Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * ifile.c - NILFS inode file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Written by Amagai Yoshiji.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Revised by Ryusuke Konishi.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "nilfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "mdt.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "alloc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "ifile.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * struct nilfs_ifile_info - on-memory private data of ifile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * @mi: on-memory private data of metadata file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * @palloc_cache: persistent object allocator cache of ifile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) struct nilfs_ifile_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct nilfs_mdt_info mi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	struct nilfs_palloc_cache palloc_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	return (struct nilfs_ifile_info *)NILFS_MDT(ifile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * nilfs_ifile_create_inode - create a new disk inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * @ifile: ifile inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * @out_ino: pointer to a variable to store inode number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * @out_bh: buffer_head contains newly allocated disk inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * Return Value: On success, 0 is returned and the newly allocated inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * number is stored in the place pointed by @ino, and buffer_head pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * that contains newly allocated disk inode structure is stored in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * place pointed by @out_bh
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * On error, one of the following negative error codes is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * %-EIO - I/O error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * %-ENOMEM - Insufficient amount of memory available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * %-ENOSPC - No inode left.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			     struct buffer_head **out_bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	struct nilfs_palloc_req req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	req.pr_entry_nr = 0;  /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 			       * 0 says find free inode from beginning
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 			       * of a group. dull code!!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			       */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	req.pr_entry_bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	ret = nilfs_palloc_prepare_alloc_entry(ifile, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 						   &req.pr_entry_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			nilfs_palloc_abort_alloc_entry(ifile, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		brelse(req.pr_entry_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	nilfs_palloc_commit_alloc_entry(ifile, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	mark_buffer_dirty(req.pr_entry_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	nilfs_mdt_mark_dirty(ifile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	*out_ino = (ino_t)req.pr_entry_nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	*out_bh = req.pr_entry_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  * nilfs_ifile_delete_inode - delete a disk inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  * @ifile: ifile inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  * @ino: inode number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  * Return Value: On success, 0 is returned. On error, one of the following
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  * negative error codes is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  * %-EIO - I/O error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  * %-ENOMEM - Insufficient amount of memory available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  * %-ENOENT - The inode number @ino have not been allocated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct nilfs_palloc_req req = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		.pr_entry_nr = ino, .pr_entry_bh = NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct nilfs_inode *raw_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	void *kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	ret = nilfs_palloc_prepare_free_entry(ifile, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 						   &req.pr_entry_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			nilfs_palloc_abort_free_entry(ifile, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		brelse(req.pr_entry_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	kaddr = kmap_atomic(req.pr_entry_bh->b_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 						 req.pr_entry_bh, kaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	raw_inode->i_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	kunmap_atomic(kaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	mark_buffer_dirty(req.pr_entry_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	brelse(req.pr_entry_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	nilfs_palloc_commit_free_entry(ifile, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 				struct buffer_head **out_bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	struct super_block *sb = ifile->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		nilfs_error(sb, "bad inode number: %lu", (unsigned long)ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (unlikely(err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		nilfs_warn(sb, "error %d reading inode: ino=%lu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			   err, (unsigned long)ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)  * nilfs_ifile_count_free_inodes - calculate free inodes count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)  * @ifile: ifile inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)  * @nmaxinodes: current maximum of available inodes count [out]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)  * @nfreeinodes: free inodes count [out]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) int nilfs_ifile_count_free_inodes(struct inode *ifile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 				    u64 *nmaxinodes, u64 *nfreeinodes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	u64 nused;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	*nmaxinodes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	*nfreeinodes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (likely(!err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		*nfreeinodes = *nmaxinodes - nused;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)  * nilfs_ifile_read - read or get ifile inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)  * @sb: super block instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)  * @root: root object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)  * @inode_size: size of an inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)  * @raw_inode: on-disk ifile inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)  * @inodep: buffer to store the inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		     size_t inode_size, struct nilfs_inode *raw_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		     struct inode **inodep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	struct inode *ifile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if (unlikely(!ifile))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (!(ifile->i_state & I_NEW))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			     sizeof(struct nilfs_ifile_info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	err = nilfs_palloc_init_blockgroup(ifile, inode_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	err = nilfs_read_inode_common(ifile, raw_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	unlock_new_inode(ifile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	*inodep = ifile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)  failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	iget_failed(ifile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }