/* * 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_bit.h" #include "xfs_log.h" #include "xfs_inum.h" #include "xfs_trans.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_dir2.h" #include "xfs_alloc.h" #include "xfs_dmapi.h" #include "xfs_quota.h" #include "xfs_mount.h" #include "xfs_bmap_btree.h" #include "xfs_alloc_btree.h" #include "xfs_ialloc_btree.h" #include "xfs_dir2_sf.h" #include "xfs_attr_sf.h" #include "xfs_dinode.h" #include "xfs_inode.h" #include "xfs_bmap.h" #include "xfs_btree.h" #include "xfs_ialloc.h" #include "xfs_rtalloc.h" #include "xfs_error.h" #include "xfs_itable.h" #include "xfs_rw.h" #include "xfs_acl.h" #include "xfs_attr.h" #include "xfs_buf_item.h" #include "xfs_utils.h" #include "xfs_vnodeops.h" #include <linux/capability.h> #include <linux/xattr.h> #include <linux/namei.h> #include <linux/security.h> #include <linux/falloc.h> /* * Bring the atime in the XFS inode uptodate. * Used before logging the inode to disk or when the Linux inode goes away. */ void xfs_synchronize_atime( xfs_inode_t *ip) { bhv_vnode_t *vp; vp = XFS_ITOV_NULL(ip); if (vp) { ip->i_d.di_atime.t_sec = (__int32_t)vp->i_atime.tv_sec; ip->i_d.di_atime.t_nsec = (__int32_t)vp->i_atime.tv_nsec; } } /* * If the linux inode exists, mark it dirty. * Used when commiting a dirty inode into a transaction so that * the inode will get written back by the linux code */ void xfs_mark_inode_dirty_sync( xfs_inode_t *ip) { bhv_vnode_t *vp; vp = XFS_ITOV_NULL(ip); if (vp) mark_inode_dirty_sync(vn_to_inode(vp)); } /* * Change the requested timestamp in the given inode. * We don't lock across timestamp updates, and we don't log them but * we do record the fact that there is dirty information in core. * * NOTE -- callers MUST combine XFS_ICHGTIME_MOD or XFS_ICHGTIME_CHG * with XFS_ICHGTIME_ACC to be sure that access time * update will take. Calling first with XFS_ICHGTIME_ACC * and then XFS_ICHGTIME_MOD may fail to modify the access * timestamp if the filesystem is mounted noacctm. */ void xfs_ichgtime( xfs_inode_t *ip, int flags) { struct inode *inode = vn_to_inode(XFS_ITOV(ip)); timespec_t tv; nanotime(&tv); if (flags & XFS_ICHGTIME_MOD) { inode->i_mtime = tv; ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec; ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec; } if (flags & XFS_ICHGTIME_ACC) { inode->i_atime = tv; ip->i_d.di_atime.t_sec = (__int32_t)tv.tv_sec; ip->i_d.di_atime.t_nsec = (__int32_t)tv.tv_nsec; } if (flags & XFS_ICHGTIME_CHG) { inode->i_ctime = tv; ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec; ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec; } /* * We update the i_update_core field _after_ changing * the timestamps in order to coordinate properly with * xfs_iflush() so that we don't lose timestamp updates. * This keeps us from having to hold the inode lock * while doing this. We use the SYNCHRONIZE macro to * ensure that the compiler does not reorder the update * of i_update_core above the timestamp updates above. */ SYNCHRONIZE(); ip->i_update_core = 1; if (!(inode->i_state & I_NEW)) mark_inode_dirty_sync(inode); } /* * Variant on the above which avoids querying the system clock * in situations where we know the Linux inode timestamps have * just been updated (and so we can update our inode cheaply). */ void xfs_ichgtime_fast( xfs_inode_t *ip, struct inode *inode, int flags) { timespec_t *tvp; /* * Atime updates for read() & friends are handled lazily now, and * explicit updates must go through xfs_ichgtime() */ ASSERT((flags & XFS_ICHGTIME_ACC) == 0); /* * We're not supposed to change timestamps in readonly-mounted * filesystems. Throw it away if anyone asks us. */ if (unlikely(IS_RDONLY(inode))) return; if (flags & XFS_ICHGTIME_MOD) { tvp = &inode->i_mtime; ip->i_d.di_mtime.t_sec = (__int32_t)tvp->tv_sec; ip->i_d.di_mtime.t_nsec = (__int32_t)tvp->tv_nsec; } if (flags & XFS_ICHGTIME_CHG) { tvp = &inode->i_ctime; ip->i_d.di_ctime.t_sec = (__int32_t)tvp->tv_sec; ip->i_d.di_ctime.t_nsec = (__int32_t)tvp->tv_nsec; } /* * We update the i_update_core field _after_ changing * the timestamps in order to coordinate properly with * xfs_iflush() so that we don't lose timestamp updates. * This keeps us from having to hold the inode lock * while doing this. We use the SYNCHRONIZE macro to * ensure that the compiler does not reorder the update * of i_update_core above the timestamp updates above. */ SYNCHRONIZE(); ip->i_update_core = 1; if (!(inode->i_state & I_NEW)) mark_inode_dirty_sync(inode); } /* * Pull the link count and size up from the xfs inode to the linux inode */ STATIC void xfs_validate_fields( struct inode *inode) { struct xfs_inode *ip = XFS_I(inode); loff_t size; /* we're under i_sem so i_size can't change under us */ size = XFS_ISIZE(ip); if (i_size_read(inode) != size) i_size_write(inode, size); } /* * 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( bhv_vnode_t *vp, struct inode *dir) { struct inode *ip = vn_to_inode(vp); size_t length; void *value; char *name; int error; error = security_inode_init_security(ip, dir, &name, &value, &length); if (error) { if (error == -EOPNOTSUPP) return 0; return -error; } error = xfs_attr_set(XFS_I(ip), name, value, length, ATTR_SECURE); if (!error) xfs_iflags_set(XFS_I(ip), XFS_IMODIFIED); kfree(name); kfree(value); return error; } /* * Determine whether a process has a valid fs_struct (kernel daemons * like knfsd don't have an fs_struct). * * XXX(hch): nfsd is broken, better fix it instead. */ STATIC_INLINE int xfs_has_fs_struct(struct task_struct *task) { return (task->fs != init_task.fs); } STATIC void xfs_cleanup_inode( struct inode *dir, bhv_vnode_t *vp, struct dentry *dentry, int mode) { struct dentry 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. */ teardown.d_inode = vn_to_inode(vp); teardown.d_name = dentry->d_name; if (S_ISDIR(mode)) xfs_rmdir(XFS_I(dir), &teardown); else xfs_remove(XFS_I(dir), &teardown); VN_RELE(vp); } STATIC int xfs_vn_mknod( struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) { struct inode *ip; bhv_vnode_t *vp = NULL, *dvp = vn_from_inode(dir); xfs_acl_t *default_acl = NULL; attrexists_t test_default_acl = _ACL_DEFAULT_EXISTS; int error; /* * Irix uses Missed'em'V split, but doesn't want to see * the upper 5 bits of (14bit) major. */ if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff)) return -EINVAL; if (unlikely(test_default_acl && test_default_acl(dvp))) { if (!_ACL_ALLOC(default_acl)) { return -ENOMEM; } if (!_ACL_GET_DEFAULT(dvp, default_acl)) { _ACL_FREE(default_acl); default_acl = NULL; } } if (IS_POSIXACL(dir) && !default_acl && xfs_has_fs_struct(current)) mode &= ~current->fs->umask; switch (mode & S_IFMT) { case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK: rdev = sysv_encode_dev(rdev); case S_IFREG: error = xfs_create(XFS_I(dir), dentry, mode, rdev, &vp, NULL); break; case S_IFDIR: error = xfs_mkdir(XFS_I(dir), dentry, mode, &vp, NULL); break; default: error = EINVAL; break; } if (unlikely(!error)) { error = xfs_init_security(vp, dir); if (error) xfs_cleanup_inode(dir, vp, dentry, mode); } if (unlikely(default_acl)) { if (!error) { error = _ACL_INHERIT(vp, mode, default_acl); if (!error) xfs_iflags_set(XFS_I(vp), XFS_IMODIFIED); else xfs_cleanup_inode(dir, vp, dentry, mode); } _ACL_FREE(default_acl); } if (likely(!error)) { ASSERT(vp); ip = vn_to_inode(vp); if (S_ISDIR(mode)) xfs_validate_fields(ip); d_instantiate(dentry, ip); xfs_validate_fields(dir); } return -error; } STATIC int xfs_vn_create( struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) { return xfs_vn_mknod(dir, dentry, mode, 0); } STATIC int xfs_vn_mkdir( struct inode *dir, struct dentry *dentry, int mode) { return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0); } STATIC struct dentry * xfs_vn_lookup( struct inode *dir, struct dentry *dentry, struct nameidata *nd) { bhv_vnode_t *cvp; int error; if (dentry->d_name.len >= MAXNAMELEN) return ERR_PTR(-ENAMETOOLONG); error = xfs_lookup(XFS_I(dir), dentry, &cvp); if (unlikely(error)) { if (unlikely(error != ENOENT)) return ERR_PTR(-error); d_add(dentry, NULL); return NULL; } return d_splice_alias(vn_to_inode(cvp), dentry); } STATIC int xfs_vn_link( struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { struct inode *ip; /* inode of guy being linked to */ bhv_vnode_t *vp; /* vp of name being linked */ int error; ip = old_dentry->d_inode; /* inode being linked to */ vp = vn_from_inode(ip); VN_HOLD(vp); error = xfs_link(XFS_I(dir), vp, dentry); if (unlikely(error)) { VN_RELE(vp); } else { xfs_iflags_set(XFS_I(dir), XFS_IMODIFIED); xfs_validate_fields(ip); d_instantiate(dentry, ip); } return -error; } STATIC int xfs_vn_unlink( struct inode *dir, struct dentry *dentry) { struct inode *inode; int error; inode = dentry->d_inode; error = xfs_remove(XFS_I(dir), dentry); if (likely(!error)) { xfs_validate_fields(dir); /* size needs update */ xfs_validate_fields(inode); } return -error; } STATIC int xfs_vn_symlink( struct inode *dir, struct dentry *dentry, const char *symname) { struct inode *ip; bhv_vnode_t *cvp; /* used to lookup symlink to put in dentry */ int error; mode_t mode; cvp = NULL; mode = S_IFLNK | (irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO); error = xfs_symlink(XFS_I(dir), dentry, (char *)symname, mode, &cvp, NULL); if (likely(!error && cvp)) { error = xfs_init_security(cvp, dir); if (likely(!error)) { ip = vn_to_inode(cvp); d_instantiate(dentry, ip); xfs_validate_fields(dir); xfs_validate_fields(ip); } else { xfs_cleanup_inode(dir, cvp, dentry, 0); } } return -error; } STATIC int xfs_vn_rmdir( struct inode *dir, struct dentry *dentry) { struct inode *inode = dentry->d_inode; int error; error = xfs_rmdir(XFS_I(dir), dentry); if (likely(!error)) { xfs_validate_fields(inode); xfs_validate_fields(dir); } 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; bhv_vnode_t *tvp; /* target directory */ int error; tvp = vn_from_inode(ndir); error = xfs_rename(XFS_I(odir), odentry, tvp, ndentry); if (likely(!error)) { if (new_inode) xfs_validate_fields(new_inode); xfs_validate_fields(odir); if (ndir != odir) xfs_validate_fields(ndir); } return -error; } /* * 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); } #ifdef CONFIG_XFS_POSIX_ACL STATIC int xfs_check_acl( struct inode *inode, int mask) { struct xfs_inode *ip = XFS_I(inode); int error; xfs_itrace_entry(ip); if (XFS_IFORK_Q(ip)) { error = xfs_acl_iaccess(ip, mask, NULL); if (error != -1) return -error; } return -EAGAIN; } STATIC int xfs_vn_permission( struct inode *inode, int mask, struct nameidata *nd) { return generic_permission(inode, mask, xfs_check_acl); } #else #define xfs_vn_permission NULL #endif 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; xfs_itrace_entry(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; #if XFS_BIG_INUMS stat->ino += mp->m_inoadd; #endif stat->atime = inode->i_atime; stat->mtime.tv_sec = ip->i_d.di_mtime.t_sec; stat->mtime.tv_nsec = ip->i_d.di_mtime.t_nsec; stat->ctime.tv_sec = ip->i_d.di_ctime.t_sec; stat->ctime.tv_nsec = ip->i_d.di_ctime.t_nsec; 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; } STATIC int xfs_vn_setattr( struct dentry *dentry, struct iattr *attr) { struct inode *inode = dentry->d_inode; unsigned int ia_valid = attr->ia_valid; bhv_vattr_t vattr = { 0 }; int flags = 0; int error; if (ia_valid & ATTR_UID) { vattr.va_mask |= XFS_AT_UID; vattr.va_uid = attr->ia_uid; } if (ia_valid & ATTR_GID) { vattr.va_mask |= XFS_AT_GID; vattr.va_gid = attr->ia_gid; } if (ia_valid & ATTR_SIZE) { vattr.va_mask |= XFS_AT_SIZE; vattr.va_size = attr->ia_size; } if (ia_valid & ATTR_ATIME) { vattr.va_mask |= XFS_AT_ATIME; vattr.va_atime = attr->ia_atime; inode->i_atime = attr->ia_atime; } if (ia_valid & ATTR_MTIME) { vattr.va_mask |= XFS_AT_MTIME; vattr.va_mtime = attr->ia_mtime; } if (ia_valid & ATTR_CTIME) { vattr.va_mask |= XFS_AT_CTIME; vattr.va_ctime = attr->ia_ctime; } if (ia_valid & ATTR_MODE) { vattr.va_mask |= XFS_AT_MODE; vattr.va_mode = attr->ia_mode; if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) inode->i_mode &= ~S_ISGID; } if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) flags |= ATTR_UTIME; #ifdef ATTR_NO_BLOCK if ((ia_valid & ATTR_NO_BLOCK)) flags |= ATTR_NONBLOCK; #endif error = xfs_setattr(XFS_I(inode), &vattr, flags, NULL); if (likely(!error)) vn_revalidate(vn_from_inode(inode)); return -error; } STATIC void xfs_vn_truncate( struct inode *inode) { block_truncate_page(inode->i_mapping, inode->i_size, xfs_get_blocks); } STATIC int xfs_vn_setxattr( struct dentry *dentry, const char *name, const void *data, size_t size, int flags) { bhv_vnode_t *vp = vn_from_inode(dentry->d_inode); char *attr = (char *)name; attrnames_t *namesp; int xflags = 0; int error; namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT); if (!namesp) return -EOPNOTSUPP; attr += namesp->attr_namelen; error = namesp->attr_capable(vp, NULL); if (error) return error; /* Convert Linux syscall to XFS internal ATTR flags */ if (flags & XATTR_CREATE) xflags |= ATTR_CREATE; if (flags & XATTR_REPLACE) xflags |= ATTR_REPLACE; xflags |= namesp->attr_flag; return namesp->attr_set(vp, attr, (void *)data, size, xflags); } STATIC ssize_t xfs_vn_getxattr( struct dentry *dentry, const char *name, void *data, size_t size) { bhv_vnode_t *vp = vn_from_inode(dentry->d_inode); char *attr = (char *)name; attrnames_t *namesp; int xflags = 0; ssize_t error; namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT); if (!namesp) return -EOPNOTSUPP; attr += namesp->attr_namelen; error = namesp->attr_capable(vp, NULL); if (error) return error; /* Convert Linux syscall to XFS internal ATTR flags */ if (!size) { xflags |= ATTR_KERNOVAL; data = NULL; } xflags |= namesp->attr_flag; return namesp->attr_get(vp, attr, (void *)data, size, xflags); } STATIC ssize_t xfs_vn_listxattr( struct dentry *dentry, char *data, size_t size) { bhv_vnode_t *vp = vn_from_inode(dentry->d_inode); int error, xflags = ATTR_KERNAMELS; ssize_t result; if (!size) xflags |= ATTR_KERNOVAL; xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS; error = attr_generic_list(vp, data, size, xflags, &result); if (error < 0) return error; return result; } STATIC int xfs_vn_removexattr( struct dentry *dentry, const char *name) { bhv_vnode_t *vp = vn_from_inode(dentry->d_inode); char *attr = (char *)name; attrnames_t *namesp; int xflags = 0; int error; namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT); if (!namesp) return -EOPNOTSUPP; attr += namesp->attr_namelen; error = namesp->attr_capable(vp, NULL); if (error) return error; xflags |= namesp->attr_flag; return namesp->attr_remove(vp, attr, xflags); } STATIC long xfs_vn_fallocate( struct inode *inode, int mode, loff_t offset, loff_t len) { long error; loff_t new_size = 0; xfs_flock64_t bf; xfs_inode_t *ip = XFS_I(inode); /* preallocation on directories not yet supported */ error = -ENODEV; if (S_ISDIR(inode->i_mode)) goto out_error; bf.l_whence = 0; bf.l_start = offset; bf.l_len = len; xfs_ilock(ip, XFS_IOLOCK_EXCL); error = xfs_change_file_space(ip, XFS_IOC_RESVSP, &bf, 0, NULL, ATTR_NOLOCK); if (!error && !(mode & FALLOC_FL_KEEP_SIZE) && offset + len > i_size_read(inode)) new_size = offset + len; /* Change file size if needed */ if (new_size) { bhv_vattr_t va; va.va_mask = XFS_AT_SIZE; va.va_size = new_size; error = xfs_setattr(ip, &va, ATTR_NOLOCK, NULL); } xfs_iunlock(ip, XFS_IOLOCK_EXCL); out_error: return error; } const struct inode_operations xfs_inode_operations = { .permission = xfs_vn_permission, .truncate = xfs_vn_truncate, .getattr = xfs_vn_getattr, .setattr = xfs_vn_setattr, .setxattr = xfs_vn_setxattr, .getxattr = xfs_vn_getxattr, .listxattr = xfs_vn_listxattr, .removexattr = xfs_vn_removexattr, .fallocate = xfs_vn_fallocate, }; 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, .rmdir = xfs_vn_rmdir, .mknod = xfs_vn_mknod, .rename = xfs_vn_rename, .permission = xfs_vn_permission, .getattr = xfs_vn_getattr, .setattr = xfs_vn_setattr, .setxattr = xfs_vn_setxattr, .getxattr = xfs_vn_getxattr, .listxattr = xfs_vn_listxattr, .removexattr = xfs_vn_removexattr, }; const struct inode_operations xfs_symlink_inode_operations = { .readlink = generic_readlink, .follow_link = xfs_vn_follow_link, .put_link = xfs_vn_put_link, .permission = xfs_vn_permission, .getattr = xfs_vn_getattr, .setattr = xfs_vn_setattr, .setxattr = xfs_vn_setxattr, .getxattr = xfs_vn_getxattr, .listxattr = xfs_vn_listxattr, .removexattr = xfs_vn_removexattr, };