diff options
Diffstat (limited to 'fs/aufs/cpup.c')
| -rw-r--r-- | fs/aufs/cpup.c | 1319 |
1 files changed, 0 insertions, 1319 deletions
diff --git a/fs/aufs/cpup.c b/fs/aufs/cpup.c deleted file mode 100644 index 3ea177a5d..000000000 --- a/fs/aufs/cpup.c +++ /dev/null @@ -1,1319 +0,0 @@ -/* - * Copyright (C) 2005-2015 Junjiro R. Okajima - * - * This program, aufs 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; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will 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, see <http://www.gnu.org/licenses/>. - */ - -/* - * copy-up functions, see wbr_policy.c for copy-down - */ - -#include <linux/fs_stack.h> -#include <linux/mm.h> -#include "aufs.h" - -void au_cpup_attr_flags(struct inode *dst, unsigned int iflags) -{ - const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE - | S_NOATIME | S_NOCMTIME | S_AUTOMOUNT; - - BUILD_BUG_ON(sizeof(iflags) != sizeof(dst->i_flags)); - - dst->i_flags |= iflags & ~mask; - if (au_test_fs_notime(dst->i_sb)) - dst->i_flags |= S_NOATIME | S_NOCMTIME; -} - -void au_cpup_attr_timesizes(struct inode *inode) -{ - struct inode *h_inode; - - h_inode = au_h_iptr(inode, au_ibstart(inode)); - fsstack_copy_attr_times(inode, h_inode); - fsstack_copy_inode_size(inode, h_inode); -} - -void au_cpup_attr_nlink(struct inode *inode, int force) -{ - struct inode *h_inode; - struct super_block *sb; - aufs_bindex_t bindex, bend; - - sb = inode->i_sb; - bindex = au_ibstart(inode); - h_inode = au_h_iptr(inode, bindex); - if (!force - && !S_ISDIR(h_inode->i_mode) - && au_opt_test(au_mntflags(sb), PLINK) - && au_plink_test(inode)) - return; - - /* - * 0 can happen in revalidating. - * h_inode->i_mutex may not be held here, but it is harmless since once - * i_nlink reaches 0, it will never become positive except O_TMPFILE - * case. - * todo: O_TMPFILE+linkat(AT_SYMLINK_FOLLOW) bypassing aufs may cause - * the incorrect link count. - */ - set_nlink(inode, h_inode->i_nlink); - - /* - * fewer nlink makes find(1) noisy, but larger nlink doesn't. - * it may includes whplink directory. - */ - if (S_ISDIR(h_inode->i_mode)) { - bend = au_ibend(inode); - for (bindex++; bindex <= bend; bindex++) { - h_inode = au_h_iptr(inode, bindex); - if (h_inode) - au_add_nlink(inode, h_inode); - } - } -} - -void au_cpup_attr_changeable(struct inode *inode) -{ - struct inode *h_inode; - - h_inode = au_h_iptr(inode, au_ibstart(inode)); - inode->i_mode = h_inode->i_mode; - inode->i_uid = h_inode->i_uid; - inode->i_gid = h_inode->i_gid; - au_cpup_attr_timesizes(inode); - au_cpup_attr_flags(inode, h_inode->i_flags); -} - -void au_cpup_igen(struct inode *inode, struct inode *h_inode) -{ - struct au_iinfo *iinfo = au_ii(inode); - - IiMustWriteLock(inode); - - iinfo->ii_higen = h_inode->i_generation; - iinfo->ii_hsb1 = h_inode->i_sb; -} - -void au_cpup_attr_all(struct inode *inode, int force) -{ - struct inode *h_inode; - - h_inode = au_h_iptr(inode, au_ibstart(inode)); - au_cpup_attr_changeable(inode); - if (inode->i_nlink > 0) - au_cpup_attr_nlink(inode, force); - inode->i_rdev = h_inode->i_rdev; - inode->i_blkbits = h_inode->i_blkbits; - au_cpup_igen(inode, h_inode); -} - -/* ---------------------------------------------------------------------- */ - -/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */ - -/* keep the timestamps of the parent dir when cpup */ -void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, - struct path *h_path) -{ - struct inode *h_inode; - - dt->dt_dentry = dentry; - dt->dt_h_path = *h_path; - h_inode = d_inode(h_path->dentry); - dt->dt_atime = h_inode->i_atime; - dt->dt_mtime = h_inode->i_mtime; - /* smp_mb(); */ -} - -void au_dtime_revert(struct au_dtime *dt) -{ - struct iattr attr; - int err; - - attr.ia_atime = dt->dt_atime; - attr.ia_mtime = dt->dt_mtime; - attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET - | ATTR_ATIME | ATTR_ATIME_SET; - - /* no delegation since this is a directory */ - err = vfsub_notify_change(&dt->dt_h_path, &attr, /*delegated*/NULL); - if (unlikely(err)) - pr_warn("restoring timestamps failed(%d). ignored\n", err); -} - -/* ---------------------------------------------------------------------- */ - -/* internal use only */ -struct au_cpup_reg_attr { - int valid; - struct kstat st; - unsigned int iflags; /* inode->i_flags */ -}; - -static noinline_for_stack -int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src, - struct au_cpup_reg_attr *h_src_attr) -{ - int err, sbits, icex; - unsigned int mnt_flags; - unsigned char verbose; - struct iattr ia; - struct path h_path; - struct inode *h_isrc, *h_idst; - struct kstat *h_st; - struct au_branch *br; - - h_path.dentry = au_h_dptr(dst, bindex); - h_idst = d_inode(h_path.dentry); - br = au_sbr(dst->d_sb, bindex); - h_path.mnt = au_br_mnt(br); - h_isrc = d_inode(h_src); - ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID - | ATTR_ATIME | ATTR_MTIME - | ATTR_ATIME_SET | ATTR_MTIME_SET; - if (h_src_attr && h_src_attr->valid) { - h_st = &h_src_attr->st; - ia.ia_uid = h_st->uid; - ia.ia_gid = h_st->gid; - ia.ia_atime = h_st->atime; - ia.ia_mtime = h_st->mtime; - if (h_idst->i_mode != h_st->mode - && !S_ISLNK(h_idst->i_mode)) { - ia.ia_valid |= ATTR_MODE; - ia.ia_mode = h_st->mode; - } - sbits = !!(h_st->mode & (S_ISUID | S_ISGID)); - au_cpup_attr_flags(h_idst, h_src_attr->iflags); - } else { - ia.ia_uid = h_isrc->i_uid; - ia.ia_gid = h_isrc->i_gid; - ia.ia_atime = h_isrc->i_atime; - ia.ia_mtime = h_isrc->i_mtime; - if (h_idst->i_mode != h_isrc->i_mode - && !S_ISLNK(h_idst->i_mode)) { - ia.ia_valid |= ATTR_MODE; - ia.ia_mode = h_isrc->i_mode; - } - sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID)); - au_cpup_attr_flags(h_idst, h_isrc->i_flags); - } - /* no delegation since it is just created */ - err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL); - - /* is this nfs only? */ - if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) { - ia.ia_valid = ATTR_FORCE | ATTR_MODE; - ia.ia_mode = h_isrc->i_mode; - err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL); - } - - icex = br->br_perm & AuBrAttr_ICEX; - if (!err) { - mnt_flags = au_mntflags(dst->d_sb); - verbose = !!au_opt_test(mnt_flags, VERBOSE); - err = au_cpup_xattr(h_path.dentry, h_src, icex, verbose); - } - - return err; -} - -/* ---------------------------------------------------------------------- */ - -static int au_do_copy_file(struct file *dst, struct file *src, loff_t len, - char *buf, unsigned long blksize) -{ - int err; - size_t sz, rbytes, wbytes; - unsigned char all_zero; - char *p, *zp; - struct mutex *h_mtx; - /* reduce stack usage */ - struct iattr *ia; - - zp = page_address(ZERO_PAGE(0)); - if (unlikely(!zp)) - return -ENOMEM; /* possible? */ - - err = 0; - all_zero = 0; - while (len) { - AuDbg("len %lld\n", len); - sz = blksize; - if (len < blksize) - sz = len; - - rbytes = 0; - /* todo: signal_pending? */ - while (!rbytes || err == -EAGAIN || err == -EINTR) { - rbytes = vfsub_read_k(src, buf, sz, &src->f_pos); - err = rbytes; - } - if (unlikely(err < 0)) - break; - - all_zero = 0; - if (len >= rbytes && rbytes == blksize) - all_zero = !memcmp(buf, zp, rbytes); - if (!all_zero) { - wbytes = rbytes; - p = buf; - while (wbytes) { - size_t b; - - b = vfsub_write_k(dst, p, wbytes, &dst->f_pos); - err = b; - /* todo: signal_pending? */ - if (unlikely(err == -EAGAIN || err == -EINTR)) - continue; - if (unlikely(err < 0)) - break; - wbytes -= b; - p += b; - } - if (unlikely(err < 0)) - break; - } else { - loff_t res; - - AuLabel(hole); - res = vfsub_llseek(dst, rbytes, SEEK_CUR); - err = res; - if (unlikely(res < 0)) - break; - } - len -= rbytes; - err = 0; - } - - /* the last block may be a hole */ - if (!err && all_zero) { - AuLabel(last hole); - - err = 1; - if (au_test_nfs(dst->f_path.dentry->d_sb)) { - /* nfs requires this step to make last hole */ - /* is this only nfs? */ - do { - /* todo: signal_pending? */ - err = vfsub_write_k(dst, "\0", 1, &dst->f_pos); - } while (err == -EAGAIN || err == -EINTR); - if (err == 1) - dst->f_pos--; - } - - if (err == 1) { - ia = (void *)buf; - ia->ia_size = dst->f_pos; - ia->ia_valid = ATTR_SIZE | ATTR_FILE; - ia->ia_file = dst; - h_mtx = &file_inode(dst)->i_mutex; - mutex_lock_nested(h_mtx, AuLsc_I_CHILD2); - /* no delegation since it is just created */ - err = vfsub_notify_change(&dst->f_path, ia, - /*delegated*/NULL); - mutex_unlock(h_mtx); - } - } - - return err; -} - -int au_copy_file(struct file *dst, struct file *src, loff_t len) -{ - int err; - unsigned long blksize; - unsigned char do_kfree; - char *buf; - - err = -ENOMEM; - blksize = dst->f_path.dentry->d_sb->s_blocksize; - if (!blksize || PAGE_SIZE < blksize) - blksize = PAGE_SIZE; - AuDbg("blksize %lu\n", blksize); - do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *)); - if (do_kfree) - buf = kmalloc(blksize, GFP_NOFS); - else - buf = (void *)__get_free_page(GFP_NOFS); - if (unlikely(!buf)) - goto out; - - if (len > (1 << 22)) - AuDbg("copying a large file %lld\n", (long long)len); - - src->f_pos = 0; - dst->f_pos = 0; - err = au_do_copy_file(dst, src, len, buf, blksize); - if (do_kfree) - kfree(buf); - else - free_page((unsigned long)buf); - -out: - return err; -} - -/* - * to support a sparse file which is opened with O_APPEND, - * we need to close the file. - */ -static int au_cp_regular(struct au_cp_generic *cpg) -{ - int err, i; - enum { SRC, DST }; - struct { - aufs_bindex_t bindex; - unsigned int flags; - struct dentry *dentry; - int force_wr; - struct file *file; - void *label; - } *f, file[] = { - { - .bindex = cpg->bsrc, - .flags = O_RDONLY | O_NOATIME | O_LARGEFILE, - .label = &&out - }, - { - .bindex = cpg->bdst, - .flags = O_WRONLY | O_NOATIME | O_LARGEFILE, - .force_wr = !!au_ftest_cpup(cpg->flags, RWDST), - .label = &&out_src - } - }; - struct super_block *sb; - - /* bsrc branch can be ro/rw. */ - sb = cpg->dentry->d_sb; - f = file; - for (i = 0; i < 2; i++, f++) { - f->dentry = au_h_dptr(cpg->dentry, f->bindex); - f->file = au_h_open(cpg->dentry, f->bindex, f->flags, - /*file*/NULL, f->force_wr); - err = PTR_ERR(f->file); - if (IS_ERR(f->file)) - goto *f->label; - } - - /* try stopping to update while we copyup */ - IMustLock(d_inode(file[SRC].dentry)); - err = au_copy_file(file[DST].file, file[SRC].file, cpg->len); - - fput(file[DST].file); - au_sbr_put(sb, file[DST].bindex); - -out_src: - fput(file[SRC].file); - au_sbr_put(sb, file[SRC].bindex); -out: - return err; -} - -static int au_do_cpup_regular(struct au_cp_generic *cpg, - struct au_cpup_reg_attr *h_src_attr) -{ - int err, rerr; - loff_t l; - struct path h_path; - struct inode *h_src_inode, *h_dst_inode; - - err = 0; - h_src_inode = au_h_iptr(d_inode(cpg->dentry), cpg->bsrc); - l = i_size_read(h_src_inode); - if (cpg->len == -1 || l < cpg->len) - cpg->len = l; - if (cpg->len) { - /* try stopping to update while we are referencing */ - mutex_lock_nested(&h_src_inode->i_mutex, AuLsc_I_CHILD); - au_pin_hdir_unlock(cpg->pin); - - h_path.dentry = au_h_dptr(cpg->dentry, cpg->bsrc); - h_path.mnt = au_sbr_mnt(cpg->dentry->d_sb, cpg->bsrc); - h_src_attr->iflags = h_src_inode->i_flags; - if (!au_test_nfs(h_src_inode->i_sb)) - err = vfs_getattr(&h_path, &h_src_attr->st); - else { - mutex_unlock(&h_src_inode->i_mutex); - err = vfs_getattr(&h_path, &h_src_attr->st); - mutex_lock_nested(&h_src_inode->i_mutex, AuLsc_I_CHILD); - } - if (unlikely(err)) { - mutex_unlock(&h_src_inode->i_mutex); - goto out; - } - h_src_attr->valid = 1; - err = au_cp_regular(cpg); - mutex_unlock(&h_src_inode->i_mutex); - rerr = au_pin_hdir_relock(cpg->pin); - if (!err && rerr) - err = rerr; - } - if (!err && (h_src_inode->i_state & I_LINKABLE)) { - h_path.dentry = au_h_dptr(cpg->dentry, cpg->bdst); - h_dst_inode = d_inode(h_path.dentry); - spin_lock(&h_dst_inode->i_lock); - h_dst_inode->i_state |= I_LINKABLE; - spin_unlock(&h_dst_inode->i_lock); - } - -out: - return err; -} - -static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src, - struct inode *h_dir) -{ - int err, symlen; - mm_segment_t old_fs; - union { - char *k; - char __user *u; - } sym; - struct inode *h_inode = d_inode(h_src); - const struct inode_operations *h_iop = h_inode->i_op; - - err = -ENOSYS; - if (unlikely(!h_iop->readlink)) - goto out; - - err = -ENOMEM; - sym.k = (void *)__get_free_page(GFP_NOFS); - if (unlikely(!sym.k)) - goto out; - - /* unnecessary to support mmap_sem since symlink is not mmap-able */ - old_fs = get_fs(); - set_fs(KERNEL_DS); - symlen = h_iop->readlink(h_src, sym.u, PATH_MAX); - err = symlen; - set_fs(old_fs); - - if (symlen > 0) { - sym.k[symlen] = 0; - err = vfsub_symlink(h_dir, h_path, sym.k); - } - free_page((unsigned long)sym.k); - -out: - return err; -} - -static noinline_for_stack -int cpup_entry(struct au_cp_generic *cpg, struct dentry *dst_parent, - struct au_cpup_reg_attr *h_src_attr) -{ - int err; - umode_t mode; - unsigned int mnt_flags; - unsigned char isdir, isreg, force; - const unsigned char do_dt = !!au_ftest_cpup(cpg->flags, DTIME); - struct au_dtime dt; - struct path h_path; - struct dentry *h_src, *h_dst, *h_parent; - struct inode *h_inode, *h_dir, *dir, *inode; - struct super_block *sb; - - /* bsrc branch can be ro/rw. */ - h_src = au_h_dptr(cpg->dentry, cpg->bsrc); - h_inode = d_inode(h_src); - AuDebugOn(h_inode != au_h_iptr(d_inode(cpg->dentry), cpg->bsrc)); - - /* try stopping to be referenced while we are creating */ - h_dst = au_h_dptr(cpg->dentry, cpg->bdst); - if (au_ftest_cpup(cpg->flags, RENAME)) - AuDebugOn(strncmp(h_dst->d_name.name, AUFS_WH_PFX, - AUFS_WH_PFX_LEN)); - h_parent = h_dst->d_parent; /* dir inode is locked */ - h_dir = d_inode(h_parent); - IMustLock(h_dir); - AuDebugOn(h_parent != h_dst->d_parent); - - sb = cpg->dentry->d_sb; - h_path.mnt = au_sbr_mnt(sb, cpg->bdst); - if (do_dt) { - h_path.dentry = h_parent; - au_dtime_store(&dt, dst_parent, &h_path); - } - h_path.dentry = h_dst; - - isreg = 0; - isdir = 0; - mode = h_inode->i_mode; - switch (mode & S_IFMT) { - case S_IFREG: - isreg = 1; - err = vfsub_create(h_dir, &h_path, mode | S_IWUSR, - /*want_excl*/true); - if (!err) - err = au_do_cpup_regular(cpg, h_src_attr); - break; - case S_IFDIR: - isdir = 1; - err = vfsub_mkdir(h_dir, &h_path, mode); - if (!err) { - /* - * strange behaviour from the users view, - * particularry setattr case - */ - dir = d_inode(dst_parent); - if (au_ibstart(dir) == cpg->bdst) - au_cpup_attr_nlink(dir, /*force*/1); - inode = d_inode(cpg->dentry); - au_cpup_attr_nlink(inode, /*force*/1); - } - break; - case S_IFLNK: - err = au_do_cpup_symlink(&h_path, h_src, h_dir); - break; - case S_IFCHR: - case S_IFBLK: - AuDebugOn(!capable(CAP_MKNOD)); - /*FALLTHROUGH*/ - case S_IFIFO: - case S_IFSOCK: - err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev); - break; - default: - AuIOErr("Unknown inode type 0%o\n", mode); - err = -EIO; - } - - mnt_flags = au_mntflags(sb); - if (!au_opt_test(mnt_flags, UDBA_NONE) - && !isdir - && au_opt_test(mnt_flags, XINO) - && (h_inode->i_nlink == 1 - || (h_inode->i_state & I_LINKABLE)) - /* todo: unnecessary? */ - /* && d_inode(cpg->dentry)->i_nlink == 1 */ - && cpg->bdst < cpg->bsrc - && !au_ftest_cpup(cpg->flags, KEEPLINO)) - au_xino_write(sb, cpg->bsrc, h_inode->i_ino, /*ino*/0); - /* ignore this error */ - - if (!err) { - force = 0; - if (isreg) { - force = !!cpg->len; - if (cpg->len == -1) - force = !!i_size_read(h_inode); - } - au_fhsm_wrote(sb, cpg->bdst, force); - } - - if (do_dt) - au_dtime_revert(&dt); - return err; -} - -static int au_do_ren_after_cpup(struct au_cp_generic *cpg, struct path *h_path) -{ - int err; - struct dentry *dentry, *h_dentry, *h_parent, *parent; - struct inode *h_dir; - aufs_bindex_t bdst; - - dentry = cpg->dentry; - bdst = cpg->bdst; - h_dentry = au_h_dptr(dentry, bdst); - if (!au_ftest_cpup(cpg->flags, OVERWRITE)) { - dget(h_dentry); - au_set_h_dptr(dentry, bdst, NULL); - err = au_lkup_neg(dentry, bdst, /*wh*/0); - if (!err) - h_path->dentry = dget(au_h_dptr(dentry, bdst)); - au_set_h_dptr(dentry, bdst, h_dentry); - } else { - err = 0; - parent = dget_parent(dentry); - h_parent = au_h_dptr(parent, bdst); - dput(parent); - h_path->dentry = vfsub_lkup_one(&dentry->d_name, h_parent); - if (IS_ERR(h_path->dentry)) - err = PTR_ERR(h_path->dentry); - } - if (unlikely(err)) - goto out; - - h_parent = h_dentry->d_parent; /* dir inode is locked */ - h_dir = d_inode(h_parent); - IMustLock(h_dir); - AuDbg("%pd %pd\n", h_dentry, h_path->dentry); - /* no delegation since it is just created */ - err = vfsub_rename(h_dir, h_dentry, h_dir, h_path, /*delegated*/NULL); - dput(h_path->dentry); - -out: - return err; -} - -/* - * copyup the @dentry from @bsrc to @bdst. - * the caller must set the both of lower dentries. - * @len is for truncating when it is -1 copyup the entire file. - * in link/rename cases, @dst_parent may be different from the real one. - * basic->bsrc can be larger than basic->bdst. - */ -static int au_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent) -{ - int err, rerr; - aufs_bindex_t old_ibstart; - unsigned char isdir, plink; - struct dentry *h_src, *h_dst, *h_parent; - struct inode *dst_inode, *h_dir, *inode, *delegated, *src_inode; - struct super_block *sb; - struct au_branch *br; - /* to reuduce stack size */ - struct { - struct au_dtime dt; - struct path h_path; - struct au_cpup_reg_attr h_src_attr; - } *a; - - err = -ENOMEM; - a = kmalloc(sizeof(*a), GFP_NOFS); - if (unlikely(!a)) - goto out; - a->h_src_attr.valid = 0; - - sb = cpg->dentry->d_sb; - br = au_sbr(sb, cpg->bdst); - a->h_path.mnt = au_br_mnt(br); - h_dst = au_h_dptr(cpg->dentry, cpg->bdst); - h_parent = h_dst->d_parent; /* dir inode is locked */ - h_dir = d_inode(h_parent); - IMustLock(h_dir); - - h_src = au_h_dptr(cpg->dentry, cpg->bsrc); - inode = d_inode(cpg->dentry); - - if (!dst_parent) - dst_parent = dget_parent(cpg->dentry); - else - dget(dst_parent); - - plink = !!au_opt_test(au_mntflags(sb), PLINK); - dst_inode = au_h_iptr(inode, cpg->bdst); - if (dst_inode) { - if (unlikely(!plink)) { - err = -EIO; - AuIOErr("hi%lu(i%lu) exists on b%d " - "but plink is disabled\n", - dst_inode->i_ino, inode->i_ino, cpg->bdst); - goto out_parent; - } - - if (dst_inode->i_nlink) { - const int do_dt = au_ftest_cpup(cpg->flags, DTIME); - - h_src = au_plink_lkup(inode, cpg->bdst); - err = PTR_ERR(h_src); - if (IS_ERR(h_src)) - goto out_parent; - if (unlikely(d_is_negative(h_src))) { - err = -EIO; - AuIOErr("i%lu exists on a upper branch " - "but not pseudo-linked\n", - inode->i_ino); - dput(h_src); - goto out_parent; - } - - if (do_dt) { - a->h_path.dentry = h_parent; - au_dtime_store(&a->dt, dst_parent, &a->h_path); - } - - a->h_path.dentry = h_dst; - delegated = NULL; - err = vfsub_link(h_src, h_dir, &a->h_path, &delegated); - if (!err && au_ftest_cpup(cpg->flags, RENAME)) - err = au_do_ren_after_cpup(cpg, &a->h_path); - if (do_dt) - au_dtime_revert(&a->dt); - if (unlikely(err == -EWOULDBLOCK)) { - pr_warn("cannot retry for NFSv4 delegation" - " for an internal link\n"); - iput(delegated); - } - dput(h_src); - goto out_parent; - } else - /* todo: cpup_wh_file? */ - /* udba work */ - au_update_ibrange(inode, /*do_put_zero*/1); - } - - isdir = S_ISDIR(inode->i_mode); - old_ibstart = au_ibstart(inode); - err = cpup_entry(cpg, dst_parent, &a->h_src_attr); - if (unlikely(err)) - goto out_rev; - dst_inode = d_inode(h_dst); - mutex_lock_nested(&dst_inode->i_mutex, AuLsc_I_CHILD2); - /* todo: necessary? */ - /* au_pin_hdir_unlock(cpg->pin); */ - - err = cpup_iattr(cpg->dentry, cpg->bdst, h_src, &a->h_src_attr); - if (unlikely(err)) { - /* todo: necessary? */ - /* au_pin_hdir_relock(cpg->pin); */ /* ignore an error */ - mutex_unlock(&dst_inode->i_mutex); - goto out_rev; - } - - if (cpg->bdst < old_ibstart) { - if (S_ISREG(inode->i_mode)) { - err = au_dy_iaop(inode, cpg->bdst, dst_inode); - if (unlikely(err)) { - /* ignore an error */ - /* au_pin_hdir_relock(cpg->pin); */ - mutex_unlock(&dst_inode->i_mutex); - goto out_rev; - } - } - au_set_ibstart(inode, cpg->bdst); - } else - au_set_ibend(inode, cpg->bdst); - au_set_h_iptr(inode, cpg->bdst, au_igrab(dst_inode), - au_hi_flags(inode, isdir)); - - /* todo: necessary? */ - /* err = au_pin_hdir_relock(cpg->pin); */ - mutex_unlock(&dst_inode->i_mutex); - if (unlikely(err)) - goto out_rev; - - src_inode = d_inode(h_src); - if (!isdir - && (src_inode->i_nlink > 1 - || src_inode->i_state & I_LINKABLE) - && plink) - au_plink_append(inode, cpg->bdst, h_dst); - - if (au_ftest_cpup(cpg->flags, RENAME)) { - a->h_path.dentry = h_dst; - err = au_do_ren_after_cpup(cpg, &a->h_path); - } - if (!err) - goto out_parent; /* success */ - - /* revert */ -out_rev: - a->h_path.dentry = h_parent; - au_dtime_store(&a->dt, dst_parent, &a->h_path); - a->h_path.dentry = h_dst; - rerr = 0; - if (d_is_positive(h_dst)) { - if (!isdir) { - /* no delegation since it is just created */ - rerr = vfsub_unlink(h_dir, &a->h_path, - /*delegated*/NULL, /*force*/0); - } else - rerr = vfsub_rmdir(h_dir, &a->h_path); - } - au_dtime_revert(&a->dt); - if (rerr) { - AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr); - err = -EIO; - } -out_parent: - dput(dst_parent); - kfree(a); -out: - return err; -} - -#if 0 /* reserved */ -struct au_cpup_single_args { - int *errp; - struct au_cp_generic *cpg; - struct dentry *dst_parent; -}; - -static void au_call_cpup_single(void *args) -{ - struct au_cpup_single_args *a = args; - - au_pin_hdir_acquire_nest(a->cpg->pin); - *a->errp = au_cpup_single(a->cpg, a->dst_parent); - au_pin_hdir_release(a->cpg->pin); -} -#endif - -/* - * prevent SIGXFSZ in copy-up. - * testing CAP_MKNOD is for generic fs, - * but CAP_FSETID is for xfs only, currently. - */ -static int au_cpup_sio_test(struct au_pin *pin, umode_t mode) -{ - int do_sio; - struct super_block *sb; - struct inode *h_dir; - - do_sio = 0; - sb = au_pinned_parent(pin)->d_sb; - if (!au_wkq_test() - && (!au_sbi(sb)->si_plink_maint_pid - || au_plink_maint(sb, AuLock_NOPLM))) { - switch (mode & S_IFMT) { - case S_IFREG: - /* no condition about RLIMIT_FSIZE and the file size */ - do_sio = 1; - break; - case S_IFCHR: - case S_IFBLK: - do_sio = !capable(CAP_MKNOD); - break; - } - if (!do_sio) - do_sio = ((mode & (S_ISUID | S_ISGID)) - && !capable(CAP_FSETID)); - /* this workaround may be removed in the future */ - if (!do_sio) { - h_dir = au_pinned_h_dir(pin); - do_sio = h_dir->i_mode & S_ISVTX; - } - } - - return do_sio; -} - -#if 0 /* reserved */ -int au_sio_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent) -{ - int err, wkq_err; - struct dentry *h_dentry; - - h_dentry = au_h_dptr(cpg->dentry, cpg->bsrc); - if (!au_cpup_sio_test(pin, d_inode(h_dentry)->i_mode)) - err = au_cpup_single(cpg, dst_parent); - else { - struct au_cpup_single_args args = { - .errp = &err, - .cpg = cpg, - .dst_parent = dst_parent - }; - wkq_err = au_wkq_wait(au_call_cpup_single, &args); - if (unlikely(wkq_err)) - err = wkq_err; - } - - return err; -} -#endif - -/* - * copyup the @dentry from the first active lower branch to @bdst, - * using au_cpup_single(). - */ -static int au_cpup_simple(struct au_cp_generic *cpg) -{ - int err; - unsigned int flags_orig; - struct dentry *dentry; - - AuDebugOn(cpg->bsrc < 0); - - dentry = cpg->dentry; - DiMustWriteLock(dentry); - - err = au_lkup_neg(dentry, cpg->bdst, /*wh*/1); - if (!err) { - flags_orig = cpg->flags; - au_fset_cpup(cpg->flags, RENAME); - err = au_cpup_single(cpg, NULL); - cpg->flags = flags_orig; - if (!err) - return 0; /* success */ - - /* revert */ - au_set_h_dptr(dentry, cpg->bdst, NULL); - au_set_dbstart(dentry, cpg->bsrc); - } - - return err; -} - -struct au_cpup_simple_args { - int *errp; - struct au_cp_generic *cpg; -}; - -static void au_call_cpup_simple(void *args) -{ - struct au_cpup_simple_args *a = args; - - au_pin_hdir_acquire_nest(a->cpg->pin); - *a->errp = au_cpup_simple(a->cpg); - au_pin_hdir_release(a->cpg->pin); -} - -static int au_do_sio_cpup_simple(struct au_cp_generic *cpg) -{ - int err, wkq_err; - struct dentry *dentry, *parent; - struct file *h_file; - struct inode *h_dir; - - dentry = cpg->dentry; - h_file = NULL; - if (au_ftest_cpup(cpg->flags, HOPEN)) { - AuDebugOn(cpg->bsrc < 0); - h_file = au_h_open_pre(dentry, cpg->bsrc, /*force_wr*/0); - err = PTR_ERR(h_file); - if (IS_ERR(h_file)) - goto out; - } - - parent = dget_parent(dentry); - h_dir = au_h_iptr(d_inode(parent), cpg->bdst); - if (!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE) - && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode)) - err = au_cpup_simple(cpg); - else { - struct au_cpup_simple_args args = { - .errp = &err, - .cpg = cpg - }; - wkq_err = au_wkq_wait(au_call_cpup_simple, &args); - if (unlikely(wkq_err)) - err = wkq_err; - } - - dput(parent); - if (h_file) - au_h_open_post(dentry, cpg->bsrc, h_file); - -out: - return err; -} - -int au_sio_cpup_simple(struct au_cp_generic *cpg) -{ - aufs_bindex_t bsrc, bend; - struct dentry *dentry, *h_dentry; - - if (cpg->bsrc < 0) { - dentry = cpg->dentry; - bend = au_dbend(dentry); - for (bsrc = cpg->bdst + 1; bsrc <= bend; bsrc++) { - h_dentry = au_h_dptr(dentry, bsrc); - if (h_dentry) { - AuDebugOn(d_is_negative(h_dentry)); - break; - } - } - AuDebugOn(bsrc > bend); - cpg->bsrc = bsrc; - } - AuDebugOn(cpg->bsrc <= cpg->bdst); - return au_do_sio_cpup_simple(cpg); -} - -int au_sio_cpdown_simple(struct au_cp_generic *cpg) -{ - AuDebugOn(cpg->bdst <= cpg->bsrc); - return au_do_sio_cpup_simple(cpg); -} - -/* ---------------------------------------------------------------------- */ - -/* - * copyup the deleted file for writing. - */ -static int au_do_cpup_wh(struct au_cp_generic *cpg, struct dentry *wh_dentry, - struct file *file) -{ - int err; - unsigned int flags_orig; - aufs_bindex_t bsrc_orig; - struct dentry *h_d_dst, *h_d_start; - struct au_dinfo *dinfo; - struct au_hdentry *hdp; - - dinfo = au_di(cpg->dentry); - AuRwMustWriteLock(&dinfo->di_rwsem); - - bsrc_orig = cpg->bsrc; - cpg->bsrc = dinfo->di_bstart; - hdp = dinfo->di_hdentry; - h_d_dst = hdp[0 + cpg->bdst].hd_dentry; - dinfo->di_bstart = cpg->bdst; - hdp[0 + cpg->bdst].hd_dentry = wh_dentry; - h_d_start = NULL; - if (file) { - h_d_start = hdp[0 + cpg->bsrc].hd_dentry; - hdp[0 + cpg->bsrc].hd_dentry = au_hf_top(file)->f_path.dentry; - } - flags_orig = cpg->flags; - cpg->flags = !AuCpup_DTIME; - err = au_cpup_single(cpg, /*h_parent*/NULL); - cpg->flags = flags_orig; - if (file) { - if (!err) - err = au_reopen_nondir(file); - hdp[0 + cpg->bsrc].hd_dentry = h_d_start; - } - hdp[0 + cpg->bdst].hd_dentry = h_d_dst; - dinfo->di_bstart = cpg->bsrc; - cpg->bsrc = bsrc_orig; - - return err; -} - -static int au_cpup_wh(struct au_cp_generic *cpg, struct file *file) -{ - int err; - aufs_bindex_t bdst; - struct au_dtime dt; - struct dentry *dentry, *parent, *h_parent, *wh_dentry; - struct au_branch *br; - struct path h_path; - - dentry = cpg->dentry; - bdst = cpg->bdst; - br = au_sbr(dentry->d_sb, bdst); - parent = dget_parent(dentry); - h_parent = au_h_dptr(parent, bdst); - wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name); - err = PTR_ERR(wh_dentry); - if (IS_ERR(wh_dentry)) - goto out; - - h_path.dentry = h_parent; - h_path.mnt = au_br_mnt(br); - au_dtime_store(&dt, parent, &h_path); - err = au_do_cpup_wh(cpg, wh_dentry, file); - if (unlikely(err)) - goto out_wh; - - dget(wh_dentry); - h_path.dentry = wh_dentry; - if (!d_is_dir(wh_dentry)) { - /* no delegation since it is just created */ - err = vfsub_unlink(d_inode(h_parent), &h_path, - /*delegated*/NULL, /*force*/0); - } else - err = vfsub_rmdir(d_inode(h_parent), &h_path); - if (unlikely(err)) { - AuIOErr("failed remove copied-up tmp file %pd(%d)\n", - wh_dentry, err); - err = -EIO; - } - au_dtime_revert(&dt); - au_set_hi_wh(d_inode(dentry), bdst, wh_dentry); - -out_wh: - dput(wh_dentry); -out: - dput(parent); - return err; -} - -struct au_cpup_wh_args { - int *errp; - struct au_cp_generic *cpg; - struct file *file; -}; - -static void au_call_cpup_wh(void *args) -{ - struct au_cpup_wh_args *a = args; - - au_pin_hdir_acquire_nest(a->cpg->pin); - *a->errp = au_cpup_wh(a->cpg, a->file); - au_pin_hdir_release(a->cpg->pin); -} - -int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file) -{ - int err, wkq_err; - aufs_bindex_t bdst; - struct dentry *dentry, *parent, *h_orph, *h_parent; - struct inode *dir, *h_dir, *h_tmpdir; - struct au_wbr *wbr; - struct au_pin wh_pin, *pin_orig; - - dentry = cpg->dentry; - bdst = cpg->bdst; - parent = dget_parent(dentry); - dir = d_inode(parent); - h_orph = NULL; - h_parent = NULL; - h_dir = au_igrab(au_h_iptr(dir, bdst)); - h_tmpdir = h_dir; - pin_orig = NULL; - if (!h_dir->i_nlink) { - wbr = au_sbr(dentry->d_sb, bdst)->br_wbr; - h_orph = wbr->wbr_orph; - - h_parent = dget(au_h_dptr(parent, bdst)); - au_set_h_dptr(parent, bdst, dget(h_orph)); - h_tmpdir = d_inode(h_orph); - au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0); - - mutex_lock_nested(&h_tmpdir->i_mutex, AuLsc_I_PARENT3); - /* todo: au_h_open_pre()? */ - - pin_orig = cpg->pin; - au_pin_init(&wh_pin, dentry, bdst, AuLsc_DI_PARENT, - AuLsc_I_PARENT3, cpg->pin->udba, AuPin_DI_LOCKED); - cpg->pin = &wh_pin; - } - - if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE) - && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode)) - err = au_cpup_wh(cpg, file); - else { - struct au_cpup_wh_args args = { - .errp = &err, - .cpg = cpg, - .file = file - }; - wkq_err = au_wkq_wait(au_call_cpup_wh, &args); - if (unlikely(wkq_err)) - err = wkq_err; - } - - if (h_orph) { - mutex_unlock(&h_tmpdir->i_mutex); - /* todo: au_h_open_post()? */ - au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0); - au_set_h_dptr(parent, bdst, h_parent); - AuDebugOn(!pin_orig); - cpg->pin = pin_orig; - } - iput(h_dir); - dput(parent); - - return err; -} - -/* ---------------------------------------------------------------------- */ - -/* - * generic routine for both of copy-up and copy-down. - */ -/* cf. revalidate function in file.c */ -int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, - int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, - struct au_pin *pin, - struct dentry *h_parent, void *arg), - void *arg) -{ - int err; - struct au_pin pin; - struct dentry *d, *parent, *h_parent, *real_parent, *h_dentry; - - err = 0; - parent = dget_parent(dentry); - if (IS_ROOT(parent)) - goto out; - - au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2, - au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE); - - /* do not use au_dpage */ - real_parent = parent; - while (1) { - dput(parent); - parent = dget_parent(dentry); - h_parent = au_h_dptr(parent, bdst); - if (h_parent) - goto out; /* success */ - - /* find top dir which is necessary to cpup */ - do { - d = parent; - dput(parent); - parent = dget_parent(d); - di_read_lock_parent3(parent, !AuLock_IR); - h_parent = au_h_dptr(parent, bdst); - di_read_unlock(parent, !AuLock_IR); - } while (!h_parent); - - if (d != real_parent) - di_write_lock_child3(d); - - /* somebody else might create while we were sleeping */ - h_dentry = au_h_dptr(d, bdst); - if (!h_dentry || d_is_negative(h_dentry)) { - if (h_dentry) - au_update_dbstart(d); - - au_pin_set_dentry(&pin, d); - err = au_do_pin(&pin); - if (!err) { - err = cp(d, bdst, &pin, h_parent, arg); - au_unpin(&pin); - } - } - - if (d != real_parent) - di_write_unlock(d); - if (unlikely(err)) - break; - } - -out: - dput(parent); - return err; -} - -static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst, - struct au_pin *pin, - struct dentry *h_parent __maybe_unused, - void *arg __maybe_unused) -{ - struct au_cp_generic cpg = { - .dentry = dentry, - .bdst = bdst, - .bsrc = -1, - .len = 0, - .pin = pin, - .flags = AuCpup_DTIME - }; - return au_sio_cpup_simple(&cpg); -} - -int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) -{ - return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL); -} - -int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) -{ - int err; - struct dentry *parent; - struct inode *dir; - - parent = dget_parent(dentry); - dir = d_inode(parent); - err = 0; - if (au_h_iptr(dir, bdst)) - goto out; - - di_read_unlock(parent, AuLock_IR); - di_write_lock_parent(parent); - /* someone else might change our inode while we were sleeping */ - if (!au_h_iptr(dir, bdst)) - err = au_cpup_dirs(dentry, bdst); - di_downgrade_lock(parent, AuLock_IR); - -out: - dput(parent); - return err; -} |