diff options
Diffstat (limited to 'fs/aufs/i_op_add.c')
| -rw-r--r-- | fs/aufs/i_op_add.c | 919 |
1 files changed, 0 insertions, 919 deletions
diff --git a/fs/aufs/i_op_add.c b/fs/aufs/i_op_add.c deleted file mode 100644 index 3fc355859..000000000 --- a/fs/aufs/i_op_add.c +++ /dev/null @@ -1,919 +0,0 @@ -/* - * Copyright (C) 2005-2016 Junjiro R. Okajima - */ - -/* - * inode operations (add entry) - */ - -#include "aufs.h" - -/* - * final procedure of adding a new entry, except link(2). - * remove whiteout, instantiate, copyup the parent dir's times and size - * and update version. - * if it failed, re-create the removed whiteout. - */ -static int epilog(struct inode *dir, aufs_bindex_t bindex, - struct dentry *wh_dentry, struct dentry *dentry) -{ - int err, rerr; - aufs_bindex_t bwh; - struct path h_path; - struct super_block *sb; - struct inode *inode, *h_dir; - struct dentry *wh; - - bwh = -1; - sb = dir->i_sb; - if (wh_dentry) { - h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */ - IMustLock(h_dir); - AuDebugOn(au_h_iptr(dir, bindex) != h_dir); - bwh = au_dbwh(dentry); - h_path.dentry = wh_dentry; - h_path.mnt = au_sbr_mnt(sb, bindex); - err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, - dentry); - if (unlikely(err)) - goto out; - } - - inode = au_new_inode(dentry, /*must_new*/1); - if (!IS_ERR(inode)) { - d_instantiate(dentry, inode); - dir = d_inode(dentry->d_parent); /* dir inode is locked */ - IMustLock(dir); - au_dir_ts(dir, bindex); - dir->i_version++; - au_fhsm_wrote(sb, bindex, /*force*/0); - return 0; /* success */ - } - - err = PTR_ERR(inode); - if (!wh_dentry) - goto out; - - /* revert */ - /* dir inode is locked */ - wh = au_wh_create(dentry, bwh, wh_dentry->d_parent); - rerr = PTR_ERR(wh); - if (IS_ERR(wh)) { - AuIOErr("%pd reverting whiteout failed(%d, %d)\n", - dentry, err, rerr); - err = -EIO; - } else - dput(wh); - -out: - return err; -} - -static int au_d_may_add(struct dentry *dentry) -{ - int err; - - err = 0; - if (unlikely(d_unhashed(dentry))) - err = -ENOENT; - if (unlikely(d_really_is_positive(dentry))) - err = -EEXIST; - return err; -} - -/* - * simple tests for the adding inode operations. - * following the checks in vfs, plus the parent-child relationship. - */ -int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, - struct dentry *h_parent, int isdir) -{ - int err; - umode_t h_mode; - struct dentry *h_dentry; - struct inode *h_inode; - - err = -ENAMETOOLONG; - if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) - goto out; - - h_dentry = au_h_dptr(dentry, bindex); - if (d_really_is_negative(dentry)) { - err = -EEXIST; - if (unlikely(d_is_positive(h_dentry))) - goto out; - } else { - /* rename(2) case */ - err = -EIO; - if (unlikely(d_is_negative(h_dentry))) - goto out; - h_inode = d_inode(h_dentry); - if (unlikely(!h_inode->i_nlink)) - goto out; - - h_mode = h_inode->i_mode; - if (!isdir) { - err = -EISDIR; - if (unlikely(S_ISDIR(h_mode))) - goto out; - } else if (unlikely(!S_ISDIR(h_mode))) { - err = -ENOTDIR; - goto out; - } - } - - err = 0; - /* expected parent dir is locked */ - if (unlikely(h_parent != h_dentry->d_parent)) - err = -EIO; - -out: - AuTraceErr(err); - return err; -} - -/* - * initial procedure of adding a new entry. - * prepare writable branch and the parent dir, lock it, - * and lookup whiteout for the new entry. - */ -static struct dentry* -lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt, - struct dentry *src_dentry, struct au_pin *pin, - struct au_wr_dir_args *wr_dir_args) -{ - struct dentry *wh_dentry, *h_parent; - struct super_block *sb; - struct au_branch *br; - int err; - unsigned int udba; - aufs_bindex_t bcpup; - - AuDbg("%pd\n", dentry); - - err = au_wr_dir(dentry, src_dentry, wr_dir_args); - bcpup = err; - wh_dentry = ERR_PTR(err); - if (unlikely(err < 0)) - goto out; - - sb = dentry->d_sb; - udba = au_opt_udba(sb); - err = au_pin(pin, dentry, bcpup, udba, - AuPin_DI_LOCKED | AuPin_MNT_WRITE); - wh_dentry = ERR_PTR(err); - if (unlikely(err)) - goto out; - - h_parent = au_pinned_h_parent(pin); - if (udba != AuOpt_UDBA_NONE - && au_dbstart(dentry) == bcpup) - err = au_may_add(dentry, bcpup, h_parent, - au_ftest_wrdir(wr_dir_args->flags, ISDIR)); - else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) - err = -ENAMETOOLONG; - wh_dentry = ERR_PTR(err); - if (unlikely(err)) - goto out_unpin; - - br = au_sbr(sb, bcpup); - if (dt) { - struct path tmp = { - .dentry = h_parent, - .mnt = au_br_mnt(br) - }; - au_dtime_store(dt, au_pinned_parent(pin), &tmp); - } - - wh_dentry = NULL; - if (bcpup != au_dbwh(dentry)) - goto out; /* success */ - - /* - * ENAMETOOLONG here means that if we allowed create such name, then it - * would not be able to removed in the future. So we don't allow such - * name here and we don't handle ENAMETOOLONG differently here. - */ - wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br); - -out_unpin: - if (IS_ERR(wh_dentry)) - au_unpin(pin); -out: - return wh_dentry; -} - -/* ---------------------------------------------------------------------- */ - -enum { Mknod, Symlink, Creat }; -struct simple_arg { - int type; - union { - struct { - umode_t mode; - bool want_excl; - bool try_aopen; - struct vfsub_aopen_args *aopen; - } c; - struct { - const char *symname; - } s; - struct { - umode_t mode; - dev_t dev; - } m; - } u; -}; - -static int add_simple(struct inode *dir, struct dentry *dentry, - struct simple_arg *arg) -{ - int err, rerr; - aufs_bindex_t bstart; - unsigned char created; - const unsigned char try_aopen - = (arg->type == Creat && arg->u.c.try_aopen); - struct dentry *wh_dentry, *parent; - struct inode *h_dir; - struct super_block *sb; - struct au_branch *br; - /* to reuduce stack size */ - struct { - struct au_dtime dt; - struct au_pin pin; - struct path h_path; - struct au_wr_dir_args wr_dir_args; - } *a; - - AuDbg("%pd\n", dentry); - IMustLock(dir); - - err = -ENOMEM; - a = kmalloc(sizeof(*a), GFP_NOFS); - if (unlikely(!a)) - goto out; - a->wr_dir_args.force_btgt = -1; - a->wr_dir_args.flags = AuWrDir_ADD_ENTRY; - - parent = dentry->d_parent; /* dir inode is locked */ - if (!try_aopen) { - err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); - if (unlikely(err)) - goto out_free; - } - err = au_d_may_add(dentry); - if (unlikely(err)) - goto out_unlock; - if (!try_aopen) - di_write_lock_parent(parent); - wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, - &a->pin, &a->wr_dir_args); - err = PTR_ERR(wh_dentry); - if (IS_ERR(wh_dentry)) - goto out_parent; - - bstart = au_dbstart(dentry); - sb = dentry->d_sb; - br = au_sbr(sb, bstart); - a->h_path.dentry = au_h_dptr(dentry, bstart); - a->h_path.mnt = au_br_mnt(br); - h_dir = au_pinned_h_dir(&a->pin); - switch (arg->type) { - case Creat: - err = 0; - if (!try_aopen || !h_dir->i_op->atomic_open) - err = vfsub_create(h_dir, &a->h_path, arg->u.c.mode, - arg->u.c.want_excl); - else - err = vfsub_atomic_open(h_dir, a->h_path.dentry, - arg->u.c.aopen, br); - break; - case Symlink: - err = vfsub_symlink(h_dir, &a->h_path, arg->u.s.symname); - break; - case Mknod: - err = vfsub_mknod(h_dir, &a->h_path, arg->u.m.mode, - arg->u.m.dev); - break; - default: - BUG(); - } - created = !err; - if (!err) - err = epilog(dir, bstart, wh_dentry, dentry); - - /* revert */ - if (unlikely(created && err && d_is_positive(a->h_path.dentry))) { - /* no delegation since it is just created */ - rerr = vfsub_unlink(h_dir, &a->h_path, /*delegated*/NULL, - /*force*/0); - if (rerr) { - AuIOErr("%pd revert failure(%d, %d)\n", - dentry, err, rerr); - err = -EIO; - } - au_dtime_revert(&a->dt); - } - - if (!err && try_aopen && !h_dir->i_op->atomic_open) - *arg->u.c.aopen->opened |= FILE_CREATED; - - au_unpin(&a->pin); - dput(wh_dentry); - -out_parent: - if (!try_aopen) - di_write_unlock(parent); -out_unlock: - if (unlikely(err)) { - au_update_dbstart(dentry); - d_drop(dentry); - } - if (!try_aopen) - aufs_read_unlock(dentry, AuLock_DW); -out_free: - kfree(a); -out: - return err; -} - -int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, - dev_t dev) -{ - struct simple_arg arg = { - .type = Mknod, - .u.m = { - .mode = mode, - .dev = dev - } - }; - return add_simple(dir, dentry, &arg); -} - -int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) -{ - struct simple_arg arg = { - .type = Symlink, - .u.s.symname = symname - }; - return add_simple(dir, dentry, &arg); -} - -int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode, - bool want_excl) -{ - struct simple_arg arg = { - .type = Creat, - .u.c = { - .mode = mode, - .want_excl = want_excl - } - }; - return add_simple(dir, dentry, &arg); -} - -int au_aopen_or_create(struct inode *dir, struct dentry *dentry, - struct vfsub_aopen_args *aopen_args) -{ - struct simple_arg arg = { - .type = Creat, - .u.c = { - .mode = aopen_args->create_mode, - .want_excl = aopen_args->open_flag & O_EXCL, - .try_aopen = true, - .aopen = aopen_args - } - }; - return add_simple(dir, dentry, &arg); -} - -int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) -{ - int err; - aufs_bindex_t bindex; - struct super_block *sb; - struct dentry *parent, *h_parent, *h_dentry; - struct inode *h_dir, *inode; - struct vfsmount *h_mnt; - struct au_wr_dir_args wr_dir_args = { - .force_btgt = -1, - .flags = AuWrDir_TMPFILE - }; - - /* copy-up may happen */ - mutex_lock(&dir->i_mutex); - - sb = dir->i_sb; - err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); - if (unlikely(err)) - goto out; - - err = au_di_init(dentry); - if (unlikely(err)) - goto out_si; - - err = -EBUSY; - parent = d_find_any_alias(dir); - AuDebugOn(!parent); - di_write_lock_parent(parent); - if (unlikely(d_inode(parent) != dir)) - goto out_parent; - - err = au_digen_test(parent, au_sigen(sb)); - if (unlikely(err)) - goto out_parent; - - bindex = au_dbstart(parent); - au_set_dbstart(dentry, bindex); - au_set_dbend(dentry, bindex); - err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); - bindex = err; - if (unlikely(err < 0)) - goto out_parent; - - err = -EOPNOTSUPP; - h_dir = au_h_iptr(dir, bindex); - if (unlikely(!h_dir->i_op->tmpfile)) - goto out_parent; - - h_mnt = au_sbr_mnt(sb, bindex); - err = vfsub_mnt_want_write(h_mnt); - if (unlikely(err)) - goto out_parent; - - h_parent = au_h_dptr(parent, bindex); - err = inode_permission(d_inode(h_parent), MAY_WRITE | MAY_EXEC); - if (unlikely(err)) - goto out_mnt; - - err = -ENOMEM; - h_dentry = d_alloc(h_parent, &dentry->d_name); - if (unlikely(!h_dentry)) - goto out_mnt; - - err = h_dir->i_op->tmpfile(h_dir, h_dentry, mode); - if (unlikely(err)) - goto out_dentry; - - au_set_dbstart(dentry, bindex); - au_set_dbend(dentry, bindex); - au_set_h_dptr(dentry, bindex, dget(h_dentry)); - inode = au_new_inode(dentry, /*must_new*/1); - if (IS_ERR(inode)) { - err = PTR_ERR(inode); - au_set_h_dptr(dentry, bindex, NULL); - au_set_dbstart(dentry, -1); - au_set_dbend(dentry, -1); - } else { - if (!inode->i_nlink) - set_nlink(inode, 1); - d_tmpfile(dentry, inode); - au_di(dentry)->di_tmpfile = 1; - - /* update without i_mutex */ - if (au_ibstart(dir) == au_dbstart(dentry)) - au_cpup_attr_timesizes(dir); - } - -out_dentry: - dput(h_dentry); -out_mnt: - vfsub_mnt_drop_write(h_mnt); -out_parent: - di_write_unlock(parent); - dput(parent); - di_write_unlock(dentry); - if (!err) -#if 0 - /* verbose coding for lock class name */ - au_rw_class(&au_di(dentry)->di_rwsem, - au_lc_key + AuLcNonDir_DIINFO); -#else - ; -#endif - else { - au_di_fin(dentry); - dentry->d_fsdata = NULL; - } -out_si: - si_read_unlock(sb); -out: - mutex_unlock(&dir->i_mutex); - return err; -} - -/* ---------------------------------------------------------------------- */ - -struct au_link_args { - aufs_bindex_t bdst, bsrc; - struct au_pin pin; - struct path h_path; - struct dentry *src_parent, *parent; -}; - -static int au_cpup_before_link(struct dentry *src_dentry, - struct au_link_args *a) -{ - int err; - struct dentry *h_src_dentry; - struct au_cp_generic cpg = { - .dentry = src_dentry, - .bdst = a->bdst, - .bsrc = a->bsrc, - .len = -1, - .pin = &a->pin, - .flags = AuCpup_DTIME | AuCpup_HOPEN /* | AuCpup_KEEPLINO */ - }; - - di_read_lock_parent(a->src_parent, AuLock_IR); - err = au_test_and_cpup_dirs(src_dentry, a->bdst); - if (unlikely(err)) - goto out; - - h_src_dentry = au_h_dptr(src_dentry, a->bsrc); - err = au_pin(&a->pin, src_dentry, a->bdst, - au_opt_udba(src_dentry->d_sb), - AuPin_DI_LOCKED | AuPin_MNT_WRITE); - if (unlikely(err)) - goto out; - - err = au_sio_cpup_simple(&cpg); - au_unpin(&a->pin); - -out: - di_read_unlock(a->src_parent, AuLock_IR); - return err; -} - -static int au_cpup_or_link(struct dentry *src_dentry, struct dentry *dentry, - struct au_link_args *a) -{ - int err; - unsigned char plink; - aufs_bindex_t bend; - struct dentry *h_src_dentry; - struct inode *h_inode, *inode, *delegated; - struct super_block *sb; - struct file *h_file; - - plink = 0; - h_inode = NULL; - sb = src_dentry->d_sb; - inode = d_inode(src_dentry); - if (au_ibstart(inode) <= a->bdst) - h_inode = au_h_iptr(inode, a->bdst); - if (!h_inode || !h_inode->i_nlink) { - /* copyup src_dentry as the name of dentry. */ - bend = au_dbend(dentry); - if (bend < a->bsrc) - au_set_dbend(dentry, a->bsrc); - au_set_h_dptr(dentry, a->bsrc, - dget(au_h_dptr(src_dentry, a->bsrc))); - dget(a->h_path.dentry); - au_set_h_dptr(dentry, a->bdst, NULL); - AuDbg("temporary d_inode...\n"); - spin_lock(&dentry->d_lock); - dentry->d_inode = d_inode(src_dentry); /* tmp */ - spin_unlock(&dentry->d_lock); - h_file = au_h_open_pre(dentry, a->bsrc, /*force_wr*/0); - if (IS_ERR(h_file)) - err = PTR_ERR(h_file); - else { - struct au_cp_generic cpg = { - .dentry = dentry, - .bdst = a->bdst, - .bsrc = -1, - .len = -1, - .pin = &a->pin, - .flags = AuCpup_KEEPLINO - }; - err = au_sio_cpup_simple(&cpg); - au_h_open_post(dentry, a->bsrc, h_file); - if (!err) { - dput(a->h_path.dentry); - a->h_path.dentry = au_h_dptr(dentry, a->bdst); - } else - au_set_h_dptr(dentry, a->bdst, - a->h_path.dentry); - } - spin_lock(&dentry->d_lock); - dentry->d_inode = NULL; /* restore */ - spin_unlock(&dentry->d_lock); - AuDbg("temporary d_inode...done\n"); - au_set_h_dptr(dentry, a->bsrc, NULL); - au_set_dbend(dentry, bend); - } else { - /* the inode of src_dentry already exists on a.bdst branch */ - h_src_dentry = d_find_alias(h_inode); - if (!h_src_dentry && au_plink_test(inode)) { - plink = 1; - h_src_dentry = au_plink_lkup(inode, a->bdst); - err = PTR_ERR(h_src_dentry); - if (IS_ERR(h_src_dentry)) - goto out; - - if (unlikely(d_is_negative(h_src_dentry))) { - dput(h_src_dentry); - h_src_dentry = NULL; - } - - } - if (h_src_dentry) { - delegated = NULL; - err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), - &a->h_path, &delegated); - if (unlikely(err == -EWOULDBLOCK)) { - pr_warn("cannot retry for NFSv4 delegation" - " for an internal link\n"); - iput(delegated); - } - dput(h_src_dentry); - } else { - AuIOErr("no dentry found for hi%lu on b%d\n", - h_inode->i_ino, a->bdst); - err = -EIO; - } - } - - if (!err && !plink) - au_plink_append(inode, a->bdst, a->h_path.dentry); - -out: - AuTraceErr(err); - return err; -} - -int aufs_link(struct dentry *src_dentry, struct inode *dir, - struct dentry *dentry) -{ - int err, rerr; - struct au_dtime dt; - struct au_link_args *a; - struct dentry *wh_dentry, *h_src_dentry; - struct inode *inode, *delegated; - struct super_block *sb; - struct au_wr_dir_args wr_dir_args = { - /* .force_btgt = -1, */ - .flags = AuWrDir_ADD_ENTRY - }; - - IMustLock(dir); - inode = d_inode(src_dentry); - IMustLock(inode); - - err = -ENOMEM; - a = kzalloc(sizeof(*a), GFP_NOFS); - if (unlikely(!a)) - goto out; - - a->parent = dentry->d_parent; /* dir inode is locked */ - err = aufs_read_and_write_lock2(dentry, src_dentry, - AuLock_NOPLM | AuLock_GEN); - if (unlikely(err)) - goto out_kfree; - err = au_d_linkable(src_dentry); - if (unlikely(err)) - goto out_unlock; - err = au_d_may_add(dentry); - if (unlikely(err)) - goto out_unlock; - - a->src_parent = dget_parent(src_dentry); - wr_dir_args.force_btgt = au_ibstart(inode); - - di_write_lock_parent(a->parent); - wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt); - wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin, - &wr_dir_args); - err = PTR_ERR(wh_dentry); - if (IS_ERR(wh_dentry)) - goto out_parent; - - err = 0; - sb = dentry->d_sb; - a->bdst = au_dbstart(dentry); - a->h_path.dentry = au_h_dptr(dentry, a->bdst); - a->h_path.mnt = au_sbr_mnt(sb, a->bdst); - a->bsrc = au_ibstart(inode); - h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); - if (!h_src_dentry && au_di(src_dentry)->di_tmpfile) - h_src_dentry = dget(au_hi_wh(inode, a->bsrc)); - if (!h_src_dentry) { - a->bsrc = au_dbstart(src_dentry); - h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); - AuDebugOn(!h_src_dentry); - } else if (IS_ERR(h_src_dentry)) { - err = PTR_ERR(h_src_dentry); - goto out_parent; - } - - if (au_opt_test(au_mntflags(sb), PLINK)) { - if (a->bdst < a->bsrc - /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) - err = au_cpup_or_link(src_dentry, dentry, a); - else { - delegated = NULL; - err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), - &a->h_path, &delegated); - if (unlikely(err == -EWOULDBLOCK)) { - pr_warn("cannot retry for NFSv4 delegation" - " for an internal link\n"); - iput(delegated); - } - } - dput(h_src_dentry); - } else { - /* - * copyup src_dentry to the branch we process, - * and then link(2) to it. - */ - dput(h_src_dentry); - if (a->bdst < a->bsrc - /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) { - au_unpin(&a->pin); - di_write_unlock(a->parent); - err = au_cpup_before_link(src_dentry, a); - di_write_lock_parent(a->parent); - if (!err) - err = au_pin(&a->pin, dentry, a->bdst, - au_opt_udba(sb), - AuPin_DI_LOCKED | AuPin_MNT_WRITE); - if (unlikely(err)) - goto out_wh; - } - if (!err) { - h_src_dentry = au_h_dptr(src_dentry, a->bdst); - err = -ENOENT; - if (h_src_dentry && d_is_positive(h_src_dentry)) { - delegated = NULL; - err = vfsub_link(h_src_dentry, - au_pinned_h_dir(&a->pin), - &a->h_path, &delegated); - if (unlikely(err == -EWOULDBLOCK)) { - pr_warn("cannot retry" - " for NFSv4 delegation" - " for an internal link\n"); - iput(delegated); - } - } - } - } - if (unlikely(err)) - goto out_unpin; - - if (wh_dentry) { - a->h_path.dentry = wh_dentry; - err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path, - dentry); - if (unlikely(err)) - goto out_revert; - } - - au_dir_ts(dir, a->bdst); - dir->i_version++; - inc_nlink(inode); - inode->i_ctime = dir->i_ctime; - d_instantiate(dentry, au_igrab(inode)); - if (d_unhashed(a->h_path.dentry)) - /* some filesystem calls d_drop() */ - d_drop(dentry); - /* some filesystems consume an inode even hardlink */ - au_fhsm_wrote(sb, a->bdst, /*force*/0); - goto out_unpin; /* success */ - -out_revert: - /* no delegation since it is just created */ - rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, - /*delegated*/NULL, /*force*/0); - if (unlikely(rerr)) { - AuIOErr("%pd reverting failed(%d, %d)\n", dentry, err, rerr); - err = -EIO; - } - au_dtime_revert(&dt); -out_unpin: - au_unpin(&a->pin); -out_wh: - dput(wh_dentry); -out_parent: - di_write_unlock(a->parent); - dput(a->src_parent); -out_unlock: - if (unlikely(err)) { - au_update_dbstart(dentry); - d_drop(dentry); - } - aufs_read_and_write_unlock2(dentry, src_dentry); -out_kfree: - kfree(a); -out: - AuTraceErr(err); - return err; -} - -int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) -{ - int err, rerr; - aufs_bindex_t bindex; - unsigned char diropq; - struct path h_path; - struct dentry *wh_dentry, *parent, *opq_dentry; - struct mutex *h_mtx; - struct super_block *sb; - struct { - struct au_pin pin; - struct au_dtime dt; - } *a; /* reduce the stack usage */ - struct au_wr_dir_args wr_dir_args = { - .force_btgt = -1, - .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR - }; - - IMustLock(dir); - - err = -ENOMEM; - a = kmalloc(sizeof(*a), GFP_NOFS); - if (unlikely(!a)) - goto out; - - err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); - if (unlikely(err)) - goto out_free; - err = au_d_may_add(dentry); - if (unlikely(err)) - goto out_unlock; - - parent = dentry->d_parent; /* dir inode is locked */ - di_write_lock_parent(parent); - wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, - &a->pin, &wr_dir_args); - err = PTR_ERR(wh_dentry); - if (IS_ERR(wh_dentry)) - goto out_parent; - - sb = dentry->d_sb; - bindex = au_dbstart(dentry); - h_path.dentry = au_h_dptr(dentry, bindex); - h_path.mnt = au_sbr_mnt(sb, bindex); - err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode); - if (unlikely(err)) - goto out_unpin; - - /* make the dir opaque */ - diropq = 0; - h_mtx = &d_inode(h_path.dentry)->i_mutex; - if (wh_dentry - || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) { - mutex_lock_nested(h_mtx, AuLsc_I_CHILD); - opq_dentry = au_diropq_create(dentry, bindex); - mutex_unlock(h_mtx); - err = PTR_ERR(opq_dentry); - if (IS_ERR(opq_dentry)) - goto out_dir; - dput(opq_dentry); - diropq = 1; - } - - err = epilog(dir, bindex, wh_dentry, dentry); - if (!err) { - inc_nlink(dir); - goto out_unpin; /* success */ - } - - /* revert */ - if (diropq) { - AuLabel(revert opq); - mutex_lock_nested(h_mtx, AuLsc_I_CHILD); - rerr = au_diropq_remove(dentry, bindex); - mutex_unlock(h_mtx); - if (rerr) { - AuIOErr("%pd reverting diropq failed(%d, %d)\n", - dentry, err, rerr); - err = -EIO; - } - } - -out_dir: - AuLabel(revert dir); - rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path); - if (rerr) { - AuIOErr("%pd reverting dir failed(%d, %d)\n", - dentry, err, rerr); - err = -EIO; - } - au_dtime_revert(&a->dt); -out_unpin: - au_unpin(&a->pin); - dput(wh_dentry); -out_parent: - di_write_unlock(parent); -out_unlock: - if (unlikely(err)) { - au_update_dbstart(dentry); - d_drop(dentry); - } - aufs_read_unlock(dentry, AuLock_DW); -out_free: - kfree(a); -out: - return err; -} |