| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_shared.h" |
| #include "xfs_format.h" |
| #include "xfs_log_format.h" |
| #include "xfs_trans_resv.h" |
| #include "xfs_mount.h" |
| #include "xfs_inode.h" |
| #include "xfs_acl.h" |
| #include "xfs_quota.h" |
| #include "xfs_da_format.h" |
| #include "xfs_da_btree.h" |
| #include "xfs_attr.h" |
| #include "xfs_trans.h" |
| #include "xfs_trace.h" |
| #include "xfs_icache.h" |
| #include "xfs_symlink.h" |
| #include "xfs_dir2.h" |
| #include "xfs_iomap.h" |
| #include "xfs_error.h" |
| #include "xfs_ioctl.h" |
| #include "xfs_xattr.h" |
| |
| #include <linux/posix_acl.h> |
| #include <linux/security.h> |
| #include <linux/iversion.h> |
| #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 |
| * held. For regular files, the lock order is the other way around - the |
| * mmap_lock is taken during the page fault, and then we lock the ilock to do |
| * block mapping. Hence we need a different class for the directory ilock so |
| * that lockdep can tell them apart. |
| */ |
| static struct lock_class_key xfs_nondir_ilock_class; |
| static struct lock_class_key xfs_dir_ilock_class; |
| |
| static int |
| xfs_initxattrs( |
| struct inode *inode, |
| const struct xattr *xattr_array, |
| void *fs_info) |
| { |
| const struct xattr *xattr; |
| struct xfs_inode *ip = XFS_I(inode); |
| int error = 0; |
| |
| for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
| struct xfs_da_args args = { |
| .dp = ip, |
| .attr_filter = XFS_ATTR_SECURE, |
| .name = xattr->name, |
| .namelen = strlen(xattr->name), |
| .value = xattr->value, |
| .valuelen = xattr->value_len, |
| }; |
| error = xfs_attr_change(&args); |
| if (error < 0) |
| break; |
| } |
| return error; |
| } |
| |
| /* |
| * Hook in SELinux. This is not quite correct yet, what we really need |
| * here (as we do for default ACLs) is a mechanism by which creation of |
| * these attrs can be journalled at inode creation time (along with the |
| * inode, of course, such that log replay can't cause these to be lost). |
| */ |
| |
| STATIC int |
| xfs_init_security( |
| struct inode *inode, |
| struct inode *dir, |
| const struct qstr *qstr) |
| { |
| return security_inode_init_security(inode, dir, qstr, |
| &xfs_initxattrs, NULL); |
| } |
| |
| static void |
| xfs_dentry_to_name( |
| struct xfs_name *namep, |
| struct dentry *dentry) |
| { |
| namep->name = dentry->d_name.name; |
| namep->len = dentry->d_name.len; |
| namep->type = XFS_DIR3_FT_UNKNOWN; |
| } |
| |
| static int |
| xfs_dentry_mode_to_name( |
| struct xfs_name *namep, |
| struct dentry *dentry, |
| int mode) |
| { |
| namep->name = dentry->d_name.name; |
| namep->len = dentry->d_name.len; |
| namep->type = xfs_mode_to_ftype(mode); |
| |
| if (unlikely(namep->type == XFS_DIR3_FT_UNKNOWN)) |
| return -EFSCORRUPTED; |
| |
| return 0; |
| } |
| |
| STATIC void |
| xfs_cleanup_inode( |
| 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_init_security we must back out. |
| * ENOSPC can hit here, among other things. |
| */ |
| xfs_dentry_to_name(&teardown, dentry); |
| |
| xfs_remove(XFS_I(dir), &teardown, XFS_I(inode)); |
| } |
| |
| /* |
| * Check to see if we are likely to need an extended attribute to be added to |
| * the inode we are about to allocate. This allows the attribute fork to be |
| * created during the inode allocation, reducing the number of transactions we |
| * need to do in this fast path. |
| * |
| * The security checks are optimistic, but not guaranteed. The two LSMs that |
| * require xattrs to be added here (selinux and smack) are also the only two |
| * LSMs that add a sb->s_security structure to the superblock. Hence if security |
| * is enabled and sb->s_security is set, we have a pretty good idea that we are |
| * going to be asked to add a security xattr immediately after allocating the |
| * xfs inode and instantiating the VFS inode. |
| */ |
| static inline bool |
| xfs_create_need_xattr( |
| struct inode *dir, |
| struct posix_acl *default_acl, |
| struct posix_acl *acl) |
| { |
| if (acl) |
| return true; |
| if (default_acl) |
| return true; |
| #if IS_ENABLED(CONFIG_SECURITY) |
| if (dir->i_sb->s_security) |
| return true; |
| #endif |
| return false; |
| } |
| |
| |
| STATIC int |
| xfs_generic_create( |
| struct user_namespace *mnt_userns, |
| struct inode *dir, |
| struct dentry *dentry, |
| umode_t mode, |
| dev_t rdev, |
| bool tmpfile) /* unnamed file */ |
| { |
| struct inode *inode; |
| struct xfs_inode *ip = NULL; |
| struct posix_acl *default_acl, *acl; |
| struct xfs_name name; |
| 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)) { |
| if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff)) |
| return -EINVAL; |
| } else { |
| rdev = 0; |
| } |
| |
| error = posix_acl_create(dir, &mode, &default_acl, &acl); |
| if (error) |
| return error; |
| |
| /* Verify mode is valid also for tmpfile case */ |
| error = xfs_dentry_mode_to_name(&name, dentry, mode); |
| if (unlikely(error)) |
| goto out_free_acl; |
| |
| if (!tmpfile) { |
| error = xfs_create(mnt_userns, XFS_I(dir), &name, mode, rdev, |
| xfs_create_need_xattr(dir, default_acl, acl), |
| &ip); |
| } else { |
| error = xfs_create_tmpfile(mnt_userns, XFS_I(dir), mode, &ip); |
| } |
| if (unlikely(error)) |
| goto out_free_acl; |
| |
| inode = VFS_I(ip); |
| |
| error = xfs_init_security(inode, dir, &dentry->d_name); |
| if (unlikely(error)) |
| goto out_cleanup_inode; |
| |
| if (default_acl) { |
| error = __xfs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); |
| if (error) |
| goto out_cleanup_inode; |
| } |
| if (acl) { |
| error = __xfs_set_acl(inode, acl, ACL_TYPE_ACCESS); |
| if (error) |
| goto out_cleanup_inode; |
| } |
| |
| xfs_setup_iops(ip); |
| |
| if (tmpfile) { |
| /* |
| * The VFS requires that any inode fed to d_tmpfile must have |
| * nlink == 1 so that it can decrement the nlink in d_tmpfile. |
| * However, we created the temp file with nlink == 0 because |
| * we're not allowed to put an inode with nlink > 0 on the |
| * unlinked list. Therefore we have to set nlink to 1 so that |
| * d_tmpfile can immediately set it back to zero. |
| */ |
| set_nlink(inode, 1); |
| d_tmpfile(dentry, inode); |
| } else |
| d_instantiate(dentry, inode); |
| |
| xfs_finish_inode_setup(ip); |
| |
| out_free_acl: |
| posix_acl_release(default_acl); |
| posix_acl_release(acl); |
| return error; |
| |
| out_cleanup_inode: |
| xfs_finish_inode_setup(ip); |
| if (!tmpfile) |
| xfs_cleanup_inode(dir, inode, dentry); |
| xfs_irele(ip); |
| goto out_free_acl; |
| } |
| |
| STATIC int |
| xfs_vn_mknod( |
| struct user_namespace *mnt_userns, |
| struct inode *dir, |
| struct dentry *dentry, |
| umode_t mode, |
| dev_t rdev) |
| { |
| return xfs_generic_create(mnt_userns, dir, dentry, mode, rdev, false); |
| } |
| |
| STATIC int |
| xfs_vn_create( |
| struct user_namespace *mnt_userns, |
| struct inode *dir, |
| struct dentry *dentry, |
| umode_t mode, |
| bool flags) |
| { |
| return xfs_generic_create(mnt_userns, dir, dentry, mode, 0, false); |
| } |
| |
| STATIC int |
| xfs_vn_mkdir( |
| struct user_namespace *mnt_userns, |
| struct inode *dir, |
| struct dentry *dentry, |
| umode_t mode) |
| { |
| return xfs_generic_create(mnt_userns, dir, dentry, mode | S_IFDIR, 0, |
| false); |
| } |
| |
| STATIC struct dentry * |
| xfs_vn_lookup( |
| struct inode *dir, |
| struct dentry *dentry, |
| unsigned int flags) |
| { |
| struct inode *inode; |
| struct xfs_inode *cip; |
| struct xfs_name name; |
| int error; |
| |
| if (dentry->d_name.len >= MAXNAMELEN) |
| return ERR_PTR(-ENAMETOOLONG); |
| |
| xfs_dentry_to_name(&name, dentry); |
| error = xfs_lookup(XFS_I(dir), &name, &cip, NULL); |
| if (likely(!error)) |
| inode = VFS_I(cip); |
| else if (likely(error == -ENOENT)) |
| inode = NULL; |
| else |
| inode = ERR_PTR(error); |
| return d_splice_alias(inode, dentry); |
| } |
| |
| STATIC struct dentry * |
| xfs_vn_ci_lookup( |
| struct inode *dir, |
| 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) |
| return ERR_PTR(-ENAMETOOLONG); |
| |
| xfs_dentry_to_name(&xname, dentry); |
| 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_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 = iattr->ia_uid; |
| qflags |= XFS_QMOPT_UQUOTA; |
| } else { |
| uid = inode->i_uid; |
| } |
| if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) { |
| gid = iattr->ia_gid; |
| 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 ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp) && |
| !uid_eq(inode->i_uid, iattr->ia_uid)) { |
| ASSERT(udqp); |
| old_udqp = xfs_qm_vop_chown(tp, ip, &ip->i_udquot, udqp); |
| } |
| if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp) && |
| !gid_eq(inode->i_gid, iattr->ia_gid)) { |
| 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, |
| .lookup = xfs_vn_ci_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_symlink_inode_operations = { |
| .get_link = xfs_vn_get_link, |
| .getattr = xfs_vn_getattr, |
| .setattr = xfs_vn_setattr, |
| .listxattr = xfs_vn_listxattr, |
| .update_time = xfs_vn_update_time, |
| }; |
| |
| /* Figure out if this file actually supports DAX. */ |
| static bool |
| xfs_inode_supports_dax( |
| struct xfs_inode *ip) |
| { |
| struct xfs_mount *mp = ip->i_mount; |
| |
| /* Only supported on regular files. */ |
| if (!S_ISREG(VFS_I(ip)->i_mode)) |
| return false; |
| |
| /* Only supported on non-reflinked files. */ |
| if (xfs_is_reflink_inode(ip)) |
| return false; |
| |
| /* Block size must match page size */ |
| 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; |
| if (xfs_has_dax_never(ip->i_mount)) |
| return false; |
| if (!xfs_inode_supports_dax(ip)) |
| return false; |
| if (xfs_has_dax_always(ip->i_mount)) |
| return true; |
| 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_IFORK_Q(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; |
| } |
| } |