Messages in this thread | | | Date | Sun, 18 May 2008 17:36:02 +0200 | From | Bernie Innocenti <> | Subject | ext3_dx_add_entry: Directory index full! |
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On 2.6.24.4-64.fc8, I createed and mounted a filesystem like this:
mke2fs -m0 -b 1024 -R stride=64 -I 128 -i 2048 -j -L mail -O dir_index,sparse_super -v /dev/sdc1 mount -t ext3 -o noatime,data=writeback,nosuid,usrquota /dev/sdc1 /mail
Then I copied a directory with 200K small files into it:
cp -a home/simone/Maildir/YouHaveJunkSir /mail/ [...] cp: cannot create regular file `/mnt/YouHaveJunkSir/1174170042.20731_2.trinity.develer.com:2,b': No space left on device cp: cannot create regular file `/mnt/YouHaveJunkSir/1186341042.8337_2.trinity.develer.com:2,': No space left on device cp: cannot create regular file `/mnt/YouHaveJunkSir/1209101786.3888_2.trinity.develer.com:2,': No space left on device
The kernel logs are also scary:
EXT3-fs warning (device sdc1): ext3_dx_add_entry: Directory index full! EXT3-fs warning (device sdc1): ext3_dx_add_entry: Directory index full! [...]
The failing check looks like this:
if (levels && (dx_get_count(frames->entries) == dx_get_limit(frames->entries))) { ext3_warning(sb, __FUNCTION__, "Directory index full!"); err = -ENOSPC; goto cleanup; }
The limit is set in make_indexed_dir():
dx_set_limit (entries, dx_root_limit(dir, sizeof(root->info)));
with this helper function:
static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize) { unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(1) - EXT3_DIR_REC_LEN(2) - infosize; return 0? 20: entry_space / sizeof(struct dx_entry); }
Am I reading the above code correctly? Why does it always return 20 no matter what?
Some background: I'm moving users' Maildirs to a separate filesystem tuned for small files to increase performance. One of our users intentionally collected spam for 5 years in one folder and likes it this way. We could easily work it around, but first I'd like to understand whether the particular parameters we used trigger a bug in ext3 or if we're just hitting a (possibly undocumented) limit.
-- \___/ _| X | Bernie Innocenti - http://www.codewiz.org/ \|_O_| "It's an education project, not a laptop project!"
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