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0001 // SPDX-License-Identifier: LGPL-2.1
0002 /*
0003  * Copyright (c) 2012 Taobao.
0004  * Written by Tao Ma <boyu.mt@taobao.com>
0005  */
0006 
0007 #include <linux/iomap.h>
0008 #include <linux/fiemap.h>
0009 #include <linux/namei.h>
0010 #include <linux/iversion.h>
0011 #include <linux/sched/mm.h>
0012 
0013 #include "ext4_jbd2.h"
0014 #include "ext4.h"
0015 #include "xattr.h"
0016 #include "truncate.h"
0017 
0018 #define EXT4_XATTR_SYSTEM_DATA  "data"
0019 #define EXT4_MIN_INLINE_DATA_SIZE   ((sizeof(__le32) * EXT4_N_BLOCKS))
0020 #define EXT4_INLINE_DOTDOT_OFFSET   2
0021 #define EXT4_INLINE_DOTDOT_SIZE     4
0022 
0023 static int ext4_get_inline_size(struct inode *inode)
0024 {
0025     if (EXT4_I(inode)->i_inline_off)
0026         return EXT4_I(inode)->i_inline_size;
0027 
0028     return 0;
0029 }
0030 
0031 static int get_max_inline_xattr_value_size(struct inode *inode,
0032                        struct ext4_iloc *iloc)
0033 {
0034     struct ext4_xattr_ibody_header *header;
0035     struct ext4_xattr_entry *entry;
0036     struct ext4_inode *raw_inode;
0037     int free, min_offs;
0038 
0039     if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
0040         return 0;
0041 
0042     min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
0043             EXT4_GOOD_OLD_INODE_SIZE -
0044             EXT4_I(inode)->i_extra_isize -
0045             sizeof(struct ext4_xattr_ibody_header);
0046 
0047     /*
0048      * We need to subtract another sizeof(__u32) since an in-inode xattr
0049      * needs an empty 4 bytes to indicate the gap between the xattr entry
0050      * and the name/value pair.
0051      */
0052     if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
0053         return EXT4_XATTR_SIZE(min_offs -
0054             EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
0055             EXT4_XATTR_ROUND - sizeof(__u32));
0056 
0057     raw_inode = ext4_raw_inode(iloc);
0058     header = IHDR(inode, raw_inode);
0059     entry = IFIRST(header);
0060 
0061     /* Compute min_offs. */
0062     for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
0063         if (!entry->e_value_inum && entry->e_value_size) {
0064             size_t offs = le16_to_cpu(entry->e_value_offs);
0065             if (offs < min_offs)
0066                 min_offs = offs;
0067         }
0068     }
0069     free = min_offs -
0070         ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
0071 
0072     if (EXT4_I(inode)->i_inline_off) {
0073         entry = (struct ext4_xattr_entry *)
0074             ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
0075 
0076         free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
0077         goto out;
0078     }
0079 
0080     free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
0081 
0082     if (free > EXT4_XATTR_ROUND)
0083         free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
0084     else
0085         free = 0;
0086 
0087 out:
0088     return free;
0089 }
0090 
0091 /*
0092  * Get the maximum size we now can store in an inode.
0093  * If we can't find the space for a xattr entry, don't use the space
0094  * of the extents since we have no space to indicate the inline data.
0095  */
0096 int ext4_get_max_inline_size(struct inode *inode)
0097 {
0098     int error, max_inline_size;
0099     struct ext4_iloc iloc;
0100 
0101     if (EXT4_I(inode)->i_extra_isize == 0)
0102         return 0;
0103 
0104     error = ext4_get_inode_loc(inode, &iloc);
0105     if (error) {
0106         ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
0107                      "can't get inode location %lu",
0108                      inode->i_ino);
0109         return 0;
0110     }
0111 
0112     down_read(&EXT4_I(inode)->xattr_sem);
0113     max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
0114     up_read(&EXT4_I(inode)->xattr_sem);
0115 
0116     brelse(iloc.bh);
0117 
0118     if (!max_inline_size)
0119         return 0;
0120 
0121     return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
0122 }
0123 
0124 /*
0125  * this function does not take xattr_sem, which is OK because it is
0126  * currently only used in a code path coming form ext4_iget, before
0127  * the new inode has been unlocked
0128  */
0129 int ext4_find_inline_data_nolock(struct inode *inode)
0130 {
0131     struct ext4_xattr_ibody_find is = {
0132         .s = { .not_found = -ENODATA, },
0133     };
0134     struct ext4_xattr_info i = {
0135         .name_index = EXT4_XATTR_INDEX_SYSTEM,
0136         .name = EXT4_XATTR_SYSTEM_DATA,
0137     };
0138     int error;
0139 
0140     if (EXT4_I(inode)->i_extra_isize == 0)
0141         return 0;
0142 
0143     error = ext4_get_inode_loc(inode, &is.iloc);
0144     if (error)
0145         return error;
0146 
0147     error = ext4_xattr_ibody_find(inode, &i, &is);
0148     if (error)
0149         goto out;
0150 
0151     if (!is.s.not_found) {
0152         if (is.s.here->e_value_inum) {
0153             EXT4_ERROR_INODE(inode, "inline data xattr refers "
0154                      "to an external xattr inode");
0155             error = -EFSCORRUPTED;
0156             goto out;
0157         }
0158         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
0159                     (void *)ext4_raw_inode(&is.iloc));
0160         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
0161                 le32_to_cpu(is.s.here->e_value_size);
0162         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
0163     }
0164 out:
0165     brelse(is.iloc.bh);
0166     return error;
0167 }
0168 
0169 static int ext4_read_inline_data(struct inode *inode, void *buffer,
0170                  unsigned int len,
0171                  struct ext4_iloc *iloc)
0172 {
0173     struct ext4_xattr_entry *entry;
0174     struct ext4_xattr_ibody_header *header;
0175     int cp_len = 0;
0176     struct ext4_inode *raw_inode;
0177 
0178     if (!len)
0179         return 0;
0180 
0181     BUG_ON(len > EXT4_I(inode)->i_inline_size);
0182 
0183     cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
0184             len : EXT4_MIN_INLINE_DATA_SIZE;
0185 
0186     raw_inode = ext4_raw_inode(iloc);
0187     memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
0188 
0189     len -= cp_len;
0190     buffer += cp_len;
0191 
0192     if (!len)
0193         goto out;
0194 
0195     header = IHDR(inode, raw_inode);
0196     entry = (struct ext4_xattr_entry *)((void *)raw_inode +
0197                         EXT4_I(inode)->i_inline_off);
0198     len = min_t(unsigned int, len,
0199             (unsigned int)le32_to_cpu(entry->e_value_size));
0200 
0201     memcpy(buffer,
0202            (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
0203     cp_len += len;
0204 
0205 out:
0206     return cp_len;
0207 }
0208 
0209 /*
0210  * write the buffer to the inline inode.
0211  * If 'create' is set, we don't need to do the extra copy in the xattr
0212  * value since it is already handled by ext4_xattr_ibody_set.
0213  * That saves us one memcpy.
0214  */
0215 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
0216                    void *buffer, loff_t pos, unsigned int len)
0217 {
0218     struct ext4_xattr_entry *entry;
0219     struct ext4_xattr_ibody_header *header;
0220     struct ext4_inode *raw_inode;
0221     int cp_len = 0;
0222 
0223     if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
0224         return;
0225 
0226     BUG_ON(!EXT4_I(inode)->i_inline_off);
0227     BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
0228 
0229     raw_inode = ext4_raw_inode(iloc);
0230     buffer += pos;
0231 
0232     if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
0233         cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
0234              EXT4_MIN_INLINE_DATA_SIZE - pos : len;
0235         memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
0236 
0237         len -= cp_len;
0238         buffer += cp_len;
0239         pos += cp_len;
0240     }
0241 
0242     if (!len)
0243         return;
0244 
0245     pos -= EXT4_MIN_INLINE_DATA_SIZE;
0246     header = IHDR(inode, raw_inode);
0247     entry = (struct ext4_xattr_entry *)((void *)raw_inode +
0248                         EXT4_I(inode)->i_inline_off);
0249 
0250     memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
0251            buffer, len);
0252 }
0253 
0254 static int ext4_create_inline_data(handle_t *handle,
0255                    struct inode *inode, unsigned len)
0256 {
0257     int error;
0258     void *value = NULL;
0259     struct ext4_xattr_ibody_find is = {
0260         .s = { .not_found = -ENODATA, },
0261     };
0262     struct ext4_xattr_info i = {
0263         .name_index = EXT4_XATTR_INDEX_SYSTEM,
0264         .name = EXT4_XATTR_SYSTEM_DATA,
0265     };
0266 
0267     error = ext4_get_inode_loc(inode, &is.iloc);
0268     if (error)
0269         return error;
0270 
0271     BUFFER_TRACE(is.iloc.bh, "get_write_access");
0272     error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
0273                           EXT4_JTR_NONE);
0274     if (error)
0275         goto out;
0276 
0277     if (len > EXT4_MIN_INLINE_DATA_SIZE) {
0278         value = EXT4_ZERO_XATTR_VALUE;
0279         len -= EXT4_MIN_INLINE_DATA_SIZE;
0280     } else {
0281         value = "";
0282         len = 0;
0283     }
0284 
0285     /* Insert the xttr entry. */
0286     i.value = value;
0287     i.value_len = len;
0288 
0289     error = ext4_xattr_ibody_find(inode, &i, &is);
0290     if (error)
0291         goto out;
0292 
0293     BUG_ON(!is.s.not_found);
0294 
0295     error = ext4_xattr_ibody_set(handle, inode, &i, &is);
0296     if (error) {
0297         if (error == -ENOSPC)
0298             ext4_clear_inode_state(inode,
0299                            EXT4_STATE_MAY_INLINE_DATA);
0300         goto out;
0301     }
0302 
0303     memset((void *)ext4_raw_inode(&is.iloc)->i_block,
0304         0, EXT4_MIN_INLINE_DATA_SIZE);
0305 
0306     EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
0307                       (void *)ext4_raw_inode(&is.iloc));
0308     EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
0309     ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
0310     ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
0311     get_bh(is.iloc.bh);
0312     error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
0313 
0314 out:
0315     brelse(is.iloc.bh);
0316     return error;
0317 }
0318 
0319 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
0320                    unsigned int len)
0321 {
0322     int error;
0323     void *value = NULL;
0324     struct ext4_xattr_ibody_find is = {
0325         .s = { .not_found = -ENODATA, },
0326     };
0327     struct ext4_xattr_info i = {
0328         .name_index = EXT4_XATTR_INDEX_SYSTEM,
0329         .name = EXT4_XATTR_SYSTEM_DATA,
0330     };
0331 
0332     /* If the old space is ok, write the data directly. */
0333     if (len <= EXT4_I(inode)->i_inline_size)
0334         return 0;
0335 
0336     error = ext4_get_inode_loc(inode, &is.iloc);
0337     if (error)
0338         return error;
0339 
0340     error = ext4_xattr_ibody_find(inode, &i, &is);
0341     if (error)
0342         goto out;
0343 
0344     BUG_ON(is.s.not_found);
0345 
0346     len -= EXT4_MIN_INLINE_DATA_SIZE;
0347     value = kzalloc(len, GFP_NOFS);
0348     if (!value) {
0349         error = -ENOMEM;
0350         goto out;
0351     }
0352 
0353     error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
0354                      value, len);
0355     if (error == -ENODATA)
0356         goto out;
0357 
0358     BUFFER_TRACE(is.iloc.bh, "get_write_access");
0359     error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
0360                           EXT4_JTR_NONE);
0361     if (error)
0362         goto out;
0363 
0364     /* Update the xattr entry. */
0365     i.value = value;
0366     i.value_len = len;
0367 
0368     error = ext4_xattr_ibody_set(handle, inode, &i, &is);
0369     if (error)
0370         goto out;
0371 
0372     EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
0373                       (void *)ext4_raw_inode(&is.iloc));
0374     EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
0375                 le32_to_cpu(is.s.here->e_value_size);
0376     ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
0377     get_bh(is.iloc.bh);
0378     error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
0379 
0380 out:
0381     kfree(value);
0382     brelse(is.iloc.bh);
0383     return error;
0384 }
0385 
0386 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
0387                     unsigned int len)
0388 {
0389     int ret, size, no_expand;
0390     struct ext4_inode_info *ei = EXT4_I(inode);
0391 
0392     if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
0393         return -ENOSPC;
0394 
0395     size = ext4_get_max_inline_size(inode);
0396     if (size < len)
0397         return -ENOSPC;
0398 
0399     ext4_write_lock_xattr(inode, &no_expand);
0400 
0401     if (ei->i_inline_off)
0402         ret = ext4_update_inline_data(handle, inode, len);
0403     else
0404         ret = ext4_create_inline_data(handle, inode, len);
0405 
0406     ext4_write_unlock_xattr(inode, &no_expand);
0407     return ret;
0408 }
0409 
0410 static int ext4_destroy_inline_data_nolock(handle_t *handle,
0411                        struct inode *inode)
0412 {
0413     struct ext4_inode_info *ei = EXT4_I(inode);
0414     struct ext4_xattr_ibody_find is = {
0415         .s = { .not_found = 0, },
0416     };
0417     struct ext4_xattr_info i = {
0418         .name_index = EXT4_XATTR_INDEX_SYSTEM,
0419         .name = EXT4_XATTR_SYSTEM_DATA,
0420         .value = NULL,
0421         .value_len = 0,
0422     };
0423     int error;
0424 
0425     if (!ei->i_inline_off)
0426         return 0;
0427 
0428     error = ext4_get_inode_loc(inode, &is.iloc);
0429     if (error)
0430         return error;
0431 
0432     error = ext4_xattr_ibody_find(inode, &i, &is);
0433     if (error)
0434         goto out;
0435 
0436     BUFFER_TRACE(is.iloc.bh, "get_write_access");
0437     error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
0438                           EXT4_JTR_NONE);
0439     if (error)
0440         goto out;
0441 
0442     error = ext4_xattr_ibody_set(handle, inode, &i, &is);
0443     if (error)
0444         goto out;
0445 
0446     memset((void *)ext4_raw_inode(&is.iloc)->i_block,
0447         0, EXT4_MIN_INLINE_DATA_SIZE);
0448     memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
0449 
0450     if (ext4_has_feature_extents(inode->i_sb)) {
0451         if (S_ISDIR(inode->i_mode) ||
0452             S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
0453             ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
0454             ext4_ext_tree_init(handle, inode);
0455         }
0456     }
0457     ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
0458 
0459     get_bh(is.iloc.bh);
0460     error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
0461 
0462     EXT4_I(inode)->i_inline_off = 0;
0463     EXT4_I(inode)->i_inline_size = 0;
0464     ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
0465 out:
0466     brelse(is.iloc.bh);
0467     if (error == -ENODATA)
0468         error = 0;
0469     return error;
0470 }
0471 
0472 static int ext4_read_inline_page(struct inode *inode, struct page *page)
0473 {
0474     void *kaddr;
0475     int ret = 0;
0476     size_t len;
0477     struct ext4_iloc iloc;
0478 
0479     BUG_ON(!PageLocked(page));
0480     BUG_ON(!ext4_has_inline_data(inode));
0481     BUG_ON(page->index);
0482 
0483     if (!EXT4_I(inode)->i_inline_off) {
0484         ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
0485                  inode->i_ino);
0486         goto out;
0487     }
0488 
0489     ret = ext4_get_inode_loc(inode, &iloc);
0490     if (ret)
0491         goto out;
0492 
0493     len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
0494     kaddr = kmap_atomic(page);
0495     ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
0496     flush_dcache_page(page);
0497     kunmap_atomic(kaddr);
0498     zero_user_segment(page, len, PAGE_SIZE);
0499     SetPageUptodate(page);
0500     brelse(iloc.bh);
0501 
0502 out:
0503     return ret;
0504 }
0505 
0506 int ext4_readpage_inline(struct inode *inode, struct page *page)
0507 {
0508     int ret = 0;
0509 
0510     down_read(&EXT4_I(inode)->xattr_sem);
0511     if (!ext4_has_inline_data(inode)) {
0512         up_read(&EXT4_I(inode)->xattr_sem);
0513         return -EAGAIN;
0514     }
0515 
0516     /*
0517      * Current inline data can only exist in the 1st page,
0518      * So for all the other pages, just set them uptodate.
0519      */
0520     if (!page->index)
0521         ret = ext4_read_inline_page(inode, page);
0522     else if (!PageUptodate(page)) {
0523         zero_user_segment(page, 0, PAGE_SIZE);
0524         SetPageUptodate(page);
0525     }
0526 
0527     up_read(&EXT4_I(inode)->xattr_sem);
0528 
0529     unlock_page(page);
0530     return ret >= 0 ? 0 : ret;
0531 }
0532 
0533 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
0534                           struct inode *inode)
0535 {
0536     int ret, needed_blocks, no_expand;
0537     handle_t *handle = NULL;
0538     int retries = 0, sem_held = 0;
0539     struct page *page = NULL;
0540     unsigned int flags;
0541     unsigned from, to;
0542     struct ext4_iloc iloc;
0543 
0544     if (!ext4_has_inline_data(inode)) {
0545         /*
0546          * clear the flag so that no new write
0547          * will trap here again.
0548          */
0549         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
0550         return 0;
0551     }
0552 
0553     needed_blocks = ext4_writepage_trans_blocks(inode);
0554 
0555     ret = ext4_get_inode_loc(inode, &iloc);
0556     if (ret)
0557         return ret;
0558 
0559 retry:
0560     handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
0561     if (IS_ERR(handle)) {
0562         ret = PTR_ERR(handle);
0563         handle = NULL;
0564         goto out;
0565     }
0566 
0567     /* We cannot recurse into the filesystem as the transaction is already
0568      * started */
0569     flags = memalloc_nofs_save();
0570     page = grab_cache_page_write_begin(mapping, 0);
0571     memalloc_nofs_restore(flags);
0572     if (!page) {
0573         ret = -ENOMEM;
0574         goto out;
0575     }
0576 
0577     ext4_write_lock_xattr(inode, &no_expand);
0578     sem_held = 1;
0579     /* If some one has already done this for us, just exit. */
0580     if (!ext4_has_inline_data(inode)) {
0581         ret = 0;
0582         goto out;
0583     }
0584 
0585     from = 0;
0586     to = ext4_get_inline_size(inode);
0587     if (!PageUptodate(page)) {
0588         ret = ext4_read_inline_page(inode, page);
0589         if (ret < 0)
0590             goto out;
0591     }
0592 
0593     ret = ext4_destroy_inline_data_nolock(handle, inode);
0594     if (ret)
0595         goto out;
0596 
0597     if (ext4_should_dioread_nolock(inode)) {
0598         ret = __block_write_begin(page, from, to,
0599                       ext4_get_block_unwritten);
0600     } else
0601         ret = __block_write_begin(page, from, to, ext4_get_block);
0602 
0603     if (!ret && ext4_should_journal_data(inode)) {
0604         ret = ext4_walk_page_buffers(handle, inode, page_buffers(page),
0605                          from, to, NULL,
0606                          do_journal_get_write_access);
0607     }
0608 
0609     if (ret) {
0610         unlock_page(page);
0611         put_page(page);
0612         page = NULL;
0613         ext4_orphan_add(handle, inode);
0614         ext4_write_unlock_xattr(inode, &no_expand);
0615         sem_held = 0;
0616         ext4_journal_stop(handle);
0617         handle = NULL;
0618         ext4_truncate_failed_write(inode);
0619         /*
0620          * If truncate failed early the inode might
0621          * still be on the orphan list; we need to
0622          * make sure the inode is removed from the
0623          * orphan list in that case.
0624          */
0625         if (inode->i_nlink)
0626             ext4_orphan_del(NULL, inode);
0627     }
0628 
0629     if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
0630         goto retry;
0631 
0632     if (page)
0633         block_commit_write(page, from, to);
0634 out:
0635     if (page) {
0636         unlock_page(page);
0637         put_page(page);
0638     }
0639     if (sem_held)
0640         ext4_write_unlock_xattr(inode, &no_expand);
0641     if (handle)
0642         ext4_journal_stop(handle);
0643     brelse(iloc.bh);
0644     return ret;
0645 }
0646 
0647 /*
0648  * Try to write data in the inode.
0649  * If the inode has inline data, check whether the new write can be
0650  * in the inode also. If not, create the page the handle, move the data
0651  * to the page make it update and let the later codes create extent for it.
0652  */
0653 int ext4_try_to_write_inline_data(struct address_space *mapping,
0654                   struct inode *inode,
0655                   loff_t pos, unsigned len,
0656                   struct page **pagep)
0657 {
0658     int ret;
0659     handle_t *handle;
0660     unsigned int flags;
0661     struct page *page;
0662     struct ext4_iloc iloc;
0663 
0664     if (pos + len > ext4_get_max_inline_size(inode))
0665         goto convert;
0666 
0667     ret = ext4_get_inode_loc(inode, &iloc);
0668     if (ret)
0669         return ret;
0670 
0671     /*
0672      * The possible write could happen in the inode,
0673      * so try to reserve the space in inode first.
0674      */
0675     handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
0676     if (IS_ERR(handle)) {
0677         ret = PTR_ERR(handle);
0678         handle = NULL;
0679         goto out;
0680     }
0681 
0682     ret = ext4_prepare_inline_data(handle, inode, pos + len);
0683     if (ret && ret != -ENOSPC)
0684         goto out;
0685 
0686     /* We don't have space in inline inode, so convert it to extent. */
0687     if (ret == -ENOSPC) {
0688         ext4_journal_stop(handle);
0689         brelse(iloc.bh);
0690         goto convert;
0691     }
0692 
0693     ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
0694                         EXT4_JTR_NONE);
0695     if (ret)
0696         goto out;
0697 
0698     flags = memalloc_nofs_save();
0699     page = grab_cache_page_write_begin(mapping, 0);
0700     memalloc_nofs_restore(flags);
0701     if (!page) {
0702         ret = -ENOMEM;
0703         goto out;
0704     }
0705 
0706     *pagep = page;
0707     down_read(&EXT4_I(inode)->xattr_sem);
0708     if (!ext4_has_inline_data(inode)) {
0709         ret = 0;
0710         unlock_page(page);
0711         put_page(page);
0712         goto out_up_read;
0713     }
0714 
0715     if (!PageUptodate(page)) {
0716         ret = ext4_read_inline_page(inode, page);
0717         if (ret < 0) {
0718             unlock_page(page);
0719             put_page(page);
0720             goto out_up_read;
0721         }
0722     }
0723 
0724     ret = 1;
0725     handle = NULL;
0726 out_up_read:
0727     up_read(&EXT4_I(inode)->xattr_sem);
0728 out:
0729     if (handle && (ret != 1))
0730         ext4_journal_stop(handle);
0731     brelse(iloc.bh);
0732     return ret;
0733 convert:
0734     return ext4_convert_inline_data_to_extent(mapping, inode);
0735 }
0736 
0737 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
0738                    unsigned copied, struct page *page)
0739 {
0740     handle_t *handle = ext4_journal_current_handle();
0741     int no_expand;
0742     void *kaddr;
0743     struct ext4_iloc iloc;
0744     int ret = 0, ret2;
0745 
0746     if (unlikely(copied < len) && !PageUptodate(page))
0747         copied = 0;
0748 
0749     if (likely(copied)) {
0750         ret = ext4_get_inode_loc(inode, &iloc);
0751         if (ret) {
0752             unlock_page(page);
0753             put_page(page);
0754             ext4_std_error(inode->i_sb, ret);
0755             goto out;
0756         }
0757         ext4_write_lock_xattr(inode, &no_expand);
0758         BUG_ON(!ext4_has_inline_data(inode));
0759 
0760         /*
0761          * ei->i_inline_off may have changed since
0762          * ext4_write_begin() called
0763          * ext4_try_to_write_inline_data()
0764          */
0765         (void) ext4_find_inline_data_nolock(inode);
0766 
0767         kaddr = kmap_atomic(page);
0768         ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
0769         kunmap_atomic(kaddr);
0770         SetPageUptodate(page);
0771         /* clear page dirty so that writepages wouldn't work for us. */
0772         ClearPageDirty(page);
0773 
0774         ext4_write_unlock_xattr(inode, &no_expand);
0775         brelse(iloc.bh);
0776 
0777         /*
0778          * It's important to update i_size while still holding page
0779          * lock: page writeout could otherwise come in and zero
0780          * beyond i_size.
0781          */
0782         ext4_update_inode_size(inode, pos + copied);
0783     }
0784     unlock_page(page);
0785     put_page(page);
0786 
0787     /*
0788      * Don't mark the inode dirty under page lock. First, it unnecessarily
0789      * makes the holding time of page lock longer. Second, it forces lock
0790      * ordering of page lock and transaction start for journaling
0791      * filesystems.
0792      */
0793     if (likely(copied))
0794         mark_inode_dirty(inode);
0795 out:
0796     /*
0797      * If we didn't copy as much data as expected, we need to trim back
0798      * size of xattr containing inline data.
0799      */
0800     if (pos + len > inode->i_size && ext4_can_truncate(inode))
0801         ext4_orphan_add(handle, inode);
0802 
0803     ret2 = ext4_journal_stop(handle);
0804     if (!ret)
0805         ret = ret2;
0806     if (pos + len > inode->i_size) {
0807         ext4_truncate_failed_write(inode);
0808         /*
0809          * If truncate failed early the inode might still be
0810          * on the orphan list; we need to make sure the inode
0811          * is removed from the orphan list in that case.
0812          */
0813         if (inode->i_nlink)
0814             ext4_orphan_del(NULL, inode);
0815     }
0816     return ret ? ret : copied;
0817 }
0818 
0819 struct buffer_head *
0820 ext4_journalled_write_inline_data(struct inode *inode,
0821                   unsigned len,
0822                   struct page *page)
0823 {
0824     int ret, no_expand;
0825     void *kaddr;
0826     struct ext4_iloc iloc;
0827 
0828     ret = ext4_get_inode_loc(inode, &iloc);
0829     if (ret) {
0830         ext4_std_error(inode->i_sb, ret);
0831         return NULL;
0832     }
0833 
0834     ext4_write_lock_xattr(inode, &no_expand);
0835     kaddr = kmap_atomic(page);
0836     ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
0837     kunmap_atomic(kaddr);
0838     ext4_write_unlock_xattr(inode, &no_expand);
0839 
0840     return iloc.bh;
0841 }
0842 
0843 /*
0844  * Try to make the page cache and handle ready for the inline data case.
0845  * We can call this function in 2 cases:
0846  * 1. The inode is created and the first write exceeds inline size. We can
0847  *    clear the inode state safely.
0848  * 2. The inode has inline data, then we need to read the data, make it
0849  *    update and dirty so that ext4_da_writepages can handle it. We don't
0850  *    need to start the journal since the file's metadata isn't changed now.
0851  */
0852 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
0853                          struct inode *inode,
0854                          void **fsdata)
0855 {
0856     int ret = 0, inline_size;
0857     struct page *page;
0858 
0859     page = grab_cache_page_write_begin(mapping, 0);
0860     if (!page)
0861         return -ENOMEM;
0862 
0863     down_read(&EXT4_I(inode)->xattr_sem);
0864     if (!ext4_has_inline_data(inode)) {
0865         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
0866         goto out;
0867     }
0868 
0869     inline_size = ext4_get_inline_size(inode);
0870 
0871     if (!PageUptodate(page)) {
0872         ret = ext4_read_inline_page(inode, page);
0873         if (ret < 0)
0874             goto out;
0875     }
0876 
0877     ret = __block_write_begin(page, 0, inline_size,
0878                   ext4_da_get_block_prep);
0879     if (ret) {
0880         up_read(&EXT4_I(inode)->xattr_sem);
0881         unlock_page(page);
0882         put_page(page);
0883         ext4_truncate_failed_write(inode);
0884         return ret;
0885     }
0886 
0887     SetPageDirty(page);
0888     SetPageUptodate(page);
0889     ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
0890     *fsdata = (void *)CONVERT_INLINE_DATA;
0891 
0892 out:
0893     up_read(&EXT4_I(inode)->xattr_sem);
0894     if (page) {
0895         unlock_page(page);
0896         put_page(page);
0897     }
0898     return ret;
0899 }
0900 
0901 /*
0902  * Prepare the write for the inline data.
0903  * If the data can be written into the inode, we just read
0904  * the page and make it uptodate, and start the journal.
0905  * Otherwise read the page, makes it dirty so that it can be
0906  * handle in writepages(the i_disksize update is left to the
0907  * normal ext4_da_write_end).
0908  */
0909 int ext4_da_write_inline_data_begin(struct address_space *mapping,
0910                     struct inode *inode,
0911                     loff_t pos, unsigned len,
0912                     struct page **pagep,
0913                     void **fsdata)
0914 {
0915     int ret;
0916     handle_t *handle;
0917     struct page *page;
0918     struct ext4_iloc iloc;
0919     int retries = 0;
0920     unsigned int flags;
0921 
0922     ret = ext4_get_inode_loc(inode, &iloc);
0923     if (ret)
0924         return ret;
0925 
0926 retry_journal:
0927     handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
0928     if (IS_ERR(handle)) {
0929         ret = PTR_ERR(handle);
0930         goto out;
0931     }
0932 
0933     ret = ext4_prepare_inline_data(handle, inode, pos + len);
0934     if (ret && ret != -ENOSPC)
0935         goto out_journal;
0936 
0937     if (ret == -ENOSPC) {
0938         ext4_journal_stop(handle);
0939         ret = ext4_da_convert_inline_data_to_extent(mapping,
0940                                 inode,
0941                                 fsdata);
0942         if (ret == -ENOSPC &&
0943             ext4_should_retry_alloc(inode->i_sb, &retries))
0944             goto retry_journal;
0945         goto out;
0946     }
0947 
0948     /*
0949      * We cannot recurse into the filesystem as the transaction
0950      * is already started.
0951      */
0952     flags = memalloc_nofs_save();
0953     page = grab_cache_page_write_begin(mapping, 0);
0954     memalloc_nofs_restore(flags);
0955     if (!page) {
0956         ret = -ENOMEM;
0957         goto out_journal;
0958     }
0959 
0960     down_read(&EXT4_I(inode)->xattr_sem);
0961     if (!ext4_has_inline_data(inode)) {
0962         ret = 0;
0963         goto out_release_page;
0964     }
0965 
0966     if (!PageUptodate(page)) {
0967         ret = ext4_read_inline_page(inode, page);
0968         if (ret < 0)
0969             goto out_release_page;
0970     }
0971     ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
0972                         EXT4_JTR_NONE);
0973     if (ret)
0974         goto out_release_page;
0975 
0976     up_read(&EXT4_I(inode)->xattr_sem);
0977     *pagep = page;
0978     brelse(iloc.bh);
0979     return 1;
0980 out_release_page:
0981     up_read(&EXT4_I(inode)->xattr_sem);
0982     unlock_page(page);
0983     put_page(page);
0984 out_journal:
0985     ext4_journal_stop(handle);
0986 out:
0987     brelse(iloc.bh);
0988     return ret;
0989 }
0990 
0991 #ifdef INLINE_DIR_DEBUG
0992 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
0993               void *inline_start, int inline_size)
0994 {
0995     int offset;
0996     unsigned short de_len;
0997     struct ext4_dir_entry_2 *de = inline_start;
0998     void *dlimit = inline_start + inline_size;
0999 
1000     trace_printk("inode %lu\n", dir->i_ino);
1001     offset = 0;
1002     while ((void *)de < dlimit) {
1003         de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1004         trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1005                  offset, de_len, de->name_len, de->name,
1006                  de->name_len, le32_to_cpu(de->inode));
1007         if (ext4_check_dir_entry(dir, NULL, de, bh,
1008                      inline_start, inline_size, offset))
1009             BUG();
1010 
1011         offset += de_len;
1012         de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1013     }
1014 }
1015 #else
1016 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1017 #endif
1018 
1019 /*
1020  * Add a new entry into a inline dir.
1021  * It will return -ENOSPC if no space is available, and -EIO
1022  * and -EEXIST if directory entry already exists.
1023  */
1024 static int ext4_add_dirent_to_inline(handle_t *handle,
1025                      struct ext4_filename *fname,
1026                      struct inode *dir,
1027                      struct inode *inode,
1028                      struct ext4_iloc *iloc,
1029                      void *inline_start, int inline_size)
1030 {
1031     int     err;
1032     struct ext4_dir_entry_2 *de;
1033 
1034     err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1035                 inline_size, fname, &de);
1036     if (err)
1037         return err;
1038 
1039     BUFFER_TRACE(iloc->bh, "get_write_access");
1040     err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1041                         EXT4_JTR_NONE);
1042     if (err)
1043         return err;
1044     ext4_insert_dentry(dir, inode, de, inline_size, fname);
1045 
1046     ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1047 
1048     /*
1049      * XXX shouldn't update any times until successful
1050      * completion of syscall, but too many callers depend
1051      * on this.
1052      *
1053      * XXX similarly, too many callers depend on
1054      * ext4_new_inode() setting the times, but error
1055      * recovery deletes the inode, so the worst that can
1056      * happen is that the times are slightly out of date
1057      * and/or different from the directory change time.
1058      */
1059     dir->i_mtime = dir->i_ctime = current_time(dir);
1060     ext4_update_dx_flag(dir);
1061     inode_inc_iversion(dir);
1062     return 1;
1063 }
1064 
1065 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1066                        struct ext4_iloc *iloc)
1067 {
1068     struct ext4_xattr_entry *entry;
1069     struct ext4_xattr_ibody_header *header;
1070 
1071     BUG_ON(!EXT4_I(inode)->i_inline_off);
1072 
1073     header = IHDR(inode, ext4_raw_inode(iloc));
1074     entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1075                         EXT4_I(inode)->i_inline_off);
1076 
1077     return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1078 }
1079 
1080 /* Set the final de to cover the whole block. */
1081 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1082 {
1083     struct ext4_dir_entry_2 *de, *prev_de;
1084     void *limit;
1085     int de_len;
1086 
1087     de = de_buf;
1088     if (old_size) {
1089         limit = de_buf + old_size;
1090         do {
1091             prev_de = de;
1092             de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1093             de_buf += de_len;
1094             de = de_buf;
1095         } while (de_buf < limit);
1096 
1097         prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1098                             old_size, new_size);
1099     } else {
1100         /* this is just created, so create an empty entry. */
1101         de->inode = 0;
1102         de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1103     }
1104 }
1105 
1106 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1107                   struct ext4_iloc *iloc)
1108 {
1109     int ret;
1110     int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1111     int new_size = get_max_inline_xattr_value_size(dir, iloc);
1112 
1113     if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1114         return -ENOSPC;
1115 
1116     ret = ext4_update_inline_data(handle, dir,
1117                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1118     if (ret)
1119         return ret;
1120 
1121     ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1122                  EXT4_I(dir)->i_inline_size -
1123                         EXT4_MIN_INLINE_DATA_SIZE);
1124     dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1125     return 0;
1126 }
1127 
1128 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1129                      struct ext4_iloc *iloc,
1130                      void *buf, int inline_size)
1131 {
1132     int ret;
1133 
1134     ret = ext4_create_inline_data(handle, inode, inline_size);
1135     if (ret) {
1136         ext4_msg(inode->i_sb, KERN_EMERG,
1137             "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1138             inode->i_ino, ret);
1139         return;
1140     }
1141     ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1142     ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1143 }
1144 
1145 static int ext4_finish_convert_inline_dir(handle_t *handle,
1146                       struct inode *inode,
1147                       struct buffer_head *dir_block,
1148                       void *buf,
1149                       int inline_size)
1150 {
1151     int err, csum_size = 0, header_size = 0;
1152     struct ext4_dir_entry_2 *de;
1153     void *target = dir_block->b_data;
1154 
1155     /*
1156      * First create "." and ".." and then copy the dir information
1157      * back to the block.
1158      */
1159     de = target;
1160     de = ext4_init_dot_dotdot(inode, de,
1161         inode->i_sb->s_blocksize, csum_size,
1162         le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1163     header_size = (void *)de - target;
1164 
1165     memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1166         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1167 
1168     if (ext4_has_metadata_csum(inode->i_sb))
1169         csum_size = sizeof(struct ext4_dir_entry_tail);
1170 
1171     inode->i_size = inode->i_sb->s_blocksize;
1172     i_size_write(inode, inode->i_sb->s_blocksize);
1173     EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1174     ext4_update_final_de(dir_block->b_data,
1175             inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1176             inode->i_sb->s_blocksize - csum_size);
1177 
1178     if (csum_size)
1179         ext4_initialize_dirent_tail(dir_block,
1180                         inode->i_sb->s_blocksize);
1181     set_buffer_uptodate(dir_block);
1182     err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1183     if (err)
1184         return err;
1185     set_buffer_verified(dir_block);
1186     return ext4_mark_inode_dirty(handle, inode);
1187 }
1188 
1189 static int ext4_convert_inline_data_nolock(handle_t *handle,
1190                        struct inode *inode,
1191                        struct ext4_iloc *iloc)
1192 {
1193     int error;
1194     void *buf = NULL;
1195     struct buffer_head *data_bh = NULL;
1196     struct ext4_map_blocks map;
1197     int inline_size;
1198 
1199     inline_size = ext4_get_inline_size(inode);
1200     buf = kmalloc(inline_size, GFP_NOFS);
1201     if (!buf) {
1202         error = -ENOMEM;
1203         goto out;
1204     }
1205 
1206     error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1207     if (error < 0)
1208         goto out;
1209 
1210     /*
1211      * Make sure the inline directory entries pass checks before we try to
1212      * convert them, so that we avoid touching stuff that needs fsck.
1213      */
1214     if (S_ISDIR(inode->i_mode)) {
1215         error = ext4_check_all_de(inode, iloc->bh,
1216                     buf + EXT4_INLINE_DOTDOT_SIZE,
1217                     inline_size - EXT4_INLINE_DOTDOT_SIZE);
1218         if (error)
1219             goto out;
1220     }
1221 
1222     error = ext4_destroy_inline_data_nolock(handle, inode);
1223     if (error)
1224         goto out;
1225 
1226     map.m_lblk = 0;
1227     map.m_len = 1;
1228     map.m_flags = 0;
1229     error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1230     if (error < 0)
1231         goto out_restore;
1232     if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1233         error = -EIO;
1234         goto out_restore;
1235     }
1236 
1237     data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1238     if (!data_bh) {
1239         error = -ENOMEM;
1240         goto out_restore;
1241     }
1242 
1243     lock_buffer(data_bh);
1244     error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1245                            EXT4_JTR_NONE);
1246     if (error) {
1247         unlock_buffer(data_bh);
1248         error = -EIO;
1249         goto out_restore;
1250     }
1251     memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1252 
1253     if (!S_ISDIR(inode->i_mode)) {
1254         memcpy(data_bh->b_data, buf, inline_size);
1255         set_buffer_uptodate(data_bh);
1256         error = ext4_handle_dirty_metadata(handle,
1257                            inode, data_bh);
1258     } else {
1259         error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1260                                buf, inline_size);
1261     }
1262 
1263     unlock_buffer(data_bh);
1264 out_restore:
1265     if (error)
1266         ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1267 
1268 out:
1269     brelse(data_bh);
1270     kfree(buf);
1271     return error;
1272 }
1273 
1274 /*
1275  * Try to add the new entry to the inline data.
1276  * If succeeds, return 0. If not, extended the inline dir and copied data to
1277  * the new created block.
1278  */
1279 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1280                   struct inode *dir, struct inode *inode)
1281 {
1282     int ret, ret2, inline_size, no_expand;
1283     void *inline_start;
1284     struct ext4_iloc iloc;
1285 
1286     ret = ext4_get_inode_loc(dir, &iloc);
1287     if (ret)
1288         return ret;
1289 
1290     ext4_write_lock_xattr(dir, &no_expand);
1291     if (!ext4_has_inline_data(dir))
1292         goto out;
1293 
1294     inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1295                          EXT4_INLINE_DOTDOT_SIZE;
1296     inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1297 
1298     ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1299                     inline_start, inline_size);
1300     if (ret != -ENOSPC)
1301         goto out;
1302 
1303     /* check whether it can be inserted to inline xattr space. */
1304     inline_size = EXT4_I(dir)->i_inline_size -
1305             EXT4_MIN_INLINE_DATA_SIZE;
1306     if (!inline_size) {
1307         /* Try to use the xattr space.*/
1308         ret = ext4_update_inline_dir(handle, dir, &iloc);
1309         if (ret && ret != -ENOSPC)
1310             goto out;
1311 
1312         inline_size = EXT4_I(dir)->i_inline_size -
1313                 EXT4_MIN_INLINE_DATA_SIZE;
1314     }
1315 
1316     if (inline_size) {
1317         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1318 
1319         ret = ext4_add_dirent_to_inline(handle, fname, dir,
1320                         inode, &iloc, inline_start,
1321                         inline_size);
1322 
1323         if (ret != -ENOSPC)
1324             goto out;
1325     }
1326 
1327     /*
1328      * The inline space is filled up, so create a new block for it.
1329      * As the extent tree will be created, we have to save the inline
1330      * dir first.
1331      */
1332     ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1333 
1334 out:
1335     ext4_write_unlock_xattr(dir, &no_expand);
1336     ret2 = ext4_mark_inode_dirty(handle, dir);
1337     if (unlikely(ret2 && !ret))
1338         ret = ret2;
1339     brelse(iloc.bh);
1340     return ret;
1341 }
1342 
1343 /*
1344  * This function fills a red-black tree with information from an
1345  * inlined dir.  It returns the number directory entries loaded
1346  * into the tree.  If there is an error it is returned in err.
1347  */
1348 int ext4_inlinedir_to_tree(struct file *dir_file,
1349                struct inode *dir, ext4_lblk_t block,
1350                struct dx_hash_info *hinfo,
1351                __u32 start_hash, __u32 start_minor_hash,
1352                int *has_inline_data)
1353 {
1354     int err = 0, count = 0;
1355     unsigned int parent_ino;
1356     int pos;
1357     struct ext4_dir_entry_2 *de;
1358     struct inode *inode = file_inode(dir_file);
1359     int ret, inline_size = 0;
1360     struct ext4_iloc iloc;
1361     void *dir_buf = NULL;
1362     struct ext4_dir_entry_2 fake;
1363     struct fscrypt_str tmp_str;
1364 
1365     ret = ext4_get_inode_loc(inode, &iloc);
1366     if (ret)
1367         return ret;
1368 
1369     down_read(&EXT4_I(inode)->xattr_sem);
1370     if (!ext4_has_inline_data(inode)) {
1371         up_read(&EXT4_I(inode)->xattr_sem);
1372         *has_inline_data = 0;
1373         goto out;
1374     }
1375 
1376     inline_size = ext4_get_inline_size(inode);
1377     dir_buf = kmalloc(inline_size, GFP_NOFS);
1378     if (!dir_buf) {
1379         ret = -ENOMEM;
1380         up_read(&EXT4_I(inode)->xattr_sem);
1381         goto out;
1382     }
1383 
1384     ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1385     up_read(&EXT4_I(inode)->xattr_sem);
1386     if (ret < 0)
1387         goto out;
1388 
1389     pos = 0;
1390     parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1391     while (pos < inline_size) {
1392         /*
1393          * As inlined dir doesn't store any information about '.' and
1394          * only the inode number of '..' is stored, we have to handle
1395          * them differently.
1396          */
1397         if (pos == 0) {
1398             fake.inode = cpu_to_le32(inode->i_ino);
1399             fake.name_len = 1;
1400             strcpy(fake.name, ".");
1401             fake.rec_len = ext4_rec_len_to_disk(
1402                       ext4_dir_rec_len(fake.name_len, NULL),
1403                       inline_size);
1404             ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1405             de = &fake;
1406             pos = EXT4_INLINE_DOTDOT_OFFSET;
1407         } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1408             fake.inode = cpu_to_le32(parent_ino);
1409             fake.name_len = 2;
1410             strcpy(fake.name, "..");
1411             fake.rec_len = ext4_rec_len_to_disk(
1412                       ext4_dir_rec_len(fake.name_len, NULL),
1413                       inline_size);
1414             ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1415             de = &fake;
1416             pos = EXT4_INLINE_DOTDOT_SIZE;
1417         } else {
1418             de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1419             pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1420             if (ext4_check_dir_entry(inode, dir_file, de,
1421                      iloc.bh, dir_buf,
1422                      inline_size, pos)) {
1423                 ret = count;
1424                 goto out;
1425             }
1426         }
1427 
1428         if (ext4_hash_in_dirent(dir)) {
1429             hinfo->hash = EXT4_DIRENT_HASH(de);
1430             hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1431         } else {
1432             ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1433         }
1434         if ((hinfo->hash < start_hash) ||
1435             ((hinfo->hash == start_hash) &&
1436              (hinfo->minor_hash < start_minor_hash)))
1437             continue;
1438         if (de->inode == 0)
1439             continue;
1440         tmp_str.name = de->name;
1441         tmp_str.len = de->name_len;
1442         err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1443                           hinfo->minor_hash, de, &tmp_str);
1444         if (err) {
1445             ret = err;
1446             goto out;
1447         }
1448         count++;
1449     }
1450     ret = count;
1451 out:
1452     kfree(dir_buf);
1453     brelse(iloc.bh);
1454     return ret;
1455 }
1456 
1457 /*
1458  * So this function is called when the volume is mkfsed with
1459  * dir_index disabled. In order to keep f_pos persistent
1460  * after we convert from an inlined dir to a blocked based,
1461  * we just pretend that we are a normal dir and return the
1462  * offset as if '.' and '..' really take place.
1463  *
1464  */
1465 int ext4_read_inline_dir(struct file *file,
1466              struct dir_context *ctx,
1467              int *has_inline_data)
1468 {
1469     unsigned int offset, parent_ino;
1470     int i;
1471     struct ext4_dir_entry_2 *de;
1472     struct super_block *sb;
1473     struct inode *inode = file_inode(file);
1474     int ret, inline_size = 0;
1475     struct ext4_iloc iloc;
1476     void *dir_buf = NULL;
1477     int dotdot_offset, dotdot_size, extra_offset, extra_size;
1478 
1479     ret = ext4_get_inode_loc(inode, &iloc);
1480     if (ret)
1481         return ret;
1482 
1483     down_read(&EXT4_I(inode)->xattr_sem);
1484     if (!ext4_has_inline_data(inode)) {
1485         up_read(&EXT4_I(inode)->xattr_sem);
1486         *has_inline_data = 0;
1487         goto out;
1488     }
1489 
1490     inline_size = ext4_get_inline_size(inode);
1491     dir_buf = kmalloc(inline_size, GFP_NOFS);
1492     if (!dir_buf) {
1493         ret = -ENOMEM;
1494         up_read(&EXT4_I(inode)->xattr_sem);
1495         goto out;
1496     }
1497 
1498     ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1499     up_read(&EXT4_I(inode)->xattr_sem);
1500     if (ret < 0)
1501         goto out;
1502 
1503     ret = 0;
1504     sb = inode->i_sb;
1505     parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1506     offset = ctx->pos;
1507 
1508     /*
1509      * dotdot_offset and dotdot_size is the real offset and
1510      * size for ".." and "." if the dir is block based while
1511      * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1512      * So we will use extra_offset and extra_size to indicate them
1513      * during the inline dir iteration.
1514      */
1515     dotdot_offset = ext4_dir_rec_len(1, NULL);
1516     dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1517     extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1518     extra_size = extra_offset + inline_size;
1519 
1520     /*
1521      * If the version has changed since the last call to
1522      * readdir(2), then we might be pointing to an invalid
1523      * dirent right now.  Scan from the start of the inline
1524      * dir to make sure.
1525      */
1526     if (!inode_eq_iversion(inode, file->f_version)) {
1527         for (i = 0; i < extra_size && i < offset;) {
1528             /*
1529              * "." is with offset 0 and
1530              * ".." is dotdot_offset.
1531              */
1532             if (!i) {
1533                 i = dotdot_offset;
1534                 continue;
1535             } else if (i == dotdot_offset) {
1536                 i = dotdot_size;
1537                 continue;
1538             }
1539             /* for other entry, the real offset in
1540              * the buf has to be tuned accordingly.
1541              */
1542             de = (struct ext4_dir_entry_2 *)
1543                 (dir_buf + i - extra_offset);
1544             /* It's too expensive to do a full
1545              * dirent test each time round this
1546              * loop, but we do have to test at
1547              * least that it is non-zero.  A
1548              * failure will be detected in the
1549              * dirent test below. */
1550             if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1551                 < ext4_dir_rec_len(1, NULL))
1552                 break;
1553             i += ext4_rec_len_from_disk(de->rec_len,
1554                             extra_size);
1555         }
1556         offset = i;
1557         ctx->pos = offset;
1558         file->f_version = inode_query_iversion(inode);
1559     }
1560 
1561     while (ctx->pos < extra_size) {
1562         if (ctx->pos == 0) {
1563             if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1564                 goto out;
1565             ctx->pos = dotdot_offset;
1566             continue;
1567         }
1568 
1569         if (ctx->pos == dotdot_offset) {
1570             if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1571                 goto out;
1572             ctx->pos = dotdot_size;
1573             continue;
1574         }
1575 
1576         de = (struct ext4_dir_entry_2 *)
1577             (dir_buf + ctx->pos - extra_offset);
1578         if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1579                      extra_size, ctx->pos))
1580             goto out;
1581         if (le32_to_cpu(de->inode)) {
1582             if (!dir_emit(ctx, de->name, de->name_len,
1583                       le32_to_cpu(de->inode),
1584                       get_dtype(sb, de->file_type)))
1585                 goto out;
1586         }
1587         ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1588     }
1589 out:
1590     kfree(dir_buf);
1591     brelse(iloc.bh);
1592     return ret;
1593 }
1594 
1595 void *ext4_read_inline_link(struct inode *inode)
1596 {
1597     struct ext4_iloc iloc;
1598     int ret, inline_size;
1599     void *link;
1600 
1601     ret = ext4_get_inode_loc(inode, &iloc);
1602     if (ret)
1603         return ERR_PTR(ret);
1604 
1605     ret = -ENOMEM;
1606     inline_size = ext4_get_inline_size(inode);
1607     link = kmalloc(inline_size + 1, GFP_NOFS);
1608     if (!link)
1609         goto out;
1610 
1611     ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1612     if (ret < 0) {
1613         kfree(link);
1614         goto out;
1615     }
1616     nd_terminate_link(link, inode->i_size, ret);
1617 out:
1618     if (ret < 0)
1619         link = ERR_PTR(ret);
1620     brelse(iloc.bh);
1621     return link;
1622 }
1623 
1624 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1625                     struct ext4_dir_entry_2 **parent_de,
1626                     int *retval)
1627 {
1628     struct ext4_iloc iloc;
1629 
1630     *retval = ext4_get_inode_loc(inode, &iloc);
1631     if (*retval)
1632         return NULL;
1633 
1634     *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1635 
1636     return iloc.bh;
1637 }
1638 
1639 /*
1640  * Try to create the inline data for the new dir.
1641  * If it succeeds, return 0, otherwise return the error.
1642  * In case of ENOSPC, the caller should create the normal disk layout dir.
1643  */
1644 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1645                    struct inode *inode)
1646 {
1647     int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1648     struct ext4_iloc iloc;
1649     struct ext4_dir_entry_2 *de;
1650 
1651     ret = ext4_get_inode_loc(inode, &iloc);
1652     if (ret)
1653         return ret;
1654 
1655     ret = ext4_prepare_inline_data(handle, inode, inline_size);
1656     if (ret)
1657         goto out;
1658 
1659     /*
1660      * For inline dir, we only save the inode information for the ".."
1661      * and create a fake dentry to cover the left space.
1662      */
1663     de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1664     de->inode = cpu_to_le32(parent->i_ino);
1665     de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1666     de->inode = 0;
1667     de->rec_len = ext4_rec_len_to_disk(
1668                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1669                 inline_size);
1670     set_nlink(inode, 2);
1671     inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1672 out:
1673     brelse(iloc.bh);
1674     return ret;
1675 }
1676 
1677 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1678                     struct ext4_filename *fname,
1679                     struct ext4_dir_entry_2 **res_dir,
1680                     int *has_inline_data)
1681 {
1682     int ret;
1683     struct ext4_iloc iloc;
1684     void *inline_start;
1685     int inline_size;
1686 
1687     if (ext4_get_inode_loc(dir, &iloc))
1688         return NULL;
1689 
1690     down_read(&EXT4_I(dir)->xattr_sem);
1691     if (!ext4_has_inline_data(dir)) {
1692         *has_inline_data = 0;
1693         goto out;
1694     }
1695 
1696     inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1697                         EXT4_INLINE_DOTDOT_SIZE;
1698     inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1699     ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1700                   dir, fname, 0, res_dir);
1701     if (ret == 1)
1702         goto out_find;
1703     if (ret < 0)
1704         goto out;
1705 
1706     if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1707         goto out;
1708 
1709     inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1710     inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1711 
1712     ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1713                   dir, fname, 0, res_dir);
1714     if (ret == 1)
1715         goto out_find;
1716 
1717 out:
1718     brelse(iloc.bh);
1719     iloc.bh = NULL;
1720 out_find:
1721     up_read(&EXT4_I(dir)->xattr_sem);
1722     return iloc.bh;
1723 }
1724 
1725 int ext4_delete_inline_entry(handle_t *handle,
1726                  struct inode *dir,
1727                  struct ext4_dir_entry_2 *de_del,
1728                  struct buffer_head *bh,
1729                  int *has_inline_data)
1730 {
1731     int err, inline_size, no_expand;
1732     struct ext4_iloc iloc;
1733     void *inline_start;
1734 
1735     err = ext4_get_inode_loc(dir, &iloc);
1736     if (err)
1737         return err;
1738 
1739     ext4_write_lock_xattr(dir, &no_expand);
1740     if (!ext4_has_inline_data(dir)) {
1741         *has_inline_data = 0;
1742         goto out;
1743     }
1744 
1745     if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1746         EXT4_MIN_INLINE_DATA_SIZE) {
1747         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1748                     EXT4_INLINE_DOTDOT_SIZE;
1749         inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1750                 EXT4_INLINE_DOTDOT_SIZE;
1751     } else {
1752         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1753         inline_size = ext4_get_inline_size(dir) -
1754                 EXT4_MIN_INLINE_DATA_SIZE;
1755     }
1756 
1757     BUFFER_TRACE(bh, "get_write_access");
1758     err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1759                         EXT4_JTR_NONE);
1760     if (err)
1761         goto out;
1762 
1763     err = ext4_generic_delete_entry(dir, de_del, bh,
1764                     inline_start, inline_size, 0);
1765     if (err)
1766         goto out;
1767 
1768     ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1769 out:
1770     ext4_write_unlock_xattr(dir, &no_expand);
1771     if (likely(err == 0))
1772         err = ext4_mark_inode_dirty(handle, dir);
1773     brelse(iloc.bh);
1774     if (err != -ENOENT)
1775         ext4_std_error(dir->i_sb, err);
1776     return err;
1777 }
1778 
1779 /*
1780  * Get the inline dentry at offset.
1781  */
1782 static inline struct ext4_dir_entry_2 *
1783 ext4_get_inline_entry(struct inode *inode,
1784               struct ext4_iloc *iloc,
1785               unsigned int offset,
1786               void **inline_start,
1787               int *inline_size)
1788 {
1789     void *inline_pos;
1790 
1791     BUG_ON(offset > ext4_get_inline_size(inode));
1792 
1793     if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1794         inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1795         *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1796     } else {
1797         inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1798         offset -= EXT4_MIN_INLINE_DATA_SIZE;
1799         *inline_size = ext4_get_inline_size(inode) -
1800                 EXT4_MIN_INLINE_DATA_SIZE;
1801     }
1802 
1803     if (inline_start)
1804         *inline_start = inline_pos;
1805     return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1806 }
1807 
1808 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1809 {
1810     int err, inline_size;
1811     struct ext4_iloc iloc;
1812     size_t inline_len;
1813     void *inline_pos;
1814     unsigned int offset;
1815     struct ext4_dir_entry_2 *de;
1816     bool ret = false;
1817 
1818     err = ext4_get_inode_loc(dir, &iloc);
1819     if (err) {
1820         EXT4_ERROR_INODE_ERR(dir, -err,
1821                      "error %d getting inode %lu block",
1822                      err, dir->i_ino);
1823         return false;
1824     }
1825 
1826     down_read(&EXT4_I(dir)->xattr_sem);
1827     if (!ext4_has_inline_data(dir)) {
1828         *has_inline_data = 0;
1829         ret = true;
1830         goto out;
1831     }
1832 
1833     de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1834     if (!le32_to_cpu(de->inode)) {
1835         ext4_warning(dir->i_sb,
1836                  "bad inline directory (dir #%lu) - no `..'",
1837                  dir->i_ino);
1838         goto out;
1839     }
1840 
1841     inline_len = ext4_get_inline_size(dir);
1842     offset = EXT4_INLINE_DOTDOT_SIZE;
1843     while (offset < inline_len) {
1844         de = ext4_get_inline_entry(dir, &iloc, offset,
1845                        &inline_pos, &inline_size);
1846         if (ext4_check_dir_entry(dir, NULL, de,
1847                      iloc.bh, inline_pos,
1848                      inline_size, offset)) {
1849             ext4_warning(dir->i_sb,
1850                      "bad inline directory (dir #%lu) - "
1851                      "inode %u, rec_len %u, name_len %d"
1852                      "inline size %d",
1853                      dir->i_ino, le32_to_cpu(de->inode),
1854                      le16_to_cpu(de->rec_len), de->name_len,
1855                      inline_size);
1856             goto out;
1857         }
1858         if (le32_to_cpu(de->inode)) {
1859             goto out;
1860         }
1861         offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1862     }
1863 
1864     ret = true;
1865 out:
1866     up_read(&EXT4_I(dir)->xattr_sem);
1867     brelse(iloc.bh);
1868     return ret;
1869 }
1870 
1871 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1872 {
1873     int ret, no_expand;
1874 
1875     ext4_write_lock_xattr(inode, &no_expand);
1876     ret = ext4_destroy_inline_data_nolock(handle, inode);
1877     ext4_write_unlock_xattr(inode, &no_expand);
1878 
1879     return ret;
1880 }
1881 
1882 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1883 {
1884     __u64 addr;
1885     int error = -EAGAIN;
1886     struct ext4_iloc iloc;
1887 
1888     down_read(&EXT4_I(inode)->xattr_sem);
1889     if (!ext4_has_inline_data(inode))
1890         goto out;
1891 
1892     error = ext4_get_inode_loc(inode, &iloc);
1893     if (error)
1894         goto out;
1895 
1896     addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1897     addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1898     addr += offsetof(struct ext4_inode, i_block);
1899 
1900     brelse(iloc.bh);
1901 
1902     iomap->addr = addr;
1903     iomap->offset = 0;
1904     iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1905                   i_size_read(inode));
1906     iomap->type = IOMAP_INLINE;
1907     iomap->flags = 0;
1908 
1909 out:
1910     up_read(&EXT4_I(inode)->xattr_sem);
1911     return error;
1912 }
1913 
1914 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1915 {
1916     handle_t *handle;
1917     int inline_size, value_len, needed_blocks, no_expand, err = 0;
1918     size_t i_size;
1919     void *value = NULL;
1920     struct ext4_xattr_ibody_find is = {
1921         .s = { .not_found = -ENODATA, },
1922     };
1923     struct ext4_xattr_info i = {
1924         .name_index = EXT4_XATTR_INDEX_SYSTEM,
1925         .name = EXT4_XATTR_SYSTEM_DATA,
1926     };
1927 
1928 
1929     needed_blocks = ext4_writepage_trans_blocks(inode);
1930     handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1931     if (IS_ERR(handle))
1932         return PTR_ERR(handle);
1933 
1934     ext4_write_lock_xattr(inode, &no_expand);
1935     if (!ext4_has_inline_data(inode)) {
1936         ext4_write_unlock_xattr(inode, &no_expand);
1937         *has_inline = 0;
1938         ext4_journal_stop(handle);
1939         return 0;
1940     }
1941 
1942     if ((err = ext4_orphan_add(handle, inode)) != 0)
1943         goto out;
1944 
1945     if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1946         goto out;
1947 
1948     down_write(&EXT4_I(inode)->i_data_sem);
1949     i_size = inode->i_size;
1950     inline_size = ext4_get_inline_size(inode);
1951     EXT4_I(inode)->i_disksize = i_size;
1952 
1953     if (i_size < inline_size) {
1954         /*
1955          * if there's inline data to truncate and this file was
1956          * converted to extents after that inline data was written,
1957          * the extent status cache must be cleared to avoid leaving
1958          * behind stale delayed allocated extent entries
1959          */
1960         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1961 retry:
1962             err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1963             if (err == -ENOMEM) {
1964                 memalloc_retry_wait(GFP_ATOMIC);
1965                 goto retry;
1966             }
1967             if (err)
1968                 goto out_error;
1969         }
1970 
1971         /* Clear the content in the xattr space. */
1972         if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1973             if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1974                 goto out_error;
1975 
1976             BUG_ON(is.s.not_found);
1977 
1978             value_len = le32_to_cpu(is.s.here->e_value_size);
1979             value = kmalloc(value_len, GFP_NOFS);
1980             if (!value) {
1981                 err = -ENOMEM;
1982                 goto out_error;
1983             }
1984 
1985             err = ext4_xattr_ibody_get(inode, i.name_index,
1986                            i.name, value, value_len);
1987             if (err <= 0)
1988                 goto out_error;
1989 
1990             i.value = value;
1991             i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1992                     i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1993             err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1994             if (err)
1995                 goto out_error;
1996         }
1997 
1998         /* Clear the content within i_blocks. */
1999         if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
2000             void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
2001             memset(p + i_size, 0,
2002                    EXT4_MIN_INLINE_DATA_SIZE - i_size);
2003         }
2004 
2005         EXT4_I(inode)->i_inline_size = i_size <
2006                     EXT4_MIN_INLINE_DATA_SIZE ?
2007                     EXT4_MIN_INLINE_DATA_SIZE : i_size;
2008     }
2009 
2010 out_error:
2011     up_write(&EXT4_I(inode)->i_data_sem);
2012 out:
2013     brelse(is.iloc.bh);
2014     ext4_write_unlock_xattr(inode, &no_expand);
2015     kfree(value);
2016     if (inode->i_nlink)
2017         ext4_orphan_del(handle, inode);
2018 
2019     if (err == 0) {
2020         inode->i_mtime = inode->i_ctime = current_time(inode);
2021         err = ext4_mark_inode_dirty(handle, inode);
2022         if (IS_SYNC(inode))
2023             ext4_handle_sync(handle);
2024     }
2025     ext4_journal_stop(handle);
2026     return err;
2027 }
2028 
2029 int ext4_convert_inline_data(struct inode *inode)
2030 {
2031     int error, needed_blocks, no_expand;
2032     handle_t *handle;
2033     struct ext4_iloc iloc;
2034 
2035     if (!ext4_has_inline_data(inode)) {
2036         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2037         return 0;
2038     } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2039         /*
2040          * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2041          * cleared. This means we are in the middle of moving of
2042          * inline data to delay allocated block. Just force writeout
2043          * here to finish conversion.
2044          */
2045         error = filemap_flush(inode->i_mapping);
2046         if (error)
2047             return error;
2048         if (!ext4_has_inline_data(inode))
2049             return 0;
2050     }
2051 
2052     needed_blocks = ext4_writepage_trans_blocks(inode);
2053 
2054     iloc.bh = NULL;
2055     error = ext4_get_inode_loc(inode, &iloc);
2056     if (error)
2057         return error;
2058 
2059     handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2060     if (IS_ERR(handle)) {
2061         error = PTR_ERR(handle);
2062         goto out_free;
2063     }
2064 
2065     ext4_write_lock_xattr(inode, &no_expand);
2066     if (ext4_has_inline_data(inode))
2067         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2068     ext4_write_unlock_xattr(inode, &no_expand);
2069     ext4_journal_stop(handle);
2070 out_free:
2071     brelse(iloc.bh);
2072     return error;
2073 }
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