| /* dir.c: AFS filesystem directory handling |
| * |
| * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * 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; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/fs.h> |
| #include <linux/namei.h> |
| #include <linux/pagemap.h> |
| #include <linux/ctype.h> |
| #include <linux/sched.h> |
| #include "internal.h" |
| |
| static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
| unsigned int flags); |
| static int afs_dir_open(struct inode *inode, struct file *file); |
| static int afs_readdir(struct file *file, struct dir_context *ctx); |
| static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); |
| static int afs_d_delete(const struct dentry *dentry); |
| static void afs_d_release(struct dentry *dentry); |
| static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
| loff_t fpos, u64 ino, unsigned dtype); |
| static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| bool excl); |
| static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
| static int afs_rmdir(struct inode *dir, struct dentry *dentry); |
| static int afs_unlink(struct inode *dir, struct dentry *dentry); |
| static int afs_link(struct dentry *from, struct inode *dir, |
| struct dentry *dentry); |
| static int afs_symlink(struct inode *dir, struct dentry *dentry, |
| const char *content); |
| static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry, |
| unsigned int flags); |
| |
| const struct file_operations afs_dir_file_operations = { |
| .open = afs_dir_open, |
| .release = afs_release, |
| .iterate_shared = afs_readdir, |
| .lock = afs_lock, |
| .llseek = generic_file_llseek, |
| }; |
| |
| const struct inode_operations afs_dir_inode_operations = { |
| .create = afs_create, |
| .lookup = afs_lookup, |
| .link = afs_link, |
| .unlink = afs_unlink, |
| .symlink = afs_symlink, |
| .mkdir = afs_mkdir, |
| .rmdir = afs_rmdir, |
| .rename = afs_rename, |
| .permission = afs_permission, |
| .getattr = afs_getattr, |
| .setattr = afs_setattr, |
| }; |
| |
| const struct dentry_operations afs_fs_dentry_operations = { |
| .d_revalidate = afs_d_revalidate, |
| .d_delete = afs_d_delete, |
| .d_release = afs_d_release, |
| .d_automount = afs_d_automount, |
| }; |
| |
| #define AFS_DIR_HASHTBL_SIZE 128 |
| #define AFS_DIR_DIRENT_SIZE 32 |
| #define AFS_DIRENT_PER_BLOCK 64 |
| |
| union afs_dirent { |
| struct { |
| uint8_t valid; |
| uint8_t unused[1]; |
| __be16 hash_next; |
| __be32 vnode; |
| __be32 unique; |
| uint8_t name[16]; |
| uint8_t overflow[4]; /* if any char of the name (inc |
| * NUL) reaches here, consume |
| * the next dirent too */ |
| } u; |
| uint8_t extended_name[32]; |
| }; |
| |
| /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ |
| struct afs_dir_pagehdr { |
| __be16 npages; |
| __be16 magic; |
| #define AFS_DIR_MAGIC htons(1234) |
| uint8_t nentries; |
| uint8_t bitmap[8]; |
| uint8_t pad[19]; |
| }; |
| |
| /* directory block layout */ |
| union afs_dir_block { |
| |
| struct afs_dir_pagehdr pagehdr; |
| |
| struct { |
| struct afs_dir_pagehdr pagehdr; |
| uint8_t alloc_ctrs[128]; |
| /* dir hash table */ |
| uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; |
| } hdr; |
| |
| union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; |
| }; |
| |
| /* layout on a linux VM page */ |
| struct afs_dir_page { |
| union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; |
| }; |
| |
| struct afs_lookup_cookie { |
| struct dir_context ctx; |
| struct afs_fid fid; |
| struct qstr name; |
| int found; |
| }; |
| |
| /* |
| * check that a directory page is valid |
| */ |
| static inline bool afs_dir_check_page(struct inode *dir, struct page *page) |
| { |
| struct afs_dir_page *dbuf; |
| loff_t latter; |
| int tmp, qty; |
| |
| #if 0 |
| /* check the page count */ |
| qty = desc.size / sizeof(dbuf->blocks[0]); |
| if (qty == 0) |
| goto error; |
| |
| if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { |
| printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", |
| __func__, dir->i_ino, qty, |
| ntohs(dbuf->blocks[0].pagehdr.npages)); |
| goto error; |
| } |
| #endif |
| |
| /* determine how many magic numbers there should be in this page */ |
| latter = dir->i_size - page_offset(page); |
| if (latter >= PAGE_SIZE) |
| qty = PAGE_SIZE; |
| else |
| qty = latter; |
| qty /= sizeof(union afs_dir_block); |
| |
| /* check them */ |
| dbuf = page_address(page); |
| for (tmp = 0; tmp < qty; tmp++) { |
| if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { |
| printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", |
| __func__, dir->i_ino, tmp, qty, |
| ntohs(dbuf->blocks[tmp].pagehdr.magic)); |
| goto error; |
| } |
| } |
| |
| SetPageChecked(page); |
| return true; |
| |
| error: |
| SetPageError(page); |
| return false; |
| } |
| |
| /* |
| * discard a page cached in the pagecache |
| */ |
| static inline void afs_dir_put_page(struct page *page) |
| { |
| kunmap(page); |
| put_page(page); |
| } |
| |
| /* |
| * get a page into the pagecache |
| */ |
| static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, |
| struct key *key) |
| { |
| struct page *page; |
| _enter("{%lu},%lu", dir->i_ino, index); |
| |
| page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); |
| if (!IS_ERR(page)) { |
| kmap(page); |
| if (unlikely(!PageChecked(page))) { |
| if (PageError(page) || !afs_dir_check_page(dir, page)) |
| goto fail; |
| } |
| } |
| return page; |
| |
| fail: |
| afs_dir_put_page(page); |
| _leave(" = -EIO"); |
| return ERR_PTR(-EIO); |
| } |
| |
| /* |
| * open an AFS directory file |
| */ |
| static int afs_dir_open(struct inode *inode, struct file *file) |
| { |
| _enter("{%lu}", inode->i_ino); |
| |
| BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
| BUILD_BUG_ON(sizeof(union afs_dirent) != 32); |
| |
| if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
| return -ENOENT; |
| |
| return afs_open(inode, file); |
| } |
| |
| /* |
| * deal with one block in an AFS directory |
| */ |
| static int afs_dir_iterate_block(struct dir_context *ctx, |
| union afs_dir_block *block, |
| unsigned blkoff) |
| { |
| union afs_dirent *dire; |
| unsigned offset, next, curr; |
| size_t nlen; |
| int tmp; |
| |
| _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
| |
| curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); |
| |
| /* walk through the block, an entry at a time */ |
| for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; |
| offset < AFS_DIRENT_PER_BLOCK; |
| offset = next |
| ) { |
| next = offset + 1; |
| |
| /* skip entries marked unused in the bitmap */ |
| if (!(block->pagehdr.bitmap[offset / 8] & |
| (1 << (offset % 8)))) { |
| _debug("ENT[%Zu.%u]: unused", |
| blkoff / sizeof(union afs_dir_block), offset); |
| if (offset >= curr) |
| ctx->pos = blkoff + |
| next * sizeof(union afs_dirent); |
| continue; |
| } |
| |
| /* got a valid entry */ |
| dire = &block->dirents[offset]; |
| nlen = strnlen(dire->u.name, |
| sizeof(*block) - |
| offset * sizeof(union afs_dirent)); |
| |
| _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", |
| blkoff / sizeof(union afs_dir_block), offset, |
| (offset < curr ? "skip" : "fill"), |
| nlen, dire->u.name); |
| |
| /* work out where the next possible entry is */ |
| for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { |
| if (next >= AFS_DIRENT_PER_BLOCK) { |
| _debug("ENT[%Zu.%u]:" |
| " %u travelled beyond end dir block" |
| " (len %u/%Zu)", |
| blkoff / sizeof(union afs_dir_block), |
| offset, next, tmp, nlen); |
| return -EIO; |
| } |
| if (!(block->pagehdr.bitmap[next / 8] & |
| (1 << (next % 8)))) { |
| _debug("ENT[%Zu.%u]:" |
| " %u unmarked extension (len %u/%Zu)", |
| blkoff / sizeof(union afs_dir_block), |
| offset, next, tmp, nlen); |
| return -EIO; |
| } |
| |
| _debug("ENT[%Zu.%u]: ext %u/%Zu", |
| blkoff / sizeof(union afs_dir_block), |
| next, tmp, nlen); |
| next++; |
| } |
| |
| /* skip if starts before the current position */ |
| if (offset < curr) |
| continue; |
| |
| /* found the next entry */ |
| if (!dir_emit(ctx, dire->u.name, nlen, |
| ntohl(dire->u.vnode), |
| ctx->actor == afs_lookup_filldir ? |
| ntohl(dire->u.unique) : DT_UNKNOWN)) { |
| _leave(" = 0 [full]"); |
| return 0; |
| } |
| |
| ctx->pos = blkoff + next * sizeof(union afs_dirent); |
| } |
| |
| _leave(" = 1 [more]"); |
| return 1; |
| } |
| |
| /* |
| * iterate through the data blob that lists the contents of an AFS directory |
| */ |
| static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
| struct key *key) |
| { |
| union afs_dir_block *dblock; |
| struct afs_dir_page *dbuf; |
| struct page *page; |
| unsigned blkoff, limit; |
| int ret; |
| |
| _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
| |
| if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
| _leave(" = -ESTALE"); |
| return -ESTALE; |
| } |
| |
| /* round the file position up to the next entry boundary */ |
| ctx->pos += sizeof(union afs_dirent) - 1; |
| ctx->pos &= ~(sizeof(union afs_dirent) - 1); |
| |
| /* walk through the blocks in sequence */ |
| ret = 0; |
| while (ctx->pos < dir->i_size) { |
| blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); |
| |
| /* fetch the appropriate page from the directory */ |
| page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); |
| if (IS_ERR(page)) { |
| ret = PTR_ERR(page); |
| break; |
| } |
| |
| limit = blkoff & ~(PAGE_SIZE - 1); |
| |
| dbuf = page_address(page); |
| |
| /* deal with the individual blocks stashed on this page */ |
| do { |
| dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / |
| sizeof(union afs_dir_block)]; |
| ret = afs_dir_iterate_block(ctx, dblock, blkoff); |
| if (ret != 1) { |
| afs_dir_put_page(page); |
| goto out; |
| } |
| |
| blkoff += sizeof(union afs_dir_block); |
| |
| } while (ctx->pos < dir->i_size && blkoff < limit); |
| |
| afs_dir_put_page(page); |
| ret = 0; |
| } |
| |
| out: |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * read an AFS directory |
| */ |
| static int afs_readdir(struct file *file, struct dir_context *ctx) |
| { |
| return afs_dir_iterate(file_inode(file), |
| ctx, file->private_data); |
| } |
| |
| /* |
| * search the directory for a name |
| * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
| * uniquifier through dtype |
| */ |
| static int afs_lookup_filldir(struct dir_context *ctx, const char *name, |
| int nlen, loff_t fpos, u64 ino, unsigned dtype) |
| { |
| struct afs_lookup_cookie *cookie = |
| container_of(ctx, struct afs_lookup_cookie, ctx); |
| |
| _enter("{%s,%u},%s,%u,,%llu,%u", |
| cookie->name.name, cookie->name.len, name, nlen, |
| (unsigned long long) ino, dtype); |
| |
| /* insanity checks first */ |
| BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); |
| BUILD_BUG_ON(sizeof(union afs_dirent) != 32); |
| |
| if (cookie->name.len != nlen || |
| memcmp(cookie->name.name, name, nlen) != 0) { |
| _leave(" = 0 [no]"); |
| return 0; |
| } |
| |
| cookie->fid.vnode = ino; |
| cookie->fid.unique = dtype; |
| cookie->found = 1; |
| |
| _leave(" = -1 [found]"); |
| return -1; |
| } |
| |
| /* |
| * do a lookup in a directory |
| * - just returns the FID the dentry name maps to if found |
| */ |
| static int afs_do_lookup(struct inode *dir, struct dentry *dentry, |
| struct afs_fid *fid, struct key *key) |
| { |
| struct afs_super_info *as = dir->i_sb->s_fs_info; |
| struct afs_lookup_cookie cookie = { |
| .ctx.actor = afs_lookup_filldir, |
| .name = dentry->d_name, |
| .fid.vid = as->volume->vid |
| }; |
| int ret; |
| |
| _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
| |
| /* search the directory */ |
| ret = afs_dir_iterate(dir, &cookie.ctx, key); |
| if (ret < 0) { |
| _leave(" = %d [iter]", ret); |
| return ret; |
| } |
| |
| ret = -ENOENT; |
| if (!cookie.found) { |
| _leave(" = -ENOENT [not found]"); |
| return -ENOENT; |
| } |
| |
| *fid = cookie.fid; |
| _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); |
| return 0; |
| } |
| |
| /* |
| * Try to auto mount the mountpoint with pseudo directory, if the autocell |
| * operation is setted. |
| */ |
| static struct inode *afs_try_auto_mntpt( |
| int ret, struct dentry *dentry, struct inode *dir, struct key *key, |
| struct afs_fid *fid) |
| { |
| const char *devname = dentry->d_name.name; |
| struct afs_vnode *vnode = AFS_FS_I(dir); |
| struct inode *inode; |
| |
| _enter("%d, %p{%pd}, {%x:%u}, %p", |
| ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key); |
| |
| if (ret != -ENOENT || |
| !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) |
| goto out; |
| |
| inode = afs_iget_autocell(dir, devname, strlen(devname), key); |
| if (IS_ERR(inode)) { |
| ret = PTR_ERR(inode); |
| goto out; |
| } |
| |
| *fid = AFS_FS_I(inode)->fid; |
| _leave("= %p", inode); |
| return inode; |
| |
| out: |
| _leave("= %d", ret); |
| return ERR_PTR(ret); |
| } |
| |
| /* |
| * look up an entry in a directory |
| */ |
| static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
| unsigned int flags) |
| { |
| struct afs_vnode *vnode; |
| struct afs_fid fid; |
| struct inode *inode; |
| struct key *key; |
| int ret; |
| |
| vnode = AFS_FS_I(dir); |
| |
| _enter("{%x:%u},%p{%pd},", |
| vnode->fid.vid, vnode->fid.vnode, dentry, dentry); |
| |
| ASSERTCMP(d_inode(dentry), ==, NULL); |
| |
| if (dentry->d_name.len >= AFSNAMEMAX) { |
| _leave(" = -ENAMETOOLONG"); |
| return ERR_PTR(-ENAMETOOLONG); |
| } |
| |
| if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
| _leave(" = -ESTALE"); |
| return ERR_PTR(-ESTALE); |
| } |
| |
| key = afs_request_key(vnode->volume->cell); |
| if (IS_ERR(key)) { |
| _leave(" = %ld [key]", PTR_ERR(key)); |
| return ERR_CAST(key); |
| } |
| |
| ret = afs_validate(vnode, key); |
| if (ret < 0) { |
| key_put(key); |
| _leave(" = %d [val]", ret); |
| return ERR_PTR(ret); |
| } |
| |
| ret = afs_do_lookup(dir, dentry, &fid, key); |
| if (ret < 0) { |
| inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); |
| if (!IS_ERR(inode)) { |
| key_put(key); |
| goto success; |
| } |
| |
| ret = PTR_ERR(inode); |
| key_put(key); |
| if (ret == -ENOENT) { |
| d_add(dentry, NULL); |
| _leave(" = NULL [negative]"); |
| return NULL; |
| } |
| _leave(" = %d [do]", ret); |
| return ERR_PTR(ret); |
| } |
| dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; |
| |
| /* instantiate the dentry */ |
| inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); |
| key_put(key); |
| if (IS_ERR(inode)) { |
| _leave(" = %ld", PTR_ERR(inode)); |
| return ERR_CAST(inode); |
| } |
| |
| success: |
| d_add(dentry, inode); |
| _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }", |
| fid.vnode, |
| fid.unique, |
| d_inode(dentry)->i_ino, |
| d_inode(dentry)->i_generation); |
| |
| return NULL; |
| } |
| |
| /* |
| * check that a dentry lookup hit has found a valid entry |
| * - NOTE! the hit can be a negative hit too, so we can't assume we have an |
| * inode |
| */ |
| static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
| { |
| struct afs_vnode *vnode, *dir; |
| struct afs_fid uninitialized_var(fid); |
| struct dentry *parent; |
| struct key *key; |
| void *dir_version; |
| int ret; |
| |
| if (flags & LOOKUP_RCU) |
| return -ECHILD; |
| |
| vnode = AFS_FS_I(d_inode(dentry)); |
| |
| if (d_really_is_positive(dentry)) |
| _enter("{v={%x:%u} n=%pd fl=%lx},", |
| vnode->fid.vid, vnode->fid.vnode, dentry, |
| vnode->flags); |
| else |
| _enter("{neg n=%pd}", dentry); |
| |
| key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
| if (IS_ERR(key)) |
| key = NULL; |
| |
| /* lock down the parent dentry so we can peer at it */ |
| parent = dget_parent(dentry); |
| dir = AFS_FS_I(d_inode(parent)); |
| |
| /* validate the parent directory */ |
| if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) |
| afs_validate(dir, key); |
| |
| if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { |
| _debug("%pd: parent dir deleted", dentry); |
| goto out_bad; |
| } |
| |
| dir_version = (void *) (unsigned long) dir->status.data_version; |
| if (dentry->d_fsdata == dir_version) |
| goto out_valid; /* the dir contents are unchanged */ |
| |
| _debug("dir modified"); |
| |
| /* search the directory for this vnode */ |
| ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); |
| switch (ret) { |
| case 0: |
| /* the filename maps to something */ |
| if (d_really_is_negative(dentry)) |
| goto out_bad; |
| if (is_bad_inode(d_inode(dentry))) { |
| printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
| dentry); |
| goto out_bad; |
| } |
| |
| /* if the vnode ID has changed, then the dirent points to a |
| * different file */ |
| if (fid.vnode != vnode->fid.vnode) { |
| _debug("%pd: dirent changed [%u != %u]", |
| dentry, fid.vnode, |
| vnode->fid.vnode); |
| goto not_found; |
| } |
| |
| /* if the vnode ID uniqifier has changed, then the file has |
| * been deleted and replaced, and the original vnode ID has |
| * been reused */ |
| if (fid.unique != vnode->fid.unique) { |
| _debug("%pd: file deleted (uq %u -> %u I:%u)", |
| dentry, fid.unique, |
| vnode->fid.unique, |
| d_inode(dentry)->i_generation); |
| spin_lock(&vnode->lock); |
| set_bit(AFS_VNODE_DELETED, &vnode->flags); |
| spin_unlock(&vnode->lock); |
| goto not_found; |
| } |
| goto out_valid; |
| |
| case -ENOENT: |
| /* the filename is unknown */ |
| _debug("%pd: dirent not found", dentry); |
| if (d_really_is_positive(dentry)) |
| goto not_found; |
| goto out_valid; |
| |
| default: |
| _debug("failed to iterate dir %pd: %d", |
| parent, ret); |
| goto out_bad; |
| } |
| |
| out_valid: |
| dentry->d_fsdata = dir_version; |
| dput(parent); |
| key_put(key); |
| _leave(" = 1 [valid]"); |
| return 1; |
| |
| /* the dirent, if it exists, now points to a different vnode */ |
| not_found: |
| spin_lock(&dentry->d_lock); |
| dentry->d_flags |= DCACHE_NFSFS_RENAMED; |
| spin_unlock(&dentry->d_lock); |
| |
| out_bad: |
| _debug("dropping dentry %pd2", dentry); |
| dput(parent); |
| key_put(key); |
| |
| _leave(" = 0 [bad]"); |
| return 0; |
| } |
| |
| /* |
| * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't |
| * sleep) |
| * - called from dput() when d_count is going to 0. |
| * - return 1 to request dentry be unhashed, 0 otherwise |
| */ |
| static int afs_d_delete(const struct dentry *dentry) |
| { |
| _enter("%pd", dentry); |
| |
| if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| goto zap; |
| |
| if (d_really_is_positive(dentry) && |
| (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || |
| test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) |
| goto zap; |
| |
| _leave(" = 0 [keep]"); |
| return 0; |
| |
| zap: |
| _leave(" = 1 [zap]"); |
| return 1; |
| } |
| |
| /* |
| * handle dentry release |
| */ |
| static void afs_d_release(struct dentry *dentry) |
| { |
| _enter("%pd", dentry); |
| } |
| |
| /* |
| * create a directory on an AFS filesystem |
| */ |
| static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| { |
| struct afs_file_status status; |
| struct afs_callback cb; |
| struct afs_server *server; |
| struct afs_vnode *dvnode, *vnode; |
| struct afs_fid fid; |
| struct inode *inode; |
| struct key *key; |
| int ret; |
| |
| dvnode = AFS_FS_I(dir); |
| |
| _enter("{%x:%u},{%pd},%ho", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| mode |= S_IFDIR; |
| ret = afs_vnode_create(dvnode, key, dentry->d_name.name, |
| mode, &fid, &status, &cb, &server); |
| if (ret < 0) |
| goto mkdir_error; |
| |
| inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); |
| if (IS_ERR(inode)) { |
| /* ENOMEM at a really inconvenient time - just abandon the new |
| * directory on the server */ |
| ret = PTR_ERR(inode); |
| goto iget_error; |
| } |
| |
| /* apply the status report we've got for the new vnode */ |
| vnode = AFS_FS_I(inode); |
| spin_lock(&vnode->lock); |
| vnode->update_cnt++; |
| spin_unlock(&vnode->lock); |
| afs_vnode_finalise_status_update(vnode, server); |
| afs_put_server(server); |
| |
| d_instantiate(dentry, inode); |
| if (d_unhashed(dentry)) { |
| _debug("not hashed"); |
| d_rehash(dentry); |
| } |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| iget_error: |
| afs_put_server(server); |
| mkdir_error: |
| key_put(key); |
| error: |
| d_drop(dentry); |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * remove a directory from an AFS filesystem |
| */ |
| static int afs_rmdir(struct inode *dir, struct dentry *dentry) |
| { |
| struct afs_vnode *dvnode, *vnode; |
| struct key *key; |
| int ret; |
| |
| dvnode = AFS_FS_I(dir); |
| |
| _enter("{%x:%u},{%pd}", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry); |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); |
| if (ret < 0) |
| goto rmdir_error; |
| |
| if (d_really_is_positive(dentry)) { |
| vnode = AFS_FS_I(d_inode(dentry)); |
| clear_nlink(&vnode->vfs_inode); |
| set_bit(AFS_VNODE_DELETED, &vnode->flags); |
| afs_discard_callback_on_delete(vnode); |
| } |
| |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| rmdir_error: |
| key_put(key); |
| error: |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * remove a file from an AFS filesystem |
| */ |
| static int afs_unlink(struct inode *dir, struct dentry *dentry) |
| { |
| struct afs_vnode *dvnode, *vnode; |
| struct key *key; |
| int ret; |
| |
| dvnode = AFS_FS_I(dir); |
| |
| _enter("{%x:%u},{%pd}", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry); |
| |
| ret = -ENAMETOOLONG; |
| if (dentry->d_name.len >= AFSNAMEMAX) |
| goto error; |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| if (d_really_is_positive(dentry)) { |
| vnode = AFS_FS_I(d_inode(dentry)); |
| |
| /* make sure we have a callback promise on the victim */ |
| ret = afs_validate(vnode, key); |
| if (ret < 0) |
| goto error; |
| } |
| |
| ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); |
| if (ret < 0) |
| goto remove_error; |
| |
| if (d_really_is_positive(dentry)) { |
| /* if the file wasn't deleted due to excess hard links, the |
| * fileserver will break the callback promise on the file - if |
| * it had one - before it returns to us, and if it was deleted, |
| * it won't |
| * |
| * however, if we didn't have a callback promise outstanding, |
| * or it was outstanding on a different server, then it won't |
| * break it either... |
| */ |
| vnode = AFS_FS_I(d_inode(dentry)); |
| if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) |
| _debug("AFS_VNODE_DELETED"); |
| if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) |
| _debug("AFS_VNODE_CB_BROKEN"); |
| set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); |
| ret = afs_validate(vnode, key); |
| _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
| } |
| |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| remove_error: |
| key_put(key); |
| error: |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * create a regular file on an AFS filesystem |
| */ |
| static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| bool excl) |
| { |
| struct afs_file_status status; |
| struct afs_callback cb; |
| struct afs_server *server; |
| struct afs_vnode *dvnode, *vnode; |
| struct afs_fid fid; |
| struct inode *inode; |
| struct key *key; |
| int ret; |
| |
| dvnode = AFS_FS_I(dir); |
| |
| _enter("{%x:%u},{%pd},%ho,", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| mode |= S_IFREG; |
| ret = afs_vnode_create(dvnode, key, dentry->d_name.name, |
| mode, &fid, &status, &cb, &server); |
| if (ret < 0) |
| goto create_error; |
| |
| inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); |
| if (IS_ERR(inode)) { |
| /* ENOMEM at a really inconvenient time - just abandon the new |
| * directory on the server */ |
| ret = PTR_ERR(inode); |
| goto iget_error; |
| } |
| |
| /* apply the status report we've got for the new vnode */ |
| vnode = AFS_FS_I(inode); |
| spin_lock(&vnode->lock); |
| vnode->update_cnt++; |
| spin_unlock(&vnode->lock); |
| afs_vnode_finalise_status_update(vnode, server); |
| afs_put_server(server); |
| |
| d_instantiate(dentry, inode); |
| if (d_unhashed(dentry)) { |
| _debug("not hashed"); |
| d_rehash(dentry); |
| } |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| iget_error: |
| afs_put_server(server); |
| create_error: |
| key_put(key); |
| error: |
| d_drop(dentry); |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * create a hard link between files in an AFS filesystem |
| */ |
| static int afs_link(struct dentry *from, struct inode *dir, |
| struct dentry *dentry) |
| { |
| struct afs_vnode *dvnode, *vnode; |
| struct key *key; |
| int ret; |
| |
| vnode = AFS_FS_I(d_inode(from)); |
| dvnode = AFS_FS_I(dir); |
| |
| _enter("{%x:%u},{%x:%u},{%pd}", |
| vnode->fid.vid, vnode->fid.vnode, |
| dvnode->fid.vid, dvnode->fid.vnode, |
| dentry); |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); |
| if (ret < 0) |
| goto link_error; |
| |
| ihold(&vnode->vfs_inode); |
| d_instantiate(dentry, &vnode->vfs_inode); |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| link_error: |
| key_put(key); |
| error: |
| d_drop(dentry); |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * create a symlink in an AFS filesystem |
| */ |
| static int afs_symlink(struct inode *dir, struct dentry *dentry, |
| const char *content) |
| { |
| struct afs_file_status status; |
| struct afs_server *server; |
| struct afs_vnode *dvnode, *vnode; |
| struct afs_fid fid; |
| struct inode *inode; |
| struct key *key; |
| int ret; |
| |
| dvnode = AFS_FS_I(dir); |
| |
| _enter("{%x:%u},{%pd},%s", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry, |
| content); |
| |
| ret = -EINVAL; |
| if (strlen(content) >= AFSPATHMAX) |
| goto error; |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, |
| &fid, &status, &server); |
| if (ret < 0) |
| goto create_error; |
| |
| inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); |
| if (IS_ERR(inode)) { |
| /* ENOMEM at a really inconvenient time - just abandon the new |
| * directory on the server */ |
| ret = PTR_ERR(inode); |
| goto iget_error; |
| } |
| |
| /* apply the status report we've got for the new vnode */ |
| vnode = AFS_FS_I(inode); |
| spin_lock(&vnode->lock); |
| vnode->update_cnt++; |
| spin_unlock(&vnode->lock); |
| afs_vnode_finalise_status_update(vnode, server); |
| afs_put_server(server); |
| |
| d_instantiate(dentry, inode); |
| if (d_unhashed(dentry)) { |
| _debug("not hashed"); |
| d_rehash(dentry); |
| } |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| iget_error: |
| afs_put_server(server); |
| create_error: |
| key_put(key); |
| error: |
| d_drop(dentry); |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * rename a file in an AFS filesystem and/or move it between directories |
| */ |
| static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry, |
| unsigned int flags) |
| { |
| struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
| struct key *key; |
| int ret; |
| |
| if (flags) |
| return -EINVAL; |
| |
| vnode = AFS_FS_I(d_inode(old_dentry)); |
| orig_dvnode = AFS_FS_I(old_dir); |
| new_dvnode = AFS_FS_I(new_dir); |
| |
| _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", |
| orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
| vnode->fid.vid, vnode->fid.vnode, |
| new_dvnode->fid.vid, new_dvnode->fid.vnode, |
| new_dentry); |
| |
| key = afs_request_key(orig_dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, |
| old_dentry->d_name.name, |
| new_dentry->d_name.name); |
| if (ret < 0) |
| goto rename_error; |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| rename_error: |
| key_put(key); |
| error: |
| d_drop(new_dentry); |
| _leave(" = %d", ret); |
| return ret; |
| } |