From 530f1a5e3e93a038a457faf716975ed19f82831d Mon Sep 17 00:00:00 2001 From: Marcin Slusarz Date: Sun, 16 Nov 2008 19:02:45 +0100 Subject: udf: reduce stack usage of udf_get_filename Allocate strings with kmalloc. Checkstack output: Before: udf_get_filename: 600 After: udf_get_filename: 136 Signed-off-by: Marcin Slusarz Cc: Jan Kara Signed-off-by: Jan Kara --- fs/udf/unicode.c | 41 +++++++++++++++++++++++++---------------- 1 file changed, 25 insertions(+), 16 deletions(-) (limited to 'fs/udf/unicode.c') diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c index 9fdf8c93c58e..a3bbdbde9f4b 100644 --- a/fs/udf/unicode.c +++ b/fs/udf/unicode.c @@ -324,34 +324,43 @@ try_again: int udf_get_filename(struct super_block *sb, uint8_t *sname, uint8_t *dname, int flen) { - struct ustr filename, unifilename; - int len; + struct ustr *filename, *unifilename; + int len = 0; - if (udf_build_ustr_exact(&unifilename, sname, flen)) + filename = kmalloc(sizeof(struct ustr), GFP_NOFS); + if (!filename) return 0; + unifilename = kmalloc(sizeof(struct ustr), GFP_NOFS); + if (!unifilename) + goto out1; + + if (udf_build_ustr_exact(unifilename, sname, flen)) + goto out2; + if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) { - if (!udf_CS0toUTF8(&filename, &unifilename)) { + if (!udf_CS0toUTF8(filename, unifilename)) { udf_debug("Failed in udf_get_filename: sname = %s\n", sname); - return 0; + goto out2; } } else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) { - if (!udf_CS0toNLS(UDF_SB(sb)->s_nls_map, &filename, - &unifilename)) { + if (!udf_CS0toNLS(UDF_SB(sb)->s_nls_map, filename, + unifilename)) { udf_debug("Failed in udf_get_filename: sname = %s\n", sname); - return 0; + goto out2; } } else - return 0; - - len = udf_translate_to_linux(dname, filename.u_name, filename.u_len, - unifilename.u_name, unifilename.u_len); - if (len) - return len; - - return 0; + goto out2; + + len = udf_translate_to_linux(dname, filename->u_name, filename->u_len, + unifilename->u_name, unifilename->u_len); +out2: + kfree(unifilename); +out1: + kfree(filename); + return len; } int udf_put_filename(struct super_block *sb, const uint8_t *sname, -- cgit v1.2.3