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