| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms 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. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_acl.h" |
| #include "xfs_bit.h" |
| #include "xfs_log.h" |
| #include "xfs_inum.h" |
| #include "xfs_trans.h" |
| #include "xfs_sb.h" |
| #include "xfs_ag.h" |
| #include "xfs_alloc.h" |
| #include "xfs_quota.h" |
| #include "xfs_mount.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_dinode.h" |
| #include "xfs_inode.h" |
| #include "xfs_bmap.h" |
| #include "xfs_rtalloc.h" |
| #include "xfs_error.h" |
| #include "xfs_itable.h" |
| #include "xfs_rw.h" |
| #include "xfs_attr.h" |
| #include "xfs_buf_item.h" |
| #include "xfs_utils.h" |
| #include "xfs_vnodeops.h" |
| #include "xfs_inode_item.h" |
| #include "xfs_trace.h" |
| |
| #include <linux/capability.h> |
| #include <linux/xattr.h> |
| #include <linux/namei.h> |
| #include <linux/posix_acl.h> |
| #include <linux/security.h> |
| #include <linux/fiemap.h> |
| #include <linux/slab.h> |
| |
| 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++) { |
| error = xfs_attr_set(ip, xattr->name, xattr->value, |
| xattr->value_len, ATTR_SECURE); |
| 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; |
| } |
| |
| 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)); |
| iput(inode); |
| } |
| |
| STATIC int |
| xfs_vn_mknod( |
| struct inode *dir, |
| struct dentry *dentry, |
| umode_t mode, |
| dev_t rdev) |
| { |
| struct inode *inode; |
| struct xfs_inode *ip = NULL; |
| struct posix_acl *default_acl = NULL; |
| 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; |
| rdev = sysv_encode_dev(rdev); |
| } else { |
| rdev = 0; |
| } |
| |
| if (IS_POSIXACL(dir)) { |
| default_acl = xfs_get_acl(dir, ACL_TYPE_DEFAULT); |
| if (IS_ERR(default_acl)) |
| return PTR_ERR(default_acl); |
| |
| if (!default_acl) |
| mode &= ~current_umask(); |
| } |
| |
| xfs_dentry_to_name(&name, dentry); |
| error = xfs_create(XFS_I(dir), &name, mode, rdev, &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_inherit_acl(inode, default_acl); |
| default_acl = NULL; |
| if (unlikely(error)) |
| goto out_cleanup_inode; |
| } |
| |
| |
| d_instantiate(dentry, inode); |
| return -error; |
| |
| out_cleanup_inode: |
| xfs_cleanup_inode(dir, inode, dentry); |
| out_free_acl: |
| posix_acl_release(default_acl); |
| return -error; |
| } |
| |
| STATIC int |
| xfs_vn_create( |
| struct inode *dir, |
| struct dentry *dentry, |
| umode_t mode, |
| struct nameidata *nd) |
| { |
| return xfs_vn_mknod(dir, dentry, mode, 0); |
| } |
| |
| STATIC int |
| xfs_vn_mkdir( |
| struct inode *dir, |
| struct dentry *dentry, |
| umode_t mode) |
| { |
| return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0); |
| } |
| |
| STATIC struct dentry * |
| xfs_vn_lookup( |
| struct inode *dir, |
| struct dentry *dentry, |
| unsigned int flags) |
| { |
| 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 (unlikely(error)) { |
| if (unlikely(error != ENOENT)) |
| return ERR_PTR(-error); |
| d_add(dentry, NULL); |
| return NULL; |
| } |
| |
| return d_splice_alias(VFS_I(cip), 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 = old_dentry->d_inode; |
| struct xfs_name name; |
| int error; |
| |
| xfs_dentry_to_name(&name, dentry); |
| |
| 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(dentry->d_inode)); |
| 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_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb)) |
| d_invalidate(dentry); |
| return 0; |
| } |
| |
| STATIC int |
| xfs_vn_symlink( |
| 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); |
| xfs_dentry_to_name(&name, dentry); |
| |
| error = xfs_symlink(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; |
| |
| d_instantiate(dentry, inode); |
| return 0; |
| |
| out_cleanup_inode: |
| xfs_cleanup_inode(dir, inode, dentry); |
| out: |
| return -error; |
| } |
| |
| STATIC int |
| xfs_vn_rename( |
| struct inode *odir, |
| struct dentry *odentry, |
| struct inode *ndir, |
| struct dentry *ndentry) |
| { |
| struct inode *new_inode = ndentry->d_inode; |
| struct xfs_name oname; |
| struct xfs_name nname; |
| |
| xfs_dentry_to_name(&oname, odentry); |
| xfs_dentry_to_name(&nname, ndentry); |
| |
| return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode), |
| XFS_I(ndir), &nname, new_inode ? |
| XFS_I(new_inode) : NULL); |
| } |
| |
| /* |
| * 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 void * |
| xfs_vn_follow_link( |
| struct dentry *dentry, |
| struct nameidata *nd) |
| { |
| char *link; |
| int error = -ENOMEM; |
| |
| link = kmalloc(MAXPATHLEN+1, GFP_KERNEL); |
| if (!link) |
| goto out_err; |
| |
| error = -xfs_readlink(XFS_I(dentry->d_inode), link); |
| if (unlikely(error)) |
| goto out_kfree; |
| |
| nd_set_link(nd, link); |
| return NULL; |
| |
| out_kfree: |
| kfree(link); |
| out_err: |
| nd_set_link(nd, ERR_PTR(error)); |
| return NULL; |
| } |
| |
| STATIC void |
| xfs_vn_put_link( |
| struct dentry *dentry, |
| struct nameidata *nd, |
| void *p) |
| { |
| char *s = nd_get_link(nd); |
| |
| if (!IS_ERR(s)) |
| kfree(s); |
| } |
| |
| STATIC int |
| xfs_vn_getattr( |
| struct vfsmount *mnt, |
| struct dentry *dentry, |
| struct kstat *stat) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct xfs_inode *ip = XFS_I(inode); |
| struct xfs_mount *mp = ip->i_mount; |
| |
| trace_xfs_getattr(ip); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return -XFS_ERROR(EIO); |
| |
| stat->size = XFS_ISIZE(ip); |
| stat->dev = inode->i_sb->s_dev; |
| stat->mode = ip->i_d.di_mode; |
| stat->nlink = ip->i_d.di_nlink; |
| stat->uid = ip->i_d.di_uid; |
| stat->gid = ip->i_d.di_gid; |
| 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_d.di_nblocks + ip->i_delayed_blks); |
| |
| |
| switch (inode->i_mode & S_IFMT) { |
| case S_IFBLK: |
| case S_IFCHR: |
| stat->blksize = BLKDEV_IOSIZE; |
| stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff, |
| sysv_minor(ip->i_df.if_u2.if_rdev)); |
| break; |
| default: |
| if (XFS_IS_REALTIME_INODE(ip)) { |
| /* |
| * If the file blocks are being allocated from a |
| * realtime volume, then return the inode's realtime |
| * extent size or the realtime volume's extent size. |
| */ |
| stat->blksize = |
| xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog; |
| } else |
| stat->blksize = xfs_preferred_iosize(mp); |
| stat->rdev = 0; |
| break; |
| } |
| |
| return 0; |
| } |
| |
| int |
| xfs_setattr_nonsize( |
| struct xfs_inode *ip, |
| struct iattr *iattr, |
| int flags) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| struct inode *inode = VFS_I(ip); |
| int mask = iattr->ia_valid; |
| xfs_trans_t *tp; |
| int error; |
| uid_t uid = 0, iuid = 0; |
| gid_t gid = 0, igid = 0; |
| struct xfs_dquot *udqp = NULL, *gdqp = NULL; |
| struct xfs_dquot *olddquot1 = NULL, *olddquot2 = NULL; |
| |
| trace_xfs_setattr(ip); |
| |
| if (mp->m_flags & XFS_MOUNT_RDONLY) |
| return XFS_ERROR(EROFS); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| error = -inode_change_ok(inode, iattr); |
| if (error) |
| return XFS_ERROR(error); |
| |
| 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 = ip->i_d.di_uid; |
| } |
| if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) { |
| gid = iattr->ia_gid; |
| qflags |= XFS_QMOPT_GQUOTA; |
| } else { |
| gid = ip->i_d.di_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, xfs_get_projid(ip), |
| qflags, &udqp, &gdqp); |
| if (error) |
| return error; |
| } |
| |
| tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); |
| error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0); |
| if (error) |
| goto out_dqrele; |
| |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| |
| /* |
| * Change file ownership. Must be the owner or privileged. |
| */ |
| if (mask & (ATTR_UID|ATTR_GID)) { |
| /* |
| * 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. |
| */ |
| iuid = ip->i_d.di_uid; |
| igid = ip->i_d.di_gid; |
| gid = (mask & ATTR_GID) ? iattr->ia_gid : igid; |
| uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid; |
| |
| /* |
| * Do a quota reservation only if uid/gid is actually |
| * going to change. |
| */ |
| if (XFS_IS_QUOTA_RUNNING(mp) && |
| ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) || |
| (XFS_IS_GQUOTA_ON(mp) && igid != gid))) { |
| ASSERT(tp); |
| error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp, |
| capable(CAP_FOWNER) ? |
| XFS_QMOPT_FORCE_RES : 0); |
| if (error) /* out of quota */ |
| goto out_trans_cancel; |
| } |
| } |
| |
| xfs_trans_ijoin(tp, ip, 0); |
| |
| /* |
| * Change file ownership. Must be the owner or privileged. |
| */ |
| if (mask & (ATTR_UID|ATTR_GID)) { |
| /* |
| * CAP_FSETID overrides the following restrictions: |
| * |
| * The set-user-ID and set-group-ID bits of a file will be |
| * cleared upon successful return from chown() |
| */ |
| if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) && |
| !capable(CAP_FSETID)) |
| ip->i_d.di_mode &= ~(S_ISUID|S_ISGID); |
| |
| /* |
| * Change the ownerships and register quota modifications |
| * in the transaction. |
| */ |
| if (iuid != uid) { |
| if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) { |
| ASSERT(mask & ATTR_UID); |
| ASSERT(udqp); |
| olddquot1 = xfs_qm_vop_chown(tp, ip, |
| &ip->i_udquot, udqp); |
| } |
| ip->i_d.di_uid = uid; |
| inode->i_uid = uid; |
| } |
| if (igid != gid) { |
| if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) { |
| ASSERT(!XFS_IS_PQUOTA_ON(mp)); |
| ASSERT(mask & ATTR_GID); |
| ASSERT(gdqp); |
| olddquot2 = xfs_qm_vop_chown(tp, ip, |
| &ip->i_gdquot, gdqp); |
| } |
| ip->i_d.di_gid = gid; |
| inode->i_gid = gid; |
| } |
| } |
| |
| /* |
| * Change file access modes. |
| */ |
| if (mask & ATTR_MODE) { |
| umode_t mode = iattr->ia_mode; |
| |
| if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) |
| mode &= ~S_ISGID; |
| |
| ip->i_d.di_mode &= S_IFMT; |
| ip->i_d.di_mode |= mode & ~S_IFMT; |
| |
| inode->i_mode &= S_IFMT; |
| inode->i_mode |= mode & ~S_IFMT; |
| } |
| |
| /* |
| * Change file access or modified times. |
| */ |
| if (mask & ATTR_ATIME) { |
| inode->i_atime = iattr->ia_atime; |
| ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec; |
| ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec; |
| } |
| if (mask & ATTR_CTIME) { |
| inode->i_ctime = iattr->ia_ctime; |
| ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec; |
| ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec; |
| } |
| if (mask & ATTR_MTIME) { |
| inode->i_mtime = iattr->ia_mtime; |
| ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec; |
| ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec; |
| } |
| |
| xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| |
| XFS_STATS_INC(xs_ig_attrchg); |
| |
| if (mp->m_flags & XFS_MOUNT_WSYNC) |
| xfs_trans_set_sync(tp); |
| error = xfs_trans_commit(tp, 0); |
| |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| |
| /* |
| * Release any dquot(s) the inode had kept before chown. |
| */ |
| xfs_qm_dqrele(olddquot1); |
| xfs_qm_dqrele(olddquot2); |
| xfs_qm_dqrele(udqp); |
| xfs_qm_dqrele(gdqp); |
| |
| if (error) |
| return XFS_ERROR(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) && !(flags & XFS_ATTR_NOACL)) { |
| error = -xfs_acl_chmod(inode); |
| if (error) |
| return XFS_ERROR(error); |
| } |
| |
| return 0; |
| |
| out_trans_cancel: |
| xfs_trans_cancel(tp, 0); |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| out_dqrele: |
| xfs_qm_dqrele(udqp); |
| xfs_qm_dqrele(gdqp); |
| return error; |
| } |
| |
| /* |
| * Truncate file. Must have write permission and not be a directory. |
| */ |
| int |
| xfs_setattr_size( |
| struct xfs_inode *ip, |
| struct iattr *iattr, |
| int flags) |
| { |
| struct xfs_mount *mp = ip->i_mount; |
| struct inode *inode = VFS_I(ip); |
| int mask = iattr->ia_valid; |
| xfs_off_t oldsize, newsize; |
| struct xfs_trans *tp; |
| int error; |
| uint lock_flags; |
| uint commit_flags = 0; |
| |
| trace_xfs_setattr(ip); |
| |
| if (mp->m_flags & XFS_MOUNT_RDONLY) |
| return XFS_ERROR(EROFS); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| error = -inode_change_ok(inode, iattr); |
| if (error) |
| return XFS_ERROR(error); |
| |
| ASSERT(S_ISREG(ip->i_d.di_mode)); |
| ASSERT((mask & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET| |
| ATTR_MTIME_SET|ATTR_KILL_SUID|ATTR_KILL_SGID| |
| ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0); |
| |
| lock_flags = XFS_ILOCK_EXCL; |
| if (!(flags & XFS_ATTR_NOLOCK)) |
| lock_flags |= XFS_IOLOCK_EXCL; |
| xfs_ilock(ip, lock_flags); |
| |
| oldsize = inode->i_size; |
| newsize = iattr->ia_size; |
| |
| /* |
| * Short circuit the truncate case for zero length files. |
| */ |
| if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) { |
| if (!(mask & (ATTR_CTIME|ATTR_MTIME))) |
| goto out_unlock; |
| |
| /* |
| * Use the regular setattr path to update the timestamps. |
| */ |
| xfs_iunlock(ip, lock_flags); |
| iattr->ia_valid &= ~ATTR_SIZE; |
| return xfs_setattr_nonsize(ip, iattr, 0); |
| } |
| |
| /* |
| * Make sure that the dquots are attached to the inode. |
| */ |
| error = xfs_qm_dqattach_locked(ip, 0); |
| if (error) |
| goto out_unlock; |
| |
| /* |
| * Now we can make the changes. Before we join the inode to the |
| * transaction, take care of the part of the truncation that must be |
| * done without the inode lock. 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. |
| */ |
| if (newsize > oldsize) { |
| /* |
| * Do the first part of growing a file: zero any data in the |
| * last block that is beyond the old EOF. We need to do this |
| * before the inode is joined to the transaction to modify |
| * i_size. |
| */ |
| error = xfs_zero_eof(ip, newsize, oldsize); |
| if (error) |
| goto out_unlock; |
| } |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| lock_flags &= ~XFS_ILOCK_EXCL; |
| |
| /* |
| * 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. |
| * |
| * Only flush from the on disk size to the smaller of the in memory |
| * file size or the new size as that's the range we really care about |
| * here and prevents waiting for other data not within the range we |
| * care about here. |
| */ |
| if (oldsize != ip->i_d.di_size && newsize > ip->i_d.di_size) { |
| error = xfs_flush_pages(ip, ip->i_d.di_size, newsize, 0, |
| FI_NONE); |
| if (error) |
| goto out_unlock; |
| } |
| |
| /* |
| * Wait for all direct I/O to complete. |
| */ |
| inode_dio_wait(inode); |
| |
| error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks); |
| if (error) |
| goto out_unlock; |
| |
| tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE); |
| error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, |
| XFS_TRANS_PERM_LOG_RES, |
| XFS_ITRUNCATE_LOG_COUNT); |
| if (error) |
| goto out_trans_cancel; |
| |
| truncate_setsize(inode, newsize); |
| |
| commit_flags = XFS_TRANS_RELEASE_LOG_RES; |
| 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 && (!(mask & (ATTR_CTIME | ATTR_MTIME)))) { |
| iattr->ia_ctime = iattr->ia_mtime = |
| current_fs_time(inode->i_sb); |
| mask |= 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_d.di_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_abort; |
| |
| /* |
| * 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); |
| } |
| |
| if (mask & ATTR_CTIME) { |
| inode->i_ctime = iattr->ia_ctime; |
| ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec; |
| ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec; |
| } |
| if (mask & ATTR_MTIME) { |
| inode->i_mtime = iattr->ia_mtime; |
| ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec; |
| ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec; |
| } |
| |
| xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| |
| XFS_STATS_INC(xs_ig_attrchg); |
| |
| if (mp->m_flags & XFS_MOUNT_WSYNC) |
| xfs_trans_set_sync(tp); |
| |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| out_unlock: |
| if (lock_flags) |
| xfs_iunlock(ip, lock_flags); |
| return error; |
| |
| out_trans_abort: |
| commit_flags |= XFS_TRANS_ABORT; |
| out_trans_cancel: |
| xfs_trans_cancel(tp, commit_flags); |
| goto out_unlock; |
| } |
| |
| STATIC int |
| xfs_vn_setattr( |
| struct dentry *dentry, |
| struct iattr *iattr) |
| { |
| if (iattr->ia_valid & ATTR_SIZE) |
| return -xfs_setattr_size(XFS_I(dentry->d_inode), iattr, 0); |
| return -xfs_setattr_nonsize(XFS_I(dentry->d_inode), iattr, 0); |
| } |
| |
| #define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR) |
| |
| /* |
| * Call fiemap helper to fill in user data. |
| * Returns positive errors to xfs_getbmap. |
| */ |
| STATIC int |
| xfs_fiemap_format( |
| void **arg, |
| struct getbmapx *bmv, |
| int *full) |
| { |
| int error; |
| struct fiemap_extent_info *fieinfo = *arg; |
| u32 fiemap_flags = 0; |
| u64 logical, physical, length; |
| |
| /* Do nothing for a hole */ |
| if (bmv->bmv_block == -1LL) |
| return 0; |
| |
| logical = BBTOB(bmv->bmv_offset); |
| physical = BBTOB(bmv->bmv_block); |
| length = BBTOB(bmv->bmv_length); |
| |
| if (bmv->bmv_oflags & BMV_OF_PREALLOC) |
| fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN; |
| else if (bmv->bmv_oflags & BMV_OF_DELALLOC) { |
| fiemap_flags |= FIEMAP_EXTENT_DELALLOC; |
| physical = 0; /* no block yet */ |
| } |
| if (bmv->bmv_oflags & BMV_OF_LAST) |
| fiemap_flags |= FIEMAP_EXTENT_LAST; |
| |
| error = fiemap_fill_next_extent(fieinfo, logical, physical, |
| length, fiemap_flags); |
| if (error > 0) { |
| error = 0; |
| *full = 1; /* user array now full */ |
| } |
| |
| return -error; |
| } |
| |
| STATIC int |
| xfs_vn_fiemap( |
| struct inode *inode, |
| struct fiemap_extent_info *fieinfo, |
| u64 start, |
| u64 length) |
| { |
| xfs_inode_t *ip = XFS_I(inode); |
| struct getbmapx bm; |
| int error; |
| |
| error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS); |
| if (error) |
| return error; |
| |
| /* Set up bmap header for xfs internal routine */ |
| bm.bmv_offset = BTOBB(start); |
| /* Special case for whole file */ |
| if (length == FIEMAP_MAX_OFFSET) |
| bm.bmv_length = -1LL; |
| else |
| bm.bmv_length = BTOBB(length); |
| |
| /* We add one because in getbmap world count includes the header */ |
| bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM : |
| fieinfo->fi_extents_max + 1; |
| bm.bmv_count = min_t(__s32, bm.bmv_count, |
| (PAGE_SIZE * 16 / sizeof(struct getbmapx))); |
| bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES; |
| if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) |
| bm.bmv_iflags |= BMV_IF_ATTRFORK; |
| if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC)) |
| bm.bmv_iflags |= BMV_IF_DELALLOC; |
| |
| error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo); |
| if (error) |
| return -error; |
| |
| return 0; |
| } |
| |
| static const struct inode_operations xfs_inode_operations = { |
| .get_acl = xfs_get_acl, |
| .getattr = xfs_vn_getattr, |
| .setattr = xfs_vn_setattr, |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .removexattr = generic_removexattr, |
| .listxattr = xfs_vn_listxattr, |
| .fiemap = xfs_vn_fiemap, |
| }; |
| |
| 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, |
| .getattr = xfs_vn_getattr, |
| .setattr = xfs_vn_setattr, |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .removexattr = generic_removexattr, |
| .listxattr = xfs_vn_listxattr, |
| }; |
| |
| 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, |
| .getattr = xfs_vn_getattr, |
| .setattr = xfs_vn_setattr, |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .removexattr = generic_removexattr, |
| .listxattr = xfs_vn_listxattr, |
| }; |
| |
| static const struct inode_operations xfs_symlink_inode_operations = { |
| .readlink = generic_readlink, |
| .follow_link = xfs_vn_follow_link, |
| .put_link = xfs_vn_put_link, |
| .get_acl = xfs_get_acl, |
| .getattr = xfs_vn_getattr, |
| .setattr = xfs_vn_setattr, |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .removexattr = generic_removexattr, |
| .listxattr = xfs_vn_listxattr, |
| }; |
| |
| STATIC void |
| xfs_diflags_to_iflags( |
| struct inode *inode, |
| struct xfs_inode *ip) |
| { |
| if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE) |
| inode->i_flags |= S_IMMUTABLE; |
| else |
| inode->i_flags &= ~S_IMMUTABLE; |
| if (ip->i_d.di_flags & XFS_DIFLAG_APPEND) |
| inode->i_flags |= S_APPEND; |
| else |
| inode->i_flags &= ~S_APPEND; |
| if (ip->i_d.di_flags & XFS_DIFLAG_SYNC) |
| inode->i_flags |= S_SYNC; |
| else |
| inode->i_flags &= ~S_SYNC; |
| if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME) |
| inode->i_flags |= S_NOATIME; |
| else |
| inode->i_flags &= ~S_NOATIME; |
| } |
| |
| /* |
| * Initialize the Linux inode, set up the operation vectors and |
| * unlock the inode. |
| * |
| * When reading existing inodes from disk this is called directly |
| * from xfs_iget, when creating a new inode it is called from |
| * xfs_ialloc after setting up the inode. |
| * |
| * We are always called with an uninitialised linux inode here. |
| * We need to initialise the necessary fields and take a reference |
| * on it. |
| */ |
| void |
| xfs_setup_inode( |
| struct xfs_inode *ip) |
| { |
| struct inode *inode = &ip->i_vnode; |
| |
| 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 */ |
| hlist_add_fake(&inode->i_hash); |
| |
| inode->i_mode = ip->i_d.di_mode; |
| set_nlink(inode, ip->i_d.di_nlink); |
| inode->i_uid = ip->i_d.di_uid; |
| inode->i_gid = ip->i_d.di_gid; |
| |
| switch (inode->i_mode & S_IFMT) { |
| case S_IFBLK: |
| case S_IFCHR: |
| inode->i_rdev = |
| MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff, |
| sysv_minor(ip->i_df.if_u2.if_rdev)); |
| break; |
| default: |
| inode->i_rdev = 0; |
| break; |
| } |
| |
| inode->i_generation = ip->i_d.di_gen; |
| i_size_write(inode, ip->i_d.di_size); |
| inode->i_atime.tv_sec = ip->i_d.di_atime.t_sec; |
| inode->i_atime.tv_nsec = ip->i_d.di_atime.t_nsec; |
| inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec; |
| inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec; |
| inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec; |
| inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec; |
| xfs_diflags_to_iflags(inode, ip); |
| |
| switch (inode->i_mode & S_IFMT) { |
| case S_IFREG: |
| inode->i_op = &xfs_inode_operations; |
| inode->i_fop = &xfs_file_operations; |
| inode->i_mapping->a_ops = &xfs_address_space_operations; |
| break; |
| case S_IFDIR: |
| if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_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; |
| if (!(ip->i_df.if_flags & XFS_IFINLINE)) |
| inode->i_mapping->a_ops = &xfs_address_space_operations; |
| break; |
| default: |
| inode->i_op = &xfs_inode_operations; |
| init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| break; |
| } |
| |
| /* |
| * 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); |
| } |
| |
| xfs_iflags_clear(ip, XFS_INEW); |
| barrier(); |
| |
| unlock_new_inode(inode); |
| } |