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1320 lines
34 KiB
1320 lines
34 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Copyright (c) 2000-2005 Silicon Graphics, Inc. |
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* All Rights Reserved. |
|
*/ |
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#include "xfs.h" |
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#include "xfs_fs.h" |
|
#include "xfs_shared.h" |
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#include "xfs_format.h" |
|
#include "xfs_log_format.h" |
|
#include "xfs_trans_resv.h" |
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#include "xfs_mount.h" |
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#include "xfs_inode.h" |
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#include "xfs_acl.h" |
|
#include "xfs_quota.h" |
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#include "xfs_da_format.h" |
|
#include "xfs_da_btree.h" |
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#include "xfs_attr.h" |
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#include "xfs_trans.h" |
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#include "xfs_trace.h" |
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#include "xfs_icache.h" |
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#include "xfs_symlink.h" |
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#include "xfs_dir2.h" |
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#include "xfs_iomap.h" |
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#include "xfs_error.h" |
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#include "xfs_ioctl.h" |
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#include "xfs_xattr.h" |
|
|
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#include <linux/posix_acl.h> |
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#include <linux/security.h> |
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#include <linux/iversion.h> |
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#include <linux/fiemap.h> |
|
|
|
/* |
|
* Directories have different lock order w.r.t. mmap_lock compared to regular |
|
* files. This is due to readdir potentially triggering page faults on a user |
|
* buffer inside filldir(), and this happens with the ilock on the directory |
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* held. For regular files, the lock order is the other way around - the |
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* mmap_lock is taken during the page fault, and then we lock the ilock to do |
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* block mapping. Hence we need a different class for the directory ilock so |
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* that lockdep can tell them apart. |
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*/ |
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static struct lock_class_key xfs_nondir_ilock_class; |
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static struct lock_class_key xfs_dir_ilock_class; |
|
|
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static int |
|
xfs_initxattrs( |
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struct inode *inode, |
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const struct xattr *xattr_array, |
|
void *fs_info) |
|
{ |
|
const struct xattr *xattr; |
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struct xfs_inode *ip = XFS_I(inode); |
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int error = 0; |
|
|
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for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
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struct xfs_da_args args = { |
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.dp = ip, |
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.attr_filter = XFS_ATTR_SECURE, |
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.name = xattr->name, |
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.namelen = strlen(xattr->name), |
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.value = xattr->value, |
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.valuelen = xattr->value_len, |
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}; |
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error = xfs_attr_change(&args); |
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if (error < 0) |
|
break; |
|
} |
|
return error; |
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} |
|
|
|
/* |
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* Hook in SELinux. This is not quite correct yet, what we really need |
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* here (as we do for default ACLs) is a mechanism by which creation of |
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* these attrs can be journalled at inode creation time (along with the |
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* inode, of course, such that log replay can't cause these to be lost). |
|
*/ |
|
int |
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xfs_inode_init_security( |
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struct inode *inode, |
|
struct inode *dir, |
|
const struct qstr *qstr) |
|
{ |
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return security_inode_init_security(inode, dir, qstr, |
|
&xfs_initxattrs, NULL); |
|
} |
|
|
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static void |
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xfs_dentry_to_name( |
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struct xfs_name *namep, |
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struct dentry *dentry) |
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{ |
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namep->name = dentry->d_name.name; |
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namep->len = dentry->d_name.len; |
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namep->type = XFS_DIR3_FT_UNKNOWN; |
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} |
|
|
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static int |
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xfs_dentry_mode_to_name( |
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struct xfs_name *namep, |
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struct dentry *dentry, |
|
int mode) |
|
{ |
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namep->name = dentry->d_name.name; |
|
namep->len = dentry->d_name.len; |
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namep->type = xfs_mode_to_ftype(mode); |
|
|
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if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN)) |
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return -EFSCORRUPTED; |
|
|
|
return 0; |
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} |
|
|
|
STATIC void |
|
xfs_cleanup_inode( |
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struct inode *dir, |
|
struct inode *inode, |
|
struct dentry *dentry) |
|
{ |
|
struct xfs_name teardown; |
|
|
|
/* Oh, the horror. |
|
* If we can't add the ACL or we fail in |
|
* xfs_inode_init_security we must back out. |
|
* ENOSPC can hit here, among other things. |
|
*/ |
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xfs_dentry_to_name(&teardown, dentry); |
|
|
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xfs_remove(XFS_I(dir), &teardown, XFS_I(inode)); |
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} |
|
|
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/* |
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* Check to see if we are likely to need an extended attribute to be added to |
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* the inode we are about to allocate. This allows the attribute fork to be |
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* created during the inode allocation, reducing the number of transactions we |
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* need to do in this fast path. |
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* |
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* The security checks are optimistic, but not guaranteed. The two LSMs that |
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* require xattrs to be added here (selinux and smack) are also the only two |
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* LSMs that add a sb->s_security structure to the superblock. Hence if security |
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* is enabled and sb->s_security is set, we have a pretty good idea that we are |
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* going to be asked to add a security xattr immediately after allocating the |
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* xfs inode and instantiating the VFS inode. |
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*/ |
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static inline bool |
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xfs_create_need_xattr( |
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struct inode *dir, |
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struct posix_acl *default_acl, |
|
struct posix_acl *acl) |
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{ |
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if (acl) |
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return true; |
|
if (default_acl) |
|
return true; |
|
#if IS_ENABLED(CONFIG_SECURITY) |
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if (dir->i_sb->s_security) |
|
return true; |
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#endif |
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return false; |
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} |
|
|
|
|
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STATIC int |
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xfs_generic_create( |
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struct user_namespace *mnt_userns, |
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struct inode *dir, |
|
struct dentry *dentry, |
|
umode_t mode, |
|
dev_t rdev, |
|
bool tmpfile) /* unnamed file */ |
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{ |
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struct inode *inode; |
|
struct xfs_inode *ip = NULL; |
|
struct posix_acl *default_acl, *acl; |
|
struct xfs_name name; |
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int error; |
|
|
|
/* |
|
* Irix uses Missed'em'V split, but doesn't want to see |
|
* the upper 5 bits of (14bit) major. |
|
*/ |
|
if (S_ISCHR(mode) || S_ISBLK(mode)) { |
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if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff)) |
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return -EINVAL; |
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} else { |
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rdev = 0; |
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} |
|
|
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error = posix_acl_create(dir, &mode, &default_acl, &acl); |
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if (error) |
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return error; |
|
|
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/* Verify mode is valid also for tmpfile case */ |
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error = xfs_dentry_mode_to_name(&name, dentry, mode); |
|
if (unlikely(error)) |
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goto out_free_acl; |
|
|
|
if (!tmpfile) { |
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error = xfs_create(mnt_userns, XFS_I(dir), &name, mode, rdev, |
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xfs_create_need_xattr(dir, default_acl, acl), |
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&ip); |
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} else { |
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error = xfs_create_tmpfile(mnt_userns, XFS_I(dir), mode, &ip); |
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} |
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if (unlikely(error)) |
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goto out_free_acl; |
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|
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inode = VFS_I(ip); |
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|
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error = xfs_inode_init_security(inode, dir, &dentry->d_name); |
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if (unlikely(error)) |
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goto out_cleanup_inode; |
|
|
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if (default_acl) { |
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error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); |
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if (error) |
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goto out_cleanup_inode; |
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} |
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if (acl) { |
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error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS); |
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if (error) |
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goto out_cleanup_inode; |
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} |
|
|
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xfs_setup_iops(ip); |
|
|
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if (tmpfile) { |
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/* |
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* The VFS requires that any inode fed to d_tmpfile must have |
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* nlink == 1 so that it can decrement the nlink in d_tmpfile. |
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* However, we created the temp file with nlink == 0 because |
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* we're not allowed to put an inode with nlink > 0 on the |
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* unlinked list. Therefore we have to set nlink to 1 so that |
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* d_tmpfile can immediately set it back to zero. |
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*/ |
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set_nlink(inode, 1); |
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d_tmpfile(dentry, inode); |
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} else |
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d_instantiate(dentry, inode); |
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|
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xfs_finish_inode_setup(ip); |
|
|
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out_free_acl: |
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posix_acl_release(default_acl); |
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posix_acl_release(acl); |
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return error; |
|
|
|
out_cleanup_inode: |
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xfs_finish_inode_setup(ip); |
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if (!tmpfile) |
|
xfs_cleanup_inode(dir, inode, dentry); |
|
xfs_irele(ip); |
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goto out_free_acl; |
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} |
|
|
|
STATIC int |
|
xfs_vn_mknod( |
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struct user_namespace *mnt_userns, |
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struct inode *dir, |
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struct dentry *dentry, |
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umode_t mode, |
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dev_t rdev) |
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{ |
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return xfs_generic_create(mnt_userns, dir, dentry, mode, rdev, false); |
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} |
|
|
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STATIC int |
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xfs_vn_create( |
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struct user_namespace *mnt_userns, |
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struct inode *dir, |
|
struct dentry *dentry, |
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umode_t mode, |
|
bool flags) |
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{ |
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return xfs_generic_create(mnt_userns, dir, dentry, mode, 0, false); |
|
} |
|
|
|
STATIC int |
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xfs_vn_mkdir( |
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struct user_namespace *mnt_userns, |
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struct inode *dir, |
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struct dentry *dentry, |
|
umode_t mode) |
|
{ |
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return xfs_generic_create(mnt_userns, dir, dentry, mode | S_IFDIR, 0, |
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false); |
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} |
|
|
|
STATIC struct dentry * |
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xfs_vn_lookup( |
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struct inode *dir, |
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struct dentry *dentry, |
|
unsigned int flags) |
|
{ |
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struct inode *inode; |
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struct xfs_inode *cip; |
|
struct xfs_name name; |
|
int error; |
|
|
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if (dentry->d_name.len >= MAXNAMELEN) |
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return ERR_PTR(-ENAMETOOLONG); |
|
|
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xfs_dentry_to_name(&name, dentry); |
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error = xfs_lookup(XFS_I(dir), &name, &cip, NULL); |
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if (likely(!error)) |
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inode = VFS_I(cip); |
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else if (likely(error == -ENOENT)) |
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inode = NULL; |
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else |
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inode = ERR_PTR(error); |
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return d_splice_alias(inode, dentry); |
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} |
|
|
|
STATIC struct dentry * |
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xfs_vn_ci_lookup( |
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struct inode *dir, |
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struct dentry *dentry, |
|
unsigned int flags) |
|
{ |
|
struct xfs_inode *ip; |
|
struct xfs_name xname; |
|
struct xfs_name ci_name; |
|
struct qstr dname; |
|
int error; |
|
|
|
if (dentry->d_name.len >= MAXNAMELEN) |
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return ERR_PTR(-ENAMETOOLONG); |
|
|
|
xfs_dentry_to_name(&xname, dentry); |
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error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name); |
|
if (unlikely(error)) { |
|
if (unlikely(error != -ENOENT)) |
|
return ERR_PTR(error); |
|
/* |
|
* call d_add(dentry, NULL) here when d_drop_negative_children |
|
* is called in xfs_vn_mknod (ie. allow negative dentries |
|
* with CI filesystems). |
|
*/ |
|
return NULL; |
|
} |
|
|
|
/* if exact match, just splice and exit */ |
|
if (!ci_name.name) |
|
return d_splice_alias(VFS_I(ip), dentry); |
|
|
|
/* else case-insensitive match... */ |
|
dname.name = ci_name.name; |
|
dname.len = ci_name.len; |
|
dentry = d_add_ci(dentry, VFS_I(ip), &dname); |
|
kmem_free(ci_name.name); |
|
return dentry; |
|
} |
|
|
|
STATIC int |
|
xfs_vn_link( |
|
struct dentry *old_dentry, |
|
struct inode *dir, |
|
struct dentry *dentry) |
|
{ |
|
struct inode *inode = d_inode(old_dentry); |
|
struct xfs_name name; |
|
int error; |
|
|
|
error = xfs_dentry_mode_to_name(&name, dentry, inode->i_mode); |
|
if (unlikely(error)) |
|
return error; |
|
|
|
error = xfs_link(XFS_I(dir), XFS_I(inode), &name); |
|
if (unlikely(error)) |
|
return error; |
|
|
|
ihold(inode); |
|
d_instantiate(dentry, inode); |
|
return 0; |
|
} |
|
|
|
STATIC int |
|
xfs_vn_unlink( |
|
struct inode *dir, |
|
struct dentry *dentry) |
|
{ |
|
struct xfs_name name; |
|
int error; |
|
|
|
xfs_dentry_to_name(&name, dentry); |
|
|
|
error = xfs_remove(XFS_I(dir), &name, XFS_I(d_inode(dentry))); |
|
if (error) |
|
return error; |
|
|
|
/* |
|
* With unlink, the VFS makes the dentry "negative": no inode, |
|
* but still hashed. This is incompatible with case-insensitive |
|
* mode, so invalidate (unhash) the dentry in CI-mode. |
|
*/ |
|
if (xfs_has_asciici(XFS_M(dir->i_sb))) |
|
d_invalidate(dentry); |
|
return 0; |
|
} |
|
|
|
STATIC int |
|
xfs_vn_symlink( |
|
struct user_namespace *mnt_userns, |
|
struct inode *dir, |
|
struct dentry *dentry, |
|
const char *symname) |
|
{ |
|
struct inode *inode; |
|
struct xfs_inode *cip = NULL; |
|
struct xfs_name name; |
|
int error; |
|
umode_t mode; |
|
|
|
mode = S_IFLNK | |
|
(irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO); |
|
error = xfs_dentry_mode_to_name(&name, dentry, mode); |
|
if (unlikely(error)) |
|
goto out; |
|
|
|
error = xfs_symlink(mnt_userns, XFS_I(dir), &name, symname, mode, &cip); |
|
if (unlikely(error)) |
|
goto out; |
|
|
|
inode = VFS_I(cip); |
|
|
|
error = xfs_inode_init_security(inode, dir, &dentry->d_name); |
|
if (unlikely(error)) |
|
goto out_cleanup_inode; |
|
|
|
xfs_setup_iops(cip); |
|
|
|
d_instantiate(dentry, inode); |
|
xfs_finish_inode_setup(cip); |
|
return 0; |
|
|
|
out_cleanup_inode: |
|
xfs_finish_inode_setup(cip); |
|
xfs_cleanup_inode(dir, inode, dentry); |
|
xfs_irele(cip); |
|
out: |
|
return error; |
|
} |
|
|
|
STATIC int |
|
xfs_vn_rename( |
|
struct user_namespace *mnt_userns, |
|
struct inode *odir, |
|
struct dentry *odentry, |
|
struct inode *ndir, |
|
struct dentry *ndentry, |
|
unsigned int flags) |
|
{ |
|
struct inode *new_inode = d_inode(ndentry); |
|
int omode = 0; |
|
int error; |
|
struct xfs_name oname; |
|
struct xfs_name nname; |
|
|
|
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
|
return -EINVAL; |
|
|
|
/* if we are exchanging files, we need to set i_mode of both files */ |
|
if (flags & RENAME_EXCHANGE) |
|
omode = d_inode(ndentry)->i_mode; |
|
|
|
error = xfs_dentry_mode_to_name(&oname, odentry, omode); |
|
if (omode && unlikely(error)) |
|
return error; |
|
|
|
error = xfs_dentry_mode_to_name(&nname, ndentry, |
|
d_inode(odentry)->i_mode); |
|
if (unlikely(error)) |
|
return error; |
|
|
|
return xfs_rename(mnt_userns, XFS_I(odir), &oname, |
|
XFS_I(d_inode(odentry)), XFS_I(ndir), &nname, |
|
new_inode ? XFS_I(new_inode) : NULL, flags); |
|
} |
|
|
|
/* |
|
* 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 const char * |
|
xfs_vn_get_link( |
|
struct dentry *dentry, |
|
struct inode *inode, |
|
struct delayed_call *done) |
|
{ |
|
char *link; |
|
int error = -ENOMEM; |
|
|
|
if (!dentry) |
|
return ERR_PTR(-ECHILD); |
|
|
|
link = kmalloc(XFS_SYMLINK_MAXLEN+1, GFP_KERNEL); |
|
if (!link) |
|
goto out_err; |
|
|
|
error = xfs_readlink(XFS_I(d_inode(dentry)), link); |
|
if (unlikely(error)) |
|
goto out_kfree; |
|
|
|
set_delayed_call(done, kfree_link, link); |
|
return link; |
|
|
|
out_kfree: |
|
kfree(link); |
|
out_err: |
|
return ERR_PTR(error); |
|
} |
|
|
|
static uint32_t |
|
xfs_stat_blksize( |
|
struct xfs_inode *ip) |
|
{ |
|
struct xfs_mount *mp = ip->i_mount; |
|
|
|
/* |
|
* If the file blocks are being allocated from a realtime volume, then |
|
* always return the realtime extent size. |
|
*/ |
|
if (XFS_IS_REALTIME_INODE(ip)) |
|
return XFS_FSB_TO_B(mp, xfs_get_extsz_hint(ip)); |
|
|
|
/* |
|
* Allow large block sizes to be reported to userspace programs if the |
|
* "largeio" mount option is used. |
|
* |
|
* If compatibility mode is specified, simply return the basic unit of |
|
* caching so that we don't get inefficient read/modify/write I/O from |
|
* user apps. Otherwise.... |
|
* |
|
* If the underlying volume is a stripe, then return the stripe width in |
|
* bytes as the recommended I/O size. It is not a stripe and we've set a |
|
* default buffered I/O size, return that, otherwise return the compat |
|
* default. |
|
*/ |
|
if (xfs_has_large_iosize(mp)) { |
|
if (mp->m_swidth) |
|
return XFS_FSB_TO_B(mp, mp->m_swidth); |
|
if (xfs_has_allocsize(mp)) |
|
return 1U << mp->m_allocsize_log; |
|
} |
|
|
|
return PAGE_SIZE; |
|
} |
|
|
|
STATIC int |
|
xfs_vn_getattr( |
|
struct user_namespace *mnt_userns, |
|
const struct path *path, |
|
struct kstat *stat, |
|
u32 request_mask, |
|
unsigned int query_flags) |
|
{ |
|
struct inode *inode = d_inode(path->dentry); |
|
struct xfs_inode *ip = XFS_I(inode); |
|
struct xfs_mount *mp = ip->i_mount; |
|
|
|
trace_xfs_getattr(ip); |
|
|
|
if (xfs_is_shutdown(mp)) |
|
return -EIO; |
|
|
|
stat->size = XFS_ISIZE(ip); |
|
stat->dev = inode->i_sb->s_dev; |
|
stat->mode = inode->i_mode; |
|
stat->nlink = inode->i_nlink; |
|
stat->uid = i_uid_into_mnt(mnt_userns, inode); |
|
stat->gid = i_gid_into_mnt(mnt_userns, inode); |
|
stat->ino = ip->i_ino; |
|
stat->atime = inode->i_atime; |
|
stat->mtime = inode->i_mtime; |
|
stat->ctime = inode->i_ctime; |
|
stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks); |
|
|
|
if (xfs_has_v3inodes(mp)) { |
|
if (request_mask & STATX_BTIME) { |
|
stat->result_mask |= STATX_BTIME; |
|
stat->btime = ip->i_crtime; |
|
} |
|
} |
|
|
|
/* |
|
* Note: If you add another clause to set an attribute flag, please |
|
* update attributes_mask below. |
|
*/ |
|
if (ip->i_diflags & XFS_DIFLAG_IMMUTABLE) |
|
stat->attributes |= STATX_ATTR_IMMUTABLE; |
|
if (ip->i_diflags & XFS_DIFLAG_APPEND) |
|
stat->attributes |= STATX_ATTR_APPEND; |
|
if (ip->i_diflags & XFS_DIFLAG_NODUMP) |
|
stat->attributes |= STATX_ATTR_NODUMP; |
|
|
|
stat->attributes_mask |= (STATX_ATTR_IMMUTABLE | |
|
STATX_ATTR_APPEND | |
|
STATX_ATTR_NODUMP); |
|
|
|
switch (inode->i_mode & S_IFMT) { |
|
case S_IFBLK: |
|
case S_IFCHR: |
|
stat->blksize = BLKDEV_IOSIZE; |
|
stat->rdev = inode->i_rdev; |
|
break; |
|
default: |
|
stat->blksize = xfs_stat_blksize(ip); |
|
stat->rdev = 0; |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
xfs_vn_change_ok( |
|
struct user_namespace *mnt_userns, |
|
struct dentry *dentry, |
|
struct iattr *iattr) |
|
{ |
|
struct xfs_mount *mp = XFS_I(d_inode(dentry))->i_mount; |
|
|
|
if (xfs_is_readonly(mp)) |
|
return -EROFS; |
|
|
|
if (xfs_is_shutdown(mp)) |
|
return -EIO; |
|
|
|
return setattr_prepare(mnt_userns, dentry, iattr); |
|
} |
|
|
|
/* |
|
* Set non-size attributes of an inode. |
|
* |
|
* Caution: The caller of this function is responsible for calling |
|
* setattr_prepare() or otherwise verifying the change is fine. |
|
*/ |
|
static int |
|
xfs_setattr_nonsize( |
|
struct user_namespace *mnt_userns, |
|
struct xfs_inode *ip, |
|
struct iattr *iattr) |
|
{ |
|
xfs_mount_t *mp = ip->i_mount; |
|
struct inode *inode = VFS_I(ip); |
|
int mask = iattr->ia_valid; |
|
xfs_trans_t *tp; |
|
int error; |
|
kuid_t uid = GLOBAL_ROOT_UID; |
|
kgid_t gid = GLOBAL_ROOT_GID; |
|
struct xfs_dquot *udqp = NULL, *gdqp = NULL; |
|
struct xfs_dquot *old_udqp = NULL, *old_gdqp = NULL; |
|
|
|
ASSERT((mask & ATTR_SIZE) == 0); |
|
|
|
/* |
|
* If disk quotas is on, we make sure that the dquots do exist on disk, |
|
* before we start any other transactions. Trying to do this later |
|
* is messy. We don't care to take a readlock to look at the ids |
|
* in inode here, because we can't hold it across the trans_reserve. |
|
* If the IDs do change before we take the ilock, we're covered |
|
* because the i_*dquot fields will get updated anyway. |
|
*/ |
|
if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) { |
|
uint qflags = 0; |
|
|
|
if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) { |
|
uid = from_vfsuid(mnt_userns, i_user_ns(inode), |
|
iattr->ia_vfsuid); |
|
qflags |= XFS_QMOPT_UQUOTA; |
|
} else { |
|
uid = inode->i_uid; |
|
} |
|
if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) { |
|
gid = from_vfsgid(mnt_userns, i_user_ns(inode), |
|
iattr->ia_vfsgid); |
|
qflags |= XFS_QMOPT_GQUOTA; |
|
} else { |
|
gid = inode->i_gid; |
|
} |
|
|
|
/* |
|
* We take a reference when we initialize udqp and gdqp, |
|
* so it is important that we never blindly double trip on |
|
* the same variable. See xfs_create() for an example. |
|
*/ |
|
ASSERT(udqp == NULL); |
|
ASSERT(gdqp == NULL); |
|
error = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_projid, |
|
qflags, &udqp, &gdqp, NULL); |
|
if (error) |
|
return error; |
|
} |
|
|
|
error = xfs_trans_alloc_ichange(ip, udqp, gdqp, NULL, |
|
has_capability_noaudit(current, CAP_FOWNER), &tp); |
|
if (error) |
|
goto out_dqrele; |
|
|
|
/* |
|
* Register quota modifications in the transaction. Must be the owner |
|
* or privileged. These IDs could have changed since we last looked at |
|
* them. But, we're assured that if the ownership did change while we |
|
* didn't have the inode locked, inode's dquot(s) would have changed |
|
* also. |
|
*/ |
|
if (XFS_IS_UQUOTA_ON(mp) && |
|
i_uid_needs_update(mnt_userns, iattr, inode)) { |
|
ASSERT(udqp); |
|
old_udqp = xfs_qm_vop_chown(tp, ip, &ip->i_udquot, udqp); |
|
} |
|
if (XFS_IS_GQUOTA_ON(mp) && |
|
i_gid_needs_update(mnt_userns, iattr, inode)) { |
|
ASSERT(xfs_has_pquotino(mp) || !XFS_IS_PQUOTA_ON(mp)); |
|
ASSERT(gdqp); |
|
old_gdqp = xfs_qm_vop_chown(tp, ip, &ip->i_gdquot, gdqp); |
|
} |
|
|
|
setattr_copy(mnt_userns, inode, iattr); |
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
|
|
|
XFS_STATS_INC(mp, xs_ig_attrchg); |
|
|
|
if (xfs_has_wsync(mp)) |
|
xfs_trans_set_sync(tp); |
|
error = xfs_trans_commit(tp); |
|
|
|
/* |
|
* Release any dquot(s) the inode had kept before chown. |
|
*/ |
|
xfs_qm_dqrele(old_udqp); |
|
xfs_qm_dqrele(old_gdqp); |
|
xfs_qm_dqrele(udqp); |
|
xfs_qm_dqrele(gdqp); |
|
|
|
if (error) |
|
return error; |
|
|
|
/* |
|
* XXX(hch): Updating the ACL entries is not atomic vs the i_mode |
|
* update. We could avoid this with linked transactions |
|
* and passing down the transaction pointer all the way |
|
* to attr_set. No previous user of the generic |
|
* Posix ACL code seems to care about this issue either. |
|
*/ |
|
if (mask & ATTR_MODE) { |
|
error = posix_acl_chmod(mnt_userns, inode, inode->i_mode); |
|
if (error) |
|
return error; |
|
} |
|
|
|
return 0; |
|
|
|
out_dqrele: |
|
xfs_qm_dqrele(udqp); |
|
xfs_qm_dqrele(gdqp); |
|
return error; |
|
} |
|
|
|
/* |
|
* Truncate file. Must have write permission and not be a directory. |
|
* |
|
* Caution: The caller of this function is responsible for calling |
|
* setattr_prepare() or otherwise verifying the change is fine. |
|
*/ |
|
STATIC int |
|
xfs_setattr_size( |
|
struct user_namespace *mnt_userns, |
|
struct xfs_inode *ip, |
|
struct iattr *iattr) |
|
{ |
|
struct xfs_mount *mp = ip->i_mount; |
|
struct inode *inode = VFS_I(ip); |
|
xfs_off_t oldsize, newsize; |
|
struct xfs_trans *tp; |
|
int error; |
|
uint lock_flags = 0; |
|
bool did_zeroing = false; |
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); |
|
ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL)); |
|
ASSERT(S_ISREG(inode->i_mode)); |
|
ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET| |
|
ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0); |
|
|
|
oldsize = inode->i_size; |
|
newsize = iattr->ia_size; |
|
|
|
/* |
|
* Short circuit the truncate case for zero length files. |
|
*/ |
|
if (newsize == 0 && oldsize == 0 && ip->i_df.if_nextents == 0) { |
|
if (!(iattr->ia_valid & (ATTR_CTIME|ATTR_MTIME))) |
|
return 0; |
|
|
|
/* |
|
* Use the regular setattr path to update the timestamps. |
|
*/ |
|
iattr->ia_valid &= ~ATTR_SIZE; |
|
return xfs_setattr_nonsize(mnt_userns, ip, iattr); |
|
} |
|
|
|
/* |
|
* Make sure that the dquots are attached to the inode. |
|
*/ |
|
error = xfs_qm_dqattach(ip); |
|
if (error) |
|
return error; |
|
|
|
/* |
|
* Wait for all direct I/O to complete. |
|
*/ |
|
inode_dio_wait(inode); |
|
|
|
/* |
|
* File data changes must be complete before we start the transaction to |
|
* modify the inode. This needs to be done before joining the inode to |
|
* the transaction because the inode cannot be unlocked once it is a |
|
* part of the transaction. |
|
* |
|
* Start with zeroing any data beyond EOF that we may expose on file |
|
* extension, or zeroing out the rest of the block on a downward |
|
* truncate. |
|
*/ |
|
if (newsize > oldsize) { |
|
trace_xfs_zero_eof(ip, oldsize, newsize - oldsize); |
|
error = xfs_zero_range(ip, oldsize, newsize - oldsize, |
|
&did_zeroing); |
|
} else { |
|
/* |
|
* iomap won't detect a dirty page over an unwritten block (or a |
|
* cow block over a hole) and subsequently skips zeroing the |
|
* newly post-EOF portion of the page. Flush the new EOF to |
|
* convert the block before the pagecache truncate. |
|
*/ |
|
error = filemap_write_and_wait_range(inode->i_mapping, newsize, |
|
newsize); |
|
if (error) |
|
return error; |
|
error = xfs_truncate_page(ip, newsize, &did_zeroing); |
|
} |
|
|
|
if (error) |
|
return error; |
|
|
|
/* |
|
* We've already locked out new page faults, so now we can safely remove |
|
* pages from the page cache knowing they won't get refaulted until we |
|
* drop the XFS_MMAP_EXCL lock after the extent manipulations are |
|
* complete. The truncate_setsize() call also cleans partial EOF page |
|
* PTEs on extending truncates and hence ensures sub-page block size |
|
* filesystems are correctly handled, too. |
|
* |
|
* We have to do all the page cache truncate work outside the |
|
* transaction context as the "lock" order is page lock->log space |
|
* reservation as defined by extent allocation in the writeback path. |
|
* Hence a truncate can fail with ENOMEM from xfs_trans_alloc(), but |
|
* having already truncated the in-memory version of the file (i.e. made |
|
* user visible changes). There's not much we can do about this, except |
|
* to hope that the caller sees ENOMEM and retries the truncate |
|
* operation. |
|
* |
|
* And we update in-core i_size and truncate page cache beyond newsize |
|
* before writeback the [i_disk_size, newsize] range, so we're |
|
* guaranteed not to write stale data past the new EOF on truncate down. |
|
*/ |
|
truncate_setsize(inode, newsize); |
|
|
|
/* |
|
* We are going to log the inode size change in this transaction so |
|
* any previous writes that are beyond the on disk EOF and the new |
|
* EOF that have not been written out need to be written here. If we |
|
* do not write the data out, we expose ourselves to the null files |
|
* problem. Note that this includes any block zeroing we did above; |
|
* otherwise those blocks may not be zeroed after a crash. |
|
*/ |
|
if (did_zeroing || |
|
(newsize > ip->i_disk_size && oldsize != ip->i_disk_size)) { |
|
error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, |
|
ip->i_disk_size, newsize - 1); |
|
if (error) |
|
return error; |
|
} |
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp); |
|
if (error) |
|
return error; |
|
|
|
lock_flags |= XFS_ILOCK_EXCL; |
|
xfs_ilock(ip, XFS_ILOCK_EXCL); |
|
xfs_trans_ijoin(tp, ip, 0); |
|
|
|
/* |
|
* Only change the c/mtime if we are changing the size or we are |
|
* explicitly asked to change it. This handles the semantic difference |
|
* between truncate() and ftruncate() as implemented in the VFS. |
|
* |
|
* The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a |
|
* special case where we need to update the times despite not having |
|
* these flags set. For all other operations the VFS set these flags |
|
* explicitly if it wants a timestamp update. |
|
*/ |
|
if (newsize != oldsize && |
|
!(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) { |
|
iattr->ia_ctime = iattr->ia_mtime = |
|
current_time(inode); |
|
iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME; |
|
} |
|
|
|
/* |
|
* The first thing we do is set the size to new_size permanently on |
|
* disk. This way we don't have to worry about anyone ever being able |
|
* to look at the data being freed even in the face of a crash. |
|
* What we're getting around here is the case where we free a block, it |
|
* is allocated to another file, it is written to, and then we crash. |
|
* If the new data gets written to the file but the log buffers |
|
* containing the free and reallocation don't, then we'd end up with |
|
* garbage in the blocks being freed. As long as we make the new size |
|
* permanent before actually freeing any blocks it doesn't matter if |
|
* they get written to. |
|
*/ |
|
ip->i_disk_size = newsize; |
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
|
|
|
if (newsize <= oldsize) { |
|
error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize); |
|
if (error) |
|
goto out_trans_cancel; |
|
|
|
/* |
|
* Truncated "down", so we're removing references to old data |
|
* here - if we delay flushing for a long time, we expose |
|
* ourselves unduly to the notorious NULL files problem. So, |
|
* we mark this inode and flush it when the file is closed, |
|
* and do not wait the usual (long) time for writeout. |
|
*/ |
|
xfs_iflags_set(ip, XFS_ITRUNCATED); |
|
|
|
/* A truncate down always removes post-EOF blocks. */ |
|
xfs_inode_clear_eofblocks_tag(ip); |
|
} |
|
|
|
ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID))); |
|
setattr_copy(mnt_userns, inode, iattr); |
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
|
|
|
XFS_STATS_INC(mp, xs_ig_attrchg); |
|
|
|
if (xfs_has_wsync(mp)) |
|
xfs_trans_set_sync(tp); |
|
|
|
error = xfs_trans_commit(tp); |
|
out_unlock: |
|
if (lock_flags) |
|
xfs_iunlock(ip, lock_flags); |
|
return error; |
|
|
|
out_trans_cancel: |
|
xfs_trans_cancel(tp); |
|
goto out_unlock; |
|
} |
|
|
|
int |
|
xfs_vn_setattr_size( |
|
struct user_namespace *mnt_userns, |
|
struct dentry *dentry, |
|
struct iattr *iattr) |
|
{ |
|
struct xfs_inode *ip = XFS_I(d_inode(dentry)); |
|
int error; |
|
|
|
trace_xfs_setattr(ip); |
|
|
|
error = xfs_vn_change_ok(mnt_userns, dentry, iattr); |
|
if (error) |
|
return error; |
|
return xfs_setattr_size(mnt_userns, ip, iattr); |
|
} |
|
|
|
STATIC int |
|
xfs_vn_setattr( |
|
struct user_namespace *mnt_userns, |
|
struct dentry *dentry, |
|
struct iattr *iattr) |
|
{ |
|
struct inode *inode = d_inode(dentry); |
|
struct xfs_inode *ip = XFS_I(inode); |
|
int error; |
|
|
|
if (iattr->ia_valid & ATTR_SIZE) { |
|
uint iolock; |
|
|
|
xfs_ilock(ip, XFS_MMAPLOCK_EXCL); |
|
iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; |
|
|
|
error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP); |
|
if (error) { |
|
xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); |
|
return error; |
|
} |
|
|
|
error = xfs_vn_setattr_size(mnt_userns, dentry, iattr); |
|
xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); |
|
} else { |
|
trace_xfs_setattr(ip); |
|
|
|
error = xfs_vn_change_ok(mnt_userns, dentry, iattr); |
|
if (!error) |
|
error = xfs_setattr_nonsize(mnt_userns, ip, iattr); |
|
} |
|
|
|
return error; |
|
} |
|
|
|
STATIC int |
|
xfs_vn_update_time( |
|
struct inode *inode, |
|
struct timespec64 *now, |
|
int flags) |
|
{ |
|
struct xfs_inode *ip = XFS_I(inode); |
|
struct xfs_mount *mp = ip->i_mount; |
|
int log_flags = XFS_ILOG_TIMESTAMP; |
|
struct xfs_trans *tp; |
|
int error; |
|
|
|
trace_xfs_update_time(ip); |
|
|
|
if (inode->i_sb->s_flags & SB_LAZYTIME) { |
|
if (!((flags & S_VERSION) && |
|
inode_maybe_inc_iversion(inode, false))) |
|
return generic_update_time(inode, now, flags); |
|
|
|
/* Capture the iversion update that just occurred */ |
|
log_flags |= XFS_ILOG_CORE; |
|
} |
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp); |
|
if (error) |
|
return error; |
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL); |
|
if (flags & S_CTIME) |
|
inode->i_ctime = *now; |
|
if (flags & S_MTIME) |
|
inode->i_mtime = *now; |
|
if (flags & S_ATIME) |
|
inode->i_atime = *now; |
|
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
|
xfs_trans_log_inode(tp, ip, log_flags); |
|
return xfs_trans_commit(tp); |
|
} |
|
|
|
STATIC int |
|
xfs_vn_fiemap( |
|
struct inode *inode, |
|
struct fiemap_extent_info *fieinfo, |
|
u64 start, |
|
u64 length) |
|
{ |
|
int error; |
|
|
|
xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED); |
|
if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) { |
|
fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR; |
|
error = iomap_fiemap(inode, fieinfo, start, length, |
|
&xfs_xattr_iomap_ops); |
|
} else { |
|
error = iomap_fiemap(inode, fieinfo, start, length, |
|
&xfs_read_iomap_ops); |
|
} |
|
xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED); |
|
|
|
return error; |
|
} |
|
|
|
STATIC int |
|
xfs_vn_tmpfile( |
|
struct user_namespace *mnt_userns, |
|
struct inode *dir, |
|
struct dentry *dentry, |
|
umode_t mode) |
|
{ |
|
return xfs_generic_create(mnt_userns, dir, dentry, mode, 0, true); |
|
} |
|
|
|
static const struct inode_operations xfs_inode_operations = { |
|
.get_acl = xfs_get_acl, |
|
.set_acl = xfs_set_acl, |
|
.getattr = xfs_vn_getattr, |
|
.setattr = xfs_vn_setattr, |
|
.listxattr = xfs_vn_listxattr, |
|
.fiemap = xfs_vn_fiemap, |
|
.update_time = xfs_vn_update_time, |
|
.fileattr_get = xfs_fileattr_get, |
|
.fileattr_set = xfs_fileattr_set, |
|
}; |
|
|
|
static const struct inode_operations xfs_dir_inode_operations = { |
|
.create = xfs_vn_create, |
|
.lookup = xfs_vn_lookup, |
|
.link = xfs_vn_link, |
|
.unlink = xfs_vn_unlink, |
|
.symlink = xfs_vn_symlink, |
|
.mkdir = xfs_vn_mkdir, |
|
/* |
|
* Yes, XFS uses the same method for rmdir and unlink. |
|
* |
|
* There are some subtile differences deeper in the code, |
|
* but we use S_ISDIR to check for those. |
|
*/ |
|
.rmdir = xfs_vn_unlink, |
|
.mknod = xfs_vn_mknod, |
|
.rename = xfs_vn_rename, |
|
.get_acl = xfs_get_acl, |
|
.set_acl = xfs_set_acl, |
|
.getattr = xfs_vn_getattr, |
|
.setattr = xfs_vn_setattr, |
|
.listxattr = xfs_vn_listxattr, |
|
.update_time = xfs_vn_update_time, |
|
.tmpfile = xfs_vn_tmpfile, |
|
.fileattr_get = xfs_fileattr_get, |
|
.fileattr_set = xfs_fileattr_set, |
|
}; |
|
|
|
static const struct inode_operations xfs_dir_ci_inode_operations = { |
|
.create = xfs_vn_create, |
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.lookup = xfs_vn_ci_lookup, |
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.link = xfs_vn_link, |
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.unlink = xfs_vn_unlink, |
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.symlink = xfs_vn_symlink, |
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.mkdir = xfs_vn_mkdir, |
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/* |
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* Yes, XFS uses the same method for rmdir and unlink. |
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* |
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* There are some subtile differences deeper in the code, |
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* but we use S_ISDIR to check for those. |
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*/ |
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.rmdir = xfs_vn_unlink, |
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.mknod = xfs_vn_mknod, |
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.rename = xfs_vn_rename, |
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.get_acl = xfs_get_acl, |
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.set_acl = xfs_set_acl, |
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.getattr = xfs_vn_getattr, |
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.setattr = xfs_vn_setattr, |
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.listxattr = xfs_vn_listxattr, |
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.update_time = xfs_vn_update_time, |
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.tmpfile = xfs_vn_tmpfile, |
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.fileattr_get = xfs_fileattr_get, |
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.fileattr_set = xfs_fileattr_set, |
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}; |
|
|
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static const struct inode_operations xfs_symlink_inode_operations = { |
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.get_link = xfs_vn_get_link, |
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.getattr = xfs_vn_getattr, |
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.setattr = xfs_vn_setattr, |
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.listxattr = xfs_vn_listxattr, |
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.update_time = xfs_vn_update_time, |
|
}; |
|
|
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/* Figure out if this file actually supports DAX. */ |
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static bool |
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xfs_inode_supports_dax( |
|
struct xfs_inode *ip) |
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{ |
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struct xfs_mount *mp = ip->i_mount; |
|
|
|
/* Only supported on regular files. */ |
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if (!S_ISREG(VFS_I(ip)->i_mode)) |
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return false; |
|
|
|
/* Only supported on non-reflinked files. */ |
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if (xfs_is_reflink_inode(ip)) |
|
return false; |
|
|
|
/* Block size must match page size */ |
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if (mp->m_sb.sb_blocksize != PAGE_SIZE) |
|
return false; |
|
|
|
/* Device has to support DAX too. */ |
|
return xfs_inode_buftarg(ip)->bt_daxdev != NULL; |
|
} |
|
|
|
static bool |
|
xfs_inode_should_enable_dax( |
|
struct xfs_inode *ip) |
|
{ |
|
if (!IS_ENABLED(CONFIG_FS_DAX)) |
|
return false; |
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if (xfs_has_dax_never(ip->i_mount)) |
|
return false; |
|
if (!xfs_inode_supports_dax(ip)) |
|
return false; |
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if (xfs_has_dax_always(ip->i_mount)) |
|
return true; |
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if (ip->i_diflags2 & XFS_DIFLAG2_DAX) |
|
return true; |
|
return false; |
|
} |
|
|
|
void |
|
xfs_diflags_to_iflags( |
|
struct xfs_inode *ip, |
|
bool init) |
|
{ |
|
struct inode *inode = VFS_I(ip); |
|
unsigned int xflags = xfs_ip2xflags(ip); |
|
unsigned int flags = 0; |
|
|
|
ASSERT(!(IS_DAX(inode) && init)); |
|
|
|
if (xflags & FS_XFLAG_IMMUTABLE) |
|
flags |= S_IMMUTABLE; |
|
if (xflags & FS_XFLAG_APPEND) |
|
flags |= S_APPEND; |
|
if (xflags & FS_XFLAG_SYNC) |
|
flags |= S_SYNC; |
|
if (xflags & FS_XFLAG_NOATIME) |
|
flags |= S_NOATIME; |
|
if (init && xfs_inode_should_enable_dax(ip)) |
|
flags |= S_DAX; |
|
|
|
/* |
|
* S_DAX can only be set during inode initialization and is never set by |
|
* the VFS, so we cannot mask off S_DAX in i_flags. |
|
*/ |
|
inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME); |
|
inode->i_flags |= flags; |
|
} |
|
|
|
/* |
|
* Initialize the Linux inode. |
|
* |
|
* When reading existing inodes from disk this is called directly from xfs_iget, |
|
* when creating a new inode it is called from xfs_init_new_inode after setting |
|
* up the inode. These callers have different criteria for clearing XFS_INEW, so |
|
* leave it up to the caller to deal with unlocking the inode appropriately. |
|
*/ |
|
void |
|
xfs_setup_inode( |
|
struct xfs_inode *ip) |
|
{ |
|
struct inode *inode = &ip->i_vnode; |
|
gfp_t gfp_mask; |
|
|
|
inode->i_ino = ip->i_ino; |
|
inode->i_state |= I_NEW; |
|
|
|
inode_sb_list_add(inode); |
|
/* make the inode look hashed for the writeback code */ |
|
inode_fake_hash(inode); |
|
|
|
i_size_write(inode, ip->i_disk_size); |
|
xfs_diflags_to_iflags(ip, true); |
|
|
|
if (S_ISDIR(inode->i_mode)) { |
|
/* |
|
* We set the i_rwsem class here to avoid potential races with |
|
* lockdep_annotate_inode_mutex_key() reinitialising the lock |
|
* after a filehandle lookup has already found the inode in |
|
* cache before it has been unlocked via unlock_new_inode(). |
|
*/ |
|
lockdep_set_class(&inode->i_rwsem, |
|
&inode->i_sb->s_type->i_mutex_dir_key); |
|
lockdep_set_class(&ip->i_lock.mr_lock, &xfs_dir_ilock_class); |
|
} else { |
|
lockdep_set_class(&ip->i_lock.mr_lock, &xfs_nondir_ilock_class); |
|
} |
|
|
|
/* |
|
* Ensure all page cache allocations are done from GFP_NOFS context to |
|
* prevent direct reclaim recursion back into the filesystem and blowing |
|
* stacks or deadlocking. |
|
*/ |
|
gfp_mask = mapping_gfp_mask(inode->i_mapping); |
|
mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS))); |
|
|
|
/* |
|
* If there is no attribute fork no ACL can exist on this inode, |
|
* and it can't have any file capabilities attached to it either. |
|
*/ |
|
if (!xfs_inode_has_attr_fork(ip)) { |
|
inode_has_no_xattr(inode); |
|
cache_no_acl(inode); |
|
} |
|
} |
|
|
|
void |
|
xfs_setup_iops( |
|
struct xfs_inode *ip) |
|
{ |
|
struct inode *inode = &ip->i_vnode; |
|
|
|
switch (inode->i_mode & S_IFMT) { |
|
case S_IFREG: |
|
inode->i_op = &xfs_inode_operations; |
|
inode->i_fop = &xfs_file_operations; |
|
if (IS_DAX(inode)) |
|
inode->i_mapping->a_ops = &xfs_dax_aops; |
|
else |
|
inode->i_mapping->a_ops = &xfs_address_space_operations; |
|
break; |
|
case S_IFDIR: |
|
if (xfs_has_asciici(XFS_M(inode->i_sb))) |
|
inode->i_op = &xfs_dir_ci_inode_operations; |
|
else |
|
inode->i_op = &xfs_dir_inode_operations; |
|
inode->i_fop = &xfs_dir_file_operations; |
|
break; |
|
case S_IFLNK: |
|
inode->i_op = &xfs_symlink_inode_operations; |
|
break; |
|
default: |
|
inode->i_op = &xfs_inode_operations; |
|
init_special_inode(inode, inode->i_mode, inode->i_rdev); |
|
break; |
|
} |
|
}
|
|
|