diff options
Diffstat (limited to 'fs/reiserfs/file.c')
| -rw-r--r-- | fs/reiserfs/file.c | 61 |
1 files changed, 1 insertions, 60 deletions
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c index 6165bd4..dcaafcf 100644 --- a/fs/reiserfs/file.c +++ b/fs/reiserfs/file.c @@ -234,68 +234,9 @@ int reiserfs_commit_page(struct inode *inode, struct page *page, return ret; } -/* Write @count bytes at position @ppos in a file indicated by @file - from the buffer @buf. - - generic_file_write() is only appropriate for filesystems that are not seeking to optimize performance and want - something simple that works. It is not for serious use by general purpose filesystems, excepting the one that it was - written for (ext2/3). This is for several reasons: - - * It has no understanding of any filesystem specific optimizations. - - * It enters the filesystem repeatedly for each page that is written. - - * It depends on reiserfs_get_block() function which if implemented by reiserfs performs costly search_by_key - * operation for each page it is supplied with. By contrast reiserfs_file_write() feeds as much as possible at a time - * to reiserfs which allows for fewer tree traversals. - - * Each indirect pointer insertion takes a lot of cpu, because it involves memory moves inside of blocks. - - * Asking the block allocation code for blocks one at a time is slightly less efficient. - - All of these reasons for not using only generic file write were understood back when reiserfs was first miscoded to - use it, but we were in a hurry to make code freeze, and so it couldn't be revised then. This new code should make - things right finally. - - Future Features: providing search_by_key with hints. - -*/ -static ssize_t reiserfs_file_write(struct file *file, /* the file we are going to write into */ - const char __user * buf, /* pointer to user supplied data - (in userspace) */ - size_t count, /* amount of bytes to write */ - loff_t * ppos /* pointer to position in file that we start writing at. Should be updated to - * new current position before returning. */ - ) -{ - struct inode *inode = file_inode(file); // Inode of the file that we are writing to. - /* To simplify coding at this time, we store - locked pages in array for now */ - struct reiserfs_transaction_handle th; - th.t_trans_id = 0; - - /* If a filesystem is converted from 3.5 to 3.6, we'll have v3.5 items - * lying around (most of the disk, in fact). Despite the filesystem - * now being a v3.6 format, the old items still can't support large - * file sizes. Catch this case here, as the rest of the VFS layer is - * oblivious to the different limitations between old and new items. - * reiserfs_setattr catches this for truncates. This chunk is lifted - * from generic_write_checks. */ - if (get_inode_item_key_version (inode) == KEY_FORMAT_3_5 && - *ppos + count > MAX_NON_LFS) { - if (*ppos >= MAX_NON_LFS) { - return -EFBIG; - } - if (count > MAX_NON_LFS - (unsigned long)*ppos) - count = MAX_NON_LFS - (unsigned long)*ppos; - } - - return do_sync_write(file, buf, count, ppos); -} - const struct file_operations reiserfs_file_operations = { .read = do_sync_read, - .write = reiserfs_file_write, + .write = do_sync_write, .unlocked_ioctl = reiserfs_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = reiserfs_compat_ioctl, |
