6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jan Kara <jack@xxxxxxx>
[ Upstream commit 7cd7a36ab44d3e8c1dee7185ef407b9831a8220b ]
Convert udf_readdir() to new directory iteration functions.
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/udf/dir.c | 148 ++++++++++-------------------------------------------------
1 file changed, 27 insertions(+), 121 deletions(-)
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -39,26 +39,13 @@
static int udf_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *dir = file_inode(file);
- struct udf_inode_info *iinfo = UDF_I(dir);
- struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
- struct fileIdentDesc *fi = NULL;
- struct fileIdentDesc cfi;
- udf_pblk_t block, iblock;
loff_t nf_pos, emit_pos = 0;
int flen;
- unsigned char *fname = NULL, *copy_name = NULL;
- unsigned char *nameptr;
- uint16_t liu;
- uint8_t lfi;
- loff_t size = udf_ext0_offset(dir) + dir->i_size;
- struct buffer_head *tmp, *bha[16];
- struct kernel_lb_addr eloc;
- uint32_t elen;
- sector_t offset;
- int i, num, ret = 0;
- struct extent_position epos = { NULL, 0, {0, 0} };
+ unsigned char *fname = NULL;
+ int ret = 0;
struct super_block *sb = dir->i_sb;
bool pos_valid = false;
+ struct udf_fileident_iter iter;
if (ctx->pos == 0) {
if (!dir_emit_dot(file, ctx))
@@ -66,7 +53,7 @@ static int udf_readdir(struct file *file
ctx->pos = 1;
}
nf_pos = (ctx->pos - 1) << 2;
- if (nf_pos >= size)
+ if (nf_pos >= dir->i_size)
goto out;
/*
@@ -90,138 +77,57 @@ static int udf_readdir(struct file *file
goto out;
}
- if (nf_pos == 0)
- nf_pos = udf_ext0_offset(dir);
-
- fibh.soffset = fibh.eoffset = nf_pos & (sb->s_blocksize - 1);
- if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
- if (inode_bmap(dir, nf_pos >> sb->s_blocksize_bits,
- &epos, &eloc, &elen, &offset)
- != (EXT_RECORDED_ALLOCATED >> 30)) {
- ret = -ENOENT;
- goto out;
- }
- block = udf_get_lb_pblock(sb, &eloc, offset);
- if ((++offset << sb->s_blocksize_bits) < elen) {
- if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
- epos.offset -= sizeof(struct short_ad);
- else if (iinfo->i_alloc_type ==
- ICBTAG_FLAG_AD_LONG)
- epos.offset -= sizeof(struct long_ad);
- } else {
- offset = 0;
- }
-
- if (!(fibh.sbh = fibh.ebh = udf_tread(sb, block))) {
- ret = -EIO;
- goto out;
- }
-
- if (!(offset & ((16 >> (sb->s_blocksize_bits - 9)) - 1))) {
- i = 16 >> (sb->s_blocksize_bits - 9);
- if (i + offset > (elen >> sb->s_blocksize_bits))
- i = (elen >> sb->s_blocksize_bits) - offset;
- for (num = 0; i > 0; i--) {
- block = udf_get_lb_pblock(sb, &eloc, offset + i);
- tmp = udf_tgetblk(sb, block);
- if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
- bha[num++] = tmp;
- else
- brelse(tmp);
- }
- if (num) {
- bh_readahead_batch(num, bha, REQ_RAHEAD);
- for (i = 0; i < num; i++)
- brelse(bha[i]);
- }
- }
- }
-
- while (nf_pos < size) {
+ for (ret = udf_fiiter_init(&iter, dir, nf_pos);
+ !ret && iter.pos < dir->i_size;
+ ret = udf_fiiter_advance(&iter)) {
struct kernel_lb_addr tloc;
- loff_t cur_pos = nf_pos;
-
- /* Update file position only if we got past the current one */
- if (nf_pos >= emit_pos) {
- ctx->pos = (nf_pos >> 2) + 1;
- pos_valid = true;
- }
+ udf_pblk_t iblock;
- fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
- &elen, &offset);
- if (!fi)
- goto out;
/* Still not at offset where user asked us to read from? */
- if (cur_pos < emit_pos)
+ if (iter.pos < emit_pos)
continue;
- liu = le16_to_cpu(cfi.lengthOfImpUse);
- lfi = cfi.lengthFileIdent;
-
- if (fibh.sbh == fibh.ebh) {
- nameptr = udf_get_fi_ident(fi);
- } else {
- int poffset; /* Unpaded ending offset */
-
- poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
-
- if (poffset >= lfi) {
- nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
- } else {
- if (!copy_name) {
- copy_name = kmalloc(UDF_NAME_LEN,
- GFP_NOFS);
- if (!copy_name) {
- ret = -ENOMEM;
- goto out;
- }
- }
- nameptr = copy_name;
- memcpy(nameptr, udf_get_fi_ident(fi),
- lfi - poffset);
- memcpy(nameptr + lfi - poffset,
- fibh.ebh->b_data, poffset);
- }
- }
+ /* Update file position only if we got past the current one */
+ pos_valid = true;
+ ctx->pos = (iter.pos >> 2) + 1;
- if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
+ if (iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
continue;
}
- if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
+ if (iter.fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) {
if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
continue;
}
- if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
+ if (iter.fi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
if (!dir_emit_dotdot(file, ctx))
- goto out;
+ goto out_iter;
continue;
}
- flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
+ flen = udf_get_filename(sb, iter.name,
+ iter.fi.lengthFileIdent, fname, UDF_NAME_LEN);
if (flen < 0)
continue;
- tloc = lelb_to_cpu(cfi.icb.extLocation);
+ tloc = lelb_to_cpu(iter.fi.icb.extLocation);
iblock = udf_get_lb_pblock(sb, &tloc, 0);
if (!dir_emit(ctx, fname, flen, iblock, DT_UNKNOWN))
- goto out;
- } /* end while */
-
- ctx->pos = (nf_pos >> 2) + 1;
- pos_valid = true;
+ goto out_iter;
+ }
+ if (!ret) {
+ ctx->pos = (iter.pos >> 2) + 1;
+ pos_valid = true;
+ }
+out_iter:
+ udf_fiiter_release(&iter);
out:
if (pos_valid)
file->f_version = inode_query_iversion(dir);
- if (fibh.sbh != fibh.ebh)
- brelse(fibh.ebh);
- brelse(fibh.sbh);
- brelse(epos.bh);
kfree(fname);
- kfree(copy_name);
return ret;
}
