diff options
| -rw-r--r-- | fs/f2fs/file.c | 637 |
1 files changed, 637 insertions, 0 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c new file mode 100644 index 000000000000..f5ae36d19f4f --- /dev/null +++ b/fs/f2fs/file.c @@ -0,0 +1,637 @@ +/** + * fs/f2fs/file.c + * + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/fs.h> +#include <linux/f2fs_fs.h> +#include <linux/stat.h> +#include <linux/buffer_head.h> +#include <linux/writeback.h> +#include <linux/falloc.h> +#include <linux/types.h> +#include <linux/uaccess.h> +#include <linux/mount.h> + +#include "f2fs.h" +#include "node.h" +#include "segment.h" +#include "xattr.h" +#include "acl.h" + +static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma, + struct vm_fault *vmf) +{ + struct page *page = vmf->page; + struct inode *inode = vma->vm_file->f_path.dentry->d_inode; + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + struct page *node_page; + block_t old_blk_addr; + struct dnode_of_data dn; + int err; + + f2fs_balance_fs(sbi); + + sb_start_pagefault(inode->i_sb); + + mutex_lock_op(sbi, DATA_NEW); + + /* block allocation */ + set_new_dnode(&dn, inode, NULL, NULL, 0); + err = get_dnode_of_data(&dn, page->index, 0); + if (err) { + mutex_unlock_op(sbi, DATA_NEW); + goto out; + } + + old_blk_addr = dn.data_blkaddr; + node_page = dn.node_page; + + if (old_blk_addr == NULL_ADDR) { + err = reserve_new_block(&dn); + if (err) { + f2fs_put_dnode(&dn); + mutex_unlock_op(sbi, DATA_NEW); + goto out; + } + } + f2fs_put_dnode(&dn); + + mutex_unlock_op(sbi, DATA_NEW); + + lock_page(page); + if (page->mapping != inode->i_mapping || + page_offset(page) >= i_size_read(inode) || + !PageUptodate(page)) { + unlock_page(page); + err = -EFAULT; + goto out; + } + + /* + * check to see if the page is mapped already (no holes) + */ + if (PageMappedToDisk(page)) + goto out; + + /* fill the page */ + wait_on_page_writeback(page); + + /* page is wholly or partially inside EOF */ + if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) { + unsigned offset; + offset = i_size_read(inode) & ~PAGE_CACHE_MASK; + zero_user_segment(page, offset, PAGE_CACHE_SIZE); + } + set_page_dirty(page); + SetPageUptodate(page); + + file_update_time(vma->vm_file); +out: + sb_end_pagefault(inode->i_sb); + return block_page_mkwrite_return(err); +} + +static const struct vm_operations_struct f2fs_file_vm_ops = { + .fault = filemap_fault, + .page_mkwrite = f2fs_vm_page_mkwrite, +}; + +static int need_to_sync_dir(struct f2fs_sb_info *sbi, struct inode *inode) +{ + struct dentry *dentry; + nid_t pino; + + inode = igrab(inode); + dentry = d_find_any_alias(inode); + if (!dentry) { + iput(inode); + return 0; + } + pino = dentry->d_parent->d_inode->i_ino; + dput(dentry); + iput(inode); + return !is_checkpointed_node(sbi, pino); +} + +int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) +{ + struct inode *inode = file->f_mapping->host; + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + unsigned long long cur_version; + int ret = 0; + bool need_cp = false; + struct writeback_control wbc = { + .sync_mode = WB_SYNC_ALL, + .nr_to_write = LONG_MAX, + .for_reclaim = 0, + }; + + ret = filemap_write_and_wait_range(inode->i_mapping, start, end); + if (ret) + return ret; + + mutex_lock(&inode->i_mutex); + + if (inode->i_sb->s_flags & MS_RDONLY) + goto out; + if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) + goto out; + + mutex_lock(&sbi->cp_mutex); + cur_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver); + mutex_unlock(&sbi->cp_mutex); + + if (F2FS_I(inode)->data_version != cur_version && + !(inode->i_state & I_DIRTY)) + goto out; + F2FS_I(inode)->data_version--; + + if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1) + need_cp = true; + if (is_inode_flag_set(F2FS_I(inode), FI_NEED_CP)) + need_cp = true; + if (!space_for_roll_forward(sbi)) + need_cp = true; + if (need_to_sync_dir(sbi, inode)) + need_cp = true; + + f2fs_write_inode(inode, NULL); + + if (need_cp) { + /* all the dirty node pages should be flushed for POR */ + ret = f2fs_sync_fs(inode->i_sb, 1); + clear_inode_flag(F2FS_I(inode), FI_NEED_CP); + } else { + while (sync_node_pages(sbi, inode->i_ino, &wbc) == 0) + f2fs_write_inode(inode, NULL); + filemap_fdatawait_range(sbi->node_inode->i_mapping, + 0, LONG_MAX); + } +out: + mutex_unlock(&inode->i_mutex); + return ret; +} + +static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma) +{ + file_accessed(file); + vma->vm_ops = &f2fs_file_vm_ops; + return 0; +} + +static int truncate_data_blocks_range(struct dnode_of_data *dn, int count) +{ + int nr_free = 0, ofs = dn->ofs_in_node; + struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); + struct f2fs_node *raw_node; + __le32 *addr; + + raw_node = page_address(dn->node_page); + addr = blkaddr_in_node(raw_node) + ofs; + + for ( ; count > 0; count--, addr++, dn->ofs_in_node++) { + block_t blkaddr = le32_to_cpu(*addr); + if (blkaddr == NULL_ADDR) + continue; + + update_extent_cache(NULL_ADDR, dn); + invalidate_blocks(sbi, blkaddr); + dec_valid_block_count(sbi, dn->inode, 1); + nr_free++; + } + if (nr_free) { + set_page_dirty(dn->node_page); + sync_inode_page(dn); + } + dn->ofs_in_node = ofs; + return nr_free; +} + +void truncate_data_blocks(struct dnode_of_data *dn) +{ + truncate_data_blocks_range(dn, ADDRS_PER_BLOCK); +} + +static void truncate_partial_data_page(struct inode *inode, u64 from) +{ + unsigned offset = from & (PAGE_CACHE_SIZE - 1); + struct page *page; + + if (!offset) + return; + + page = find_data_page(inode, from >> PAGE_CACHE_SHIFT); + if (IS_ERR(page)) + return; + + lock_page(page); + wait_on_page_writeback(page); + zero_user(page, offset, PAGE_CACHE_SIZE - offset); + set_page_dirty(page); + f2fs_put_page(page, 1); +} + +static int truncate_blocks(struct inode *inode, u64 from) +{ + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + unsigned int blocksize = inode->i_sb->s_blocksize; + struct dnode_of_data dn; + pgoff_t free_from; + int count = 0; + int err; + + free_from = (pgoff_t) + ((from + blocksize - 1) >> (sbi->log_blocksize)); + + mutex_lock_op(sbi, DATA_TRUNC); + + set_new_dnode(&dn, inode, NULL, NULL, 0); + err = get_dnode_of_data(&dn, free_from, RDONLY_NODE); + if (err) { + if (err == -ENOENT) + goto free_next; + mutex_unlock_op(sbi, DATA_TRUNC); + return err; + } + + if (IS_INODE(dn.node_page)) + count = ADDRS_PER_INODE; + else + count = ADDRS_PER_BLOCK; + + count -= dn.ofs_in_node; + BUG_ON(count < 0); + if (dn.ofs_in_node || IS_INODE(dn.node_page)) { + truncate_data_blocks_range(&dn, count); + free_from += count; + } + + f2fs_put_dnode(&dn); +free_next: + err = truncate_inode_blocks(inode, free_from); + mutex_unlock_op(sbi, DATA_TRUNC); + + /* lastly zero out the first data page */ + truncate_partial_data_page(inode, from); + + return err; +} + +void f2fs_truncate(struct inode *inode) +{ + if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || + S_ISLNK(inode->i_mode))) + return; + + if (!truncate_blocks(inode, i_size_read(inode))) { + inode->i_mtime = inode->i_ctime = CURRENT_TIME; + mark_inode_dirty(inode); + } + + f2fs_balance_fs(F2FS_SB(inode->i_sb)); +} + +static int f2fs_getattr(struct vfsmount *mnt, + struct dentry *dentry, struct kstat *stat) +{ + struct inode *inode = dentry->d_inode; + generic_fillattr(inode, stat); + stat->blocks <<= 3; + return 0; +} + +#ifdef CONFIG_F2FS_FS_POSIX_ACL +static void __setattr_copy(struct inode *inode, const struct iattr *attr) +{ + struct f2fs_inode_info *fi = F2FS_I(inode); + unsigned int ia_valid = attr->ia_valid; + + if (ia_valid & ATTR_UID) + inode->i_uid = attr->ia_uid; + if (ia_valid & ATTR_GID) + inode->i_gid = attr->ia_gid; + if (ia_valid & ATTR_ATIME) + inode->i_atime = timespec_trunc(attr->ia_atime, + inode->i_sb->s_time_gran); + if (ia_valid & ATTR_MTIME) + inode->i_mtime = timespec_trunc(attr->ia_mtime, + inode->i_sb->s_time_gran); + if (ia_valid & ATTR_CTIME) + inode->i_ctime = timespec_trunc(attr->ia_ctime, + inode->i_sb->s_time_gran); + if (ia_valid & ATTR_MODE) { + umode_t mode = attr->ia_mode; + + if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) + mode &= ~S_ISGID; + set_acl_inode(fi, mode); + } +} +#else +#define __setattr_copy setattr_copy +#endif + +int f2fs_setattr(struct dentry *dentry, struct iattr *attr) +{ + struct inode *inode = dentry->d_inode; + struct f2fs_inode_info *fi = F2FS_I(inode); + int err; + + err = inode_change_ok(inode, attr); + if (err) + return err; + + if ((attr->ia_valid & ATTR_SIZE) && + attr->ia_size != i_size_read(inode)) { + truncate_setsize(inode, attr->ia_size); + f2fs_truncate(inode); + } + + __setattr_copy(inode, attr); + + if (attr->ia_valid & ATTR_MODE) { + err = f2fs_acl_chmod(inode); + if (err || is_inode_flag_set(fi, FI_ACL_MODE)) { + inode->i_mode = fi->i_acl_mode; + clear_inode_flag(fi, FI_ACL_MODE); + } + } + + mark_inode_dirty(inode); + return err; +} + +const struct inode_operations f2fs_file_inode_operations = { + .getattr = f2fs_getattr, + .setattr = f2fs_setattr, + .get_acl = f2fs_get_acl, +#ifdef CONFIG_F2FS_FS_XATTR + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .listxattr = f2fs_listxattr, + .removexattr = generic_removexattr, +#endif +}; + +static void fill_zero(struct inode *inode, pgoff_t index, + loff_t start, loff_t len) +{ + struct page *page; + + if (!len) + return; + + page = get_new_data_page(inode, index, false); + + if (!IS_ERR(page)) { + wait_on_page_writeback(page); + zero_user(page, start, len); + set_page_dirty(page); + f2fs_put_page(page, 1); + } +} + +int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end) +{ + pgoff_t index; + int err; + + for (index = pg_start; index < pg_end; index++) { + struct dnode_of_data dn; + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + + mutex_lock_op(sbi, DATA_TRUNC); + set_new_dnode(&dn, inode, NULL, NULL, 0); + err = get_dnode_of_data(&dn, index, RDONLY_NODE); + if (err) { + mutex_unlock_op(sbi, DATA_TRUNC); + if (err == -ENOENT) + continue; + return err; + } + + if (dn.data_blkaddr != NULL_ADDR) + truncate_data_blocks_range(&dn, 1); + f2fs_put_dnode(&dn); + mutex_unlock_op(sbi, DATA_TRUNC); + } + return 0; +} + +static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode) +{ + pgoff_t pg_start, pg_end; + loff_t off_start, off_end; + int ret = 0; + + pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT; + pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT; + + off_start = offset & (PAGE_CACHE_SIZE - 1); + off_end = (offset + len) & (PAGE_CACHE_SIZE - 1); + + if (pg_start == pg_end) { + fill_zero(inode, pg_start, off_start, + off_end - off_start); + } else { + if (off_start) + fill_zero(inode, pg_start++, off_start, + PAGE_CACHE_SIZE - off_start); + if (off_end) + fill_zero(inode, pg_end, 0, off_end); + + if (pg_start < pg_end) { + struct address_space *mapping = inode->i_mapping; + loff_t blk_start, blk_end; + + blk_start = pg_start << PAGE_CACHE_SHIFT; + blk_end = pg_end << PAGE_CACHE_SHIFT; + truncate_inode_pages_range(mapping, blk_start, + blk_end - 1); + ret = truncate_hole(inode, pg_start, pg_end); + } + } + + if (!(mode & FALLOC_FL_KEEP_SIZE) && + i_size_read(inode) <= (offset + len)) { + i_size_write(inode, offset); + mark_inode_dirty(inode); + } + + return ret; +} + +static int expand_inode_data(struct inode *inode, loff_t offset, + loff_t len, int mode) +{ + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + pgoff_t index, pg_start, pg_end; + loff_t new_size = i_size_read(inode); + loff_t off_start, off_end; + int ret = 0; + + ret = inode_newsize_ok(inode, (len + offset)); + if (ret) + return ret; + + pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT; + pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT; + + off_start = offset & (PAGE_CACHE_SIZE - 1); + off_end = (offset + len) & (PAGE_CACHE_SIZE - 1); + + for (index = pg_start; index <= pg_end; index++) { + struct dnode_of_data dn; + + mutex_lock_op(sbi, DATA_NEW); + + set_new_dnode(&dn, inode, NULL, NULL, 0); + ret = get_dnode_of_data(&dn, index, 0); + if (ret) { + mutex_unlock_op(sbi, DATA_NEW); + break; + } + + if (dn.data_blkaddr == NULL_ADDR) { + ret = reserve_new_block(&dn); + if (ret) { + f2fs_put_dnode(&dn); + mutex_unlock_op(sbi, DATA_NEW); + break; + } + } + f2fs_put_dnode(&dn); + + mutex_unlock_op(sbi, DATA_NEW); + + if (pg_start == pg_end) + new_size = offset + len; + else if (index == pg_start && off_start) + new_size = (index + 1) << PAGE_CACHE_SHIFT; + else if (index == pg_end) + new_size = (index << PAGE_CACHE_SHIFT) + off_end; + else + new_size += PAGE_CACHE_SIZE; + } + + if (!(mode & FALLOC_FL_KEEP_SIZE) && + i_size_read(inode) < new_size) { + i_size_write(inode, new_size); + mark_inode_dirty(inode); + } + + return ret; +} + +static long f2fs_fallocate(struct file *file, int mode, + loff_t offset, loff_t len) +{ + struct inode *inode = file->f_path.dentry->d_inode; + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + long ret; + + if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) + return -EOPNOTSUPP; + + if (mode & FALLOC_FL_PUNCH_HOLE) + ret = punch_hole(inode, offset, len, mode); + else + ret = expand_inode_data(inode, offset, len, mode); + + f2fs_balance_fs(sbi); + return ret; +} + +#define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL)) +#define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL) + +static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags) +{ + if (S_ISDIR(mode)) + return flags; + else if (S_ISREG(mode)) + return flags & F2FS_REG_FLMASK; + else + return flags & F2FS_OTHER_FLMASK; +} + +long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct inode *inode = filp->f_dentry->d_inode; + struct f2fs_inode_info *fi = F2FS_I(inode); + unsigned int flags; + int ret; + + switch (cmd) { + case FS_IOC_GETFLAGS: + flags = fi->i_flags & FS_FL_USER_VISIBLE; + return put_user(flags, (int __user *) arg); + case FS_IOC_SETFLAGS: + { + unsigned int oldflags; + + ret = mnt_want_write(filp->f_path.mnt); + if (ret) + return ret; + + if (!inode_owner_or_capable(inode)) { + ret = -EACCES; + goto out; + } + + if (get_user(flags, (int __user *) arg)) { + ret = -EFAULT; + goto out; + } + + flags = f2fs_mask_flags(inode->i_mode, flags); + + mutex_lock(&inode->i_mutex); + + oldflags = fi->i_flags; + + if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { + if (!capable(CAP_LINUX_IMMUTABLE)) { + mutex_unlock(&inode->i_mutex); + ret = -EPERM; + goto out; + } + } + + flags = flags & FS_FL_USER_MODIFIABLE; + flags |= oldflags & ~FS_FL_USER_MODIFIABLE; + fi->i_flags = flags; + mutex_unlock(&inode->i_mutex); + + f2fs_set_inode_flags(inode); + inode->i_ctime = CURRENT_TIME; + mark_inode_dirty(inode); +out: + mnt_drop_write(filp->f_path.mnt); + return ret; + } + default: + return -ENOTTY; + } +} + +const struct file_operations f2fs_file_operations = { + .llseek = generic_file_llseek, + .read = do_sync_read, + .write = do_sync_write, + .aio_read = generic_file_aio_read, + .aio_write = generic_file_aio_write, + .open = generic_file_open, + .mmap = f2fs_file_mmap, + .fsync = f2fs_sync_file, + .fallocate = f2fs_fallocate, + .unlocked_ioctl = f2fs_ioctl, + .splice_read = generic_file_splice_read, + .splice_write = generic_file_splice_write, +}; |