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author | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2012-11-02 17:10:40 +0900 |
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committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2012-12-11 13:43:41 +0900 |
commit | 19f99cee206cd4fe2e84176001bfd0b8b9dd4b42 (patch) | |
tree | 63323d02bf60215c73f36fb3a7550b35766d350a /fs | |
parent | eb47b8009dc969a3386c983bd5e798e9f690c5d9 (diff) | |
download | linux-19f99cee206cd4fe2e84176001bfd0b8b9dd4b42.tar.bz2 |
f2fs: add core inode operations
This adds core functions to get, read, write, and evict an inode.
Signed-off-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/f2fs/inode.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c new file mode 100644 index 000000000000..94f13d2815e9 --- /dev/null +++ b/fs/f2fs/inode.c @@ -0,0 +1,266 @@ +/** + * fs/f2fs/inode.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/buffer_head.h> +#include <linux/writeback.h> + +#include "f2fs.h" +#include "node.h" + +struct f2fs_iget_args { + u64 ino; + int on_free; +}; + +void f2fs_set_inode_flags(struct inode *inode) +{ + unsigned int flags = F2FS_I(inode)->i_flags; + + inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | + S_NOATIME | S_DIRSYNC); + + if (flags & FS_SYNC_FL) + inode->i_flags |= S_SYNC; + if (flags & FS_APPEND_FL) + inode->i_flags |= S_APPEND; + if (flags & FS_IMMUTABLE_FL) + inode->i_flags |= S_IMMUTABLE; + if (flags & FS_NOATIME_FL) + inode->i_flags |= S_NOATIME; + if (flags & FS_DIRSYNC_FL) + inode->i_flags |= S_DIRSYNC; +} + +static int f2fs_iget_test(struct inode *inode, void *data) +{ + struct f2fs_iget_args *args = data; + + if (inode->i_ino != args->ino) + return 0; + if (inode->i_state & (I_FREEING | I_WILL_FREE)) { + args->on_free = 1; + return 0; + } + return 1; +} + +struct inode *f2fs_iget_nowait(struct super_block *sb, unsigned long ino) +{ + struct f2fs_iget_args args = { + .ino = ino, + .on_free = 0 + }; + struct inode *inode = ilookup5(sb, ino, f2fs_iget_test, &args); + + if (inode) + return inode; + if (!args.on_free) + return f2fs_iget(sb, ino); + return ERR_PTR(-ENOENT); +} + +static int do_read_inode(struct inode *inode) +{ + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + struct f2fs_inode_info *fi = F2FS_I(inode); + struct page *node_page; + struct f2fs_node *rn; + struct f2fs_inode *ri; + + /* Check if ino is within scope */ + check_nid_range(sbi, inode->i_ino); + + node_page = get_node_page(sbi, inode->i_ino); + if (IS_ERR(node_page)) + return PTR_ERR(node_page); + + rn = page_address(node_page); + ri = &(rn->i); + + inode->i_mode = le16_to_cpu(ri->i_mode); + i_uid_write(inode, le32_to_cpu(ri->i_uid)); + i_gid_write(inode, le32_to_cpu(ri->i_gid)); + set_nlink(inode, le32_to_cpu(ri->i_links)); + inode->i_size = le64_to_cpu(ri->i_size); + inode->i_blocks = le64_to_cpu(ri->i_blocks); + + inode->i_atime.tv_sec = le64_to_cpu(ri->i_atime); + inode->i_ctime.tv_sec = le64_to_cpu(ri->i_ctime); + inode->i_mtime.tv_sec = le64_to_cpu(ri->i_mtime); + inode->i_atime.tv_nsec = le32_to_cpu(ri->i_atime_nsec); + inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec); + inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec); + inode->i_generation = le32_to_cpu(ri->i_generation); + + fi->i_current_depth = le32_to_cpu(ri->i_current_depth); + fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid); + fi->i_flags = le32_to_cpu(ri->i_flags); + fi->flags = 0; + fi->data_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver) - 1; + fi->i_advise = ri->i_advise; + get_extent_info(&fi->ext, ri->i_ext); + f2fs_put_page(node_page, 1); + return 0; +} + +struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) +{ + struct f2fs_sb_info *sbi = F2FS_SB(sb); + struct inode *inode; + int ret; + + inode = iget_locked(sb, ino); + if (!inode) + return ERR_PTR(-ENOMEM); + if (!(inode->i_state & I_NEW)) + return inode; + if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi)) + goto make_now; + + ret = do_read_inode(inode); + if (ret) + goto bad_inode; + + if (!sbi->por_doing && inode->i_nlink == 0) { + ret = -ENOENT; + goto bad_inode; + } + +make_now: + if (ino == F2FS_NODE_INO(sbi)) { + inode->i_mapping->a_ops = &f2fs_node_aops; + mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); + } else if (ino == F2FS_META_INO(sbi)) { + inode->i_mapping->a_ops = &f2fs_meta_aops; + mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); + } else if (S_ISREG(inode->i_mode)) { + inode->i_op = &f2fs_file_inode_operations; + inode->i_fop = &f2fs_file_operations; + inode->i_mapping->a_ops = &f2fs_dblock_aops; + } else if (S_ISDIR(inode->i_mode)) { + inode->i_op = &f2fs_dir_inode_operations; + inode->i_fop = &f2fs_dir_operations; + inode->i_mapping->a_ops = &f2fs_dblock_aops; + mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER_MOVABLE | + __GFP_ZERO); + } else if (S_ISLNK(inode->i_mode)) { + inode->i_op = &f2fs_symlink_inode_operations; + inode->i_mapping->a_ops = &f2fs_dblock_aops; + } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || + S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { + inode->i_op = &f2fs_special_inode_operations; + init_special_inode(inode, inode->i_mode, inode->i_rdev); + } else { + ret = -EIO; + goto bad_inode; + } + unlock_new_inode(inode); + + return inode; + +bad_inode: + iget_failed(inode); + return ERR_PTR(ret); +} + +void update_inode(struct inode *inode, struct page *node_page) +{ + struct f2fs_node *rn; + struct f2fs_inode *ri; + + wait_on_page_writeback(node_page); + + rn = page_address(node_page); + ri = &(rn->i); + + ri->i_mode = cpu_to_le16(inode->i_mode); + ri->i_advise = F2FS_I(inode)->i_advise; + ri->i_uid = cpu_to_le32(i_uid_read(inode)); + ri->i_gid = cpu_to_le32(i_gid_read(inode)); + ri->i_links = cpu_to_le32(inode->i_nlink); + ri->i_size = cpu_to_le64(i_size_read(inode)); + ri->i_blocks = cpu_to_le64(inode->i_blocks); + set_raw_extent(&F2FS_I(inode)->ext, &ri->i_ext); + + ri->i_atime = cpu_to_le64(inode->i_atime.tv_sec); + ri->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); + ri->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); + ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec); + ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); + ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); + ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth); + ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid); + ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags); + ri->i_generation = cpu_to_le32(inode->i_generation); + set_page_dirty(node_page); +} + +int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc) +{ + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + struct page *node_page; + bool need_lock = false; + + if (inode->i_ino == F2FS_NODE_INO(sbi) || + inode->i_ino == F2FS_META_INO(sbi)) + return 0; + + node_page = get_node_page(sbi, inode->i_ino); + if (IS_ERR(node_page)) + return PTR_ERR(node_page); + + if (!PageDirty(node_page)) { + need_lock = true; + f2fs_put_page(node_page, 1); + mutex_lock(&sbi->write_inode); + node_page = get_node_page(sbi, inode->i_ino); + if (IS_ERR(node_page)) { + mutex_unlock(&sbi->write_inode); + return PTR_ERR(node_page); + } + } + update_inode(inode, node_page); + f2fs_put_page(node_page, 1); + if (need_lock) + mutex_unlock(&sbi->write_inode); + return 0; +} + +/** + * Called at the last iput() if i_nlink is zero + */ +void f2fs_evict_inode(struct inode *inode) +{ + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + + truncate_inode_pages(&inode->i_data, 0); + + if (inode->i_ino == F2FS_NODE_INO(sbi) || + inode->i_ino == F2FS_META_INO(sbi)) + goto no_delete; + + BUG_ON(atomic_read(&F2FS_I(inode)->dirty_dents)); + remove_dirty_dir_inode(inode); + + if (inode->i_nlink || is_bad_inode(inode)) + goto no_delete; + + set_inode_flag(F2FS_I(inode), FI_NO_ALLOC); + i_size_write(inode, 0); + + if (F2FS_HAS_BLOCKS(inode)) + f2fs_truncate(inode); + + remove_inode_page(inode); +no_delete: + clear_inode(inode); +} |