forked from Minki/linux
225add6196
I saw an oops down this path when trying to create a new file on a UDF
filesystem which was internally marked as readonly, but mounted rw:
udf_create
udf_new_inode
new_inode
alloc_inode
udf_alloc_inode
udf_new_block
returns EIO due to readonlyness
iput (on error)
udf_put_inode
udf_discard_prealloc
udf_next_aext
udf_current_aext
udf_get_fileshortad
OOPS
the udf_discard_prealloc() path was examining uninitialized fields of the
udf inode.
udf_discard_prealloc() already has this code to short-circuit the discard
path if no extents are preallocated:
if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB ||
inode->i_size == UDF_I_LENEXTENTS(inode))
{
return;
}
so if we initialize UDF_I_LENEXTENTS(inode) = 0 earlier in udf_new_inode,
we won't try to free the (not) preallocated blocks, since this will match
the i_size = 0 set when the inode was initialized.
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
167 lines
4.3 KiB
C
167 lines
4.3 KiB
C
/*
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* ialloc.c
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*
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* PURPOSE
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* Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*
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* (C) 1998-2001 Ben Fennema
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*
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* HISTORY
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*
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* 02/24/99 blf Created.
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*
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*/
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#include "udfdecl.h"
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#include <linux/fs.h>
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#include <linux/quotaops.h>
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#include <linux/udf_fs.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include "udf_i.h"
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#include "udf_sb.h"
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void udf_free_inode(struct inode * inode)
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{
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struct super_block *sb = inode->i_sb;
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struct udf_sb_info *sbi = UDF_SB(sb);
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/*
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* Note: we must free any quota before locking the superblock,
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* as writing the quota to disk may need the lock as well.
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*/
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DQUOT_FREE_INODE(inode);
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DQUOT_DROP(inode);
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clear_inode(inode);
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mutex_lock(&sbi->s_alloc_mutex);
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if (sbi->s_lvidbh) {
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if (S_ISDIR(inode->i_mode))
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UDF_SB_LVIDIU(sb)->numDirs =
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cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) - 1);
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else
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UDF_SB_LVIDIU(sb)->numFiles =
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cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) - 1);
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mark_buffer_dirty(sbi->s_lvidbh);
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}
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mutex_unlock(&sbi->s_alloc_mutex);
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udf_free_blocks(sb, NULL, UDF_I_LOCATION(inode), 0, 1);
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}
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struct inode * udf_new_inode (struct inode *dir, int mode, int * err)
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{
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struct super_block *sb = dir->i_sb;
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struct udf_sb_info *sbi = UDF_SB(sb);
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struct inode * inode;
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int block;
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uint32_t start = UDF_I_LOCATION(dir).logicalBlockNum;
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inode = new_inode(sb);
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if (!inode)
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{
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*err = -ENOMEM;
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return NULL;
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}
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*err = -ENOSPC;
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UDF_I_UNIQUE(inode) = 0;
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UDF_I_LENEXTENTS(inode) = 0;
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UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
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UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
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UDF_I_STRAT4096(inode) = 0;
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block = udf_new_block(dir->i_sb, NULL, UDF_I_LOCATION(dir).partitionReferenceNum,
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start, err);
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if (*err)
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{
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iput(inode);
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return NULL;
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}
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mutex_lock(&sbi->s_alloc_mutex);
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if (UDF_SB_LVIDBH(sb))
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{
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struct logicalVolHeaderDesc *lvhd;
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uint64_t uniqueID;
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lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(sb)->logicalVolContentsUse);
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if (S_ISDIR(mode))
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UDF_SB_LVIDIU(sb)->numDirs =
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cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs) + 1);
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else
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UDF_SB_LVIDIU(sb)->numFiles =
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cpu_to_le32(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) + 1);
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UDF_I_UNIQUE(inode) = uniqueID = le64_to_cpu(lvhd->uniqueID);
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if (!(++uniqueID & 0x00000000FFFFFFFFUL))
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uniqueID += 16;
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lvhd->uniqueID = cpu_to_le64(uniqueID);
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mark_buffer_dirty(UDF_SB_LVIDBH(sb));
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}
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inode->i_mode = mode;
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inode->i_uid = current->fsuid;
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if (dir->i_mode & S_ISGID)
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{
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inode->i_gid = dir->i_gid;
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if (S_ISDIR(mode))
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mode |= S_ISGID;
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}
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else
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inode->i_gid = current->fsgid;
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UDF_I_LOCATION(inode).logicalBlockNum = block;
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UDF_I_LOCATION(inode).partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
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inode->i_ino = udf_get_lb_pblock(sb, UDF_I_LOCATION(inode), 0);
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inode->i_blksize = PAGE_SIZE;
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inode->i_blocks = 0;
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UDF_I_LENEATTR(inode) = 0;
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UDF_I_LENALLOC(inode) = 0;
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UDF_I_USE(inode) = 0;
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if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE))
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{
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UDF_I_EFE(inode) = 1;
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UDF_UPDATE_UDFREV(inode->i_sb, UDF_VERS_USE_EXTENDED_FE);
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UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
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memset(UDF_I_DATA(inode), 0x00, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
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}
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else
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{
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UDF_I_EFE(inode) = 0;
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UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
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memset(UDF_I_DATA(inode), 0x00, inode->i_sb->s_blocksize - sizeof(struct fileEntry));
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}
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if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
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UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
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else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
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UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
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else
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UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
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inode->i_mtime = inode->i_atime = inode->i_ctime =
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UDF_I_CRTIME(inode) = current_fs_time(inode->i_sb);
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insert_inode_hash(inode);
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mark_inode_dirty(inode);
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mutex_unlock(&sbi->s_alloc_mutex);
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if (DQUOT_ALLOC_INODE(inode))
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{
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DQUOT_DROP(inode);
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inode->i_flags |= S_NOQUOTA;
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inode->i_nlink = 0;
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iput(inode);
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*err = -EDQUOT;
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return NULL;
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}
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*err = 0;
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return inode;
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}
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