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fs/afs/dir.c
27.1 KB
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/* 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> |
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#include <linux/fs.h> |
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#include <linux/namei.h> |
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#include <linux/pagemap.h> |
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#include <linux/ctype.h> |
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#include <linux/sched.h> |
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#include "internal.h" |
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static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd); |
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static int afs_dir_open(struct inode *inode, struct file *file); |
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static int afs_readdir(struct file *file, void *dirent, filldir_t filldir); |
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static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); |
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static int afs_d_delete(const struct dentry *dentry); |
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static void afs_d_release(struct dentry *dentry); static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, |
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loff_t fpos, u64 ino, unsigned dtype); |
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static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
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struct nameidata *nd); |
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static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
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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); |
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const struct file_operations afs_dir_file_operations = { |
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.open = afs_dir_open, |
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.release = afs_release, |
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.readdir = afs_readdir, |
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.lock = afs_lock, |
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.llseek = generic_file_llseek, |
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}; |
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const struct inode_operations afs_dir_inode_operations = { |
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.create = afs_create, .lookup = afs_lookup, .link = afs_link, .unlink = afs_unlink, .symlink = afs_symlink, .mkdir = afs_mkdir, .rmdir = afs_rmdir, .rename = afs_rename, |
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.permission = afs_permission, |
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.getattr = afs_getattr, |
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.setattr = afs_setattr, |
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}; |
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const struct dentry_operations afs_fs_dentry_operations = { |
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.d_revalidate = afs_d_revalidate, .d_delete = afs_d_delete, |
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.d_release = afs_d_release, |
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.d_automount = afs_d_automount, |
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}; #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)]; }; |
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struct afs_lookup_cookie { |
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struct afs_fid fid; const char *name; size_t nlen; int found; }; |
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/* * check that a directory page is valid */ static inline void 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; |
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if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { |
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printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu ", |
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__func__, dir->i_ino, qty, |
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ntohs(dbuf->blocks[0].pagehdr.npages)); |
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goto error; } #endif /* determine how many magic numbers there should be in this page */ |
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latter = dir->i_size - page_offset(page); |
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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 ", |
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__func__, dir->i_ino, tmp, qty, |
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ntohs(dbuf->blocks[tmp].pagehdr.magic)); goto error; } } SetPageChecked(page); return; |
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error: |
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SetPageChecked(page); SetPageError(page); |
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} |
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/* * discard a page cached in the pagecache */ static inline void afs_dir_put_page(struct page *page) { kunmap(page); page_cache_release(page); |
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} |
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/* * get a page into the pagecache */ |
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static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, struct key *key) |
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{ struct page *page; |
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_enter("{%lu},%lu", dir->i_ino, index); |
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page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); |
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if (!IS_ERR(page)) { |
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kmap(page); |
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if (!PageChecked(page)) afs_dir_check_page(dir, page); if (PageError(page)) goto fail; } return page; |
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fail: |
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afs_dir_put_page(page); |
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_leave(" = -EIO"); |
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return ERR_PTR(-EIO); |
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} |
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|
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/* * open an AFS directory file */ static int afs_dir_open(struct inode *inode, struct file *file) { _enter("{%lu}", inode->i_ino); |
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BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); BUILD_BUG_ON(sizeof(union afs_dirent) != 32); |
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if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
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return -ENOENT; |
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return afs_open(inode, file); |
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} |
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/* * deal with one block in an AFS directory */ static int afs_dir_iterate_block(unsigned *fpos, union afs_dir_block *block, unsigned blkoff, void *cookie, filldir_t filldir) { union afs_dirent *dire; unsigned offset, next, curr; size_t nlen; int tmp, ret; _enter("%u,%x,%p,,",*fpos,blkoff,block); curr = (*fpos - 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)))) { |
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_debug("ENT[%Zu.%u]: unused", |
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blkoff / sizeof(union afs_dir_block), offset); if (offset >= curr) *fpos = 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)); |
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_debug("ENT[%Zu.%u]: %s %Zu \"%s\"", |
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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" |
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" (len %u/%Zu)", |
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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]:" |
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" %u unmarked extension (len %u/%Zu)", |
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blkoff / sizeof(union afs_dir_block), offset, next, tmp, nlen); return -EIO; } |
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_debug("ENT[%Zu.%u]: ext %u/%Zu", |
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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 */ ret = filldir(cookie, dire->u.name, nlen, blkoff + offset * sizeof(union afs_dirent), ntohl(dire->u.vnode), |
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filldir == afs_lookup_filldir ? |
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ntohl(dire->u.unique) : DT_UNKNOWN); if (ret < 0) { _leave(" = 0 [full]"); return 0; } *fpos = blkoff + next * sizeof(union afs_dirent); } _leave(" = 1 [more]"); return 1; |
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} |
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/* |
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* iterate through the data blob that lists the contents of an AFS directory |
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*/ static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, |
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filldir_t filldir, struct key *key) |
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{ |
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union afs_dir_block *dblock; |
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struct afs_dir_page *dbuf; struct page *page; unsigned blkoff, limit; int ret; _enter("{%lu},%u,,", dir->i_ino, *fpos); |
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if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
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_leave(" = -ESTALE"); return -ESTALE; } /* round the file position up to the next entry boundary */ *fpos += sizeof(union afs_dirent) - 1; *fpos &= ~(sizeof(union afs_dirent) - 1); /* walk through the blocks in sequence */ ret = 0; while (*fpos < dir->i_size) { blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); /* fetch the appropriate page from the directory */ |
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page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); |
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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(fpos, dblock, blkoff, cookie, filldir); if (ret != 1) { afs_dir_put_page(page); goto out; } blkoff += sizeof(union afs_dir_block); } while (*fpos < dir->i_size && blkoff < limit); afs_dir_put_page(page); ret = 0; } |
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out: |
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_leave(" = %d", ret); return ret; |
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} |
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/* * read an AFS directory */ |
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static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) |
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{ unsigned fpos; int ret; |
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_enter("{%Ld,{%lu}}", file->f_pos, file->f_path.dentry->d_inode->i_ino); |
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ASSERT(file->private_data != NULL); |
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fpos = file->f_pos; |
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ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, |
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cookie, filldir, file->private_data); |
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file->f_pos = fpos; _leave(" = %d", ret); return ret; |
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} |
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/* * search the directory for a name * - if afs_dir_iterate_block() spots this function, it'll pass the FID * uniquifier through dtype */ |
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static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, loff_t fpos, u64 ino, unsigned dtype) |
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{ |
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struct afs_lookup_cookie *cookie = _cookie; |
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_enter("{%s,%Zu},%s,%u,,%llu,%u", |
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cookie->name, cookie->nlen, name, nlen, (unsigned long long) ino, dtype); |
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/* insanity checks first */ BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); BUILD_BUG_ON(sizeof(union afs_dirent) != 32); |
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if (cookie->nlen != nlen || memcmp(cookie->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; |
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} |
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/* |
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* do a lookup in a directory |
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* - just returns the FID the dentry name maps to if found |
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*/ |
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static int afs_do_lookup(struct inode *dir, struct dentry *dentry, |
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struct afs_fid *fid, struct key *key) |
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{ |
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struct afs_lookup_cookie cookie; |
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struct afs_super_info *as; |
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unsigned fpos; int ret; |
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_enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); |
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as = dir->i_sb->s_fs_info; /* search the directory */ cookie.name = dentry->d_name.name; cookie.nlen = dentry->d_name.len; cookie.fid.vid = as->volume->vid; cookie.found = 0; fpos = 0; |
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ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, |
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key); |
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if (ret < 0) { |
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_leave(" = %d [iter]", ret); return ret; |
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} ret = -ENOENT; if (!cookie.found) { |
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_leave(" = -ENOENT [not found]"); return -ENOENT; |
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} |
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*fid = cookie.fid; _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); return 0; } /* |
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* 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{%s}, {%x:%u}, %p", ret, dentry, devname, 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); } /* |
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* look up an entry in a directory */ |
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static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
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{ struct afs_vnode *vnode; struct afs_fid fid; struct inode *inode; |
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struct key *key; |
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int ret; |
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vnode = AFS_FS_I(dir); |
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_enter("{%x:%u},%p{%s},", |
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vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); ASSERTCMP(dentry->d_inode, ==, NULL); |
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if (dentry->d_name.len >= AFSNAMEMAX) { |
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_leave(" = -ENAMETOOLONG"); return ERR_PTR(-ENAMETOOLONG); } |
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if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { _leave(" = -ESTALE"); return ERR_PTR(-ESTALE); } |
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key = afs_request_key(vnode->volume->cell); if (IS_ERR(key)) { _leave(" = %ld [key]", PTR_ERR(key)); |
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return ERR_CAST(key); |
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} |
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ret = afs_validate(vnode, key); if (ret < 0) { key_put(key); _leave(" = %d [val]", ret); return ERR_PTR(ret); } |
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ret = afs_do_lookup(dir, dentry, &fid, key); |
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if (ret < 0) { |
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inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); if (!IS_ERR(inode)) { key_put(key); goto success; } ret = PTR_ERR(inode); |
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key_put(key); |
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if (ret == -ENOENT) { d_add(dentry, NULL); _leave(" = NULL [negative]"); return NULL; } |
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_leave(" = %d [do]", ret); |
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return ERR_PTR(ret); } |
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dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; |
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/* instantiate the dentry */ |
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|
554 |
inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); |
00d3b7a45
|
555 |
key_put(key); |
08e0e7c82
|
556 557 |
if (IS_ERR(inode)) { _leave(" = %ld", PTR_ERR(inode)); |
e231c2ee6
|
558 |
return ERR_CAST(inode); |
08e0e7c82
|
559 |
} |
bec5eb614
|
560 |
success: |
1da177e4c
|
561 |
d_add(dentry, inode); |
d6e43f751
|
562 |
_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }", |
08e0e7c82
|
563 564 |
fid.vnode, fid.unique, |
1da177e4c
|
565 |
dentry->d_inode->i_ino, |
d6e43f751
|
566 |
dentry->d_inode->i_generation); |
1da177e4c
|
567 568 |
return NULL; |
ec26815ad
|
569 |
} |
1da177e4c
|
570 |
|
1da177e4c
|
571 572 573 574 |
/* * 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 |
1da177e4c
|
575 576 577 |
*/ static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) { |
260a98031
|
578 |
struct afs_vnode *vnode, *dir; |
dd0d9a46f
|
579 |
struct afs_fid uninitialized_var(fid); |
1da177e4c
|
580 |
struct dentry *parent; |
00d3b7a45
|
581 |
struct key *key; |
260a98031
|
582 |
void *dir_version; |
1da177e4c
|
583 |
int ret; |
34286d666
|
584 585 |
if (nd->flags & LOOKUP_RCU) return -ECHILD; |
08e0e7c82
|
586 |
vnode = AFS_FS_I(dentry->d_inode); |
260a98031
|
587 588 589 590 591 592 |
if (dentry->d_inode) _enter("{v={%x:%u} n=%s fl=%lx},", vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, vnode->flags); else _enter("{neg n=%s}", dentry->d_name.name); |
1da177e4c
|
593 |
|
260a98031
|
594 |
key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
00d3b7a45
|
595 596 |
if (IS_ERR(key)) key = NULL; |
1da177e4c
|
597 |
/* lock down the parent dentry so we can peer at it */ |
08e0e7c82
|
598 |
parent = dget_parent(dentry); |
260a98031
|
599 |
if (!parent->d_inode) |
1da177e4c
|
600 |
goto out_bad; |
260a98031
|
601 |
dir = AFS_FS_I(parent->d_inode); |
1da177e4c
|
602 |
|
260a98031
|
603 604 605 606 607 |
/* validate the parent directory */ if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) afs_validate(dir, key); if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { |
1da177e4c
|
608 609 610 |
_debug("%s: parent dir deleted", dentry->d_name.name); goto out_bad; } |
260a98031
|
611 612 613 |
dir_version = (void *) (unsigned long) dir->status.data_version; if (dentry->d_fsdata == dir_version) goto out_valid; /* the dir contents are unchanged */ |
1da177e4c
|
614 |
|
260a98031
|
615 616 617 618 619 620 621 622 623 624 625 626 627 |
_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 (!dentry->d_inode) goto out_bad; if (is_bad_inode(dentry->d_inode)) { printk("kAFS: afs_d_revalidate: %s/%s has bad inode ", parent->d_name.name, dentry->d_name.name); |
1da177e4c
|
628 629 |
goto out_bad; } |
1da177e4c
|
630 631 |
/* if the vnode ID has changed, then the dirent points to a * different file */ |
08e0e7c82
|
632 633 634 635 |
if (fid.vnode != vnode->fid.vnode) { _debug("%s: dirent changed [%u != %u]", dentry->d_name.name, fid.vnode, vnode->fid.vnode); |
1da177e4c
|
636 637 638 639 |
goto not_found; } /* if the vnode ID uniqifier has changed, then the file has |
260a98031
|
640 641 |
* been deleted and replaced, and the original vnode ID has * been reused */ |
08e0e7c82
|
642 |
if (fid.unique != vnode->fid.unique) { |
d6e43f751
|
643 |
_debug("%s: file deleted (uq %u -> %u I:%u)", |
08e0e7c82
|
644 |
dentry->d_name.name, fid.unique, |
7a224228e
|
645 |
vnode->fid.unique, |
d6e43f751
|
646 |
dentry->d_inode->i_generation); |
08e0e7c82
|
647 648 649 |
spin_lock(&vnode->lock); set_bit(AFS_VNODE_DELETED, &vnode->flags); spin_unlock(&vnode->lock); |
260a98031
|
650 |
goto not_found; |
1da177e4c
|
651 |
} |
260a98031
|
652 |
goto out_valid; |
08e0e7c82
|
653 |
|
260a98031
|
654 655 656 657 658 659 |
case -ENOENT: /* the filename is unknown */ _debug("%s: dirent not found", dentry->d_name.name); if (dentry->d_inode) goto not_found; goto out_valid; |
1da177e4c
|
660 |
|
260a98031
|
661 662 663 |
default: _debug("failed to iterate dir %s: %d", parent->d_name.name, ret); |
08e0e7c82
|
664 665 |
goto out_bad; } |
ec26815ad
|
666 |
out_valid: |
260a98031
|
667 668 |
dentry->d_fsdata = dir_version; out_skip: |
1da177e4c
|
669 |
dput(parent); |
00d3b7a45
|
670 |
key_put(key); |
1da177e4c
|
671 672 673 674 |
_leave(" = 1 [valid]"); return 1; /* the dirent, if it exists, now points to a different vnode */ |
ec26815ad
|
675 |
not_found: |
1da177e4c
|
676 677 678 |
spin_lock(&dentry->d_lock); dentry->d_flags |= DCACHE_NFSFS_RENAMED; spin_unlock(&dentry->d_lock); |
ec26815ad
|
679 |
out_bad: |
260a98031
|
680 |
if (dentry->d_inode) { |
1da177e4c
|
681 682 |
/* don't unhash if we have submounts */ if (have_submounts(dentry)) |
260a98031
|
683 |
goto out_skip; |
1da177e4c
|
684 |
} |
1da177e4c
|
685 |
_debug("dropping dentry %s/%s", |
08e0e7c82
|
686 687 |
parent->d_name.name, dentry->d_name.name); shrink_dcache_parent(dentry); |
1da177e4c
|
688 |
d_drop(dentry); |
1da177e4c
|
689 |
dput(parent); |
00d3b7a45
|
690 |
key_put(key); |
1da177e4c
|
691 692 693 |
_leave(" = 0 [bad]"); return 0; |
ec26815ad
|
694 |
} |
1da177e4c
|
695 |
|
1da177e4c
|
696 697 698 699 700 701 |
/* * 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 */ |
fe15ce446
|
702 |
static int afs_d_delete(const struct dentry *dentry) |
1da177e4c
|
703 704 705 706 707 |
{ _enter("%s", dentry->d_name.name); if (dentry->d_flags & DCACHE_NFSFS_RENAMED) goto zap; |
08e0e7c82
|
708 |
if (dentry->d_inode && |
bec5eb614
|
709 710 711 |
(test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags) || test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(dentry->d_inode)->flags))) goto zap; |
1da177e4c
|
712 713 714 |
_leave(" = 0 [keep]"); return 0; |
ec26815ad
|
715 |
zap: |
1da177e4c
|
716 717 |
_leave(" = 1 [zap]"); return 1; |
ec26815ad
|
718 |
} |
260a98031
|
719 720 721 722 723 724 725 726 727 728 729 730 |
/* * handle dentry release */ static void afs_d_release(struct dentry *dentry) { _enter("%s", dentry->d_name.name); } /* * create a directory on an AFS filesystem */ |
18bb1db3e
|
731 |
static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
260a98031
|
732 733 734 735 736 737 738 739 740 741 742 |
{ 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); |
18bb1db3e
|
743 |
_enter("{%x:%u},{%s},%ho", |
260a98031
|
744 745 746 |
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); ret = -ENAMETOOLONG; |
45222b9e0
|
747 |
if (dentry->d_name.len >= AFSNAMEMAX) |
260a98031
|
748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 |
goto error; 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); |
416351f28
|
807 |
_enter("{%x:%u},{%s}", |
260a98031
|
808 809 810 |
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); ret = -ENAMETOOLONG; |
45222b9e0
|
811 |
if (dentry->d_name.len >= AFSNAMEMAX) |
260a98031
|
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 |
goto error; 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 (dentry->d_inode) { vnode = AFS_FS_I(dentry->d_inode); 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); |
416351f28
|
852 |
_enter("{%x:%u},{%s}", |
260a98031
|
853 854 855 |
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); ret = -ENAMETOOLONG; |
45222b9e0
|
856 |
if (dentry->d_name.len >= AFSNAMEMAX) |
260a98031
|
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 |
goto error; key = afs_request_key(dvnode->volume->cell); if (IS_ERR(key)) { ret = PTR_ERR(key); goto error; } if (dentry->d_inode) { vnode = AFS_FS_I(dentry->d_inode); /* 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 (dentry->d_inode) { /* 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(dentry->d_inode); 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 */ |
4acdaf27e
|
912 |
static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
260a98031
|
913 914 915 916 917 918 919 920 921 922 923 924 |
struct nameidata *nd) { 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); |
4acdaf27e
|
925 |
_enter("{%x:%u},{%s},%ho,", |
260a98031
|
926 927 928 |
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); ret = -ENAMETOOLONG; |
45222b9e0
|
929 |
if (dentry->d_name.len >= AFSNAMEMAX) |
260a98031
|
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 |
goto error; 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(from->d_inode); dvnode = AFS_FS_I(dir); |
416351f28
|
991 |
_enter("{%x:%u},{%x:%u},{%s}", |
260a98031
|
992 993 994 995 996 |
vnode->fid.vid, vnode->fid.vnode, dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); ret = -ENAMETOOLONG; |
45222b9e0
|
997 |
if (dentry->d_name.len >= AFSNAMEMAX) |
260a98031
|
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 |
goto error; 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; |
7de9c6ee3
|
1009 |
ihold(&vnode->vfs_inode); |
260a98031
|
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 |
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); |
416351f28
|
1038 |
_enter("{%x:%u},{%s},%s", |
260a98031
|
1039 1040 1041 1042 |
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, content); ret = -ENAMETOOLONG; |
45222b9e0
|
1043 |
if (dentry->d_name.len >= AFSNAMEMAX) |
260a98031
|
1044 1045 1046 |
goto error; ret = -EINVAL; |
45222b9e0
|
1047 |
if (strlen(content) >= AFSPATHMAX) |
260a98031
|
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 |
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) { struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; struct key *key; int ret; vnode = AFS_FS_I(old_dentry->d_inode); orig_dvnode = AFS_FS_I(old_dir); new_dvnode = AFS_FS_I(new_dir); |
416351f28
|
1109 |
_enter("{%x:%u},{%x:%u},{%x:%u},{%s}", |
260a98031
|
1110 1111 1112 1113 1114 1115 |
orig_dvnode->fid.vid, orig_dvnode->fid.vnode, vnode->fid.vid, vnode->fid.vnode, new_dvnode->fid.vid, new_dvnode->fid.vnode, new_dentry->d_name.name); ret = -ENAMETOOLONG; |
45222b9e0
|
1116 |
if (new_dentry->d_name.len >= AFSNAMEMAX) |
260a98031
|
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 |
goto error; 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; } |