diff options
| -rw-r--r-- | fs/ocfs2/aops.c | 56 | ||||
| -rw-r--r-- | fs/ocfs2/aops.h | 9 | ||||
| -rw-r--r-- | fs/ocfs2/file.c | 7 | ||||
| -rw-r--r-- | fs/ocfs2/mmap.c | 167 |
4 files changed, 200 insertions, 39 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index fc723fb9c98..b8869fd0884 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -1034,7 +1034,8 @@ out: */ static int ocfs2_grab_pages_for_write(struct address_space *mapping, struct ocfs2_write_ctxt *wc, - u32 cpos, loff_t user_pos, int new) + u32 cpos, loff_t user_pos, int new, + struct page *mmap_page) { int ret = 0, i; unsigned long start, target_index, index; @@ -1058,11 +1059,36 @@ static int ocfs2_grab_pages_for_write(struct address_space *mapping, for(i = 0; i < wc->w_num_pages; i++) { index = start + i; - wc->w_pages[i] = find_or_create_page(mapping, index, GFP_NOFS); - if (!wc->w_pages[i]) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; + if (index == target_index && mmap_page) { + /* + * ocfs2_pagemkwrite() is a little different + * and wants us to directly use the page + * passed in. + */ + lock_page(mmap_page); + + if (mmap_page->mapping != mapping) { + unlock_page(mmap_page); + /* + * Sanity check - the locking in + * ocfs2_pagemkwrite() should ensure + * that this code doesn't trigger. + */ + ret = -EINVAL; + mlog_errno(ret); + goto out; + } + + page_cache_get(mmap_page); + wc->w_pages[i] = mmap_page; + } else { + wc->w_pages[i] = find_or_create_page(mapping, index, + GFP_NOFS); + if (!wc->w_pages[i]) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } } if (index == target_index) @@ -1213,10 +1239,10 @@ static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, } } -static int ocfs2_write_begin_nolock(struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata, - struct buffer_head *di_bh) +int ocfs2_write_begin_nolock(struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata, + struct buffer_head *di_bh, struct page *mmap_page) { int ret, i, credits = OCFS2_INODE_UPDATE_CREDITS; unsigned int num_clusters = 0, clusters_to_alloc = 0; @@ -1318,7 +1344,7 @@ static int ocfs2_write_begin_nolock(struct address_space *mapping, * extent. */ ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, - clusters_to_alloc); + clusters_to_alloc, mmap_page); if (ret) { mlog_errno(ret); goto out_commit; @@ -1386,7 +1412,7 @@ int ocfs2_write_begin(struct file *file, struct address_space *mapping, } ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep, - fsdata, di_bh); + fsdata, di_bh, NULL); if (ret) { mlog_errno(ret); goto out_fail_data; @@ -1407,9 +1433,9 @@ out_fail: return ret; } -static int ocfs2_write_end_nolock(struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *page, void *fsdata) +int ocfs2_write_end_nolock(struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) { int i; unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h index bdcdd1ae63a..389579bd64e 100644 --- a/fs/ocfs2/aops.h +++ b/fs/ocfs2/aops.h @@ -50,6 +50,15 @@ int ocfs2_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata); +int ocfs2_write_end_nolock(struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata); + +int ocfs2_write_begin_nolock(struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata, + struct buffer_head *di_bh, struct page *mmap_page); + /* all ocfs2_dio_end_io()'s fault */ #define ocfs2_iocb_is_rw_locked(iocb) \ test_bit(0, (unsigned long *)&iocb->private) diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 4c850d00c26..a80f31776d9 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -1001,6 +1001,13 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) goto bail_unlock; } + /* + * This will intentionally not wind up calling vmtruncate(), + * since all the work for a size change has been done above. + * Otherwise, we could get into problems with truncate as + * ip_alloc_sem is used there to protect against i_size + * changes. + */ status = inode_setattr(inode, attr); if (status < 0) { mlog_errno(status); diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c index af01158b39f..d79aa12137d 100644 --- a/fs/ocfs2/mmap.c +++ b/fs/ocfs2/mmap.c @@ -37,11 +37,29 @@ #include "ocfs2.h" +#include "aops.h" #include "dlmglue.h" #include "file.h" #include "inode.h" #include "mmap.h" +static inline int ocfs2_vm_op_block_sigs(sigset_t *blocked, sigset_t *oldset) +{ + /* The best way to deal with signals in the vm path is + * to block them upfront, rather than allowing the + * locking paths to return -ERESTARTSYS. */ + sigfillset(blocked); + + /* We should technically never get a bad return value + * from sigprocmask */ + return sigprocmask(SIG_BLOCK, blocked, oldset); +} + +static inline int ocfs2_vm_op_unblock_sigs(sigset_t *oldset) +{ + return sigprocmask(SIG_SETMASK, oldset, NULL); +} + static struct page *ocfs2_nopage(struct vm_area_struct * area, unsigned long address, int *type) @@ -53,14 +71,7 @@ static struct page *ocfs2_nopage(struct vm_area_struct * area, mlog_entry("(area=%p, address=%lu, type=%p)\n", area, address, type); - /* The best way to deal with signals in this path is - * to block them upfront, rather than allowing the - * locking paths to return -ERESTARTSYS. */ - sigfillset(&blocked); - - /* We should technically never get a bad ret return - * from sigprocmask */ - ret = sigprocmask(SIG_BLOCK, &blocked, &oldset); + ret = ocfs2_vm_op_block_sigs(&blocked, &oldset); if (ret < 0) { mlog_errno(ret); goto out; @@ -68,7 +79,7 @@ static struct page *ocfs2_nopage(struct vm_area_struct * area, page = filemap_nopage(area, address, type); - ret = sigprocmask(SIG_SETMASK, &oldset, NULL); + ret = ocfs2_vm_op_unblock_sigs(&oldset); if (ret < 0) mlog_errno(ret); out: @@ -76,28 +87,136 @@ out: return page; } -static struct vm_operations_struct ocfs2_file_vm_ops = { - .nopage = ocfs2_nopage, -}; +static int __ocfs2_page_mkwrite(struct inode *inode, struct buffer_head *di_bh, + struct page *page) +{ + int ret; + struct address_space *mapping = inode->i_mapping; + loff_t pos = page->index << PAGE_CACHE_SHIFT; + unsigned int len = PAGE_CACHE_SIZE; + pgoff_t last_index; + struct page *locked_page = NULL; + void *fsdata; + loff_t size = i_size_read(inode); -int ocfs2_mmap(struct file *file, struct vm_area_struct *vma) + /* + * Another node might have truncated while we were waiting on + * cluster locks. + */ + last_index = size >> PAGE_CACHE_SHIFT; + if (page->index > last_index) { + ret = -EINVAL; + goto out; + } + + /* + * The i_size check above doesn't catch the case where nodes + * truncated and then re-extended the file. We'll re-check the + * page mapping after taking the page lock inside of + * ocfs2_write_begin_nolock(). + */ + if (!PageUptodate(page) || page->mapping != inode->i_mapping) { + ret = -EINVAL; + goto out; + } + + /* + * Call ocfs2_write_begin() and ocfs2_write_end() to take + * advantage of the allocation code there. We pass a write + * length of the whole page (chopped to i_size) to make sure + * the whole thing is allocated. + * + * Since we know the page is up to date, we don't have to + * worry about ocfs2_write_begin() skipping some buffer reads + * because the "write" would invalidate their data. + */ + if (page->index == last_index) + len = size & ~PAGE_CACHE_MASK; + + ret = ocfs2_write_begin_nolock(mapping, pos, len, 0, &locked_page, + &fsdata, di_bh, page); + if (ret) { + if (ret != -ENOSPC) + mlog_errno(ret); + goto out; + } + + ret = ocfs2_write_end_nolock(mapping, pos, len, len, locked_page, + fsdata); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + BUG_ON(ret != len); + ret = 0; +out: + return ret; +} + +static int ocfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page) { - int ret = 0, lock_level = 0; - struct ocfs2_super *osb = OCFS2_SB(file->f_dentry->d_inode->i_sb); + struct inode *inode = vma->vm_file->f_path.dentry->d_inode; + struct buffer_head *di_bh = NULL; + sigset_t blocked, oldset; + int ret, ret2; + + ret = ocfs2_vm_op_block_sigs(&blocked, &oldset); + if (ret < 0) { + mlog_errno(ret); + return ret; + } + + /* + * The cluster locks taken will block a truncate from another + * node. Taking the data lock will also ensure that we don't + * attempt page truncation as part of a downconvert. + */ + ret = ocfs2_meta_lock(inode, &di_bh, 1); + if (ret < 0) { + mlog_errno(ret); + goto out; + } /* - * Only support shared writeable mmap for local mounts which - * don't know about holes. + * The alloc sem should be enough to serialize with + * ocfs2_truncate_file() changing i_size as well as any thread + * modifying the inode btree. */ - if ((!ocfs2_mount_local(osb) || ocfs2_sparse_alloc(osb)) && - ((vma->vm_flags & VM_SHARED) || (vma->vm_flags & VM_MAYSHARE)) && - ((vma->vm_flags & VM_WRITE) || (vma->vm_flags & VM_MAYWRITE))) { - mlog(0, "disallow shared writable mmaps %lx\n", vma->vm_flags); - /* This is -EINVAL because generic_file_readonly_mmap - * returns it in a similar situation. */ - return -EINVAL; + down_write(&OCFS2_I(inode)->ip_alloc_sem); + + ret = ocfs2_data_lock(inode, 1); + if (ret < 0) { + mlog_errno(ret); + goto out_meta_unlock; } + ret = __ocfs2_page_mkwrite(inode, di_bh, page); + + ocfs2_data_unlock(inode, 1); + +out_meta_unlock: + up_write(&OCFS2_I(inode)->ip_alloc_sem); + + brelse(di_bh); + ocfs2_meta_unlock(inode, 1); + +out: + ret2 = ocfs2_vm_op_unblock_sigs(&oldset); + if (ret2 < 0) + mlog_errno(ret2); + + return ret; +} + +static struct vm_operations_struct ocfs2_file_vm_ops = { + .nopage = ocfs2_nopage, + .page_mkwrite = ocfs2_page_mkwrite, +}; + +int ocfs2_mmap(struct file *file, struct vm_area_struct *vma) +{ + int ret = 0, lock_level = 0; + ret = ocfs2_meta_lock_atime(file->f_dentry->d_inode, file->f_vfsmnt, &lock_level); if (ret < 0) { |