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reiserfs: Protect reiserfs_quota_on() with write lock
In reiserfs_quota_on() we do quite some work - for example unpacking tail of a quota file. Thus we have to hold write lock until a moment we call back into the quota code. CC: stable@vger.kernel.org # >= 3.0 Signed-off-by: Jan Kara <jack@suse.cz>
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parent
3bb3e1fc47
commit
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@ -2216,8 +2216,11 @@ static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
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struct reiserfs_transaction_handle th;
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struct reiserfs_transaction_handle th;
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int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
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int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
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if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt)))
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reiserfs_write_lock(sb);
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return -EINVAL;
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if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
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err = -EINVAL;
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goto out;
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}
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/* Quotafile not on the same filesystem? */
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/* Quotafile not on the same filesystem? */
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if (path->dentry->d_sb != sb) {
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if (path->dentry->d_sb != sb) {
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@ -2259,8 +2262,10 @@ static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
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if (err)
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if (err)
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goto out;
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goto out;
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}
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}
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err = dquot_quota_on(sb, type, format_id, path);
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reiserfs_write_unlock(sb);
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return dquot_quota_on(sb, type, format_id, path);
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out:
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out:
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reiserfs_write_unlock(sb);
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return err;
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return err;
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}
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}
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