diff options
Diffstat (limited to 'fs/reiserfs/file.c')
| -rw-r--r-- | fs/reiserfs/file.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c new file mode 100644 index 0000000000..8eb3ad3e8a --- /dev/null +++ b/fs/reiserfs/file.c @@ -0,0 +1,270 @@ +/* + * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README + */ + +#include <linux/time.h> +#include "reiserfs.h" +#include "acl.h" +#include "xattr.h" +#include <linux/uaccess.h> +#include <linux/pagemap.h> +#include <linux/swap.h> +#include <linux/writeback.h> +#include <linux/blkdev.h> +#include <linux/buffer_head.h> +#include <linux/quotaops.h> + +/* + * We pack the tails of files on file close, not at the time they are written. + * This implies an unnecessary copy of the tail and an unnecessary indirect item + * insertion/balancing, for files that are written in one write. + * It avoids unnecessary tail packings (balances) for files that are written in + * multiple writes and are small enough to have tails. + * + * file_release is called by the VFS layer when the file is closed. If + * this is the last open file descriptor, and the file + * small enough to have a tail, and the tail is currently in an + * unformatted node, the tail is converted back into a direct item. + * + * We use reiserfs_truncate_file to pack the tail, since it already has + * all the conditions coded. + */ +static int reiserfs_file_release(struct inode *inode, struct file *filp) +{ + + struct reiserfs_transaction_handle th; + int err; + int jbegin_failure = 0; + + BUG_ON(!S_ISREG(inode->i_mode)); + + if (!atomic_dec_and_mutex_lock(&REISERFS_I(inode)->openers, + &REISERFS_I(inode)->tailpack)) + return 0; + + /* fast out for when nothing needs to be done */ + if ((!(REISERFS_I(inode)->i_flags & i_pack_on_close_mask) || + !tail_has_to_be_packed(inode)) && + REISERFS_I(inode)->i_prealloc_count <= 0) { + mutex_unlock(&REISERFS_I(inode)->tailpack); + return 0; + } + + reiserfs_write_lock(inode->i_sb); + /* + * freeing preallocation only involves relogging blocks that + * are already in the current transaction. preallocation gets + * freed at the end of each transaction, so it is impossible for + * us to log any additional blocks (including quota blocks) + */ + err = journal_begin(&th, inode->i_sb, 1); + if (err) { + /* + * uh oh, we can't allow the inode to go away while there + * is still preallocation blocks pending. Try to join the + * aborted transaction + */ + jbegin_failure = err; + err = journal_join_abort(&th, inode->i_sb); + + if (err) { + /* + * hmpf, our choices here aren't good. We can pin + * the inode which will disallow unmount from ever + * happening, we can do nothing, which will corrupt + * random memory on unmount, or we can forcibly + * remove the file from the preallocation list, which + * will leak blocks on disk. Lets pin the inode + * and let the admin know what is going on. + */ + igrab(inode); + reiserfs_warning(inode->i_sb, "clm-9001", + "pinning inode %lu because the " + "preallocation can't be freed", + inode->i_ino); + goto out; + } + } + reiserfs_update_inode_transaction(inode); + +#ifdef REISERFS_PREALLOCATE + reiserfs_discard_prealloc(&th, inode); +#endif + err = journal_end(&th); + + /* copy back the error code from journal_begin */ + if (!err) + err = jbegin_failure; + + if (!err && + (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) && + tail_has_to_be_packed(inode)) { + + /* + * if regular file is released by last holder and it has been + * appended (we append by unformatted node only) or its direct + * item(s) had to be converted, then it may have to be + * indirect2direct converted + */ + err = reiserfs_truncate_file(inode, 0); + } +out: + reiserfs_write_unlock(inode->i_sb); + mutex_unlock(&REISERFS_I(inode)->tailpack); + return err; +} + +static int reiserfs_file_open(struct inode *inode, struct file *file) +{ + int err = dquot_file_open(inode, file); + + /* somebody might be tailpacking on final close; wait for it */ + if (!atomic_inc_not_zero(&REISERFS_I(inode)->openers)) { + mutex_lock(&REISERFS_I(inode)->tailpack); + atomic_inc(&REISERFS_I(inode)->openers); + mutex_unlock(&REISERFS_I(inode)->tailpack); + } + return err; +} + +void reiserfs_vfs_truncate_file(struct inode *inode) +{ + mutex_lock(&REISERFS_I(inode)->tailpack); + reiserfs_truncate_file(inode, 1); + mutex_unlock(&REISERFS_I(inode)->tailpack); +} + +/* Sync a reiserfs file. */ + +/* + * FIXME: sync_mapping_buffers() never has anything to sync. Can + * be removed... + */ + +static int reiserfs_sync_file(struct file *filp, loff_t start, loff_t end, + int datasync) +{ + struct inode *inode = filp->f_mapping->host; + int err; + int barrier_done; + + err = file_write_and_wait_range(filp, start, end); + if (err) + return err; + + inode_lock(inode); + BUG_ON(!S_ISREG(inode->i_mode)); + err = sync_mapping_buffers(inode->i_mapping); + reiserfs_write_lock(inode->i_sb); + barrier_done = reiserfs_commit_for_inode(inode); + reiserfs_write_unlock(inode->i_sb); + if (barrier_done != 1 && reiserfs_barrier_flush(inode->i_sb)) + blkdev_issue_flush(inode->i_sb->s_bdev); + inode_unlock(inode); + if (barrier_done < 0) + return barrier_done; + return (err < 0) ? -EIO : 0; +} + +/* taken fs/buffer.c:__block_commit_write */ +int reiserfs_commit_page(struct inode *inode, struct page *page, + unsigned from, unsigned to) +{ + unsigned block_start, block_end; + int partial = 0; + unsigned blocksize; + struct buffer_head *bh, *head; + unsigned long i_size_index = inode->i_size >> PAGE_SHIFT; + int new; + int logit = reiserfs_file_data_log(inode); + struct super_block *s = inode->i_sb; + int bh_per_page = PAGE_SIZE / s->s_blocksize; + struct reiserfs_transaction_handle th; + int ret = 0; + + th.t_trans_id = 0; + blocksize = i_blocksize(inode); + + if (logit) { + reiserfs_write_lock(s); + ret = journal_begin(&th, s, bh_per_page + 1); + if (ret) + goto drop_write_lock; + reiserfs_update_inode_transaction(inode); + } + for (bh = head = page_buffers(page), block_start = 0; + bh != head || !block_start; + block_start = block_end, bh = bh->b_this_page) { + + new = buffer_new(bh); + clear_buffer_new(bh); + block_end = block_start + blocksize; + if (block_end <= from || block_start >= to) { + if (!buffer_uptodate(bh)) + partial = 1; + } else { + set_buffer_uptodate(bh); + if (logit) { + reiserfs_prepare_for_journal(s, bh, 1); + journal_mark_dirty(&th, bh); + } else if (!buffer_dirty(bh)) { + mark_buffer_dirty(bh); + /* + * do data=ordered on any page past the end + * of file and any buffer marked BH_New. + */ + if (reiserfs_data_ordered(inode->i_sb) && + (new || page->index >= i_size_index)) { + reiserfs_add_ordered_list(inode, bh); + } + } + } + } + if (logit) { + ret = journal_end(&th); +drop_write_lock: + reiserfs_write_unlock(s); + } + /* + * If this is a partial write which happened to make all buffers + * uptodate then we can optimize away a bogus read_folio() for + * the next read(). Here we 'discover' whether the page went + * uptodate as a result of this (potentially partial) write. + */ + if (!partial) + SetPageUptodate(page); + return ret; +} + +const struct file_operations reiserfs_file_operations = { + .unlocked_ioctl = reiserfs_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = reiserfs_compat_ioctl, +#endif + .mmap = generic_file_mmap, + .open = reiserfs_file_open, + .release = reiserfs_file_release, + .fsync = reiserfs_sync_file, + .read_iter = generic_file_read_iter, + .write_iter = generic_file_write_iter, + .splice_read = filemap_splice_read, + .splice_write = iter_file_splice_write, + .llseek = generic_file_llseek, +}; + +const struct inode_operations reiserfs_file_inode_operations = { + .setattr = reiserfs_setattr, + .listxattr = reiserfs_listxattr, + .permission = reiserfs_permission, + .get_inode_acl = reiserfs_get_acl, + .set_acl = reiserfs_set_acl, + .fileattr_get = reiserfs_fileattr_get, + .fileattr_set = reiserfs_fileattr_set, +}; + +const struct inode_operations reiserfs_priv_file_inode_operations = { + .setattr = reiserfs_setattr, + .permission = reiserfs_permission, + .fileattr_get = reiserfs_fileattr_get, + .fileattr_set = reiserfs_fileattr_set, +}; |