/* * 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_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 #include #include #include #include #include #include /* * 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) { struct inode *inode = VFS_I(ip); if (!(inode->i_state & I_CLEAR)) { ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec; ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec; } } /* * If the linux inode is valid, 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) { struct inode *inode = VFS_I(ip); if (!(inode->i_state & (I_WILL_FREE|I_FREEING|I_CLEAR))) mark_inode_dirty_sync(inode); } /* * 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. */ void xfs_ichgtime( xfs_inode_t *ip, int flags) { struct inode *inode = VFS_I(ip); timespec_t tv; int sync_it = 0; tv = current_fs_time(inode->i_sb); if ((flags & XFS_ICHGTIME_MOD) && !timespec_equal(&inode->i_mtime, &tv)) { 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; sync_it = 1; } if ((flags & XFS_ICHGTIME_CHG) && !timespec_equal(&inode->i_ctime, &tv)) { 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; sync_it = 1; } /* * 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. */ if (sync_it) { SYNCHRONIZE(); ip->i_update_core = 1; xfs_mark_inode_dirty_sync(ip); } } /* * 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) { struct xfs_inode *ip = XFS_I(inode); size_t length; void *value; char *name; int error; error = security_inode_init_security(inode, dir, &name, &value, &length); if (error) { if (error == -EOPNOTSUPP) return 0; return -error; } error = xfs_attr_set(ip, name, value, length, ATTR_SECURE); kfree(name); kfree(value); return error; } 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, int 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->fs->umask; } xfs_dentry_to_name(&name, dentry); error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip, NULL); if (unlikely(error)) goto out_free_acl; inode = VFS_I(ip); error = xfs_init_security(inode, dir); if (unlikely(error)) goto out_cleanup_inode; if (default_acl) { error = -xfs_inherit_acl(inode, default_acl); if (unlikely(error)) goto out_cleanup_inode; posix_acl_release(default_acl); } 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, 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) { 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, struct nameidata *nd) { 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; atomic_inc(&inode->i_count); 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; mode_t mode; mode = S_IFLNK | (irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO); xfs_dentry_to_name(&name, dentry); error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip, NULL); if (unlikely(error)) goto out; inode = VFS_I(cip); error = xfs_init_security(inode, dir); 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_permission( struct inode *inode, int mask) { return generic_permission(inode, mask, xfs_check_acl); } 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; 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 *iattr) { return -xfs_setattr(XFS_I(dentry->d_inode), iattr, 0); } /* * block_truncate_page can return an error, but we can't propagate it * at all here. Leave a complaint + stack trace in the syslog because * this could be bad. If it is bad, we need to propagate the error further. */ STATIC void xfs_vn_truncate( struct inode *inode) { int error; error = block_truncate_page(inode->i_mapping, inode->i_size, xfs_get_blocks); WARN_ON(error); } 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, XFS_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) { struct iattr iattr; iattr.ia_valid = ATTR_SIZE; iattr.ia_size = new_size; error = xfs_setattr(ip, &iattr, XFS_ATTR_NOLOCK); } xfs_iunlock(ip, XFS_IOLOCK_EXCL); out_error: return error; } #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); /* our formatter will tell xfs_getbmap when to stop. */ bm.bmv_count = MAXEXTNUM; bm.bmv_iflags = BMV_IF_PREALLOC; 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 = { .permission = xfs_vn_permission, .truncate = xfs_vn_truncate, .getattr = xfs_vn_getattr, .setattr = xfs_vn_setattr, .setxattr = generic_setxattr, .getxattr = generic_getxattr, .removexattr = generic_removexattr, .listxattr = xfs_vn_listxattr, .fallocate = xfs_vn_fallocate, .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, .permission = xfs_vn_permission, .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, .permission = xfs_vn_permission, .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, .permission = xfs_vn_permission, .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|I_LOCK; inode_add_to_lists(ip->i_mount->m_super, inode); inode->i_mode = ip->i_d.di_mode; inode->i_nlink = 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; } xfs_iflags_clear(ip, XFS_INEW); barrier(); unlock_new_inode(inode); }