Added a "reenter" parameter to the {read|write}_pages() functions to give file
systems a chance to know if they have locked already. This fixes a locking problem in BFS where one thread tried to acquire two read locks (where someone else trying to acquire a write lock would have caused a dead lock). git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17108 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
parent
4d89d3e7e1
commit
97e069713b
@ -1,6 +1,6 @@
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/* File System Interface Layer Definition
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*
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* Copyright 2004-2005, Haiku Inc. All Rights Reserved.
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* Copyright 2004-2006, Haiku Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _FS_INTERFACE_H
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@ -87,8 +87,10 @@ typedef struct file_system_module_info {
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/* VM file access */
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bool (*can_page)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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status_t (*read_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes);
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status_t (*write_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes);
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status_t (*read_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter);
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status_t (*write_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter);
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/* cache file access */
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status_t (*get_file_map)(fs_volume fs, fs_vnode vnode, off_t offset, size_t size, struct file_io_vec *vecs, size_t *_count);
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@ -87,9 +87,9 @@ void vfs_acquire_vnode(void *vnode);
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status_t vfs_get_cookie_from_fd(int fd, void **_cookie);
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bool vfs_can_page(void *vnode, void *cookie);
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status_t vfs_read_pages(void *vnode, void *cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes);
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const iovec *vecs, size_t count, size_t *_numBytes, bool fsReenter);
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status_t vfs_write_pages(void *vnode, void *cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes);
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const iovec *vecs, size_t count, size_t *_numBytes, bool fsReenter);
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status_t vfs_get_vnode_cache(void *vnode, struct vm_cache_ref **_cache, bool allocate);
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status_t vfs_get_file_map( void *_vnode, off_t offset, size_t size,
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struct file_io_vec *vecs, size_t *_count);
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@ -27,7 +27,7 @@ void vm_cache_release_ref(vm_cache_ref *cache_ref);
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vm_page *vm_cache_lookup_page(vm_cache_ref *cacheRef, off_t page);
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void vm_cache_insert_page(vm_cache_ref *cacheRef, vm_page *page, off_t offset);
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void vm_cache_remove_page(vm_cache_ref *cacheRef, vm_page *page);
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status_t vm_cache_write_modified(vm_cache_ref *ref);
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status_t vm_cache_write_modified(vm_cache_ref *ref, bool fsReenter);
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status_t vm_cache_set_minimal_commitment(vm_cache_ref *ref, off_t commitment);
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status_t vm_cache_resize(vm_cache_ref *cacheRef, off_t newSize);
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status_t vm_cache_insert_area(vm_cache_ref *cacheRef, vm_area *area);
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@ -34,7 +34,7 @@ status_t vm_page_set_state(vm_page *page, int state);
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size_t vm_page_num_pages(void);
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size_t vm_page_num_free_pages(void);
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status_t vm_page_write_modified(vm_cache *cache);
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status_t vm_page_write_modified(vm_cache *cache, bool fsReenter);
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vm_page *vm_page_allocate_page(int state);
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status_t vm_page_allocate_pages(int pageState, vm_page **pages, uint32 numPages);
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@ -1,5 +1,5 @@
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/*
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* Copyright 2002-2005, Axel Dörfler, axeld@pinc-software.de.
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* Copyright 2002-2006, Axel Dörfler, axeld@pinc-software.de.
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* Distributed under the terms of the MIT License.
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*
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* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
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@ -137,9 +137,12 @@ typedef struct vm_store_ops {
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void (*destroy)(struct vm_store *backing_store);
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status_t (*commit)(struct vm_store *backing_store, off_t size);
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bool (*has_page)(struct vm_store *backing_store, off_t offset);
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status_t (*read)(struct vm_store *backing_store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes);
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status_t (*write)(struct vm_store *backing_store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes);
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status_t (*fault)(struct vm_store *backing_store, struct vm_address_space *aspace, off_t offset);
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status_t (*read)(struct vm_store *backing_store, off_t offset, const iovec *vecs,
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size_t count, size_t *_numBytes, bool fsReenter);
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status_t (*write)(struct vm_store *backing_store, off_t offset, const iovec *vecs,
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size_t count, size_t *_numBytes, bool fsReenter);
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status_t (*fault)(struct vm_store *backing_store, struct vm_address_space *aspace,
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off_t offset);
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void (*acquire_ref)(struct vm_store *backing_store);
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void (*release_ref)(struct vm_store *backing_store);
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} vm_store_ops;
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@ -369,53 +369,45 @@ bfs_can_page(fs_volume _fs, fs_vnode _v, fs_cookie _cookie)
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static status_t
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bfs_read_pages(fs_volume _fs, fs_vnode _node, fs_cookie _cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes)
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
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{
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Inode *inode = (Inode *)_node;
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if (inode->FileCache() == NULL)
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RETURN_ERROR(B_BAD_VALUE);
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ReadLocked locked(inode->Lock());
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return file_cache_read_pages(inode->FileCache(), pos, vecs, count, _numBytes);
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#if 0
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for (uint32 i = 0; i < count; i++) {
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if (pos >= inode->Size()) {
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memset(vecs[i].iov_base, 0, vecs[i].iov_len);
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pos += vecs[i].iov_len;
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*_numBytes -= vecs[i].iov_len;
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} else {
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uint32 length = vecs[i].iov_len;
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if (length > inode->Size() - pos)
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length = inode->Size() - pos;
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if (!reenter)
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inode->Lock().Lock();
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inode->ReadAt(pos, (uint8 *)vecs[i].iov_base, &length);
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status_t status = file_cache_read_pages(inode->FileCache(), pos, vecs, count,
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_numBytes);
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if (length < vecs[i].iov_len) {
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memset((char *)vecs[i].iov_base + length, 0, vecs[i].iov_len - length);
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*_numBytes -= vecs[i].iov_len - length;
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}
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if (!reenter)
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inode->Lock().Unlock();
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pos += vecs[i].iov_len;
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}
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}
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return B_OK;
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#endif
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return status;
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}
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static status_t
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bfs_write_pages(fs_volume _fs, fs_vnode _node, fs_cookie _cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes)
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
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{
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Inode *inode = (Inode *)_node;
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if (inode->FileCache() == NULL)
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RETURN_ERROR(B_BAD_VALUE);
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ReadLocked locked(inode->Lock());
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return file_cache_write_pages(inode->FileCache(), pos, vecs, count, _numBytes);
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if (!reenter)
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inode->Lock().Lock();
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status_t status = file_cache_write_pages(inode->FileCache(), pos, vecs, count,
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_numBytes);
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if (!reenter)
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inode->Lock().Unlock();
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return status;
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}
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16
src/system/kernel/cache/file_cache.cpp
vendored
16
src/system/kernel/cache/file_cache.cpp
vendored
@ -317,7 +317,8 @@ pages_io(file_cache_ref *ref, off_t offset, const iovec *vecs, size_t count,
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if (size > numBytes)
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size = numBytes;
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status = vfs_read_pages(ref->device, ref->cookie, fileVecs[0].offset, vecs, count, &size);
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status = vfs_read_pages(ref->device, ref->cookie, fileVecs[0].offset, vecs,
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count, &size, false);
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if (status < B_OK)
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return status;
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@ -394,10 +395,13 @@ pages_io(file_cache_ref *ref, off_t offset, const iovec *vecs, size_t count,
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}
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size_t bytes = size;
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if (doWrite)
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status = vfs_write_pages(ref->device, ref->cookie, fileVec.offset, tempVecs, tempCount, &bytes);
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else
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status = vfs_read_pages(ref->device, ref->cookie, fileVec.offset, tempVecs, tempCount, &bytes);
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if (doWrite) {
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status = vfs_write_pages(ref->device, ref->cookie, fileVec.offset, tempVecs,
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tempCount, &bytes, false);
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} else {
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status = vfs_read_pages(ref->device, ref->cookie, fileVec.offset, tempVecs,
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tempCount, &bytes, false);
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}
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if (status < B_OK)
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return status;
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@ -1221,7 +1225,7 @@ file_cache_sync(void *_cacheRef)
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if (ref == NULL)
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return B_BAD_VALUE;
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return vm_cache_write_modified(ref->cache);
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return vm_cache_write_modified(ref->cache, true);
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}
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13
src/system/kernel/cache/vnode_store.cpp
vendored
13
src/system/kernel/cache/vnode_store.cpp
vendored
@ -1,5 +1,5 @@
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/*
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* Copyright 2004-2005, Axel Dörfler, axeld@pinc-software.de.
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* Copyright 2004-2006, Axel Dörfler, axeld@pinc-software.de.
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* Distributed under the terms of the MIT License.
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*/
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@ -41,12 +41,14 @@ store_has_page(struct vm_store *_store, off_t offset)
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static status_t
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store_read(struct vm_store *_store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes)
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store_read(struct vm_store *_store, off_t offset, const iovec *vecs, size_t count,
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size_t *_numBytes, bool fsReenter)
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{
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vnode_store *store = (vnode_store *)_store;
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size_t bytesUntouched = *_numBytes;
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status_t status = vfs_read_pages(store->vnode, NULL, offset, vecs, count, _numBytes);
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status_t status = vfs_read_pages(store->vnode, NULL, offset, vecs, count,
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_numBytes, fsReenter);
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bytesUntouched -= *_numBytes;
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@ -70,10 +72,11 @@ store_read(struct vm_store *_store, off_t offset, const iovec *vecs, size_t coun
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static status_t
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store_write(struct vm_store *_store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes)
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store_write(struct vm_store *_store, off_t offset, const iovec *vecs, size_t count,
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size_t *_numBytes, bool fsReenter)
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{
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vnode_store *store = (vnode_store *)_store;
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return vfs_write_pages(store->vnode, NULL, offset, vecs, count, _numBytes);
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return vfs_write_pages(store->vnode, NULL, offset, vecs, count, _numBytes, fsReenter);
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}
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@ -1643,7 +1643,8 @@ devfs_can_page(fs_volume _fs, fs_vnode _vnode, fs_cookie cookie)
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static status_t
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devfs_read_pages(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
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devfs_read_pages(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
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{
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struct devfs_vnode *vnode = (devfs_vnode *)_vnode;
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struct devfs_cookie *cookie = (struct devfs_cookie *)_cookie;
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@ -1663,7 +1664,8 @@ devfs_read_pages(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, off_t pos, c
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static status_t
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devfs_write_pages(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
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devfs_write_pages(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
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{
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struct devfs_vnode *vnode = (devfs_vnode *)_vnode;
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struct devfs_cookie *cookie = (struct devfs_cookie *)_cookie;
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@ -1,5 +1,5 @@
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/*
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* Copyright 2003-2005, Axel Dörfler, axeld@pinc-software.de.
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* Copyright 2003-2006, Axel Dörfler, axeld@pinc-software.de.
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* Distributed under the terms of the MIT License.
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*/
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@ -1571,14 +1571,16 @@ pipefs_can_page(fs_volume _volume, fs_vnode _v, fs_cookie cookie)
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static status_t
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pipefs_read_pages(fs_volume _volume, fs_vnode _v, fs_cookie cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
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pipefs_read_pages(fs_volume _volume, fs_vnode _v, fs_cookie cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
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{
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return EPERM;
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}
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static status_t
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pipefs_write_pages(fs_volume _volume, fs_vnode _v, fs_cookie cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
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pipefs_write_pages(fs_volume _volume, fs_vnode _v, fs_cookie cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
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{
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return EPERM;
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}
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@ -1,5 +1,5 @@
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/*
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* Copyright 2002-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
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* Copyright 2002-2006, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
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@ -769,14 +769,16 @@ rootfs_can_page(fs_volume _fs, fs_vnode _v, fs_cookie cookie)
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static status_t
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rootfs_read_pages(fs_volume _fs, fs_vnode _v, fs_cookie cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
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rootfs_read_pages(fs_volume _fs, fs_vnode _v, fs_cookie cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
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{
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return B_NOT_ALLOWED;
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}
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static status_t
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rootfs_write_pages(fs_volume _fs, fs_vnode _v, fs_cookie cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
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rootfs_write_pages(fs_volume _fs, fs_vnode _v, fs_cookie cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool reenter)
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{
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return B_NOT_ALLOWED;
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}
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@ -3005,24 +3005,28 @@ vfs_can_page(void *_vnode, void *cookie)
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extern "C" status_t
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vfs_read_pages(void *_vnode, void *cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
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vfs_read_pages(void *_vnode, void *cookie, off_t pos, const iovec *vecs, size_t count,
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size_t *_numBytes, bool fsReenter)
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{
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struct vnode *vnode = (struct vnode *)_vnode;
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FUNCTION(("vfs_read_pages: vnode %p, vecs %p, pos %Ld\n", vnode, vecs, pos));
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return FS_CALL(vnode, read_pages)(vnode->mount->cookie, vnode->private_node, cookie, pos, vecs, count, _numBytes);
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return FS_CALL(vnode, read_pages)(vnode->mount->cookie, vnode->private_node,
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cookie, pos, vecs, count, _numBytes, fsReenter);
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}
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extern "C" status_t
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vfs_write_pages(void *_vnode, void *cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
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vfs_write_pages(void *_vnode, void *cookie, off_t pos, const iovec *vecs, size_t count,
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size_t *_numBytes, bool fsReenter)
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{
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struct vnode *vnode = (struct vnode *)_vnode;
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FUNCTION(("vfs_write_pages: vnode %p, vecs %p, pos %Ld\n", vnode, vecs, pos));
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return FS_CALL(vnode, write_pages)(vnode->mount->cookie, vnode->private_node, cookie, pos, vecs, count, _numBytes);
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return FS_CALL(vnode, write_pages)(vnode->mount->cookie, vnode->private_node,
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cookie, pos, vecs, count, _numBytes, fsReenter);
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}
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@ -1382,7 +1382,7 @@ _vm_put_area(vm_area *area, bool aspaceLocked)
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addressSpace = area->address_space;
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// ToDo: do that only for vnode stores
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vm_cache_write_modified(area->cache_ref);
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vm_cache_write_modified(area->cache_ref, false);
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arch_vm_unset_memory_type(area);
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remove_area_from_address_space(addressSpace, area, aspaceLocked);
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@ -2630,7 +2630,8 @@ vm_soft_fault(addr_t originalAddress, bool isWrite, bool isUser)
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addressSpace->translation_map.ops->get_physical_page(page->physical_page_number * B_PAGE_SIZE, (addr_t *)&vec.iov_base, PHYSICAL_PAGE_CAN_WAIT);
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// ToDo: handle errors here
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err = cache_ref->cache->store->ops->read(cache_ref->cache->store, cacheOffset, &vec, 1, &bytesRead);
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err = cache_ref->cache->store->ops->read(cache_ref->cache->store,
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cacheOffset, &vec, 1, &bytesRead, false);
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addressSpace->translation_map.ops->put_physical_page((addr_t)vec.iov_base);
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mutex_lock(&cache_ref->lock);
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|
@ -311,14 +311,14 @@ vm_cache_remove_page(vm_cache_ref *cacheRef, vm_page *page)
|
||||
|
||||
|
||||
status_t
|
||||
vm_cache_write_modified(vm_cache_ref *ref)
|
||||
vm_cache_write_modified(vm_cache_ref *ref, bool fsReenter)
|
||||
{
|
||||
status_t status;
|
||||
|
||||
TRACE(("vm_cache_write_modified(ref = %p)\n", ref));
|
||||
|
||||
mutex_lock(&ref->lock);
|
||||
status = vm_page_write_modified(ref->cache);
|
||||
status = vm_page_write_modified(ref->cache, fsReenter);
|
||||
mutex_unlock(&ref->lock);
|
||||
|
||||
return status;
|
||||
|
@ -134,7 +134,7 @@ move_page_to_queue(page_queue *from_q, page_queue *to_q, vm_page *page)
|
||||
|
||||
|
||||
static status_t
|
||||
write_page(vm_page *page)
|
||||
write_page(vm_page *page, bool fsReenter)
|
||||
{
|
||||
vm_store *store = page->cache->store;
|
||||
size_t length = B_PAGE_SIZE;
|
||||
@ -150,7 +150,7 @@ write_page(vm_page *page)
|
||||
vecs->iov_len = B_PAGE_SIZE;
|
||||
|
||||
status = store->ops->write(store, (off_t)page->cache_offset << PAGE_SHIFT,
|
||||
vecs, 1, &length);
|
||||
vecs, 1, &length, fsReenter);
|
||||
|
||||
vm_put_physical_page((addr_t)vecs[0].iov_base);
|
||||
|
||||
@ -164,7 +164,7 @@ write_page(vm_page *page)
|
||||
|
||||
|
||||
status_t
|
||||
vm_page_write_modified(vm_cache *cache)
|
||||
vm_page_write_modified(vm_cache *cache, bool fsReenter)
|
||||
{
|
||||
vm_page *page = cache->page_list;
|
||||
|
||||
@ -230,7 +230,7 @@ vm_page_write_modified(vm_cache *cache)
|
||||
continue;
|
||||
|
||||
mutex_unlock(&cache->ref->lock);
|
||||
status = write_page(page);
|
||||
status = write_page(page, fsReenter);
|
||||
mutex_lock(&cache->ref->lock);
|
||||
|
||||
if (status == B_OK) {
|
||||
|
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Copyright 2002-2005, Axel Dörfler, axeld@pinc-software.de.
|
||||
* Copyright 2002-2006, Axel Dörfler, axeld@pinc-software.de.
|
||||
* Distributed under the terms of the MIT License.
|
||||
*
|
||||
* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
|
||||
@ -77,7 +77,8 @@ anonymous_has_page(struct vm_store *store, off_t offset)
|
||||
|
||||
|
||||
static status_t
|
||||
anonymous_read(struct vm_store *store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes)
|
||||
anonymous_read(struct vm_store *store, off_t offset, const iovec *vecs, size_t count,
|
||||
size_t *_numBytes, bool fsReenter)
|
||||
{
|
||||
panic("anonymous_store: read called. Invalid!\n");
|
||||
return B_ERROR;
|
||||
@ -85,7 +86,8 @@ anonymous_read(struct vm_store *store, off_t offset, const iovec *vecs, size_t c
|
||||
|
||||
|
||||
static status_t
|
||||
anonymous_write(struct vm_store *store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes)
|
||||
anonymous_write(struct vm_store *store, off_t offset, const iovec *vecs, size_t count,
|
||||
size_t *_numBytes, bool fsReenter)
|
||||
{
|
||||
// no place to write, this will cause the page daemon to skip this store
|
||||
return 0;
|
||||
|
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Copyright 2004-2005, Axel Dörfler, axeld@pinc-software.de.
|
||||
* Copyright 2004-2006, Axel Dörfler, axeld@pinc-software.de.
|
||||
* Distributed under the terms of the MIT License.
|
||||
*
|
||||
* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
|
||||
@ -45,7 +45,8 @@ device_has_page(struct vm_store *store, off_t offset)
|
||||
|
||||
|
||||
static status_t
|
||||
device_read(struct vm_store *store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes)
|
||||
device_read(struct vm_store *store, off_t offset, const iovec *vecs, size_t count,
|
||||
size_t *_numBytes, bool fsReenter)
|
||||
{
|
||||
panic("device_store: read called. Invalid!\n");
|
||||
return B_ERROR;
|
||||
@ -53,7 +54,8 @@ device_read(struct vm_store *store, off_t offset, const iovec *vecs, size_t coun
|
||||
|
||||
|
||||
static status_t
|
||||
device_write(struct vm_store *store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes)
|
||||
device_write(struct vm_store *store, off_t offset, const iovec *vecs, size_t count,
|
||||
size_t *_numBytes, bool fsReenter)
|
||||
{
|
||||
// no place to write, this will cause the page daemon to skip this store
|
||||
return B_OK;
|
||||
|
@ -1,7 +1,10 @@
|
||||
/*
|
||||
** Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
|
||||
** Distributed under the terms of the NewOS License.
|
||||
*/
|
||||
* Copyright 2004-2006, Axel Dörfler, axeld@pinc-software.de.
|
||||
* Distributed under the terms of the MIT License.
|
||||
*
|
||||
* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
|
||||
* Distributed under the terms of the NewOS License.
|
||||
*/
|
||||
|
||||
|
||||
#include "vm_store_null.h"
|
||||
@ -32,14 +35,16 @@ null_has_page(struct vm_store *store, off_t offset)
|
||||
|
||||
|
||||
static status_t
|
||||
null_read(struct vm_store *store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes)
|
||||
null_read(struct vm_store *store, off_t offset, const iovec *vecs, size_t count,
|
||||
size_t *_numBytes, bool fsReenter)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
static status_t
|
||||
null_write(struct vm_store *store, off_t offset, const iovec *vecs, size_t count, size_t *_numBytes)
|
||||
null_write(struct vm_store *store, off_t offset, const iovec *vecs, size_t count,
|
||||
size_t *_numBytes, bool fsReenter)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user