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corrected the support for dir_nlink

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Bo Branten
2024-09-21 21:29:35 +02:00
parent 6d1ac271e5
commit d559017175
1 changed files with 20 additions and 1 deletions
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21
Ext4Fsd/ext3/htree.c
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@@ -304,14 +304,33 @@ struct buffer_head *ext3_append(struct ext2_icb *icb, struct inode *inode,
return ext3_bread(icb, inode, *block, err); return ext3_bread(icb, inode, *block, err);
} }
/*
* Set directory link count to 1 if nlinks > EXT4_LINK_MAX, or if nlinks == 2
* since this indicates that nlinks count was previously 1 to avoid overflowing
* the 16-bit i_links_count field on disk. Directories with i_nlink == 1 mean
* that subdirectory link counts are not being maintained accurately.
*
* The caller has already checked for i_nlink overflow in case the DIR_LINK
* feature is not enabled and returned -EMLINK. The is_dx() check is a proxy
* for checking S_ISDIR(inode) (since the INODE_INDEX feature will not be set
* on regular files) and to avoid creating huge/slow non-HTREE directories.
*/
void ext3_inc_count(struct inode *inode) void ext3_inc_count(struct inode *inode)
{ {
inode->i_nlink++; inode->i_nlink++;
if (is_dx(inode) &&
(inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2))
inode->i_nlink = 1;
} }
/*
* If a directory had nlink == 1, then we should let it be 1. This indicates
* directory has >EXT4_LINK_MAX subdirs.
*/
void ext3_dec_count(struct inode *inode) void ext3_dec_count(struct inode *inode)
{ {
inode->i_nlink--; if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
inode->i_nlink--;
} }
unsigned char ext3_type_by_mode(umode_t mode) unsigned char ext3_type_by_mode(umode_t mode)