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udf: reduce stack usage of udf_load_pvoldesc 

Allocate strings with kmalloc.

Checkstack output:
Before: udf_process_sequence:      712
After:  udf_process_sequence:      200

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Marcin Slusarz 2008-11-16 19:01:44 +01:00 committed by Jan Kara
parent 97e961fdbf
commit ba9aadd80c
1 changed files with 25 additions and 11 deletions
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36
fs/udf/super.c
View File

@ -902,14 +902,23 @@ static int udf_find_fileset(struct super_block *sb,
static int udf_load_pvoldesc(struct super_block *sb, sector_t block) static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
{ {
struct primaryVolDesc *pvoldesc; struct primaryVolDesc *pvoldesc;
struct ustr instr; struct ustr *instr, *outstr;
struct ustr outstr;
struct buffer_head *bh; struct buffer_head *bh;
uint16_t ident; uint16_t ident;
int ret = 1;
instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
if (!instr)
return 1;
outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
if (!outstr)
goto out1;
bh = udf_read_tagged(sb, block, block, &ident); bh = udf_read_tagged(sb, block, block, &ident);
if (!bh) if (!bh)
return 1; goto out2;
BUG_ON(ident != TAG_IDENT_PVD); BUG_ON(ident != TAG_IDENT_PVD);
pvoldesc = (struct primaryVolDesc *)bh->b_data; pvoldesc = (struct primaryVolDesc *)bh->b_data;
@ -925,20 +934,25 @@ static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
#endif #endif
} }
if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
if (udf_CS0toUTF8(&outstr, &instr)) { if (udf_CS0toUTF8(outstr, instr)) {
strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name, strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
outstr.u_len > 31 ? 31 : outstr.u_len); outstr->u_len > 31 ? 31 : outstr->u_len);
udf_debug("volIdent[] = '%s'\n", udf_debug("volIdent[] = '%s'\n",
UDF_SB(sb)->s_volume_ident); UDF_SB(sb)->s_volume_ident);
} }
if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
if (udf_CS0toUTF8(&outstr, &instr)) if (udf_CS0toUTF8(outstr, instr))
udf_debug("volSetIdent[] = '%s'\n", outstr.u_name); udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
brelse(bh); brelse(bh);
return 0; ret = 0;
out2:
kfree(outstr);
out1:
kfree(instr);
return ret;
} }
static int udf_load_metadata_files(struct super_block *sb, int partition) static int udf_load_metadata_files(struct super_block *sb, int partition)