On 03/13/2012 10:29 PM, J. Bruce Fields wrote: > On Tue, Mar 13, 2012 at 10:09:05PM +0100, Bernd Schubert wrote: >> Hmm, there must have gone something wrong on merging, > > In that case one approach would be to rebase your last-sent patches on > to the same base as Ted's versions, confirm that one still works and the > other doesn't, and do a diff.... > >> my own test >> also fails >> >> http://www.pci.uni-heidelberg.de/tc/usr/bernd/downloads/test_seekdir/ >> >> (Sorry, it does not say 'failure', but one needs to compare the file >> names and telldir-offset numbers) >> >> I think I will continue in the morning as its already 1 a.m. here. > > OK, thanks for following up! Took me some time to figure out what is going on and in the end I previously forgot another test case - I always tested directories being sufficiently large, so that they got the EXT4_INODE_INDEX flag. However, the cython tests failed on a small directory, which doesn't have that flag. But then ext4_readdir() always uses the dx version, I guess in order to always return the same offset values (in the sense of converting a non-dx dir to dx). In ext4_dir_llseek() I only tested for the EXT4_INODE_INDEX flag, which is not correct in any case. So here is the patch, shall I sent an updated version of the previous ext4 patch or is this patch sufficient? Signed-off-by: Bernd Schubert <bernd.schubert@xxxxxxxxxxxxxxxxxx> diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c index 71a66ff..6a19a35 100644 --- a/fs/ext4/dir.c +++ b/fs/ext4/dir.c @@ -44,6 +44,24 @@ static unsigned char get_dtype(struct super_block *sb, int filetype) return (ext4_filetype_table[filetype]); } +/** + * Check if the given dir-inode refers to an htree indexed directory + * + * Return 1 if it is a dx dir, 0 if not + */ +static int is_dx_dir(struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + + if (EXT4_HAS_COMPAT_FEATURE(inode->i_sb, + EXT4_FEATURE_COMPAT_DIR_INDEX) && + ((ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) || + ((inode->i_size >> sb->s_blocksize_bits) == 1))) + return 1; + + return 0; +} + /* * Return 0 if the directory entry is OK, and 1 if there is a problem * @@ -99,18 +117,13 @@ static int ext4_readdir(struct file *filp, unsigned int offset; int i, stored; struct ext4_dir_entry_2 *de; - struct super_block *sb; int err; struct inode *inode = filp->f_path.dentry->d_inode; + struct super_block *sb = inode->i_sb; int ret = 0; int dir_has_error = 0; - sb = inode->i_sb; - - if (EXT4_HAS_COMPAT_FEATURE(inode->i_sb, - EXT4_FEATURE_COMPAT_DIR_INDEX) && - ((ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) || - ((inode->i_size >> sb->s_blocksize_bits) == 1))) { + if (is_dx_dir(inode)) { err = ext4_dx_readdir(filp, dirent, filldir); if (err != ERR_BAD_DX_DIR) { ret = err; @@ -308,7 +321,7 @@ loff_t ext4_dir_llseek(struct file *file, loff_t offset, int origin) { struct inode *inode = file->f_mapping->host; loff_t ret = -EINVAL; - int is_dx_dir = ext4_test_inode_flag(inode, EXT4_INODE_INDEX); + int dx_dir = is_dx_dir(inode); mutex_lock(&inode->i_mutex); @@ -323,7 +336,7 @@ loff_t ext4_dir_llseek(struct file *file, loff_t offset, int origin) /* so only negative offsets are left, does that have a * meaning for directories at all? */ - if (is_dx_dir) + if (dx_dir) offset += ext4_get_htree_eof(file); else offset += inode->i_size; @@ -347,7 +360,7 @@ loff_t ext4_dir_llseek(struct file *file, loff_t offset, int origin) if (unlikely(offset < 0)) goto out_err; - if (!is_dx_dir) { + if (!dx_dir) { if (offset > inode->i_sb->s_maxbytes) goto out_err; } else if (offset > ext4_get_htree_eof(file)) -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
