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fs/ntfs3: Refactoring attr_insert_range to restore after errors 

Added done and undo labels for restoring after errors

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2022-07-13 18:44:24 +03:00
parent 20abc64f78
commit 9256ec3535
No known key found for this signature in database
GPG Key ID: A9B0331F832407B6
1 changed files with 87 additions and 32 deletions
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119
fs/ntfs3/attrib.c
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@ -2275,30 +2275,29 @@ int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
if (!attr_b->non_res) {
err = attr_set_size(ni, ATTR_DATA, NULL, 0, run,
data_size + bytes, NULL, false, &attr);
if (err)
goto out;
if (!attr->non_res) {
/* Still resident. */
char *data = Add2Ptr(attr, attr->res.data_off);
data_size + bytes, NULL, false, NULL);
memmove(data + bytes, data, bytes);
memset(data, 0, bytes);
err = 0;
goto out;
}
/* Resident files becomes nonresident. */
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL,
&mi_b);
if (!attr_b) {
err = -ENOENT;
goto out;
}
if (!attr_b->non_res) {
err = -EINVAL;
goto out;
goto bad_inode;
}
if (err)
goto out;
if (!attr_b->non_res) {
/* Still resident. */
char *data = Add2Ptr(attr_b, attr_b->res.data_off);
memmove(data + bytes, data, bytes);
memset(data, 0, bytes);
goto done;
}
/* Resident files becomes nonresident. */
data_size = le64_to_cpu(attr_b->nres.data_size);
alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
}
@ -2316,14 +2315,14 @@ int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
mi = mi_b;
} else if (!le_b) {
err = -EINVAL;
goto out;
goto bad_inode;
} else {
le = le_b;
attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
&mi);
if (!attr) {
err = -EINVAL;
goto out;
goto bad_inode;
}
svcn = le64_to_cpu(attr->nres.svcn);
@ -2346,7 +2345,6 @@ int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
goto out;
next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
run_truncate_head(run, next_svcn);
while ((attr = ni_enum_attr_ex(ni, attr, &le, &mi)) &&
attr->type == ATTR_DATA && !attr->name_len) {
@ -2359,9 +2357,27 @@ int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
mi->dirty = true;
}
if (next_svcn < evcn1 + len) {
err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
next_svcn, evcn1 + len - next_svcn,
a_flags, NULL, NULL, NULL);
le_b = NULL;
attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL,
&mi_b);
if (!attr_b) {
err = -EINVAL;
goto bad_inode;
}
if (err) {
/* ni_insert_nonresident failed. Try to undo. */
goto undo_insert_range;
}
}
/*
* Update primary attribute segment in advance.
* pointer attr_b may become invalid (layout of mft is changed)
* Update primary attribute segment.
*/
if (vbo <= ni->i_valid)
ni->i_valid += bytes;
@ -2376,14 +2392,7 @@ int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
attr_b->nres.valid_size = cpu_to_le64(ni->i_valid);
mi_b->dirty = true;
if (next_svcn < evcn1 + len) {
err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
next_svcn, evcn1 + len - next_svcn,
a_flags, NULL, NULL, NULL);
if (err)
goto out;
}
done:
ni->vfs_inode.i_size += bytes;
ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
mark_inode_dirty(&ni->vfs_inode);
@ -2392,8 +2401,54 @@ out:
run_truncate(run, 0); /* clear cached values. */
up_write(&ni->file.run_lock);
if (err)
_ntfs_bad_inode(&ni->vfs_inode);
return err;
bad_inode:
_ntfs_bad_inode(&ni->vfs_inode);
goto out;
undo_insert_range:
svcn = le64_to_cpu(attr_b->nres.svcn);
evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
if (svcn <= vcn && vcn < evcn1) {
attr = attr_b;
le = le_b;
mi = mi_b;
} else if (!le_b) {
goto bad_inode;
} else {
le = le_b;
attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
&mi);
if (!attr) {
goto bad_inode;
}
svcn = le64_to_cpu(attr->nres.svcn);
evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
}
if (attr_load_runs(attr, ni, run, NULL))
goto bad_inode;
if (!run_collapse_range(run, vcn, len))
goto bad_inode;
if (mi_pack_runs(mi, attr, run, evcn1 + len - svcn))
goto bad_inode;
while ((attr = ni_enum_attr_ex(ni, attr, &le, &mi)) &&
attr->type == ATTR_DATA && !attr->name_len) {
le64_sub_cpu(&attr->nres.svcn, len);
le64_sub_cpu(&attr->nres.evcn, len);
if (le) {
le->vcn = attr->nres.svcn;
ni->attr_list.dirty = true;
}
mi->dirty = true;
}
goto out;
}