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eCryptfs: remove header_extent_size

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There is no point to keeping a separate header_extent_size and an extent_size.
 The total size of the header can always be represented as some multiple of
the regular data extent size.

[randy.dunlap@oracle.com: ecryptfs: fix printk format warning]
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Halcrow
2007-10-16 01:28:05 -07:00
committed by Linus Torvalds
parent e9f6a99cb8
commit 45eaab7967
4 changed files with 52 additions and 36 deletions
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40
fs/ecryptfs/crypto.c
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@@ -366,8 +366,8 @@ ecryptfs_extent_to_lwr_pg_idx_and_offset(unsigned long *lower_page_idx,
int extents_per_page;
bytes_occupied_by_headers_at_front =
( crypt_stat->header_extent_size
* crypt_stat->num_header_extents_at_front );
(crypt_stat->extent_size
* crypt_stat->num_header_extents_at_front);
extents_occupied_by_headers_at_front =
( bytes_occupied_by_headers_at_front
/ crypt_stat->extent_size );
@@ -376,8 +376,8 @@ ecryptfs_extent_to_lwr_pg_idx_and_offset(unsigned long *lower_page_idx,
(*lower_page_idx) = lower_extent_num / extents_per_page;
extent_offset = lower_extent_num % extents_per_page;
(*byte_offset) = extent_offset * crypt_stat->extent_size;
ecryptfs_printk(KERN_DEBUG, " * crypt_stat->header_extent_size = "
"[%d]\n", crypt_stat->header_extent_size);
ecryptfs_printk(KERN_DEBUG, " * crypt_stat->extent_size = "
"[%d]\n", crypt_stat->extent_size);
ecryptfs_printk(KERN_DEBUG, " * crypt_stat->"
"num_header_extents_at_front = [%d]\n",
crypt_stat->num_header_extents_at_front);
@@ -899,15 +899,17 @@ void ecryptfs_set_default_sizes(struct ecryptfs_crypt_stat *crypt_stat)
crypt_stat->extent_size = ECRYPTFS_DEFAULT_EXTENT_SIZE;
set_extent_mask_and_shift(crypt_stat);
crypt_stat->iv_bytes = ECRYPTFS_DEFAULT_IV_BYTES;
if (PAGE_CACHE_SIZE <= ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE) {
crypt_stat->header_extent_size =
ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE;
} else
crypt_stat->header_extent_size = PAGE_CACHE_SIZE;
if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
crypt_stat->num_header_extents_at_front = 0;
else
crypt_stat->num_header_extents_at_front = 1;
else {
if (PAGE_CACHE_SIZE <= ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE)
crypt_stat->num_header_extents_at_front =
(ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE
/ crypt_stat->extent_size);
else
crypt_stat->num_header_extents_at_front =
(PAGE_CACHE_SIZE / crypt_stat->extent_size);
}
}
/**
@@ -1319,7 +1321,7 @@ ecryptfs_write_header_metadata(char *virt,
u32 header_extent_size;
u16 num_header_extents_at_front;
header_extent_size = (u32)crypt_stat->header_extent_size;
header_extent_size = (u32)crypt_stat->extent_size;
num_header_extents_at_front =
(u16)crypt_stat->num_header_extents_at_front;
header_extent_size = cpu_to_be32(header_extent_size);
@@ -1415,7 +1417,7 @@ ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt_stat,
set_fs(oldfs);
goto out;
}
header_pages = ((crypt_stat->header_extent_size
header_pages = ((crypt_stat->extent_size
* crypt_stat->num_header_extents_at_front)
/ PAGE_CACHE_SIZE);
memset(page_virt, 0, PAGE_CACHE_SIZE);
@@ -1532,17 +1534,16 @@ static int parse_header_metadata(struct ecryptfs_crypt_stat *crypt_stat,
virt += 4;
memcpy(&num_header_extents_at_front, virt, 2);
num_header_extents_at_front = be16_to_cpu(num_header_extents_at_front);
crypt_stat->header_extent_size = (int)header_extent_size;
crypt_stat->num_header_extents_at_front =
(int)num_header_extents_at_front;
(*bytes_read) = 6;
(*bytes_read) = (sizeof(u32) + sizeof(u16));
if ((validate_header_size == ECRYPTFS_VALIDATE_HEADER_SIZE)
&& ((crypt_stat->header_extent_size
&& ((crypt_stat->extent_size
* crypt_stat->num_header_extents_at_front)
< ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE)) {
rc = -EINVAL;
ecryptfs_printk(KERN_WARNING, "Invalid header extent size: "
"[%d]\n", crypt_stat->header_extent_size);
printk(KERN_WARNING "Invalid number of header extents: [%zd]\n",
crypt_stat->num_header_extents_at_front);
}
return rc;
}
@@ -1557,8 +1558,7 @@ static int parse_header_metadata(struct ecryptfs_crypt_stat *crypt_stat,
*/
static void set_default_header_data(struct ecryptfs_crypt_stat *crypt_stat)
{
crypt_stat->header_extent_size = 4096;
crypt_stat->num_header_extents_at_front = 1;
crypt_stat->num_header_extents_at_front = 2;
}
/**