if (i_size_read(ip) != va.va_size)
+ i_size_write(ip, va.va_size);
+ }
+}
+
+/*
+ * Determine whether a process has a valid fs_struct (kernel daemons
+ * like knfsd don't have an fs_struct).
+ *
+ * XXX(hch): nfsd is broken, better fix it instead.
+ */
+STATIC inline int
+has_fs_struct(struct task_struct *task)
+{
+ return (task->fs != init_task.fs);
+}
+
+STATIC int
+linvfs_mknod(
+ struct inode *dir,
+ struct dentry *dentry,
+ int mode,
+ dev_t rdev)
+{
+ struct inode *ip;
+ vattr_t va;
+ vnode_t *vp = NULL, *dvp = LINVFS_GET_VP(dir);
+ xfs_acl_t *default_acl = NULL;
+ attrexists_t test_default_acl = _ACL_DEFAULT_EXISTS;
+ int error;
+
+ /*
+ * Irix uses Missed'em'V split, but doesn't want to see
+ * the upper 5 bits of (14bit) major.
+ */
+ if (!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff)
+ return -EINVAL;
+
+ if (test_default_acl && test_default_acl(dvp)) {
+ if (!_ACL_ALLOC(default_acl))
+ return -ENOMEM;
+ if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
+ _ACL_FREE(default_acl);
+ default_acl = NULL;
+ }
+ }
+
+ if (IS_POSIXACL(dir) && !default_acl && has_fs_struct(current))
+ mode &= ~current->fs->umask;
+
+ memset(&va, 0, sizeof(va));
+ va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
+ va.va_type = IFTOVT(mode);
+ va.va_mode = mode;
+
+ switch (mode & S_IFMT) {
+ case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
+ va.va_rdev = sysv_encode_dev(rdev);
+ va.va_mask |= XFS_AT_RDEV;
+ /*FALLTHROUGH*/
+ case S_IFREG:
+ VOP_CREATE(dvp, dentry, &va, &vp, NULL, error);
+ break;
+ case S_IFDIR:
+ VOP_MKDIR(dvp, dentry, &va, &vp, NULL, error);
+ break;
+ default:
+ error = EINVAL;
+ break;
+ }
+
+ if (default_acl) {
+ if (!error) {
+ error = _ACL_INHERIT(vp, &va, default_acl);
+ if (!error) {
+ VMODIFY(vp);
+ } else {
+ struct dentry teardown = {};
+ int err2;
+
+ /* Oh, the horror.
+ * If we can't add the ACL we must back out.
+ * ENOSPC can hit here, among other things.
+ */
+ teardown.d_inode = ip = LINVFS_GET_IP(vp);
+ teardown.d_name = dentry->d_name;
+
+ vn_mark_bad(vp);
+
+ if (S_ISDIR(mode))
+ VOP_RMDIR(dvp, &teardown, NULL, err2);
+ else
+ VOP_REMOVE(dvp, &teardown, NULL, err2);
+ VN_RELE(vp);
+ }
+ }
+ _ACL_FREE(default_acl);
+ }
+
+ if (!error) {
+ ASSERT(vp);
+ ip = LINVFS_GET_IP(vp);
+
+ if (S_ISCHR(mode) || S_ISBLK(mode))
+ ip->i_rdev = rdev;
+ else if (S_ISDIR(mode))
+ validate_fields(ip);
+ d_instantiate(dentry, ip);
+ validate_fields(dir);
+ }
+ return -error;
+}
+
+STATIC int
+linvfs_create(
+ struct inode *dir,
+ struct dentry *dentry,
+ int mode,
+ struct nameidata *nd)
+{
+ return linvfs_mknod(dir, dentry, mode, 0);
+}
+
+STATIC int
+linvfs_mkdir(
+ struct inode *dir,
+ struct dentry *dentry,
+ int mode)
+{
+ return linvfs_mknod(dir, dentry, mode|S_IFDIR, 0);
+}
+
+STATIC struct dentry *
+linvfs_lookup(
+ struct inode *dir,
+ struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct vnode *vp = LINVFS_GET_VP(dir), *cvp;
+ int error;
+
+ if (dentry->d_name.len >= MAXNAMELEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
+ if (error) {
+ if (unlikely(error != ENOENT))
+ return ERR_PTR(-error);
+ d_add(dentry, NULL);
+ return NULL;
+ }
+
+ return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
+}
+
+STATIC int
+linvfs_link(
+ struct dentry *old_dentry,
+ struct inode *dir,
+ struct dentry *dentry)
+{
+ struct inode *ip; /* inode of guy being linked to */
+ vnode_t *tdvp; /* target directory for new name/link */
+ vnode_t *vp; /* vp of name being linked */
+ int error;
+
+ ip = old_dentry->d_inode; /* inode being linked to */
+ if (S_ISDIR(ip->i_mode))
+ return -EPERM;
+
+ tdvp = LINVFS_GET_VP(dir);
+ vp = LINVFS_GET_VP(ip);
+
+ VOP_LINK(tdvp, vp, dentry, NULL, error);
+ if (!error) {
+ VMODIFY(tdvp);
+ VN_HOLD(vp);
+ validate_fields(ip);
+ d_instantiate(dentry, ip);
+ }
+ return -error;
+}
+
+STATIC int
+linvfs_unlink(
+ struct inode *dir,
+ struct dentry *dentry)
+{
+ struct inode *inode;
+ vnode_t *dvp; /* directory containing name to remove */
+ int error;
+
+ inode = dentry->d_inode;
+ dvp = LINVFS_GET_VP(dir);
+
+ VOP_REMOVE(dvp, dentry, NULL, error);
+ if (!error) {
+ validate_fields(dir); /* For size only */
+ validate_fields(inode);
+ }
+
+ return -error;
+}
+
+STATIC int
+linvfs_symlink(
+ struct inode *dir,
+ struct dentry *dentry,
+ const char *symname)
+{
+ struct inode *ip;
+ vattr_t va;
+ vnode_t *dvp; /* directory containing name of symlink */
+ vnode_t *cvp; /* used to lookup symlink to put in dentry */
+ int error;
+
+ dvp = LINVFS_GET_VP(dir);
+ cvp = NULL;
+
+ memset(&va, 0, sizeof(va));
+ va.va_type = VLNK;
+ va.va_mode = irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO;
+ va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
+
+ error = 0;
+ VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
+ if (!error && cvp) {
+ ASSERT(cvp->v_type == VLNK);
+ ip = LINVFS_GET_IP(cvp);
+ d_instantiate(dentry, ip);
+ validate_fields(dir);
+ validate_fields(ip); /* size needs update */
+ }
+ return -error;
+}
+
+STATIC int
+linvfs_rmdir(
+ struct inode *dir,
+ struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ vnode_t *dvp = LINVFS_GET_VP(dir);
+ int error;
+
+ VOP_RMDIR(dvp, dentry, NULL, error);
+ if (!error) {
+ validate_fields(inode);
+ validate_fields(dir);
+ }
+ return -error;
+}
+
+STATIC int
+linvfs_rename(
+ struct inode *odir,
+ struct dentry *odentry,
+ struct inode *ndir,
+ struct dentry *ndentry)
+{
+ struct inode *new_inode = ndentry->d_inode;
+ vnode_t *fvp; /* from directory */
+ vnode_t *tvp; /* target directory */
+ int error;
+
+ fvp = LINVFS_GET_VP(odir);
+ tvp = LINVFS_GET_VP(ndir);
+
+ VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
+ if (error)
+ return -error;
+
+ if (new_inode)
+ validate_fields(new_inode);
+
+ validate_fields(odir);
+ if (ndir != odir)
+ validate_fields(ndir);
+ return 0;
+}
+
+/*
+ * careful here - this function can get called recursively, so
+ * we need to be very careful about how much stack we use.
+ * uio is kmalloced for this reason...
+ */
+STATIC int
+linvfs_follow_link(
+ struct dentry *dentry,
+ struct nameidata *nd)
+{
+ vnode_t *vp;
+ uio_t *uio;
+ iovec_t iov;
+ int error;
+ char *link;
+
+ ASSERT(dentry);
+ ASSERT(nd);
+
+ link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
+ if (!link) {
+ nd_set_link(nd, ERR_PTR(-ENOMEM));
+ return 0;
+ }
+
+ uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
+ if (!uio) {
+ kfree(link);
+ nd_set_link(nd, ERR_PTR(-ENOMEM));
+ return 0;
+ }
+
+ vp = LINVFS_GET_VP(dentry->d_inode);
+
+ iov.iov_base = link;
+ iov.iov_len = MAXNAMELEN;
+
+ uio->uio_iov = &iov;
+ uio->uio_offset = 0;
+ uio->uio_segflg = UIO_SYSSPACE;
+ uio->uio_resid = MAXNAMELEN;
+ uio->uio_iovcnt = 1;
+
+ VOP_READLINK(vp, uio, 0, NULL, error);
+ if (error) {
+ kfree(link);
+ link = ERR_PTR(-error);
+ } else {
+ link[MAXNAMELEN - uio->uio_resid] = '\0';
+ }
+ kfree(uio);
+
+ nd_set_link(nd, link);
+ return 0;
+}
+
+static void linvfs_put_link(struct dentry *dentry, struct nameidata *nd)
+{
+ char *s = nd_get_link(nd);
+ if (!IS_ERR(s))
+ kfree(s);
+}
+
+#ifdef CONFIG_XFS_POSIX_ACL
+STATIC int
+linvfs_permission(
+ struct inode *inode,
+ int mode,
+ struct nameidata *nd)
+{
+ vnode_t *vp = LINVFS_GET_VP(inode);
+ int error;
+
+ mode <<= 6; /* convert from linux to vnode access bits */
+ VOP_ACCESS(vp, mode, NULL, error);
+ return -error;
+}
+#else
+#define linvfs_permission NULL
+#endif
+
+STATIC int
+linvfs_getattr(
+ struct vfsmount *mnt,
+ struct dentry *dentry,
+ struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ vnode_t *vp = LINVFS_GET_VP(inode);
+ int error = 0;
+
+ if (unlikely(vp->v_flag & VMODIFIED))
+ error = vn_revalidate(vp);
+ if (!error)
+ generic_fillattr(inode, stat);
+ return 0;
+}
+
+STATIC int
+linvfs_setattr(
+ struct dentry *dentry,
+ struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ unsigned int ia_valid = attr->ia_valid;
+ vnode_t *vp = LINVFS_GET_VP(inode);
+ vattr_t vattr;
+ int flags = 0;
+ int error;
+
+ memset(&vattr, 0, sizeof(vattr_t));
+ if (ia_valid & ATTR_UID) {
+ vattr.va_mask |= XFS_AT_UID;
+ vattr.va_uid = attr->ia_uid;
+ }
+ if (ia_valid & ATTR_GID) {
+ vattr.va_mask |= XFS_AT_GID;
+ vattr.va_gid = attr->ia_gid;
+ }
+ if (ia_valid & ATTR_SIZE) {
+ vattr.va_mask |= XFS_AT_SIZE;
+ vattr.va_size = attr->ia_size;
+ }
+ if (ia_valid & ATTR_ATIME) {
+ vattr.va_mask |= XFS_AT_ATIME;
+ vattr.va_atime = attr->ia_atime;
+ }
+ if (ia_valid & ATTR_MTIME) {
+ vattr.va_mask |= XFS_AT_MTIME;
+ vattr.va_mtime = attr->ia_mtime;
+ }
+ if (ia_valid & ATTR_CTIME) {
+ vattr.va_mask |= XFS_AT_CTIME;
+ vattr.va_ctime = attr->ia_ctime;
+ }
+ if (ia_valid & ATTR_MODE) {
+ vattr.va_mask |= XFS_AT_MODE;
+ vattr.va_mode = attr->ia_mode;
+ if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
+ inode->i_mode &= ~S_ISGID;
+ }
+
+ if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET))
+ flags |= ATTR_UTIME;
+#ifdef ATTR_NO_BLOCK
+ if ((ia_valid & ATTR_NO_BLOCK))
+ flags |= ATTR_NONBLOCK;
+#endif
+
+ VOP_SETATTR(vp, &vattr, flags, NULL, error);
+ if (error)
+ return -error;
+ vn_revalidate(vp);
+ return error;
+}
+
+STATIC void
+linvfs_truncate(
+ struct inode *inode)
+{
+ block_truncate_page(inode->i_mapping, inode->i_size, linvfs_get_block);
+}
+
+STATIC int
+linvfs_setxattr(
+ struct dentry *dentry,
+ const char *name,
+ const void *data,
+ size_t size,
+ int flags)
+{
+ vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
+ char *attr = (char *)name;
+ attrnames_t *namesp;
+ int xflags = 0;
+ int error;
+
+ namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
+ if (!namesp)
+ return -EOPNOTSUPP;
+ attr += namesp->attr_namelen;
+ error = namesp->attr_capable(vp, NULL);
+ if (error)
+ return error;
+
+ /* Convert Linux syscall to XFS internal ATTR flags */
+ if (flags & XATTR_CREATE)
+ xflags |= ATTR_CREATE;
+ if (flags & XATTR_REPLACE)
+ xflags |= ATTR_REPLACE;
+ xflags |= namesp->attr_flag;
+ return namesp->attr_set(vp, attr, (void *)data, size, xflags);
+}
+
+STATIC ssize_t
+linvfs_getxattr(
+ struct dentry *dentry,
+ const char *name,
+ void *data,
+ size_t size)
+{
+ vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
+ char *attr = (char *)name;
+ attrnames_t *namesp;
+ int xflags = 0;
+ ssize_t error;
+
+ namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
+ if (!namesp)
+ return -EOPNOTSUPP;
+ attr += namesp->attr_namelen;
+ error = namesp->attr_capable(vp, NULL);
+ if (error)
+ return error;
+
+ /* Convert Linux syscall to XFS internal ATTR flags */
+ if (!size) {
+ xflags |= ATTR_KERNOVAL;
+ data = NULL;
+ }
+ xflags |= namesp->attr_flag;
+ return namesp->attr_get(vp, attr, (void *)data, size, xflags);
+}
+
+STATIC ssize_t
+linvfs_listxattr(
+ struct dentry *dentry,
+ char *data,
+ size_t size)
+{
+ vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
+ int error, xflags = ATTR_KERNAMELS;
+ ssize_t result;
+
+ if (!size)
+ xflags |= ATTR_KERNOVAL;
+ xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;
+
+ error = attr_generic_list(vp, data, size, xflags, &result);
+ if (error < 0)
+ return error;
+ return result;
+}
+
+STATIC int
+linvfs_removexattr(
+ struct dentry *dentry,
+ const char *name)
+{
+ vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
+ char *attr = (char *)name;
+ attrnames_t *namesp;
+ int xflags = 0;
+ int error;
+
+ namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
+ if (!namesp)
+ return -EOPNOTSUPP;
+ attr += namesp->attr_namelen;
+ error = namesp->attr_capable(vp, NULL);
+ if (error)
+ return error;
+ xflags |= namesp->attr_flag;
+ return namesp->attr_remove(vp, attr, xflags);
+}
+
+
+struct inode_operations linvfs_file_inode_operations = {
+ .permission = linvfs_permission,
+ .truncate = linvfs_truncate,
+ .getattr = linvfs_getattr,
+ .setattr = linvfs_setattr,
+ .setxattr = linvfs_setxattr,
+ .getxattr = linvfs_getxattr,
+ .listxattr = linvfs_listxattr,
+ .removexattr = linvfs_removexattr,
+};
+
+struct inode_operations linvfs_dir_inode_operations = {
+ .create = linvfs_create,
+ .lookup = linvfs_lookup,
+ .link = linvfs_link,
+ .unlink = linvfs_unlink,
+ .symlink = linvfs_symlink,
+ .mkdir = linvfs_mkdir,
+ .rmdir = linvfs_rmdir,
+ .mknod = linvfs_mknod,
+ .rename = linvfs_rename,
+ .permission = linvfs_permission,
+ .getattr = linvfs_getattr,
+ .setattr = linvfs_setattr,
+ .setxattr = linvfs_setxattr,
+ .getxattr = linvfs_getxattr,
+ .listxattr = linvfs_listxattr,
+ .removexattr = linvfs_removexattr,
+};
+
+struct inode_operations linvfs_symlink_inode_operations = {
+ .readlink = generic_readlink,
+ .follow_link = linvfs_follow_link,
+ .put_link = linvfs_put_link,
+ .permission = linvfs_permission,
+ .getattr = linvfs_getattr,
+ .setattr = linvfs_setattr,
+ .setxattr = linvfs_setxattr,
+ .getxattr = linvfs_getxattr,
+ .listxattr = linvfs_listxattr,
+ .removexattr = linvfs_removexattr,
+};
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