#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
-#include <linux/smp_lock.h>
-#include "vnode.h"
-#include "volume.h"
-#include <rxrpc/call.h>
-#include "super.h"
#include "internal.h"
static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
if (qty == 0)
goto error;
- if (page->index==0 && qty!=ntohs(dbuf->blocks[0].pagehdr.npages)) {
+ if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
- __FUNCTION__,dir->i_ino,qty,ntohs(dbuf->blocks[0].pagehdr.npages));
+ __FUNCTION__, dir->i_ino, qty,
+ ntohs(dbuf->blocks[0].pagehdr.npages));
goto error;
}
#endif
fail:
afs_dir_put_page(page);
+ _leave(" = -EIO");
return ERR_PTR(-EIO);
}
BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
- if (AFS_FS_I(inode)->flags & AFS_VNODE_DELETED)
+ if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
return -ENOENT;
_leave(" = 0");
/* skip entries marked unused in the bitmap */
if (!(block->pagehdr.bitmap[offset / 8] &
(1 << (offset % 8)))) {
- _debug("ENT[%Zu.%u]: unused\n",
+ _debug("ENT[%Zu.%u]: unused",
blkoff / sizeof(union afs_dir_block), offset);
if (offset >= curr)
*fpos = blkoff +
sizeof(*block) -
offset * sizeof(union afs_dirent));
- _debug("ENT[%Zu.%u]: %s %Zu \"%s\"\n",
+ _debug("ENT[%Zu.%u]: %s %Zu \"%s\"",
blkoff / sizeof(union afs_dir_block), offset,
(offset < curr ? "skip" : "fill"),
nlen, dire->u.name);
if (next >= AFS_DIRENT_PER_BLOCK) {
_debug("ENT[%Zu.%u]:"
" %u travelled beyond end dir block"
- " (len %u/%Zu)\n",
+ " (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)\n",
+ " %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\n",
+ _debug("ENT[%Zu.%u]: ext %u/%Zu",
blkoff / sizeof(union afs_dir_block),
next, tmp, nlen);
next++;
}
/*
- * read an AFS directory
+ * iterate through the data blob that lists the contents of an AFS directory
*/
static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie,
filldir_t filldir)
{
- union afs_dir_block *dblock;
+ union afs_dir_block *dblock;
struct afs_dir_page *dbuf;
struct page *page;
unsigned blkoff, limit;
_enter("{%lu},%u,,", dir->i_ino, *fpos);
- if (AFS_FS_I(dir)->flags & AFS_VNODE_DELETED) {
+ if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
_leave(" = -ESTALE");
return -ESTALE;
}
unsigned fpos;
int ret;
- _enter("{%Ld,{%lu}}", file->f_pos, file->f_path.dentry->d_inode->i_ino);
+ _enter("{%Ld,{%lu}}",
+ file->f_pos, file->f_path.dentry->d_inode->i_ino);
fpos = file->f_pos;
- ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, cookie, filldir);
+ ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos,
+ cookie, filldir);
file->f_pos = fpos;
_leave(" = %d", ret);
{
struct afs_dir_lookup_cookie *cookie = _cookie;
- _enter("{%s,%Zu},%s,%u,,%lu,%u",
+ _enter("{%s,%Zu},%s,%u,,%llu,%u",
cookie->name, cookie->nlen, name, nlen, ino, dtype);
+ /* insanity checks first */
+ BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
+ BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
+
if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) {
_leave(" = 0 [no]");
return 0;
}
/*
- * look up an entry in a directory
+ * do a lookup in a directory
*/
-static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *nd)
+static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
+ struct afs_fid *fid)
{
struct afs_dir_lookup_cookie cookie;
struct afs_super_info *as;
- struct afs_vnode *vnode;
- struct inode *inode;
unsigned fpos;
int ret;
- _enter("{%lu},%p{%s}", dir->i_ino, dentry, dentry->d_name.name);
-
- /* insanity checks first */
- BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
- BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
-
- if (dentry->d_name.len > 255) {
- _leave(" = -ENAMETOOLONG");
- return ERR_PTR(-ENAMETOOLONG);
- }
-
- vnode = AFS_FS_I(dir);
- if (vnode->flags & AFS_VNODE_DELETED) {
- _leave(" = -ESTALE");
- return ERR_PTR(-ESTALE);
- }
+ _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name);
as = dir->i_sb->s_fs_info;
fpos = 0;
ret = afs_dir_iterate(dir, &fpos, &cookie, afs_dir_lookup_filldir);
if (ret < 0) {
- _leave(" = %d", ret);
- return ERR_PTR(ret);
+ _leave(" = %d [iter]", ret);
+ return ret;
}
ret = -ENOENT;
if (!cookie.found) {
- _leave(" = %d", ret);
- return ERR_PTR(ret);
+ _leave(" = -ENOENT [not found]");
+ return -ENOENT;
}
- /* instantiate the dentry */
- ret = afs_iget(dir->i_sb, &cookie.fid, &inode);
+ *fid = cookie.fid;
+ _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
+ return 0;
+}
+
+/*
+ * look up an entry in a directory
+ */
+static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct afs_vnode *vnode;
+ struct afs_fid fid;
+ struct inode *inode;
+ int ret;
+
+ _enter("{%lu},%p{%s}", dir->i_ino, dentry, dentry->d_name.name);
+
+ if (dentry->d_name.len > 255) {
+ _leave(" = -ENAMETOOLONG");
+ return ERR_PTR(-ENAMETOOLONG);
+ }
+
+ vnode = AFS_FS_I(dir);
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+ _leave(" = -ESTALE");
+ return ERR_PTR(-ESTALE);
+ }
+
+ ret = afs_do_lookup(dir, dentry, &fid);
if (ret < 0) {
- _leave(" = %d", ret);
+ _leave(" = %d [do]", ret);
return ERR_PTR(ret);
}
+ /* instantiate the dentry */
+ inode = afs_iget(dir->i_sb, &fid);
+ if (IS_ERR(inode)) {
+ _leave(" = %ld", PTR_ERR(inode));
+ return ERR_PTR(PTR_ERR(inode));
+ }
+
dentry->d_op = &afs_fs_dentry_operations;
- dentry->d_fsdata = (void *) (unsigned long) vnode->status.version;
d_add(dentry, inode);
_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }",
- cookie.fid.vnode,
- cookie.fid.unique,
+ fid.vnode,
+ fid.unique,
dentry->d_inode->i_ino,
dentry->d_inode->i_version);
return NULL;
}
+/*
+ * propagate changed and modified flags on a directory to all the children of
+ * that directory as they may indicate that the ACL on the dir has changed,
+ * potentially rendering the child inaccessible or that a file has been deleted
+ * or renamed
+ */
+static void afs_propagate_dir_changes(struct dentry *dir)
+{
+ struct dentry *child;
+ bool c, m;
+
+ c = test_bit(AFS_VNODE_CHANGED, &AFS_FS_I(dir->d_inode)->flags);
+ m = test_bit(AFS_VNODE_MODIFIED, &AFS_FS_I(dir->d_inode)->flags);
+
+ _enter("{%d,%d}", c, m);
+
+ spin_lock(&dir->d_lock);
+
+ list_for_each_entry(child, &dir->d_subdirs, d_u.d_child) {
+ if (child->d_inode) {
+ struct afs_vnode *vnode;
+
+ _debug("tag %s", child->d_name.name);
+ vnode = AFS_FS_I(child->d_inode);
+ if (c)
+ set_bit(AFS_VNODE_DIR_CHANGED, &vnode->flags);
+ if (m)
+ set_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags);
+ }
+ }
+
+ spin_unlock(&dir->d_lock);
+}
+
/*
* 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
- * (derived from nfs_lookup_revalidate)
+ * - there are several things we need to check
+ * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
+ * symlink)
+ * - parent dir metadata changed (security changes)
+ * - dentry data changed (write, truncate)
+ * - dentry metadata changed (security changes)
*/
static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
- struct afs_dir_lookup_cookie cookie;
+ struct afs_vnode *vnode;
+ struct afs_fid fid;
struct dentry *parent;
struct inode *inode, *dir;
- unsigned fpos;
int ret;
- _enter("{sb=%p n=%s},", dentry->d_sb, dentry->d_name.name);
+ vnode = AFS_FS_I(dentry->d_inode);
+
+ _enter("{sb=%p n=%s fl=%lx},",
+ dentry->d_sb, dentry->d_name.name, vnode->flags);
/* lock down the parent dentry so we can peer at it */
- parent = dget_parent(dentry->d_parent);
+ parent = dget_parent(dentry);
dir = parent->d_inode;
inode = dentry->d_inode;
/* handle a bad inode */
if (is_bad_inode(inode)) {
printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
- dentry->d_parent->d_name.name, dentry->d_name.name);
+ parent->d_name.name, dentry->d_name.name);
goto out_bad;
}
- /* force a full look up if the parent directory changed since last the
- * server was consulted
- * - otherwise this inode must still exist, even if the inode details
- * themselves have changed
- */
- if (AFS_FS_I(dir)->flags & AFS_VNODE_CHANGED)
- afs_vnode_fetch_status(AFS_FS_I(dir));
-
- if (AFS_FS_I(dir)->flags & AFS_VNODE_DELETED) {
+ /* check that this dirent still exists if the directory's contents were
+ * modified */
+ if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
_debug("%s: parent dir deleted", dentry->d_name.name);
goto out_bad;
}
- if (AFS_FS_I(inode)->flags & AFS_VNODE_DELETED) {
- _debug("%s: file already deleted", dentry->d_name.name);
- goto out_bad;
- }
-
- if ((unsigned long) dentry->d_fsdata !=
- (unsigned long) AFS_FS_I(dir)->status.version) {
- _debug("%s: parent changed %lu -> %u",
- dentry->d_name.name,
- (unsigned long) dentry->d_fsdata,
- (unsigned) AFS_FS_I(dir)->status.version);
+ if (test_and_clear_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags)) {
+ /* rm/rmdir/rename may have occurred */
+ _debug("dir modified");
/* search the directory for this vnode */
- cookie.name = dentry->d_name.name;
- cookie.nlen = dentry->d_name.len;
- cookie.fid.vid = AFS_FS_I(inode)->volume->vid;
- cookie.found = 0;
-
- fpos = 0;
- ret = afs_dir_iterate(dir, &fpos, &cookie,
- afs_dir_lookup_filldir);
+ ret = afs_do_lookup(dir, dentry, &fid);
+ if (ret == -ENOENT) {
+ _debug("%s: dirent not found", dentry->d_name.name);
+ goto not_found;
+ }
if (ret < 0) {
_debug("failed to iterate dir %s: %d",
parent->d_name.name, ret);
goto out_bad;
}
- if (!cookie.found) {
- _debug("%s: dirent not found", dentry->d_name.name);
- goto not_found;
- }
-
/* if the vnode ID has changed, then the dirent points to a
* different file */
- if (cookie.fid.vnode != AFS_FS_I(inode)->fid.vnode) {
- _debug("%s: dirent changed", dentry->d_name.name);
+ if (fid.vnode != vnode->fid.vnode) {
+ _debug("%s: dirent changed [%u != %u]",
+ dentry->d_name.name, fid.vnode,
+ vnode->fid.vnode);
goto not_found;
}
/* if the vnode ID uniqifier has changed, then the file has
* been deleted */
- if (cookie.fid.unique != AFS_FS_I(inode)->fid.unique) {
+ if (fid.unique != vnode->fid.unique) {
_debug("%s: file deleted (uq %u -> %u I:%lu)",
- dentry->d_name.name,
- cookie.fid.unique,
- AFS_FS_I(inode)->fid.unique,
- inode->i_version);
- spin_lock(&AFS_FS_I(inode)->lock);
- AFS_FS_I(inode)->flags |= AFS_VNODE_DELETED;
- spin_unlock(&AFS_FS_I(inode)->lock);
+ dentry->d_name.name, fid.unique,
+ vnode->fid.unique, inode->i_version);
+ spin_lock(&vnode->lock);
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ spin_unlock(&vnode->lock);
invalidate_remote_inode(inode);
goto out_bad;
}
+ }
+
+ /* if the directory's metadata were changed then the security may be
+ * different and we may no longer have access */
+ mutex_lock(&vnode->cb_broken_lock);
- dentry->d_fsdata =
- (void *) (unsigned long) AFS_FS_I(dir)->status.version;
+ if (test_and_clear_bit(AFS_VNODE_DIR_CHANGED, &vnode->flags) ||
+ test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
+ _debug("%s: changed", dentry->d_name.name);
+ set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+ if (afs_vnode_fetch_status(vnode) < 0) {
+ mutex_unlock(&vnode->cb_broken_lock);
+ goto out_bad;
+ }
}
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+ _debug("%s: file already deleted", dentry->d_name.name);
+ mutex_unlock(&vnode->cb_broken_lock);
+ goto out_bad;
+ }
+
+ /* if the vnode's data version number changed then its contents are
+ * different */
+ if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
+ _debug("zap data");
+ invalidate_remote_inode(inode);
+ }
+
+ if (S_ISDIR(inode->i_mode) &&
+ (test_bit(AFS_VNODE_CHANGED, &vnode->flags) ||
+ test_bit(AFS_VNODE_MODIFIED, &vnode->flags)))
+ afs_propagate_dir_changes(dentry);
+
+ clear_bit(AFS_VNODE_CHANGED, &vnode->flags);
+ clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
+ mutex_unlock(&vnode->cb_broken_lock);
+
out_valid:
dput(parent);
_leave(" = 1 [valid]");
goto out_valid;
}
- shrink_dcache_parent(dentry);
-
_debug("dropping dentry %s/%s",
- dentry->d_parent->d_name.name, dentry->d_name.name);
+ parent->d_name.name, dentry->d_name.name);
+ shrink_dcache_parent(dentry);
d_drop(dentry);
-
dput(parent);
_leave(" = 0 [bad]");
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
goto zap;
- if (dentry->d_inode) {
- if (AFS_FS_I(dentry->d_inode)->flags & AFS_VNODE_DELETED)
+ if (dentry->d_inode &&
+ test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags))
goto zap;
- }
_leave(" = 0 [keep]");
return 0;
projects / firefly-linux-kernel-4.4.55.git / blobdiff