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* linux/fs/nfs/dir.c
*
* Copyright (C) 1992 Rick Sladkey
*
* nfs directory handling functions
*
* 10 Apr 1996 Added silly rename for unlink --okir
* 28 Sep 1996 Improved directory cache --okir
* 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de
* Re-implemented silly rename for unlink, newly implemented
* silly rename for nfs_rename() following the suggestions
* of Olaf Kirch (okir) found in this file.
* Following Linus comments on my original hack, this version
* depends only on the dcache stuff and doesn't touch the inode
* layer (iput() and friends).
* 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM
* 7 Oct 1999 Rewrite of Dave's readdir stuff for NFSv3 support, and in order
* to simplify cookie handling. -Trond
*/
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/malloc.h>
#include <asm/pgtable.h>
#include <linux/mm.h>
#include <linux/sunrpc/types.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/clnt.h>
#include <asm/segment.h> /* for fs functions */
#define NFS_PARANOIA 1
/* #define NFS_DEBUG_VERBOSE 1 */
static int nfs_safe_remove(struct dentry *);
static ssize_t nfs_dir_read(struct file *, char *, size_t, loff_t *);
static int nfs_readdir(struct file *, void *, filldir_t);
static struct dentry *nfs_lookup(struct inode *, struct dentry *);
static int nfs_create(struct inode *, struct dentry *, int);
static int nfs_mkdir(struct inode *, struct dentry *, int);
static int nfs_rmdir(struct inode *, struct dentry *);
static int nfs_unlink(struct inode *, struct dentry *);
static int nfs_symlink(struct inode *, struct dentry *, const char *);
static int nfs_link(struct dentry *, struct inode *, struct dentry *);
static int nfs_mknod(struct inode *, struct dentry *, int, int);
static int nfs_rename(struct inode *, struct dentry *,
struct inode *, struct dentry *);
static struct file_operations nfs_dir_operations = {
NULL, /* lseek - default */
nfs_dir_read, /* read - bad */
NULL, /* write - bad */
nfs_readdir, /* readdir */
NULL, /* select - default */
NULL, /* ioctl - default */
NULL, /* mmap */
nfs_open, /* open */
NULL, /* flush */
nfs_release, /* release */
NULL /* fsync */
};
struct inode_operations nfs_dir_inode_operations = {
&nfs_dir_operations, /* default directory file-ops */
nfs_create, /* create */
nfs_lookup, /* lookup */
nfs_link, /* link */
nfs_unlink, /* unlink */
nfs_symlink, /* symlink */
nfs_mkdir, /* mkdir */
nfs_rmdir, /* rmdir */
nfs_mknod, /* mknod */
nfs_rename, /* rename */
NULL, /* readlink */
NULL, /* follow_link */
NULL, /* readpage */
NULL, /* writepage */
NULL, /* bmap */
NULL, /* truncate */
nfs_permission, /* permission */
NULL, /* smap */
NULL, /* updatepage */
nfs_revalidate, /* revalidate */
};
static ssize_t
nfs_dir_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
return -EISDIR;
}
typedef u32 * (*decode_dirent_t)(u32 *, struct nfs_entry *, int);
typedef struct {
struct file *file;
struct page *page;
unsigned long page_index;
unsigned page_offset;
u64 target;
struct nfs_entry *entry;
decode_dirent_t decode;
int plus;
int error;
} nfs_readdir_descriptor_t;
/* Now we cache directories properly, by stuffing the dirent
* data directly in the page cache.
*
* Inode invalidation due to refresh etc. takes care of
* _everything_, no sloppy entry flushing logic, no extraneous
* copying, network direct to page cache, the way it was meant
* to be.
*
* NOTE: Dirent information verification is done always by the
* page-in of the RPC reply, nowhere else, this simplies
* things substantially.
*/
static
int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
{
struct file *file = desc->file;
struct dentry *dir = file->f_dentry;
struct inode *inode = dir->d_inode;
struct nfs_fattr dir_attr;
void *buffer = (void *)page_address(page);
int plus = NFS_USE_READDIRPLUS(inode);
int error;
dfprintk(VFS, "NFS: nfs_readdir_filler() reading cookie %Lu into page %lu.\n", (long long)desc->entry->cookie, page->offset);
again:
error = NFS_CALL(readdir, inode, (dir, &dir_attr,
nfs_file_cred(file),
desc->entry->cookie, buffer,
NFS_SERVER(inode)->dtsize, plus));
nfs_refresh_inode(inode, &dir_attr);
/* We requested READDIRPLUS, but the server doesn't grok it */
if (desc->plus && error == -ENOTSUPP) {
NFS_FLAGS(inode) &= ~NFS_INO_ADVISE_RDPLUS;
plus = 0;
goto again;
}
if (error < 0)
goto error;
flush_dcache_page(page_address(page)); /* Is this correct? */
set_bit(PG_uptodate, &page->flags);
/* Ensure consistent page alignment of the data.
* Note: assumes we have exclusive access to this inode either
* throught inode->i_sem or some other mechanism.
*/
if (page->offset == 0)
invalidate_inode_pages(inode);
nfs_unlock_page(page);
return 0;
error:
set_bit(PG_error, &page->flags);
nfs_unlock_page(page);
desc->error = error;
return -EIO;
}
/*
* Given a pointer to a buffer that has already been filled by a call
* to readdir, find the next entry.
*
* If the end of the buffer has been reached, return -EAGAIN, if not,
* return the offset within the buffer of the next entry to be
* read.
*/
static inline
int find_dirent(nfs_readdir_descriptor_t *desc, struct page *page)
{
struct nfs_entry *entry = desc->entry;
char *start = (char *)page_address(page),
*p = start;
int loop_count = 0,
status = 0;
for(;;) {
p = (char *)desc->decode((u32*)p, entry, desc->plus);
if (IS_ERR(p)) {
status = PTR_ERR(p);
break;
}
desc->page_offset = p - start;
dfprintk(VFS, "NFS: found cookie %Lu\n", (long long)entry->cookie);
if (entry->prev_cookie == desc->target)
break;
if (loop_count++ > 200) {
loop_count = 0;
schedule();
}
}
dfprintk(VFS, "NFS: find_dirent() returns %d\n", status);
return status;
}
/*
* Find the given page, and call find_dirent() in order to try to
* return the next entry.
*/
static inline
int find_dirent_page(nfs_readdir_descriptor_t *desc)
{
struct inode *inode = desc->file->f_dentry->d_inode;
struct page *page;
unsigned long index = desc->page_index;
int status;
dfprintk(VFS, "NFS: find_dirent_page() searching directory page %ld\n", desc->page_index);
if (desc->page) {
page_cache_release(desc->page);
desc->page = NULL;
}
page = read_cache_page(inode, index,
(filler_t *)nfs_readdir_filler, desc);
if (IS_ERR(page)) {
status = PTR_ERR(page);
goto out;
}
/* NOTE: Someone else may have changed the READDIRPLUS flag */
desc->plus = NFS_USE_READDIRPLUS(inode);
status = find_dirent(desc, page);
if (status >= 0)
desc->page = page;
else
page_cache_release(page);
out:
dfprintk(VFS, "NFS: find_dirent_page() returns %d\n", status);
return status;
}
/*
* Recurse through the page cache pages, and return a
* filled nfs_entry structure of the next directory entry if possible.
*
* The target for the search is 'desc->target'.
*/
static inline
int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
{
int res = 0;
int loop_count = 0;
dfprintk(VFS, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", (long long)desc->target);
for (;;) {
res = find_dirent_page(desc);
if (res != -EAGAIN)
break;
/* Align to beginning of next page */
desc->page_offset = 0;
desc->page_index += PAGE_CACHE_SIZE;
if (loop_count++ > 200) {
loop_count = 0;
schedule();
}
}
dfprintk(VFS, "NFS: readdir_search_pagecache() returned %d\n", res);
return res;
}
/*
* Once we've found the start of the dirent within a page: fill 'er up...
*/
static
int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent,
filldir_t filldir)
{
struct file *file = desc->file;
struct nfs_entry *entry = desc->entry;
char *start = (char *)page_address(desc->page),
*p = start + desc->page_offset;
unsigned long fileid;
int loop_count = 0,
res = 0;
dfprintk(VFS, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n", (long long)desc->target);
for(;;) {
/* Note: entry->prev_cookie contains the cookie for
* retrieving the current dirent on the server */
fileid = nfs_fileid_to_ino_t(entry->ino);
res = filldir(dirent, entry->name, entry->len,
entry->prev_cookie, fileid);
if (res < 0)
break;
file->f_pos = desc->target = entry->cookie;
p = (char *)desc->decode((u32 *)p, entry, desc->plus);
if (IS_ERR(p)) {
if (PTR_ERR(p) == -EAGAIN) {
desc->page_offset = 0;
desc->page_index += PAGE_CACHE_SIZE;
}
break;
}
desc->page_offset = p - start;
if (loop_count++ > 200) {
loop_count = 0;
schedule();
}
}
page_cache_release(desc->page);
desc->page = NULL;
dfprintk(VFS, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", (long long)desc->target, res);
return res;
}
/*
* If we cannot find a cookie in our cache, we suspect that this is
* because it points to a deleted file, so we ask the server to return
* whatever it thinks is the next entry. We then feed this to filldir.
* If all goes well, we should then be able to find our way round the
* cache on the next call to readdir_search_pagecache();
*
* NOTE: we cannot add the anonymous page to the pagecache because
* the data it contains might not be page aligned. Besides,
* we should already have a complete representation of the
* directory in the page cache by the time we get here.
*/
static inline
int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent,
filldir_t filldir)
{
struct file *file = desc->file;
struct dentry *dir = file->f_dentry;
struct inode *inode = dir->d_inode;
struct nfs_fattr dir_attr;
struct page *page = NULL;
unsigned long cache_page;
u32 *p;
int status = -EIO;
dfprintk(VFS, "NFS: uncached_readdir() searching for cookie %Lu\n", (long long)desc->target);
if (desc->page) {
page_cache_release(desc->page);
desc->page = NULL;
}
cache_page = page_cache_alloc();
if (!cache_page) {
status = -ENOMEM;
goto out;
}
page = page_cache_entry(cache_page);
p = (u32 *)page_address(page);
status = NFS_CALL(readdir, inode, (dir, &dir_attr,
nfs_file_cred(file),
desc->target, p,
NFS_SERVER(inode)->dtsize, 0));
nfs_refresh_inode(inode, &dir_attr);
if (status >= 0) {
p = desc->decode(p, desc->entry, 0);
if (IS_ERR(p))
status = PTR_ERR(p);
else
desc->entry->prev_cookie = desc->target;
}
if (status < 0)
goto out_release;
desc->page_index = 0;
desc->page_offset = 0;
desc->page = page;
status = nfs_do_filldir(desc, dirent, filldir);
/* Reset read descriptor so it searches the page cache from
* the start upon the next call to readdir_search_pagecache() */
desc->page_index = 0;
desc->page_offset = 0;
memset(desc->entry, 0, sizeof(*desc->entry));
out:
dfprintk(VFS, "NFS: uncached_readdir() returns %d\n", status);
return status;
out_release:
page_cache_release(page);
goto out;
}
/* The file offset position is now represented as a true offset into the
* page cache as is the case in most of the other filesystems.
*/
static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct dentry *dentry = filp->f_dentry;
struct inode *inode = dentry->d_inode;
nfs_readdir_descriptor_t my_desc,
*desc = &my_desc;
struct nfs_entry my_entry;
long res;
res = nfs_revalidate(dentry);
if (res < 0)
return res;
/*
* filp->f_pos points to the file offset in the page cache.
* but if the cache has meanwhile been zapped, we need to
* read from the last dirent to revalidate f_pos
* itself.
*/
memset(desc, 0, sizeof(*desc));
memset(&my_entry, 0, sizeof(my_entry));
desc->file = filp;
desc->target = filp->f_pos;
desc->entry = &my_entry;
desc->decode = NFS_PROTO(inode)->decode_dirent;
while(!desc->entry->eof) {
res = readdir_search_pagecache(desc);
if (res == -EBADCOOKIE) {
/* This means either end of directory */
if (desc->entry->cookie == desc->target) {
res = 0;
break;
}
/* Or that the server has 'lost' a cookie */
res = uncached_readdir(desc, dirent, filldir);
if (res >= 0)
continue;
}
if (res < 0)
break;
res = nfs_do_filldir(desc, dirent, filldir);
if (res < 0) {
res = 0;
break;
}
}
if (desc->page)
page_cache_release(desc->page);
if (desc->error < 0)
return desc->error;
if (res < 0)
return res;
return 0;
}
/*
* Whenever an NFS operation succeeds, we know that the dentry
* is valid, so we update the revalidation timestamp.
*/
static inline void
nfs_renew_times(struct dentry * dentry)
{
dentry->d_time = jiffies;
}
static inline int nfs_dentry_force_reval(struct dentry *dentry, int flags)
{
struct inode *inode = dentry->d_inode;
unsigned long timeout = NFS_ATTRTIMEO(inode);
/*
* If it's the last lookup in a series, we use a stricter
* cache consistency check by looking at the parent mtime.
*
* If it's been modified in the last hour, be really strict.
* (This still means that we can avoid doing unnecessary
* work on directories like /usr/share/bin etc which basically
* never change).
*/
if (!(flags & LOOKUP_CONTINUE)) {
long diff = CURRENT_TIME - dentry->d_parent->d_inode->i_mtime;
if (diff < 15*60)
timeout = 0;
}
return time_after(jiffies,dentry->d_time + timeout);
}
/*
* We judge how long we want to trust negative
* dentries by looking at the parent inode mtime.
*
* If mtime is close to present time, we revalidate
* more often.
*/
#define NFS_REVALIDATE_NEGATIVE (1 * HZ)
static inline int nfs_neg_need_reval(struct dentry *dentry)
{
struct inode *dir = dentry->d_parent->d_inode;
unsigned long timeout = NFS_ATTRTIMEO(dir);
long diff = CURRENT_TIME - dir->i_mtime;
if (diff < 5*60 && timeout > NFS_REVALIDATE_NEGATIVE)
timeout = NFS_REVALIDATE_NEGATIVE;
return time_after(jiffies, dentry->d_time + timeout);
}
/*
* This is called every time the dcache has a lookup hit,
* and we should check whether we can really trust that
* lookup.
*
* NOTE! The hit can be a negative hit too, don't assume
* we have an inode!
*
* If the dentry is older than the revalidation interval,
* we do a new lookup and verify that the dentry is still
* correct.
*/
static int nfs_lookup_revalidate(struct dentry * dentry, int flags)
{
struct dentry *dir = dentry->d_parent;
struct inode *inode = dentry->d_inode,
*dir_i = dir->d_inode;
struct nfs_fh fhandle;
struct nfs_fattr fattr, dir_attr;
int error;
/*
* If we don't have an inode, let's look at the parent
* directory mtime to get a hint about how often we
* should validate things..
*/
if (!inode) {
if (nfs_neg_need_reval(dentry))
goto out_bad;
goto out_valid;
}
if (is_bad_inode(inode)) {
dfprintk(VFS, "nfs_lookup_validate: %s/%s has dud inode\n",
dir->d_name.name, dentry->d_name.name);
goto out_bad;
}
if (!nfs_dentry_force_reval(dentry, flags))
goto out_valid;
if (IS_ROOT(dentry)) {
__nfs_revalidate_inode(dentry);
goto out_valid_renew;
}
if (NFS_FLAGS(inode) & NFS_INO_STALE)
goto out_bad;
/*
* Do a new lookup and check the dentry attributes.
*/
error = NFS_CALL(lookup, dir_i, (dir, &dir_attr,
&dentry->d_name, &fhandle, &fattr));
if (error < 0)
goto out_bad;
/* Inode number matches? */
if (!(fattr.valid & NFS_ATTR_FATTR) ||
NFS_FSID(inode) != fattr.fsid ||
NFS_FILEID(inode) != fattr.fileid)
goto out_bad;
/* Filehandle matches? */
if (NFS_FH(dentry)->size == 0)
goto out_bad;
if (NFS_FH(dentry)->size != fhandle.size ||
memcmp(NFS_FH(dentry)->data, fhandle.data, fhandle.size))
goto out_bad;
/* Ok, remeber that we successfully checked it.. */
nfs_refresh_inode(inode, &fattr);
nfs_refresh_inode(dir_i, &dir_attr);
out_valid_renew:
nfs_renew_times(dentry);
out_valid:
return 1;
out_bad:
if (!list_empty(&dentry->d_subdirs))
shrink_dcache_parent(dentry);
/* If we have submounts, don't unhash ! */
if (have_submounts(dentry))
goto out_valid;
d_drop(dentry);
if (dentry->d_parent->d_inode)
NFS_CACHEINV(dentry->d_parent->d_inode);
if (inode && S_ISDIR(inode->i_mode))
NFS_CACHEINV(inode);
return 0;
}
/*
* This is called from dput() when d_count is going to 0.
*/
static void nfs_dentry_delete(struct dentry *dentry)
{
if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
/* Unhash it, so that ->d_iput() would be called */
d_drop(dentry);
}
}
__inline__ struct nfs_fh *nfs_fh_alloc(void)
{
struct nfs_fh *p;
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return NULL;
memset(p, 0, sizeof(*p));
return p;
}
__inline__ void nfs_fh_free(struct nfs_fh *p)
{
kfree(p);
}
/*
* Called when the dentry is being freed to release private memory.
*/
static void nfs_dentry_release(struct dentry *dentry)
{
if (dentry->d_fsdata) {
nfs_fh_free(dentry->d_fsdata);
dentry->d_fsdata = NULL;
}
}
/*
* Called when the dentry loses inode.
* We use it to clean up silly-renamed files.
*/
static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode)
{
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
nfs_complete_unlink(dentry);
iput(inode);
}
struct dentry_operations nfs_dentry_operations = {
nfs_lookup_revalidate, /* d_revalidate(struct dentry *, int) */
NULL, /* d_hash */
NULL, /* d_compare */
nfs_dentry_delete, /* d_delete(struct dentry *) */
nfs_dentry_release, /* d_release(struct dentry *) */
nfs_dentry_iput /* d_iput */
};
static struct dentry *nfs_lookup(struct inode *dir_i, struct dentry * dentry)
{
struct dentry *dir = dentry->d_parent;
struct inode *inode;
int error;
struct nfs_fh fhandle;
struct nfs_fattr fattr, dir_attr;
dfprintk(VFS, "NFS: lookup(%s/%s)\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
error = -ENAMETOOLONG;
if (dentry->d_name.len > NFS_SERVER(dir_i)->namelen)
goto out;
dentry->d_op = &nfs_dentry_operations;
if (!dentry->d_fsdata) {
dentry->d_fsdata = nfs_fh_alloc();
if (!dentry->d_fsdata) {
error = -ENOMEM;
goto out;
}
}
#if NFS_FIXME
inode = nfs_dircache_lookup(dir_i, dentry);
if (inode)
goto no_entry;
#endif
error = NFS_CALL(lookup, dir_i, (dir, &dir_attr,
&dentry->d_name, &fhandle, &fattr));
nfs_refresh_inode(dir_i, &dir_attr);
inode = NULL;
if (error == -ENOENT)
goto no_entry;
if (!error) {
error = -EACCES;
inode = nfs_fhget(dentry, &fhandle, &fattr);
if (inode) {
no_entry:
d_add(dentry, inode);
nfs_renew_times(dentry);
error = 0;
}
}
out:
return ERR_PTR(error);
}
/*
* Code common to create, mkdir, and mknod.
*/
static int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
struct inode *inode;
int error = -EACCES;
inode = nfs_fhget(dentry, fhandle, fattr);
if (inode) {
d_instantiate(dentry, inode);
nfs_renew_times(dentry);
error = 0;
}
return error;
}
/*
* Following a failed create operation, we drop the dentry rather
* than retain a negative dentry. This avoids a problem in the event
* that the operation succeeded on the server, but an error in the
* reply path made it appear to have failed.
*/
static int nfs_create(struct inode *dir_i, struct dentry *dentry, int mode)
{
struct dentry *dir = dentry->d_parent;
struct iattr attr;
struct nfs_fattr fattr, dir_attr;
struct nfs_fh fhandle;
int error;
dfprintk(VFS, "NFS: create(%x/%ld, %s\n",
dir_i->i_dev, dir_i->i_ino, dentry->d_name.name);
#ifdef NFSD_BROKEN_UID
/* We set uid/gid in the request because IBM's broken nfsd
* uses the root uid/gid otherwise. Argh!
* (Hopefully the server will override the gid when the directory
* has the sticky bit set. Irix may have a problem here...)
*/
attr.ia_mode = mode;
attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID;
attr.ia_uid = current->fsuid;
attr.ia_gid = current->fsgid;
#else
attr.ia_mode = mode;
attr.ia_valid = ATTR_MODE;
#endif
/*
* Invalidate the dir cache before the operation to avoid a race.
* The 0 argument passed into the create function should one day
* contain the O_EXCL flag if requested. This allows NFSv3 to
* select the appropriate create strategy. Currently open_namei
* does not pass the create flags.
*/
nfs_zap_caches(dir_i);
error = NFS_CALL(create, dir_i, (dir, &dir_attr, &dentry->d_name,
&attr, 0, &fhandle, &fattr));
nfs_refresh_inode(dir_i, &dir_attr);
if (!error && fhandle.size != 0)
error = nfs_instantiate(dentry, &fhandle, &fattr);
if (error || fhandle.size == 0)
d_drop(dentry);
return error;
}
/*
* See comments for nfs_proc_create regarding failed operations.
*/
static int nfs_mknod(struct inode *dir_i, struct dentry *dentry, int mode, int rdev)
{
struct dentry *dir = dentry->d_parent;
struct iattr attr;
struct nfs_fattr fattr, dir_attr;
struct nfs_fh fhandle;
int error;
dfprintk(VFS, "NFS: mknod(%x/%ld, %s\n",
dir_i->i_dev, dir_i->i_ino, dentry->d_name.name);
#ifdef NFSD_BROKEN_UID
attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID;
attr.ia_mode = mode;
attr.ia_uid = current->fsuid;
attr.ia_gid = current->fsgid;
#else
attr.ia_valid = ATTR_MODE;
attr.ia_mode = mode;
#endif
nfs_zap_caches(dir_i);
error = NFS_CALL(mknod, dir_i, (dir, &dir_attr, &dentry->d_name,
&attr, rdev, &fhandle, &fattr));
nfs_refresh_inode(dir_i, &dir_attr);
if (!error && fhandle.size != 0)
error = nfs_instantiate(dentry, &fhandle, &fattr);
if (error || fhandle.size == 0)
d_drop(dentry);
return error;
}
/*
* See comments for nfs_proc_create regarding failed operations.
*/
static int nfs_mkdir(struct inode *dir_i, struct dentry *dentry, int mode)
{
struct dentry *dir = dentry->d_parent;
struct iattr attr;
struct nfs_fattr fattr, dir_attr;
struct nfs_fh fhandle;
int error;
dfprintk(VFS, "NFS: mkdir(%x/%ld, %s)\n",
dir_i->i_dev, dir_i->i_ino, dentry->d_name.name);
#ifdef NFSD_BROKEN_UID
attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID;
attr.ia_mode = mode | S_IFDIR;
attr.ia_uid = current->fsuid;
attr.ia_gid = current->fsgid;
#else
attr.ia_valid = ATTR_MODE;
attr.ia_mode = mode | S_IFDIR;
#endif
nfs_zap_caches(dir_i);
error = NFS_CALL(mkdir, dir_i, (dir, &dir_attr,
&dentry->d_name, &attr, &fhandle, &fattr));
nfs_refresh_inode(dir_i, &dir_attr);
if (!error && fhandle.size != 0)
error = nfs_instantiate(dentry, &fhandle, &fattr);
if (error || fhandle.size == 0)
d_drop(dentry);
return error;
}
static int nfs_rmdir(struct inode *dir_i, struct dentry *dentry)
{
struct dentry *dir = dentry->d_parent;
struct nfs_fattr dir_attr;
int error;
dfprintk(VFS, "NFS: rmdir(%x/%ld, %s\n",
dir_i->i_dev, dir_i->i_ino, dentry->d_name.name);
nfs_zap_caches(dir_i);
error = NFS_CALL(rmdir, dir_i, (dir, &dir_attr, &dentry->d_name));
nfs_refresh_inode(dir_i, &dir_attr);
/* Free the inode */
if (!error)
d_delete(dentry);
return error;
}
/* Note: we copy the code from lookup_dentry() here, only: we have to
* omit the directory lock. We are already the owner of the lock when
* we reach here. And "down(&dir->i_sem)" would make us sleep forever
* ('cause WE have the lock)
*
* VERY IMPORTANT: calculate the hash for this dentry!!!!!!!!
* Otherwise the cached lookup DEFINITELY WILL fail. And a new dentry
* is created. Without the DCACHE_NFSFS_RENAMED flag. And with d_count
* == 1. And trouble.
*
* Concerning my choice of the temp name: it is just nice to have
* i_ino part of the temp name, as this offers another check whether
* somebody attempts to remove the "silly renamed" dentry itself.
* Which is something that I consider evil. Your opinion may vary.
* BUT:
* Now that I compute the hash value right, it should be possible to simply
* check for the DCACHE_NFSFS_RENAMED flag in dentry->d_flag instead of
* doing the string compare.
* WHICH MEANS:
* This offers the opportunity to shorten the temp name. Currently, I use
* the hex representation of i_ino + an event counter. This sums up to
* as much as 36 characters for a 64 bit machine, and needs 20 chars on
* a 32 bit machine.
* QUINTESSENCE
* The use of i_ino is simply cosmetic. All we need is a unique temp
* file name for the .nfs files. The event counter seemed to be adequate.
* And as we retry in case such a file already exists, we are guaranteed
* to succeed.
*/
static
struct dentry *nfs_silly_lookup(struct dentry *parent, char *silly, int slen)
{
struct qstr sqstr;
struct dentry *sdentry;
struct dentry *res;
sqstr.name = silly;
sqstr.len = slen;
sqstr.hash = full_name_hash(silly, slen);
sdentry = d_lookup(parent, &sqstr);
if (!sdentry) {
sdentry = d_alloc(parent, &sqstr);
if (sdentry == NULL)
return ERR_PTR(-ENOMEM);
res = nfs_lookup(parent->d_inode, sdentry);
if (res) {
dput(sdentry);
return res;
}
}
return sdentry;
}
static int nfs_sillyrename(struct inode *dir_i, struct dentry *dentry)
{
struct dentry *dir = dentry->d_parent;
static unsigned int sillycounter = 0;
struct nfs_fattr dir_attr;
const int i_inosize = sizeof(dir_i->i_ino)*2;
const int countersize = sizeof(sillycounter)*2;
const int slen = strlen(".nfs") + i_inosize + countersize;
struct qstr qsilly;
char silly[slen+1];
struct dentry * sdentry;
int error = -EIO;
dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
dentry->d_count);
/*
* Note that a silly-renamed file can be deleted once it's
* no longer in use -- it's just an ordinary file now.
*/
if (dentry->d_count == 1)
goto out; /* No need to silly rename. */
#ifdef NFS_PARANOIA
if (!dentry->d_inode)
printk(KERN_ERR "NFS: silly-renaming %s/%s, negative dentry??\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
/*
* We don't allow a dentry to be silly-renamed twice.
*/
error = -EBUSY;
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
goto out;
sprintf(silly, ".nfs%*.*lx",
i_inosize, i_inosize, dentry->d_inode->i_ino);
sdentry = NULL;
do {
char *suffix = silly + slen - countersize;
if (sdentry)
dput(sdentry);
sillycounter++;
sprintf(suffix, "%*.*x", countersize, countersize, sillycounter);
dfprintk(VFS, "trying to rename %s to %s\n",
dentry->d_name.name, silly);
sdentry = nfs_silly_lookup(dentry->d_parent, silly, slen);
/*
* N.B. Better to return EBUSY here ... it could be
* dangerous to delete the file while it's in use.
*/
if (IS_ERR(sdentry))
goto out;
} while(sdentry->d_inode != NULL); /* need negative lookup */
nfs_zap_caches(dir_i);
qsilly.name = silly;
qsilly.len = strlen(silly);
error = NFS_CALL(rename, dir_i, (dir, &dir_attr, &dentry->d_name,
dir, &dir_attr, &qsilly));
nfs_refresh_inode(dir_i, &dir_attr);
if (!error) {
nfs_renew_times(dentry);
d_move(dentry, sdentry);
error = nfs_async_unlink(dentry);
/* If we return 0 we don't unlink */
}
dput(sdentry);
out:
return error;
}
/*
* Remove a file after making sure there are no pending writes,
* and after checking that the file has only one user.
*
* We update inode->i_nlink and free the inode prior to the operation
* to avoid possible races if the server reuses the inode.
*/
static int nfs_safe_remove(struct dentry *dentry)
{
struct nfs_fattr dir_attr;
struct dentry *dir = dentry->d_parent;
struct inode *dir_i = dir->d_inode,
*inode = dentry->d_inode;
int error = 0, rehash = 0;
/*
* Unhash the dentry while we remove the file ...
*/
if (!list_empty(&dentry->d_hash)) {
d_drop(dentry);
rehash = 1;
}
/* If the dentry was sillyrenamed, we simply call d_delete() */
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
goto out_delete;
dfprintk(VFS, "NFS: safe_remove(%s/%s)\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
/* N.B. not needed now that d_delete is done in advance? */
error = -EBUSY;
if (!inode) {
#ifdef NFS_PARANOIA
printk(KERN_ERR "nfs_safe_remove: %s/%s already negative??\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
}
if (dentry->d_count > 1) {
#ifdef NFS_PARANOIA
printk(KERN_INFO "nfs_safe_remove: %s/%s busy, d_count=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, dentry->d_count);
#endif
goto out;
}
nfs_zap_caches(dir_i);
if (inode)
NFS_CACHEINV(inode);
error = NFS_CALL(remove, dir_i, (dir, &dir_attr, &dentry->d_name));
nfs_refresh_inode(dir_i, &dir_attr);
if (error < 0)
goto out;
out_delete:
/*
* Free the inode
*/
d_delete(dentry);
out:
/*
* Rehash the negative dentry if the operation succeeded.
*/
if (rehash)
d_rehash(dentry);
return error;
}
/* We do silly rename. In case sillyrename() returns -EBUSY, the inode
* belongs to an active ".nfs..." file and we return -EBUSY.
*
* If sillyrename() returns 0, we do nothing, otherwise we unlink.
*/
static int nfs_unlink(struct inode *dir, struct dentry *dentry)
{
int error;
dfprintk(VFS, "NFS: unlink(%x/%ld, %s)\n",
dir->i_dev, dir->i_ino, dentry->d_name.name);
if (dentry->d_inode)
nfs_wb_all(dentry->d_inode);
error = nfs_sillyrename(dir, dentry);
if (error && error != -EBUSY) {
error = nfs_safe_remove(dentry);
if (!error) {
nfs_renew_times(dentry);
}
}
return error;
}
static int
nfs_symlink(struct inode *dir_i, struct dentry *dentry, const char *symname)
{
struct dentry *dir = dentry->d_parent;
struct nfs_fattr dir_attr, sym_attr;
struct nfs_fh sym_fh;
struct iattr attr;
struct qstr qsymname;
int error, mode, maxlen;
dfprintk(VFS, "NFS: symlink(%x/%ld, %s, %s)\n",
dir_i->i_dev, dir_i->i_ino, dentry->d_name.name, symname);
error = -ENAMETOOLONG;
maxlen = (NFS_PROTO(dir_i)->version==2) ? NFS2_MAXPATHLEN : NFS3_MAXPATHLEN;
if (strlen(symname) > maxlen)
goto out;
#ifdef NFS_PARANOIA
if (dentry->d_inode)
printk(KERN_WARNING "nfs_proc_symlink: %s/%s not negative!\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
/*
* Fill in the sattr for the call.
* Note: SunOS 4.1.2 crashes if the mode isn't initialized!
*/
#ifdef NFSD_BROKEN_UID
attr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID;
attr.ia_mode = mode = S_IFLNK | S_IRWXUGO;
attr.ia_uid = current->fsuid;
attr.ia_gid = current->fsgid;
#else
attr.ia_valid = ATTR_MODE;
attr.ia_mode = mode = S_IFLNK | S_IRWXUGO;
#endif
qsymname.name = symname;
qsymname.len = strlen(symname);
nfs_zap_caches(dir_i);
error = NFS_CALL(symlink, dir_i, (dir, &dir_attr,
&dentry->d_name, &qsymname, &attr,
&sym_fh, &sym_attr));
nfs_refresh_inode(dir_i, &dir_attr);
if (!error && sym_fh.size != 0 && (sym_attr.valid & NFS_ATTR_FATTR)) {
error = nfs_instantiate(dentry, &sym_fh, &sym_attr);
} else {
if (error == -EEXIST)
printk(KERN_INFO "nfs_proc_symlink: %s/%s already exists??\n",
dentry->d_parent->d_name.name,
dentry->d_name.name);
d_drop(dentry);
}
out:
return error;
}
static int
nfs_link(struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
{
struct dentry *dir = dentry->d_parent;
struct inode *inode = old_dentry->d_inode;
struct nfs_fattr old_attr, dir_attr;
int error;
dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n",
old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
dentry->d_parent->d_name.name, dentry->d_name.name);
/*
* Drop the dentry in advance to force a new lookup.
* Since nfs_proc_link doesn't return a file handle,
* we can't use the existing dentry.
*/
d_drop(dentry);
nfs_zap_caches(dir_i);
NFS_CACHEINV(inode);
error = NFS_CALL(link, inode, (old_dentry, &old_attr,
dir, &dir_attr, &dentry->d_name));
nfs_refresh_inode(inode, &old_attr);
nfs_refresh_inode(dir_i, &dir_attr);
return error;
}
/*
* RENAME
* FIXME: Some nfsds, like the Linux user space nfsd, may generate a
* different file handle for the same inode after a rename (e.g. when
* moving to a different directory). A fail-safe method to do so would
* be to look up old_dir/old_name, create a link to new_dir/new_name and
* rename the old file using the sillyrename stuff. This way, the original
* file in old_dir will go away when the last process iput()s the inode.
*
* FIXED.
*
* It actually works quite well. One needs to have the possibility for
* at least one ".nfs..." file in each directory the file ever gets
* moved or linked to which happens automagically with the new
* implementation that only depends on the dcache stuff instead of
* using the inode layer
*
* Unfortunately, things are a little more complicated than indicated
* above. For a cross-directory move, we want to make sure we can get
* rid of the old inode after the operation. This means there must be
* no pending writes (if it's a file), and the use count must be 1.
* If these conditions are met, we can drop the dentries before doing
* the rename.
*
* FIXME: Sun seems to take this even one step further. The connectathon
* test suite has a file that renames open file A to open file B,
* and expects a silly rename to happen for B.
*/
static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct nfs_fattr old_attr, new_attr;
struct inode * old_inode = old_dentry->d_inode;
struct inode * new_inode = new_dentry->d_inode;
struct dentry * dentry = NULL, *rehash = NULL;
int error;
/*
* To prevent any new references to the target during the rename,
* we unhash the dentry and free the inode in advance.
*/
if (!list_empty(&new_dentry->d_hash)) {
d_drop(new_dentry);
rehash = new_dentry;
}
dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n",
old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
new_dentry->d_parent->d_name.name, new_dentry->d_name.name,
new_dentry->d_count);
/*
* First check whether the target is busy ... we can't
* safely do _any_ rename if the target is in use.
*
* For files, make a copy of the dentry and then do a
* silly-rename. If the silly-rename succeeds, the
* copied dentry is hashed and becomes the new target.
*
* With directories check is done in VFS.
*/
error = -EBUSY;
if (new_inode)
nfs_wb_all(new_inode);
if (new_dentry->d_count > 1 && new_inode) {
int err;
/* copy the target dentry's name */
dentry = d_alloc(new_dentry->d_parent,
&new_dentry->d_name);
if (!dentry)
goto out;
/* silly-rename the existing target ... */
err = nfs_sillyrename(new_dir, new_dentry);
if (!err) {
new_dentry = rehash = dentry;
new_inode = NULL;
/* hash the replacement target */
d_instantiate(new_dentry, NULL);
}
/* dentry still busy? */
if (new_dentry->d_count > 1) {
#ifdef NFS_PARANOIA
printk(KERN_INFO "nfs_rename: target %s/%s busy, d_count=%d\n",
new_dentry->d_parent->d_name.name,
new_dentry->d_name.name,new_dentry->d_count);
#endif
goto out;
}
}
/*
* ... prune child dentries and writebacks if needed.
*/
if (old_dentry->d_count > 1) {
nfs_wb_all(old_inode);
shrink_dcache_parent(old_dentry);
}
if (new_dentry->d_count > 1 && new_inode) {
#ifdef NFS_PARANOIA
printk(KERN_INFO "nfs_rename: new dentry %s/%s busy, d_count=%d\n",
new_dentry->d_parent->d_name.name,new_dentry->d_name.name,new_dentry->d_count);
#endif
goto out;
}
if (new_inode)
d_delete(new_dentry);
nfs_zap_caches(new_dir);
nfs_zap_caches(old_dir);
error = NFS_CALL(rename, old_dir,
(old_dentry->d_parent, &old_attr, &old_dentry->d_name,
new_dentry->d_parent, &new_attr, &new_dentry->d_name));
nfs_refresh_inode(old_dir, &old_attr);
nfs_refresh_inode(new_dir, &new_attr);
out:
/* Update the dcache if needed */
if (rehash)
d_rehash(rehash);
if (!error && !S_ISDIR(old_inode->i_mode))
d_move(old_dentry, new_dentry);
/* new dentry created? */
if (dentry)
dput(dentry);
return error;
}
int
nfs_permission(struct inode *i, int msk)
{
struct nfs_fattr fattr;
struct dentry *de = NULL;
int err = vfs_permission(i, msk);
struct list_head *start, *tmp;
if (!NFS_PROTO(i)->access)
goto out;
/*
* Trust UNIX mode bits except:
*
* 1) When override capabilities may have been invoked
* 2) When root squashing may be involved
* 3) When ACLs may overturn a negative answer */
if (!capable(CAP_DAC_OVERRIDE) && !capable(CAP_DAC_READ_SEARCH)
&& (current->fsuid != 0) && (current->fsgid != 0)
&& err != -EACCES)
goto out;
tmp = start = &i->i_dentry;
while ((tmp = tmp->next) != start) {
de = list_entry(tmp, struct dentry, d_alias);
if (de->d_inode == i)
break;
}
if (!de || de->d_inode != i)
return 0;
err = NFS_CALL(access, i, (de, msk, &fattr, 0));
if (err == -EACCES && NFS_CLIENT(i)->cl_droppriv &&
current->uid != 0 && current->gid != 0 &&
(current->fsuid != current->uid || current->fsgid != current->gid))
err = NFS_CALL(access, i, (de, msk, &fattr, 1));
nfs_refresh_inode(i, &fattr);
out:
return err;
}
/*
* Local variables:
* version-control: t
* kept-new-versions: 5
* End:
*/
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